bluuebunny/crossref_metadata_2025 huggingface dataset:
The status of KAGRA underground cryogenic gravitational wave telescope
Authors: Akutsu T. , Ando M. , Araya A. , Aritomi N. , Asada H. , Aso Y. , Atsuta S. , Awai K. , Barton M. A. , Cannon K. , Craig K. , Creus W. , Doi K. , Eda K. , Enomoto Y. , Flaminio R. , Fujii Y. , Fujimoto M.-K. , Furuhata T. , Haino S. , Hasegawa K. , Hashino K. , Hayama K. , Hirobayashi S. , Hirose E. , Hsieh A. H. , Inoue Y. , Ioka K. , Itoh Y. , Kaji T. , Kajita T. , Kakizaki M. , Kamiizumi M. , Kambara S. , Kanda N. , Kanemura S. , Kaneyama M. , Kang G. , Kasuya J. , Kataoka Y. , Kawai N. , Kawamura S. , Kim C. , Kim H. , Kim J. , Kim Y. , Kimura N. , Kinugawa T. , Kirii S. , Kitaoka Y. , Kojima Y. , Kokeyama K. , Komori K. , Kotake K. , Kumar R. , Lee H. , Lee H. , Liu Y. , Luca N. , Majorana E. , Mano S. , Marchio M. , Matsui T. , Matsushima F. , Michimura Y. , Miyakawa O. , Miyamoto T. , Miyamoto A. , Miyo K. , Miyoki S. , Morii W. , Morisaki S. , Moriwaki Y. , Morozumi T. , Musha M. , Nagano S. , Nagano K. , Nakamura K. , Nakamura T. , Nakano H. , Nakano M. , Nakao K. , Narikawa T. , Quynh L.Nguyen , Ni W.-T. , Ochi T. , Oh J. , Oh S. , Ohashi M. , Ohishi N. , Ohkawa M. , Okutomi K. , Oohara K. , Alleano F. E.Peña , Pinto I. , Sago N. , Saijo M. , Saito Y. , Sakai K. , Sakai Y. , Sasaki Y. , Sasaki M. , Sato S. , Sato T. , Sekiguchi Y. , Seto N. , Shibata M. , Shimoda T. , Shinkai H. , Shoda A. , Somiya K. , Son E. , Suemasa A. , Suzuki T. , Suzuki T. , Tagoshi H. , Takahashi H. , Takahashi R. , Takamori A. , Takeda H. , Tanaka H. , Tanaka K. , Tanaka T. , Tatsumi D. , Tomaru T. , Tomura T. , Travasso F. , Tsubono K. , Tsuchida S. , Uchikata N. , Uchiyama T. , Uehara T. , Ueki S. , Ueno K. , Ushiba T. , van Putten M. H. P. M. , Vocca H. , Wada S. , Wakamatsu T. , Yamada T. , Yamamoto S. , Yamamoto T. , Yamamoto K. , Yamamoto A. , Yokoyama J. , Yokozawa T. , Yoon T. H. , Yuzurihara H. , Zeidler S. , Zhu Z.-H.
Published: January 2020

KAGRA is a 3-km interferometric gravitational wave telescope located in the Kamioka mine in Japan. It is the first km-class gravitational wave telescope constructed underground to reduce seismic noise, and the first km-class telescope to use cryogenic cooling of test masses to reduce thermal noise. The construction of the infrastructure to house the interferometer in the tunnel, and the initial phase operation of the interferometer with a simple 3-km Michelson configuration have been completed. The first cryogenic operation is expected in 2018, and the observing runs with a full interferometer are expected in 2020s. The basic interferometer configuration and the current status of KAGRA are described.
Cosmic Rays Investigation by the PAMELA experiment
Authors: Panico Beatrice , Campana D. , Osteria G. , Barbarino G. C. , Adriani O. , Bongi M. , Spillantini P. , Mori N. , Papini P. , Vannuccini E. , Bazilevskaya G. A. , Kvashnin A. N. , Stozhkov Y. I. , Bellotti R. , Monaco A. , Bruno A. , Cafagna F. , Boezio M. , Bonvicini V. , Mocchiutti E. , Munini R. , Zampa G. , Zampa N. , Vacchi A. , Bogomolov E. A. , Krutkov S. Y. , Vasilyev G. I. , Carlson P. , Pearce M. , Casolino M. , Castellini G. , De Santis C. , Marcelli L. , Mergé M. , Picozza P. , Sparvoli R. , Di Felice V. , Galper A. M. , Karelin A. V. , Koldashov S. V. , Koldobskiy S. , Yurkin Y. T. , Malakhov V. , Leonov A. , Mayorov A. G. , Mikhailov V. V. , Voronov S. A. , Martucci M. , Menn W. , Simon M. , Ricci M. , Ricciarini S. B.
Published: January 2020

PAMELA (Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics) is a satellite-borne experiment. It was launched on June 15th 2006 from the Baikonur space centre on board the Russian Resurs-DK1 satellite. For about 10 years PAMELA took data, giving a fundamental contribution to the cosmic ray physics. It made high-precision measurements of the charged component of the cosmic radiation challenging the standard model of the mechanisms of production, acceleration and propagation of cosmic rays in the galaxy and in the heliosphere. PAMELA gave results on different topics on a very wide range of energy. Moreover, the long PAMELA life gives the possibility to study the variation of the proton, electron and positron spectra during the last solar minimum. The time dependence of the cosmic-ray proton and helium nuclei from the solar minimum through the following period of solar maximum activity is currently being studied. Low energy particle spectra were accurately measured also for various solar events that occurred during the PAMELA mission. In this paper a review of main PAMELA results will be reported.
Status of the Project 8 Phase II
Authors: Guigue Mathieu
Published: January 2020

