bluuebunny/crossref_metadata_2025_split huggingface dataset:
NEOS: reactor neutrino experiment at short baseline
Authors: Oh Yoomin 
Published: March 2020

Abstract
Numbers of experiments are trying to measure an active-to-sterile neutrino oscillation using nuclear reactors. A precise measurement of the energy spectrum is also important to understand the reactor neutrinos and for their applications. The NEOS experiment is being conducted at 24 meter distance from a 2.8 gigawatt thermal power nuclear reactor core. It aims at finding a short baseline oscillation due to an eV scale sterile neutrino, and to provide a reactor neutrino energy spectrum with a high resolution and a high signal-to-background ratio.
Sum rules and asymptotic behaviors of neutrino mixing and oscillations in matter
Authors: Xing Zhi-zhong , Zhu Jing-yu 
Published: March 2020

Abstract
Similar to the case in vacuum, it is straightforward to describe neutrino oscillations in matter with the effective lepton flavor mixing matrix

U
∼

and neutrino mass-squared differences

Δ
∼

j
i

≡

m
∼

j
2

−

m
∼

i
2

(i, j = 1, 2, 3). By calculating two sets of sum rules of

U
∼

and

Δ
∼

j
i

, we have derived exact expressions of

|

U
∼

α
i

|

2

and

U
∼

α
i

U
∼

β
i

*

(for α, β = e, μ, τ and i = 1, 2, 3) and discussed the asymptotic behaviors of

|

U
∼

α
i

|

2

and

U
∼

and

Δ
∼

j
i

in very dense matter (i.e., in the limit of the matter parameter

A
=
2

2

G
F

N
e

E

approaching infinity).
Progress of Veto Detector of JUNO
Authors: Zhang Peng 
Published: March 2020

Abstract
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kiloton liquid scintillator detector with neutrino mass hierarchy determination as primary physics goal. The other measurements, including precise neutrino oscillation parameters, solar neutrino, geo-neutrino, supernova neutrinos and the diffuse supernova neutrinos background, will be performed at the same time. The detector will be built in a 700 meter deep underground laboratory. A multi-eto detector, composed of a Top Tracker and a Water Cherenkov, will be installed for cosmic muon detection and background reduction. The Top Tracker detector is placed above the central detector, and is composed of three layers of scintillating strips. The outer part of the Central Detector is filled with water and equipped with about 2400 MCP-PMTs (20 inches) to form the Water Cherenkov detector used for muon tagging. Thanks to the Veto detector, the cosmic muon induced fast neutron background can be reduced to a level of about 0.06/day.
Accuracy improvement of the atmospheric neutrino flux prediction using observed muon spectra at mountain altitude
Authors: Honda Morihiro , Sajjad Athar M. , Kajita Takaaki , Kasahara Katsuaki , Midorikawa Shoichi , Nishimura Jun 
Published: March 2020

Abstract
By the study of the variations of the atmospheric neutrino and muon fluxes, due to that of the hadronic interaction, we find that when have accurate atmospheric muon flux data, we can estimate the prediction error of the atmospheric neutrino flux calculating with the same interaction model from the residual. However, the relation of the residual of the muon flux and the error in the neutrino flux is largely dependent on the observation site of the muon flux. We study this relation at several observation sites, near Kamioka at sea level, same but 2770m a.s.l.., Hanle India (4500m a.s.l.), and at Balloon altitude (~ 32km).
Phenomenological study of texture zeros of neutrino mass matrix in minimal left-right symmetric model
Authors: Borgohain Happy , Das Mrinal Kumar , Borah Debasish 
Published: March 2020

Abstract
We studied the phenomenological implications of texture zeros in the neutrino mass matrix of the minimal left-right symmetric model (LRSM). Since the possibility of maximum zeros reduces the maximum number of free parameters of the model making it more predictive, we considered only those cases with maximum possible texture zeros in light neutrino mass matrix Mv
, Dirac neutrino mass matrix MD
and heavy right-handed (RH) neutrino mass matrix MRR
. We then computed the correlations among the different light neutrino parameters and then the new physics contributions to neutrinoless double beta decay(NDBD) for the different texture zero cases. We find that for RH neutrino masses above 1 GeV, the new physics contributions to NDBD can saturate the corresponding experimental bound.
TRISTAN measurements at the Troitsk nu-mass experiment
Authors: Brunst Tim 
Published: March 2020

Abstract
The KATRIN (Karlsruhe Tritium Neutrino) experiment investigates the energetic endpoint of the tritium beta-decay spectrum to determine the effective mass of the electron anti-neutrino with a sensitivity of 200 meV (90 % C.L.) after an effective data taking time of three years. The TRISTAN (tritium beta-decay to search for sterile neutrinos) group aims at detecting a sterile neutrino signature by measuring the entire tritium beta-decay spectrum with an upgraded KATRIN system. One of the greatest challenges is to handle the high signal rates generated by the strong activity of the KATRIN tritium source. Therefore, a novel multipixel silicon drift detector is being designed which is able to handle rates up to 100 Mcps with an excellent energy resolution for electrons of 300 eV (FWHM) at 10 keV. First seven-pixel prototype detectors were successfully installed and operated at the Troitsk nu-mass experiment, one of KATRIN’s technological predecessors. In this work, we present the results of these measurement campaigns.
The laser Isotope separation (LIS) methods for the enrichment of 48Ca.
Authors: Matsuoka K , Niki H , Ogawa I , Shinki Y , Kawashima Y , Matsumura K 
Published: March 2020

Abstract
Neutrino-less double beta decay measurement is a powerful tool to test the Majorana nature of neutrinos. Among the potential double beta decay nuclei, 48Ca has the largest Q value (4.3 MeV), we can expect the least background measurement. On the other hand, a smallness of natural abundance of 48Ca (~0.2%) requires an enrichment to increase the sensitivity to reach interesting regions (Inverted Hierarchy and Normal Hierarchy). We have been studying the laser isotope separation (LIS) methods for the enrichment of 48Ca, where a narrow band diode laser is used to excite the specific isotope in the calcium vapor beam. For the separation, two methods (deflection and ionization) are employed. In the deflection method, the 48Ca atoms are deflected by momentum transfers from laser photons by multiple absorption and emission. In the ionization method, an additional dye laser is used to ionize the excited 48Ca. In this paper, we will report the current status and future prospects of two methods of LIS for the enrichment of 48Ca.
Impact of theoretical reactor flux uncertainties and of the near detector on the JUNO measurements
Authors: Marrone Antonio , Capozzi Francesco , Lisi Eligio 
Published: March 2020

Abstract
JUNO is medium-baseline reactor neutrino experiment that will probe the neutrino spectrum mass ordering (MO) and will measure the mass-mixing oscillation parameters with unprecedented sub-percent precision. It will be complemented with a ton-level, high energy resolution liquid scintillator reference detector, TAO, that will measure the reactor neutrino spectrum with unprecedented accuracy. In this work we study if the limited knowledge of the reactor antineutrino spectrum and of its fine structure can have a significant effect on the mass ordering determination and on the precision measurements of the oscillation parameters, and try to assess the advantages of having the TAO reference detector.
Sensitivity to leptonic CP violation at Hyper-Kamiokande
Authors: Boschi T. 
Published: March 2020

Abstract
Hyper-Kamiokande is a next generation water Clierenkov detector, an order of magnitude larger than Super-Kamiokande. capable of large and diverse physics studies. Among these, it will study long baseline oscillation physics with great detail, thanks not only to a larger volume and higher detection efficiency, but also to an improved accelerator and near detector system at J-PARC. We study the effect of a new systematic error model 011 the overall sensitivity of the experiment to the neutrino oscillation parameters, with particular care for the CP violating phase. A variety of theoretical models will benefit from a precise measurement of δ
CP, which Hyper-Kamiokande has the capability of constraining, with good precision. The accuracy of the measurement, however, is dictated by the systematic uncertainties and hence it is essential to assess the impact of the new error model 011 the sensitivity.
Detector Physics with MicroBooNE
Authors: Chen Yifan 
Published: March 2020