The Project 8 collaboration aims to measure the absolute neutrino mass scale using cyclotron radiation emission spectroscopy on the beta decay of tritium. The second phase of the project will measure a continuous spectrum of molecular tritium beta decays and extract the tritium endpoint value with an eV or sub-eV scale precision. Monoenergetic electrons emitted by gaseous 83mKr atoms are used to determine the relationship between cyclotron frequency and electron energy. This study allows us to optimize both the event reconstruction algorithm and the hardware configuration, in preparation for measuring the tritium beta decay spectrum. Phase II will benefit from a gas system of krypton and tritium that will allow measurement of and offline correction for magnetic field fluctuations. We present the recent progress in understanding the electron kinematics and implementing the magnetic field calibration.
Spectral analysis for the Majorana Demonstrator experiment
Authors: Hehn L , Abgrall N , Alvis S I , Arnquist I J , Avignone III F T , Barabash A S , Barton C J , Bertrand F E , Bode T , Bradley A W , Brudanin V , Busch M , Buuck M , Caldwell T S , Chan Y-D , Christofferson C D , Chu P-H , Cuesta C , Detwiler J A , Dunagan C , Efremenko Yu , Ejiri H , Elliott S R , Gilliss T , Giovanetti G K , Green M P , Gruszko J , Guinn I S , Guiseppe V E , Haufe C R , Henning R , Hoppe E W , Howe M A , Keeter K J , Kidd M F , Konovalov S I , Kouzes R T , Lopez A M , Martin R D , Massarczyk R , Meijer S J , Mertens S , Myslik J , O’Shaughnessy C , Othman G , Pettus W , Poon A W P , Radford D C , Rager J , Reine A L , Rielage K , Robertson R G H , Ruof N W , Shanks B , Shirchenko M , Suriano A M , Tedeschi D , Trimble J E , Varner R L , Vasilyev S , Vetter K , Vorren K , White B R , Wilkerson J F , Wiseman C , Xu W , Yakushev E , Yu C-H , Yumatov V , Zhitnikov I , Zhu B X
Published: January 2020

The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a ton-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and 76Ge-enriched germanium detectors totaling 44.1kg (29.7kg enriched detectors), located at the 4850’ level of the Sanford Underground Research Facility in Lead, South Dakota, USA. Data taken with this setup since summer 2015 at different construction stages of the experiment show a clear reduction of the observed background index around the ROI for 0νββ- decay search due to improvements in shielding. We discuss the statistical approaches to search for a धνββ-signal and derive the physics sensitivity for an expected exposure of 10kg· y from enriched detectors using a profile likelihood based hypothesis test in combination with toy Monte Carlo data.
Sensitive search for double electron capture on 124Xe in XMASS-I
Authors: Hiraide Katsuki
Published: January 2020

Double electron capture is a rare nuclear decay process in which two orbital electrons are captured simultaneously in the same nucleus. We have conducted an improved search for two-neutrino double electron capture on 124Xe and 126Xe using 800.0 days of the XMASS-I data. As a result of fitting the observed energy spectra with the expected signal and background, no significant signal is found. Therefore, we set the most stringent lower limits on their half-lives at 2.1 × 1022 years for 124Xe and 1.9 × 1022 years for 126Xe at 90% confidence level. The limits get improved by a factor of 4.5 compared to the previous result.
Latest results from NEMO-3 and commissioning status of the SuperNEMO demonstrator
Authors: Le Noblet Thibaud
Published: January 2020

The NEMO-3 experience was dedicated to the search for neutrinoless double beta decays (0νββ) and to the precise measurements of the two neutrino double beta decays (2νββ). The detector was installed at Laboratoire Souterrain de Modane (LSM) and investigated ββ decays among seven isotopes from 2003 to 2011. Its unique approach combining a calorimetric and a tracking measurement allows to fully reconstruct the ββ event topology with a very low background level. This feature also permits original searches such as the investigation of the hypothetical quadruple beta decay (0ν4β). Its successor, SuperNEMO, is currently under construction at LSM and will extend the sensitivity of the 0νββ search. The latest results from NEMO-3 concerning the 150Nd and 116Cd isotopes are presented as well as the installation status of the first SuperNEMO module.
The Super Kamionade Gadolinium Project
Authors: Sekiya Hiroyuki
Published: January 2020

Super-Kamiokande (SK) will be upgraded to Super-Kamiokande Gd (SK-Gd). This modification will enable it to identify low energy anti-neutrinos for the world’s first observation of the Diffuse Supernova Neutrino Background (DSNB). On average, there is one core-collapse supernova somewhere in the universe each second. The neutrinos emitted from all of these supernovae since the onset of stellar formation have suffused the universe. The flux of the DSNB is expected to be several tens per square centimeter per second. Theoretical models vary, but as many as five diffused supernova neutrinos per year above 10 MeV are expected to interact in SK. However, in order to separate these signals from the much more common solar and atmospheric neutrinos and other backgrounds, we need a new detection method. In 2015, the Super-Kamiokande Collaboration approved the SK-Gd project. It is the upgrade of the SK detector via the addition of water-soluble gadolinium (Gd) salt. Since then, we have been conducting many dedicated studies and developments for deploying Gd to SK.
The NEXT experiment for neutrinoless double beta decay searches
Authors: Simón A.
Published: January 2020

The goal of the NEXT experiment is the observation of the neutrinoless double beta decay in 136Xe using a gaseous xenon TPC with electroluminescent amplification and specialized photodetector arrays for calorimetry and tracking. After a prototyping period (2009-2014) where the technique was demonstrated, the Collaboration has completed the construction and started the operation of its first phase (NEXT-White or NEW) in the Laboratorio Subterraneo de Canfranc, in the Spanish Pyrenees, with the objectives of measuring in-situ the NEXT background model and the two-neutrino mode of the double beta decay under a radiopure regime. After running NEW, the Collaboration will operate a bigger detector, NEXT-100, which will look for the neutrinoless decay mode.
The Status of JUNO
Authors: Wang Zhimin
Published: January 2020

The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose underground experiment and the largest liquid scintillator (LS) detector going for neutrino mass hierarchy, precise measurement of neutrino oscillation parameters and other rare processes which include but not limited to solar neutrino, geo-neutrino, supernova neutrinos and the diffuse supernova neutrinos background. The 20” PMT system with ∼18000 high quantum efficiency phototubes, including Hamamatsu 20” and newly developed NNVT MCP 20” tubes, is the key component of JUNO experiment for better energy resolution, good detector response etc. This article reports the status of the JUNO experiment.
An overview of DarkBit, the GAMBIT dark matter module
Authors: Cornell Jonathan M.
Published: January 2020

In this conference paper, I give an overview of the capabilities of DarkBit, a module of the GAMBIT global fitting code that calculates a range of dark matter observables and corresponding experimental likelihood functions. Included in the code are limits from the dark matter relic density, multiple direct detection experiments, and indirect searches in gamma-rays and neutrinos. I discuss the capabilities of the code, and then present recent results of GAMBIT scans of the parameter space of the minimal supersymmetric standard model, with a focus on sensitivities of future dark matter searches to the current best fit regions.
Directional detection of Dark Matter with a nuclear emulsion based detector
Authors: Lellis Giovanni De
Published: January 2020

The nature of Dark Matter is one of the fundamental questions to be answered. Direct Dark Matter searches are focussed on the development, construction, and operation of detectors looking for the scattering of Weakly Interactive Massive Particles (WIMPs) with target nuclei. The measurement of the direction of WIMP-induced nuclear recoils is a challenging strategy to extend dark matter searches beyond the neutrino floor and provide an unambiguous signature of the detection of Galactic dark matter. Current directional experiments are based on the use of gas TPC whose sensitivity is strongly limited by the small achievable detector mass. NEWSdm is an innovative directional experiment proposal based on the use of a solid target made by newly developed nuclear emulsion films and read-out systems achieving a position accuracy of 10 nm.
NEWS-G, a Spherical Proportional Counter with low-Z target to search for sub-GeV Weakly Interacting Particles
Authors: Gorel Pierre
Published: January 2020

Despite several large-scale direct detection experiments operating worldwide, dark matter remains elusive. Not favoured by supersymmetric theories, the low Weakly Interacting Massive Particle (WIMP) mass regime (less than few GeV) has been largely ignored. The NEWS-G project builds on the experience gathered with the operation of the SEDINE detector at the Laboratoire Souterrain de Modane (France). The goal is to construct a 140cm diameter low-background Spherical Proportional Counter (SPC) capable of holding up to 10 bar of gas and to be operated at the SNOLAB underground facility (Canada). The use of low-Z target materials such as Ne, He and H, together with a strict selection of low activity materials will provide sensitivity to WIMP masses down to 0.1 GeV/c2. The detector is expected to be deployed in 2018.
Indirect Dark Matter Searches with IceCube
Authors: Medici Morten
Published: January 2020

I review results from searches for neutrinos from annihilating or decaying dark matter with the IceCube Neutrino Observatory, using data from the fully deployed detector and new event selection algorithms. So far, no signal has been observed and limits have been put on the dark matter lifetime, spin-dependent interaction cross section of dark matter and nucleons, as well as the velocity-averaged dark matter annihilation cross section. We present competitive limits on the annihilation of Galactic halo dark matter with mass between 10 GeV and 300 TeV, which are rather insensitive to the halo density profile. The limits on the spin-dependent scattering cross section from IceCube searches for dark matter annihilations in the Sun set the strongest such bounds for dark matter of mass above 100 GeV. IceCube has searched for halo dark matter decays and set stringent limits on the life time of particles with mass above 10 TeV.
Dynamically constrained model of galactic subhalos and impact on dark matter searches
Authors: Stref M. , Lavalle J.
Published: January 2020

The interaction properties of cold dark matter particles candidates are known to lead to the structuring of dark matter on scales much smaller than typical galaxies. This translates into a large population of dark matter subhalos inside our Galaxy, which impacts the predictions for direct and indirect searches. We present a model for this subhalo population that accounts for the gravitational effects experienced by those structures (tidal stripping and disk shocking) while remaining consistent with dynamical constraints. The subhalos mass density and annihilation profiles are derived. The impact of subhalos on indirect searches with cosmic rays antiprotons is evaluated using the latest data from the AMS-02 experiment.
Direction-sensitive dark matter search with a three-dimensional gaseous tracking detector
Authors: Yakabe Ryota , Miuchi Kentaro , Nakamura Kiseki , Hashimoto Takashi , Ikeda Tomonori , Taishaku Ryosuke , Nakazawa Miki , Ishiura Hirohisa , Tanimori Toru , Kubo Hidetoshi , Takada Atsushi , Sekiya Hiroyuki , Takeda Atsushi
Published: January 2020

NEWAGE is a direction-sensitive direct dark matter search experiment with a three-dimensional gaseous tracking detector (μ-TPC). Our goals are detection of the dark matter - nucleus scattering signal and the investigation of kinematics of the dark matter in the Galaxy. A dark matter search experiment with the NEWAGE-0.3b’ detector was performed from Jul. 2013 to Aug. 2016 (RUN14 to Run17). The total live time is 230.16 days which is about 8 times larger than that of our previous measurement. In the analysis, the event selection was improved and the background was reduced to about 1/3 at 50 keV. This work is important to investigate the properties of the dark matter in the Galaxy in the future dark matter research.
GINGER and GINGERINO
Authors: Virgilio A. D. V. Di , Belfi J. , Bosi F. , Giacomelli U. , Terreni G. , Beverini N. , Carelli C. , Ciampini D. , Ferrante I. , Fuso F. , Maccioni E. , Naletto G. , Ortolan A. , Altucci C. , Velotta L. , Porzio A.
Published: January 2020