Abstract
The MicroBooNE detector is a liquid argon time projection chamber (LArTPC), designed for the short-baseline neutrino physics program in the Booster neutrino beamline at Fermilab. Because of their exceptional calorimetric and tracking capabilities, LArTPCs are employed in many current and future neutrino experiments. MicroBooNE, as an operating physics experiment, plays a crucial role in characterising the performance of this technology. We present an overview of the ongoing detector physics studies in MicroBooNE, including a brief introduction to the detector sub-systems and a procedure for calibrating calorimetry in LArTPC. The latter involves studies of signal processing, charge uniformity, ionised electron lifetime and charge recombination. Through the laser system in MicroBooNE, we demonstrate that profound knowledge of the electric field is essential to conduct a neutrino experiment with LArTPCs.
Measuring the coherent elastic neutrino-nucleus scattering with an high intensity 51Cr radioactive source
Authors: Di Noto L , Bellenghi C , Chiesa D , Pallavicini M , Previtali E , Vignati M 
Published: March 2020

Abstract
The idea of measuring the coherent elastic nuclear scattering of neutrinos emitted by a high intensity 51Cr radioactive source is investigated. To produce the high intensity source, the radioactive material used in the GALLEX experiment (36 kg of Chromium 38.6% enriched in 50Cr) could be reactivated to an intensity of few MCi. The advantages of this source are that the activity can be measured at few per mill level and that the neutrino spectrum is well known. With a target volume of 2 dm3 of low-threshold detectors, if the background is limited, the crosssection might be measured with few percent precision. In this work the requirements for the experiment will be shown and the envisioned experimental challenges will also be discussed.
No tension between pulsar timing array upper limits on the nano-Hertz gravitational wave background and assembly models of massive black hole binaries
Authors: Middleton Hannah , Chen Siyuan , Pozzo Walter Del , Sesana Alberto , Vecchio Alberto 
Published: March 2020

Abstract
Pulsar timing arrays provide a means to observe the nano-Hertz gravitational wave background from the population of merging massive black hole binaries. Observations are placing increasingly stringent upper limits on the gravitational wave background. Upper limits and future detections will enable the study of the properties of the merging population. Recent upper limits have cast doubt on current predictions of the gravitational wave background. Here we perform a Bayesian analysis comparing upper limits to astrophysical prediction. So far models are consistent with observation. These proceedings summarise previous work in Ref. [1].
Prompt and accurate sky localization of gravitational-wave sources
Authors: Morisaki Soichiro , Raymond Vivien 
Published: March 2020

Abstract
Accurate, precise and prompt sky localization of gravitational-wave sources is essential to the success of multi-messenger astronomy. One of the most accurate sky localizations we can obtain is from full signal parameter estimation obtained with the LIGO-Virgo LALInference software, done after a quick initial sky localization with the Bayestar software. While more accurate, the improved analysis can take on the order of months to complete for a binary neutron star event. To solve this issue, we develop a new technique to speed up the parameter estimation. Our technique speeds up the parameter estimation by a factor of

O

(104) and enables updating the sky localization within 10 minutes after the detection.
Formation of binary black holes in star clusters as gravitational wave sources
Authors: Kumamoto Jun , Fujii Michiko S. , Tanikawa Ataru 
Published: March 2020

Abstract
Direct detections of gravitational wave suggest that ~ 30 solar mass binary black holes (BBHs) commonly exist in the Universe. One possible formation scenario of such BBHs is dynamical three-body encounters in a dense core of globular clusters, which consist of millions of stars. Compared to globular clusters, open clusters are less dense and less massive but more populous. Because of their shallow potential, they have not been considered to be a formation site of merging BBHs. However, we found a new channel for the formation of BBHs, which is dominant in open clusters. We performed direct N-body simulations of open clusters with a mass of 2500 solar mass for metallicity of Z/Z
⊙ = 0.1. The core-collapse time of open clusters is much shorter than that of globular clusters. Therefore, massive main-sequence stars can form binaries before they evolve to BHs. These main-sequence binaries experience mass transfer evolution, and some of them evolve to BBHs merging within the Hubble time. From our simulations, we estimated the merger rates of BBHs originated from open clusters.
Use of poly(ethylene naphthalate) as a self-vetoing structural material
Authors: Efremenko Y , Fajt L , Febbraro M , Fischer F , Guitart M , Hackett B , Hayward C , Hodák R , Majorovits B , Manzanillas L , Muenstermann D , Öz E , Pjatkan R , Pohl M , Radford D , Rouhana R , Schulz O , Štekl I , Stommel M 
Published: March 2020

Abstract
Poly(ethylene naphthalate), PEN, is an industrial polyester which has been shown to scintillate in the blue wavelength region. Combined with measurements of a high intrinsic radiopurity, this has sparked interest in the material for use in low-background experiments.
Cryogenic Electronics Development for CUPID
Authors: Huang R G , Mei Y , Kolomensky Yu G , Grace C 
Published: March 2020