GINGER (Gyroscopes IN General Relativity) is a proposal aiming at measuring the Lense-Thirring effect with an Earth based experiment, using an array of ringlasers, which are the most sensitive inertial sensors to measure the rotation rate of the Earth. The long term stability of the apparatus plays a crucial role for this experiment, and an underground location is advantageous from this point of view. GINGERINO is a single axis ring laser located inside the Gran Sasso laboratory. Gingerino has demonstrated that the very high thermal stability of the underground laboratory allows a continuous operation, sensitivity well below fractions of nrad/s, and with a duty cycle above 90% even in free running operation, without stabilisation of the scale factor of the ring laser.
Cosmogenic Activation of Germanium Detectors in EDELWEISS III
Authors: Scorza Silvia
Published: January 2020

Activation of germanium crystals due to cosmic rays becomes a serious limitation for experiments searching for rare events with germanium detectors. Cosmic ray induced activation of the detector components and, even more importantly, of the germanium itself during production, transportation and storage at the Earth’s surface, might result in the production of radioactive isotopes with long half-lives, with a possible impact on the expected background. We present a measurement of the cosmogenic activation in the cryogenic germanium detectors of the EDELWEISS III direct dark matter search experiment. The decay rates measured in detectors with different exposures to cosmic rays above ground are converted into production rates of different isotopes. They are compared to model predictions present in literature and to estimates calculated with the ACTIVIA code.
ZICOS - A new project for neutrinoless double beta decay using Zirconium complex in organic liquid scintillator
Authors: Fukuda Y. , Kamei Y. , Narengerile  , Obata A. , Moriyama S. , Ogawa I. , Gunji T. , Hayami R. , Tsukada S.
Published: January 2020

A liquid scintillator containing 96Zr has been developed for ZICOS experiment. We will use 180 tons of liquid scintillator with 64 % photo coverage of 20 inch photomultiplier. In order to reach the sensitivity [math] ≥ 1027 years, we have to achieve 50 % enrichment of 96 Zr and reduce 95 % of 208Tl decay backgrounds. Using Monte Carlo simulation, we could reduce 93 % of 208Tl background with 78 % efficiency for 0νββ signal using difference of Cherenkov hit pattern. For the separation of Cherenkov and scintillation signals, we measured the timing pulse shape of Zr loaded liquid scintillator using FADC digitizer, and we found an inconsistent pulse shape at the rising time with the template of scintillation. Also the event rate with an inconsistent pulse shape seems to have a directionality.
Interval estimation of bounded parameters
Authors: Lokhov A V , Tkachov F V
Published: January 2020

We consider the construction of interval estimates for the parameters with one-sided constraints. We show that the so-called method of sensitivity limit yields a correct solution of the problem. Derived are the solutions for the cases of a continuous distribution with non-negative estimated parameter and a discrete distribution, specifically a Poisson process with background. For both cases, the best upper limit is constructed that accounts for the a priori information. Particular applications to the neutrino mass measurements, rare processes (neutrinoless double beta-decay etc.) searches and cosmic ray studies are discussed.
The Euclid Near Infrared Spectro-Photometer (NISP) instrument and science
Authors: Mauri N , Dusini S , Fornari F , Ferdinando D Di , Giacomini F , Laudisio F , Patrizii L , Sirignano C , Sirri G , Stanco L , Tenti M , Valenziano L
Published: January 2020

Euclid is an ESA mission designed to understand why the expansion of the Universe is accelerating and what is the nature of the dark energy responsible for this acceleration. By measuring two cosmological probes simultaneously, the Weak Gravitational Lensing and the Galaxy Clustering (BAO and Redshift-Space distorsions), Euclid will constrain dark energy, general relativity, dark matter and the initial conditions of the Universe with unprecedented accuracy. Euclid will be equipped with a 1.2 m diameter SiC mirror telescope feeding 2 instruments: the visible imager and the Near-Infrared Spectro-Photometer. Here the Euclid’s observation probes and main aims are recalled, and the NISP instrument and expected performances are presented.
Design improvements to cables and connectors in the Majorana Demonstrator
Authors: Haufe C R , Reine A L , Abgrall N , Alvis S I , Arnquist I J , Avignone F T , Barabash A S , Barton C J , Bertrand F E , Bode T , Bradley A W , Brudanin V , Busch M , Buuck M , Caldwell T S , Chan Y-D , Christofferson C D , Chu P-H , Cuesta C , Detwiler J A , Dunagan C , Efremenko Yu , Ejiri H , Elliott S R , Gilliss T , Giovanetti G K , Green M P , Gruszko J , Guinn I S , Guiseppe V E , Hehn L , Henning R , Hoppe E W , Howe M A , Keeter K J , Kidd M F , Konovalov S I , Kouzes R T , Lopez A M , Martin R D , Massarczyk R , Meijer S J , Mertens S , Myslik J , O’Shaughnessy C , Othman G , Pettus W , Poon A W P , Radford D C , Rager J , Rielage K , Robertson R G H , Ruof N W , Shanks B , Shirchenko M , Suriano A M , Tedeschi D , Trimble J E , Varner R L , Vasilyev S , Vetter K , Vorren K , White B R , Wilkerson J F , Wiseman C , Xu W , Yakushev E , Yu C-H , Yumatov V , Zhitnikov I , Zhu B X
Published: January 2020