Abstract
CUPID (CUORE Upgrade with Particle ID) is a next-generation ton-scale bolometric experiment that will search for neutrinoless double beta decay. CUPID will have reduced backgrounds compared to CUORE through the ability to distinguish between 0vββ events and α backgrounds by detecting light emissions. To achieve this, it will deploy on the order of 3000 sensors in its detector array, which will introduce additional technical challenges compared to the 1000 sensors currently in CUORE. Using only room-temperature electronics for CUPID would increase the thermal load on the cryostat from the necessary cabling and increase the complexity of the vacuum system. A multiplexed readout with cryogenic electronics is a potentially appealing solution to these challenges. This work will present a characterization of CMOS devices that will guide future cryogenic ASIC design for CUPID readout.
Development and performance of the 20” PMT for Hyper-Kamiokande
Authors: Bronner C , Nishimura Y , Xia J. , Tashiro T. 
Published: March 2020

Abstract
The inner detector of the future Hyper-Kamiokande experiment will be instrumented with 40000 20” photo-multiplier tubes (PMTs). Two models of PMTs are considered: the R12860 from Hamamatsu Photonics (nominal option), and the GDB-6203 from North Night Vision Technology (alternative option). Both models show improved performances compared to the PMTs used in the currently running Super-Kamiokande experiment. We present here the measurements of the performance of the nominal and alternative option PMTs done in the context of the Hyper-Kamiokande project, as well as the first use of those new PMTs in a running experiment, and other on-going developments for their future use in the Hyper-Kamiokande detector.
Characterization of new photo-detectors for the future dark matter experiments with liquid xenon
Authors: Ozaki Kosuke , Kazama Shingo , Yamashita Masaki , Itow Yoshitaka , Moriyama Shigetaka 
Published: March 2020

Abstract
In the last three decades, numerous terrestrial experiments were built to search for a faint interaction between Weakly Interacting Massive Particles (WIMP) and ordinary matter. Among them, experiments using dual-phase xenon time projection chambers (TPCs) are leading the search especially for high mass WIMPs. In these experiments, photomultipliers (PMTs) are used to detect the prompt primary scintillation and secondary electro-luminescence of ionized electrons generated following an interaction between WIMP and a Xe nucleus. However, PMTs have several important shortcomings: their residual radioactivity levels, cost, bulkiness, and stability at cryogenic temperatures. Therefore, several alternative technologies are under consideration toward future dark matter experiments using ~50 tons of liquid xenon (LXe). One such technology is silicon photomultipliers (SiPM). SiPM have very low radioactivity, compact geometry, low operation voltages and reasonable photo-detection efficiency for vacuum ultra violet (VUV) light. However, current SiPM still have ~two order of magnitude higher dark count rate compared to PMTs. In order to solve this problem, we are currently developing a new SiPM with the help of Hamamatsu. In this paper, we report the current status of the performance measurements of the new SiPM developed with Hamamatsu to improve the dark count rate (DCR).
Large area photo-detection system using 3” PMTs for the Hyper-Kamiokande Outer-Detector
Authors: Zsoldos Stephane 
Published: March 2020

Abstract
Hyper-Kamiokande, scheduled to begin construction as soon as 2020, is a next generation underground water Cherenkov detector, based on the highly successful Super- Kamiokande experiment. It will serve as a far detector, 295 km away, of a long baseline neutrino experiment for the upgraded J-PARC beam in Japan. It will also be a detector capable of observing — far beyond the sensitivity of the Super-Kamiokande detector — proton decay, atmospheric neutrinos, and neutrinos from astronomical sources.
An Outer Detector (OD) consisting of PMTs mounted behind the inner detector PMTs and facing outwards to view the outer shell of the cylindrical tank, would provide topological information to identify interactions originating from particles outside the inner detector. Any optimization would lead to a significant improvement for the physics goals of the experiment, which are the measurement of the CP leptonic phase and the determination of the neutrino mass hierarchy.
An original setup using small 3” PMTs is being designed for the Hyper-Kamiokande OD. They would give better redundancy, spatial, and angular resolution, as they would be twice or three times more photosensors that the original 8” design proposal of the experiment, and for a reduce cost. Several 3” PMTs candidates considered for the Hyper-Kamiokande OD have been characterized at Queen Mary University London. They all show a very low dark counts and good collection efficiency, which makes them excellent choice to be used in the experiment.
Characterization of the Sos Enattos site for the Einstein Telescope
Authors: Naticchioni L , Boschi V , Calloni E , Capello M , Cardini A , Carpinelli M , Cuccuru S , D’Ambrosio M , de Rosa R , Di Giovanni M , d’Urso D , Fiori I , Gaviano S , Giunchi C , Majorana E , Migoni C , Oggiano G , Olivieri M , Paoletti F , Paratore M , Perciballi M , Piccinini D , Punturo M , Puppo P , Rapagnani P , Ricci F , Saccorotti G , Sipala V , Tringali M C 
Published: March 2020