The MAJORANA DEMONSTRATOR is an experiment constructed to search for neutrinoless double-beta decays in germanium-76 and to demonstrate the feasibility to deploy a ton-scale experiment in a phased and modular fashion. It consists of two modular arrays of natural and 76Ge-enriched germanium p-type point contact detectors totaling 44.1 kg, located at the 4850’ level of the Sanford Underground Research Facility in Lead, South Dakota, USA. The DEMONSTRATOR uses custom high voltage cables to bias the detectors, as well as custom signal cables and connectors to read out the charge deposited at each detectors point contact. These low-mass cables and connectors must meet stringent radiopurity requirements while being subjected to thermal and mechanical stress. A number of issues have been identified with the currently installed cables and connectors. An improved set of cables and connectors for the MAJORANA DEMONSTRATOR are being developed with the aim of increasing their overall reliability and connectivity. We will discuss some of the issues encountered with the current cables and connectors as well as our improved designs and their initial performance.
Preliminary Design of Readout Electronics for CDEX-10 in CJPL
Authors: Xue Tao , Zhu Jinfu , Gong Guanghua , Li Jianmin
Published: January 2020

CDEX (China Dark Matter Experiment) is now upgraded to about 10 kg HPGe (High Purity Germanium) detectors and new dedicated readout electronics is in operation. The readout system is interfaced to the front preamplifiers, which have two “slow” outputs with typical 20 μs shaping time and two “fast” output with typical 200 ns shaping time. 8 channels 14-Bit 100 MSPS FADC and 2 channels 12Bit 2000 MSPS FADC are embedded in the readout 6U prototype board. The RAIN1000Z2 readout module based on ZYNQ SoC is used for readout with Gigabit Ethernet.
Dalitz decays of vector mesons in relativistic quark model
Authors: Haurysh V.Yu. , Andreev V. V.
Published: January 2020

In the course of work, basing on the previously developed method for calculating integral representations of decay constants for pseudoscalar and vector mesons in the frame of point form of Poincare-covariant quark model, the research of ω- and ϕ-mesons decays form-factors for Dalitz

V

(

q

Q
¯

)

→
P

(

q

Q
¯

)

ℓ
+

ℓ
−

decays has been carried out. It is shown that the usage of the pseudoscalar density constant with integral representations of decay constants

P

(

q

Q
¯

)

→
ℓ

ν
ℓ

,

V

(

q

Q
¯

)

→

ℓ
+

ℓ
−

and

ℓ
→
P

(

q

Q
¯

)

ν
ℓ

leads to parameters which can be used for the study of

V

(

q

Q
¯

)

→
P

(

q

Q
¯

)

ℓ
+

ℓ
−

decay form-factors. As a result of the work, the behaviour of (t) F

ωπγ* (t) and F

ϕηγ* (t) form-factors compared with the experimental data in the interval q < 0.5 GeV is researched.
Optimized determination of the polarized Bjorken sum rule
Authors: Kotlorz D , Mikhailov S V , Kotlorz A
Published: January 2020

We determine the polarized Bjorken sum rule

Γ
1

p
−
n

in two different ways: phenomenologically, by means of integration of the spin structure function

g
1

p
−
n

within the truncated moment approach and theoretically, with use of the renormalization group for the optimization of the perturbation series. Presented approaches are universal and can be applied to any of the DIS sum rules.
Electromagnetic and gravitomagnetic structure of pions and pion-nucleon scattering
Authors: Selyugin O.V.
Published: January 2020

Taking into account PDFs obtained by various Collaborations, the momentum transfer dependence of GPDs of the pion are obtained. The calculated electromagnetic and gravitomagnetic form factors of the pions and nucleons are used for the description of the pion- nucleon elastic scattering in a wide energy and momentum transfer region with minimum fitting parameters.
NICA absolute Polarimeter
Authors: Kulikov M V , Fimushkin V V , Kuzyakin R A , Prokofichev Yu V , Shumkov A M
Published: January 2020

The development of the absolute Polarimeter APol with an internal polarized atomic hydrogen/deuterium jet target for NICA collider is presented. It is proposed to install the polarimeter into the “warm” gap of the collider ring arc. The polarized jet will cross both accelerated beams. The jet target is based on the classical atomic beam source principle. Expected target thickness of the jet in the interaction regions is 1012 atom/cm2. APol utilizes a reaction of elastic scattering of identical nuclei (protons or deuterons). The polarization of the accelerated beams is determined by use of an actual analyzing power which is measured in turn in scattering of unpolarized accelerated beams on the polarized atomic jet. The polarization of the atomic hydrogen/deuterium jet will be measured by Breit-Rabi polarimeter placed under the collider ring into a jet catcher volume.
Spin structure of exclusive ω muoproduction at COMPASS
Authors: Mariański Bohdan
Published: January 2020

Spin Density Matrix Elements (SDMEs) are determined for exclusive ω meson production on unpolarized protons, in the COMPASS kinematic region of 1.0 (GeV/c)2 < Q
2 < 10.0 (GeV/c)2, 5.0 GeV/c2 < W < 17.0 GeV/c
2 and

0.01

(

GeV
/
c

)

2

<

p
T
2

<
0.5

(

GeV
/
c

)

2

. Using extracted the preliminary SDMEs values the hypothesis of S-Channel Helicity Conservation (SCHC) is studied. Certain matrix elements that correspond to the transition

γ
T
*

→

V
L

(

e
.g
.

r

00

5

)

indicate violation of SCHC in exclusive ω production. A sizable contribution of unnatural parity exchange amplitudes is found for exclusive ω meson muoproduction, and there is a clear indication of its decrease with increasing W. The extracted longitudinal-to-transverse cross section ratio is 0.553 ± 0.044 ± 0.020.
Study of the polarization observables in dp → dp reaction at the deuteron energy of 800 MeV
Authors: Mezhenska O. , Averyanov A.V. , Chernykh E.V. , Enache D. , Gurchin Yu.V. , Isupov A.Yu. , Janek M. , Karachuk J-T , Khrenov A.N. , Krivenkov D.O. , Kurilkin P.K. , Ladygin V.P. , Ladygina N.D. , Livanov A.N. , Piyadin S.M. , Reznikov S.G. , Skhomenko Ya.T. , Terekhin A.A. , Tishevsky A.V. , Uesaka T. , Urban J.
Published: January 2020

The polarization observables are sensitive to the two nucleón (2NF) and three-nucleon structures (3NF) of the nuclei. The aim of the deuteron spin structure (DSS) experiment is to obtain polarization observables in dp elastic scattering at large CMS angles (> 60°) and in dp breakup. Of great importance is the study of polarizations observables in these reactions at intermediate energies because the experimental and theoretical data are very scarce. In this review, results of vector and tensor analyzing powers obtained at JINR Nuclotron at 800 MeV will be presented.
Results of Measurements of the Analyzing Powers for Polarized Neutrons on C, CH2 and Cu Targets for Momenta Between 3 and 4.2 GeV/c
Authors: Sitnik I M , Basilev S N , Bushuev Yu P , Gavrishchuk O P , Glagolev V V , Kirillov D A , Kostayeva N V , Kovalenko A D , Legostaeva K S , Livanov A N , Philippov I A , Piskunov N M , Povtoreiko A A , Rukoyatkin P A , Shindin R A , Shipunov A V , Shutov A V , Slepnev V M , Slepnev I V , Terletskiy A V , Hamilton K , Montgomery R , Annand J R M , Marchand D , Wang Y , Tomasi-Gustafsson E , Perdrisat C F , Punjabi V , Martinska G , Urban J , Musinsky J
Published: January 2020

The analyzing powers for neutron charge exchange nA → pX reactions on nuclei have been measured on C, CH2 and Cu targets at incident neutron momenta 3.0 - 4.2 GeV/c by detecting one charged particle in forward direction. The polarized neutron measurements are the first of their kind. The experiment was performed using the Nuclotron accelerator in JINR Dubna, where polarized neutrons and protons were obtained from breakup of a polarized deuteron beam which has a maximum momentum of 13 GeV/c. The polarimeter ALPOM2 was used to obtain the analyzing power dependence on the transverse momentum of the final-state nucleon. These data have been used to estimate the figure of merit of a proposed experiment at Jefferson Laboratory to measure the recoiling neutron polarization in the quasi-elastic 2
H(e, e′n) reaction, which yields information on the charge and magnetic elastic form factors of the neutron.
On background study for MMT-Drell-Yan process at SPD (NICA) energy
Authors: Skachkova Anna
Published: January 2020

MMT-DY process in case of polarized beams at SPD may allow to measure the full set of leading TMDs and provide an access to GPDs, thus is of great interest to study at NICA. But this process is always accompanied with a huge background. Minimum-bias background, as the most strong one, together with some QCD processes, were simulated by use of PYTHIA6.4 Monte Carlo generator and compared to the signal process at the case of proton-proton beams with Ecm
= 27 GeV. The processes were considered in the two regions of muon pair invariant mass. The set of criteria for background discrimination is proposed. The efficiencies of these criteria are estimated.
Stabilization of small nitrogen clusters via spatial constraint
Authors: Gimaldinova M A , Zemenkov L I , Merinov V A
Published: January 2020

We apply density functional theory to calculate activation barriers for dissociations of small all-nitrogen clusters N4 and N6. The effect of external spatial constraint was also considered. We found that spatial constraint results in significant stabilization of both regarded clusters. So, the spatial constraint can be considered as an efficient method for stabilization of high-energy nitrogen structures.
Lichen cover mapping for caribou ranges in interior Alaska and Yukon
Authors: Macander Matthew J , Palm Eric C , Frost Gerald V , Herriges Jim D , Nelson Peter R , Roland Carl , Russell Kelsey L M , Suitor Mike J , Bentzen Torsten W , Joly Kyle , Goetz Scott J , Hebblewhite Mark
Published: January 2020

Previous research indicates that the effects of climate warming, including shrub expansion and increased fire frequency may lead to declining lichen abundance in arctic tundra and northern alpine areas. Lichens are important forage for caribou (Rangifer tarandus), whose populations are declining throughout most of North America. To clarify how lichen cover might affect caribou resource selection, ecologists require better data on the spatial distribution and abundance of lichen. Here, we use a combination of field data and satellite imagery to model lichen cover for a 583 200 km2area that fully encompasses nine caribou ranges in interior Alaska and Yukon. We aggregated data fromin situvegetation plots, aerial survey polygons and unmanned aerial vehicle (UAV) imagery to align with 30 m resolution Landsat pixels. We used these data to train a random forest model with a suite of environmental and spectral predictors to estimate lichen cover. We validated our lichen cover model using reserved training data and existing external datasets, and found that reserved data from aerial survey polygons (R2 = 0.77) and UAV imagery (R2 = 0.71) provided the best fit. We used our lichen cover map to evaluate the influence of estimated lichen cover on caribou resource selection in the Fortymile Herd from 2012 to 2018 during summer and winter. In both seasons, caribou avoided lichen-poor areas (0%–5% lichen cover) and showed stronger selection as lichen cover increased to ∼30%, above which selection leveled off. Our results suggest that terrestrial lichen cover is an important factor influencing caribou resource selection in northern boreal forests across seasons. Our lichen cover map goes beyond existing maps of lichen abundance and distribution because it incorporates extensive field data for model training and validation and estimates lichen cover over a much larger spatial extent. We expect our landscape-scale map will be useful for understanding trends in lichen abundance and distribution, as well as for caribou research, management and conservation.
Study on A Random Forest Improvement Model in Internet of Vehicles
Authors: Li Yalin , Li Fei , Zhang Jiayan
Published: January 2020