Abstract
In this work we report the ongoing characterization of the Sos Enattos former mine (Sardinia, Italy), one of the two candidate sites for the Einstein Telescope (ET), the European third-generation underground interferometric detector of Gravitational Waves. The Sos Enattos site lies on a crystalline basement, made of rocks with good geomechanical properties, characterized by negligible groundwater. In addition, the site has a very low seismic background noise due to the absence of active tectonics involving Sardinia. Finally, the area has a low population density, resulting in a reduced anthropic noise even at the ground level. This location was already studied in 2012-2014 as a promising site for an underground detector. More recently, in March 2019, we deployed a new network of surface and underground seismometers at the site, that is currently monitoring the local seismic noise. Most of the energy carried by the seismic waves is due to the microseisms below 1 Hz, showing a significant correlation with the waves of the west Mediterranean sea. Above 1 Hz the seismic noise in the underground levels of the mine approaches the Peterson’s low noise model. Exploiting mine blasting works into the former mine, we were also able to perform active seismic measurements to evaluate the seismic waves propagation across the area. In conclusion we also give a first assessment about the acoustic and magnetic noise in this underground site.
Sagnac gyroscopes, GINGERINO, and GINGER
Authors: Bosi Filippo , Di Virgilio Angela D. V. , Giacomelli Umberto , Simonelli Andrea , Terreni Giuseppe , Basti Andrea , Beverini Nicolò , Carelli Giorgio , Ciampini Donatella , Fuso Francesco , Maccioni Enrico , Marsili Paolo , Stefani Fabio , Ortolan Antonello , Porzio Alberto , Altucci Carlo , Bajardi Francesco , Capozziello Salvatore , Velotta Raffele 
Published: March 2020

Abstract
GINGER (Gyroscopes IN GEneral Relativity), based on an array of large dimension ring laser gyroscopes, is aiming at testing on Earth General Relativity effects, like the gravito-electric and gravito-magnetic effects (also known as De Sitter and Lense-Thirring effects) and the Lorentz violation. The sensitivity is a function of the size and of the losses of the ring laser optical cavity. In this kind of measurement long term stability is matter of concern, and underground location is desirable for its natural thermal stability and for being isolated from atmospheric disturbances. Considering the present sensitivity of the RLG prototype GINGERINO, and assuming total losses of 6 ppm, a 40 m perimeter and 1 day of integration time, a sensitivity of the order of frad/s could be achieved. The construction of GINGER is at present under discussion.
Baksan large volume scintillation telescope: a current status
Authors: Petkov V B , Fazliakhmetov A N , Gangapshev A M , Gavrin V N , Ibragimova T V , Kochkarov M M , Kazalov V V , Kudrin D Yu , Kuzminov V V , Lubsandorzhiev B K , Malyshkin Yu M , Novikova G Ya , Shikhin A A , Sidorenkov A Yu , Ushakov N A , Veretenkin E P , Voronin D M , Yanovich E A 
Published: March 2020

Abstract
A current status of the project of a large volume scintillation telescope at the Baksan neutrino observatory is presented. The main research activities of the BLVST are low- energy neutrino physics, astrophysics and geophysics. To detect geoneutrinos, large-scale new- generation scintillator detectors located at large depths in the regions with a low background level from nuclear reactors are required. The Baksan Neutrino Observatory is geographically located in one of these places. Recently resumed R&D activities are aimed at the creation of new-generation telescope with a target mass of 10 kt at a depth of 4800 m.w.e. A small scale prototype is already under construction.