Security model is the main means to protect the information security of automobile network. Among many relevant security models, stochastic forest model is a strong classifier model and can better prevent overfitting than decision tree model. It has good characteristics in resisting flood attacks and other aspects, but it has poor ability to resist Sybil attacks. Therefore, an identity authentication system is added on the basis of the original random forest model, which can resist Sybil attacks while supporting the work in the Internet of vehicles environment. Experimental results show that the model can achieve the described effect.
Research on Identification Algorithm Based on PPG Signal and Improved Convolutional Neural Network
Authors: Wan Dechao , Zhang Luqiao , Bai Yunxiang , Deng Hanghang
Published: January 2020

In this paper, an improved convolutional neural network model is proposed, which is used for the identification of ECG signals while PPG signals are rarely used. The PPG data from the mimic database is denoised by wavelet transform, and then directly sent to the model for automatic sign extraction and recognition. This method can achieve the highest recognition rate of 99.39% on PPG data in mimic database. This makes the identification based on PPG signal meet the requirements of high reliability. With the rapid development of sensors and wearable devices, this research can also meet the universality of one of the requirements of identification.
The Study of an Improved Text Clustering Algorithm for Self-Organizing Maps
Authors: Zhang Baolong , Hou Zemin
Published: January 2020

The traditional SOM algorithm need to determine the number of clustering categories in advance, which is very subjective. In this paper, an improved k-means initial value selection algorithm is proposed to calculate the number of clustering categories, which is applied to SOM network model. In this algorithm, the Latent Semantic Indexing is applied in the pre-processing stage of clustering, and the improved SOM algorithm is applied in the text clustering stage. Namely, the number of clustering categories obtained by the improved k-means initial value selection algorithm is taken as the number of neurons in the output layer of SOM network.
Simple Tight Performance Bound Based on the GFBT for Binary Linear Codes
Authors: Liu Jia , Zhang Mingyu , Chen Rongjun , Wang Chaoyong , An Xiaofeng , Wang Yufei
Published: January 2020

A simple tight upper bound, without any integral and optimal operations in its final version, is proposed over additive white Gaussian noise (AWGN) channels. We derive the simple bound both on the frame probability and on the bit error probability. The proposed bound is within the framework of Gallager’s first bounding technique (GFBT), in which the Gallager region is chosen by the hamming distance, avoiding the limitation of the Euclidean distance. To compute the upper bound inside the Gallager region, we can tighten the union bound not only by collecting more information about the receiving vector which can cause the maximum-likelihood (ML) decoding error events, but also by employing the independence between the ML decoding error events and some positions of the received vectors. The proposed bound is tight since numerical results show that it is tighter than the proposed bound by Divsalar (without any integral and optimal operations) and the proposed bound by Poltyrev (considered as one of the tightest upper bounds for the binary linear codes with lower rate).
Dynamic Priority Assignment Algorithm Based on Multi-Elements in Vehicular Ad-Hoc Network
Authors: Meng Fudong , Tian Jin
Published: January 2020

In Vehicular Ad-hoc Network, different messages have different degrees of urgency and have specific requirements on delay and reliability. In this paper, we propose a dynamic priority assignment algorithm based on multi-elements to adapt to the dynamic changes of vehicles and transmit messages in an accurately and orderly manner. A priority is assigned to each message based on static and dynamic factors and size of the message. After a detailed analysis of the allocated priorities, the results show that the algorithm we conceived can quickly and accurately allocate the priority for different kinds of messages based on the characteristics and requirements of them.
Development of Large-Range Dynamic Three-Component Sensor
Authors: Chai Jixin , Chen Kexing , Zhao Yinming , Xu Jian , Fan Xiaoyan
Published: January 2020

Currently, the vast majority of sensor applied in the field of dynamic testing is piezoelectric sensor, Piezoelectric sensors over 200t are very difficult to produce, However, the traditional strain sensor is not suitable for dynamic testing due to its insufficient frequency response, The large-range strain type dynamic three-component force sensor developed in this paper has been successfully applied in high-speed rail collision test experiment, which breaks the monopoly of piezoelectric sensor in the field of dynamic test and has a broad application prospect.
Temporal and Spatial Distribution of Multi-scale Drought in North China
Authors: Zhou Kai , Wang Yimin
Published: January 2020

The North China is located in the East Asian monsoon region. The uneven spatial and temporal distribution of water resources leads to frequent drought disasters, and drought has increasingly become a limiting factor for regional development. In this paper, the intrinsic evolution characteristics of multi-scale spatial and temporal distribution of meteorological drought in the past 57 years in North China are analyzed by using standardized precipitation evapotranspiration index and ensemble empirical mode decomposition with multi-time scale features. The results show that the North China region was generally humid in the 1960s and 1970s. Drought in the 1980s and 1990s increased relatively. The interannual SPEI of North China changed in 1991, and entered a relatively dry period in the late 1990s and 2000s. From the SPEI index sequence, the scale characteristics of each scale were extracted. It was found that the SPEI sequence of the three-month time scale in North China mainly existed in the three scale ranges of monthly, interannual and intergenerational, At the same time, through the comparison of the temporal and spatial distribution characteristics of the summer drought in june and august 2002 in North China, it was found that the severe drought in august 2002 was caused by the temporal and spatial overlap of short-term scale and long-term drought events.
Research on the Construction of Global Spatial Multi-Grid Model Considering the Geographic Features of China
Authors: Zhang Yongzhi , Zhang Keqi , Ye Xinyang , Wang Wei , Li Huafeng
Published: January 2020

According to the subdivision principles of global grid, the advantages and disadvantages of classical spherical grid generation method at home and abroad are analyzed and compared. Considered with the spatial characteristics of China and the current standards of Geographical data, this paper proposes a global spatial multi-grid subdivision method that could adapt to the characteristics of global space and take into account the geographical features of China. And on the basis of this, a global unified spatial multi-grid coding model has been established and the corresponding neighborhood search algorithm and coordinate transformation formula have been derived, which provided theoretical supports for global grid positioning and information sharing.
Simulation Design of Reconfigurable Multifrequency Yagi Antenna
Authors: Zhao Lili , Yu Pengpeng , Zhou Xinsheng , Dong Qicai , Wang Ziru , Li Haiyan , Su Lina
Published: January 2020

In order to reduce the operating cost and improve the benefits of communication system, it is a feasible scheme to reduce the number of antennas used while ensuring the communication quality. Because reconfigurable antenna has the characteristic of automatically changing a certain electrical characteristic parameter, it has become one of the hotspots in antenna research. In the design of this paper, reconfigurable antenna is realized by changing the working state of PIN diodes embedded in external feed matching network. The design of Yagi antenna is introduced below.
The Performance of One-Way Clutch in a Cam-Based Infinitely Variable Transmission
Authors: Al-Hamood Amjad , Jamali Hazim U , Abdullah Oday I , Schlattmann J
Published: January 2020

Continuously variable transmission is the system which provides a step-less change in transmission ratio between two rotating shafts. When it can provide zero ratio, it is known as infinitely variable transmission (IVT). These systems are mainly classified into two categories; traction and non-traction types. In the traction type, the power is transmitted by friction force that develops between the active elements in the mechanism, while in the non-traction systems, the power is transmitted via direct contact. A very common type of non-traction IVT is the cam-based system. In this type, the rotating motion of the input element is converted to oscillatory motion with continuously variable amplitude. Eventually, the oscillatory motion is rectified to one-way rotational motion by means of a one-way clutch (rectifier). The rectifier is considered an essential element in the IVT system, as it is subjected to an extreme dynamical condition. In this study, the performance of one-way clutches (rectifiers) in a cam-based IVT is presented. The IVT system under consideration is a combination of two identical units and in each one, a rectifier is fitted at the output shaft. It is required that this rectifier is able to efficiently transmit the power during its engagement. It should also generate minimal power loss during disengagements, when aggressive relative motion is presented between its parts. It has been found that the operation of the one-way clutch is mainly determined by the designed cam profile. For this study, the profile is a combination of constant speed and trapezoidal forms. It was also concluded that the value of the selected transmission ratio controls the amount of fluctuation in the acceleration, velocity and displacement and hence, the energy lost due to slippage of the clutches.
Multi-Response Optimization of Mechanical Properties of Al reinforced by Al2O3 and/or SiC using Grey Relational Analysis
Authors: Hlail Haneen Hameed , Al-Shafaie Saad Hameed
Published: January 2020

Metal matrix composites (MMCs) combine attractive characteristics of ceramics and metals. Al-hybrid composites are a recent generation of MMCs and have the potential to satisfy new demands in advanced engineering applications. In this work, Al-MMC has been fabricated by mixing various percentages of Al2O3 and/or SiC reinforcement into the Al alloy, using stir casting. The mechanical properties (hardness, yield strength, tensile strength, elongation and flexural strength) have been measured for the fabricated MMCs. Grey relational analysis (GRA), based on the Taguchi method, is applied using three factors Al2O3, SiC and Al2O3 + SiC with three levels. Results show that the all reinforcement materials have a significant influence on the response. Results also show that the Taguchi-based grey relational approach improved the properties of output response of hybrid MMC.
Selection of Suitable Precipitation CMIP-5 Sets of GCMs for Iraq Using a Symmetrical Uncertainty Filter
Authors: Khayyun Thair S , Alwan Imzahim A , Hayder Ali M
Published: January 2020

Prediction of future water resources in Iraq for the period 2020 to 2100 based on different scenarios of climatic change models by harnessing many calibrated Arc-SWAT models needs to select future precipitation data from suitable sources. Therefore, the selection of the appropriate source of the possible future precipitation time series data sets was studied by examining 20 models of the fifth phase of the Coupled Model Inter-comparison Project (CMIP-5.0) for General Circulation Models (GCMs). The Symmetrical Uncertainty (SU) approach was used to determine the performance of the 20 CMIP-5.0 sets of GCMs against a monthly scale of historical precipitation datasets at each one of 35 rain gauge stations spread throughout Iraq, and an appropriate ensemble of GCMs selected. The examined models were ranked as 1st, 2nd, 3rd, etc. based on the SU values at each station and the final ranking of the models was carried out using a multi-criteria decision-making (MCDM) method. The results showed that the HadGEM2-AO and HadGEM2-ES were the best (1st ranked) models at 31 stations, while the MIROC-5 and CSIRO-Mk-3.6 were the best models at Zakho and Duhok stations, respectively, and the BCC.CSM1.1.m and FIO.ESM were the best models at Samarra and Hilla stations, respectively. There was a variation in simulation preference regionally between the two models HadGEM2-AO and HadGEM2-ES in the second ranking except at Tel-Afer and Najaf stations. No predominant models were found in other ranks throughout Iraq. The results of the final ranking of these 20 CMIP-5 sets by the MCDM method thus showed that there are only four suitable GCMs, HadGEM2-AO, HadGEM2-ES, CSIRO.Mk3.6, and MIROC5 for data projections studying scenarios involving future water resources in Iraq.