bluuebunny/crossref_metadata_2025_split huggingface dataset:
More results from the OPERA experiment
Authors: Mauri N 
Published: January 2020

Abstract
The OPERA experiment reached its main goal by proving the appearance of tau-neutrinos in the CNGS muon-neutrino beam. A total sample of 5 candidates fulfilling the analysis defined in the proposal was detected with a S/B ratio of about ten allowing to reject the null hypothesis with a significance of 5.1 σ. The search was extended to ½
T-like interactions failing the kinematical analysis defined in the experiment proposal, to obtain a statistically enhanced, lower purity, signal sample. One such interesting neutrino interaction showing a double vertex topology with a high probability of being a tau-neutrino interaction with charm production will be reported. Based on the enlarged data sample the estimation of (math) in appearance mode is presented. The search for ½e interactions has been extended over the full data set with a more than twofold increase in statistics with respect to published data. The analysis of the νμ → νe channel is updated and the implications of the electron-neutrino sample in the framework of the 3+1 sterile model is discussed. An analysis of the νμ → ντ
oscillations in the framework of the sterile neutrino model has also been performed.
Investigation of double beta decay of 58Ni at the Modane Underground Laboratory
Authors: Rukhadze E. , Brudanin V.B. , Klimenko A.A. , Piquemal F. , Rukhadze N.I. , Shitov Yu.A. , Štekl I. , Warot G. 
Published: January 2020

Abstract
Investigation of double beta decay processes (β+EC, EC/EC) of 58Ni was performed at the Modane underground laboratory (LSM, France, 4800 m w.e.). A sample of natural nickel, containing ∼68% of 58Ni and a mass of ∼21.7 kg, was measured using ultra low-background HPGe detector Obelix (sensitive volume of 600 cm3) during ∼143.8 days. New experimental limits on 2νβ+EC decay of 58Ni to the ground 0+ and (math), 811 keV excited state of 58Fe, and 2νEC/EC decay of 58Ni to (math), 811 keV and (maht), 1 675 keV excited states of 58Fe were obtained in this measurement. There are -T1/2(β+EC, 0+ → 0+) > 1.7 × 1022 y; (math), (math), (math). For resonant neutrino-less radiative EC/EC decay with energy of 1 918.3 keV a new experimental limit of T1/2
(0νEC/EC – res, 1918KeV) > 4.1 ×1022 y was also obtained. All limits are at 90 % CL.
Search for eV Sterile Neutrinos – The Stereo Experiment
Authors: Schoppmann Stefan 
Published: January 2020

Abstract
In the recent years, major milestones in neutrino physics were accomplished at nuclear reactors: the smallest neutrino mixing angle θ13 was determined with high precision and the emitted antineutrino spectrum was measured at unprecedented resolution. However, two anomalies, the first one related to the absolute flux and the second one to the spectral shape, have yet to be solved. The flux anomaly is known as the Reactor Antineutrino Anomaly and could be caused by the existence of a light sterile neutrino eigenstate participating in the neutrino oscillation phenomenon. Introducing a sterile state implies the presence of a fourth mass eigenstate, while global fits favour oscillation parameters around sin2(2θ) = 0.09 and Δm2 = 1.8eV2.
The Stereo experiment was built to finally solve this puzzle. It is one of the first running experiments built to search for eV sterile neutrinos and takes data since end of 2016 at ILL Grenoble, France. At a short baseline of 10 metres, it measures the antineutrino flux and spectrum emitted by a compact research reactor. The segmentation of the detector in six target cells allows for independent measurements of the neutrino spectrum at multiple baselines. An active-sterile flavour oscillation could be unambiguously detected, as it distorts the spectral shape of each cell’s measurement differently.
This contribution gives an overview on the Stereo experiment, along with details on the detector design, detection principle and the current status of data analysis.
New Results from RENO using 1500 Days of Data
Authors: Seo Seon-Hee 
Published: January 2020

Abstract
RENO (Reactor Experiment for Neutrino Oscillation) is the first reactor neutrino experiment which began data-taking in 2011 with two identical near and far detectors in Yonggwang, Korea. Using 1500 live days of data, sin22θ13 and |Δm2
ee| are updated using spectral measurements: sin22θ13 = 0.086 ± 0.006 (stat.) ± 0.005 (syst.) and |Δm2
ee| = 2.61+015
-016 (stat.) ± 0.09 (syst.) (×10−3 eV2). The correlation between the 5 MeV excess rate and the reactor thermal power is again clearly observed with the increased data set.
Three-flavor neutrino oscillations and beyond
Authors: Tórtola Mariam 
Published: January 2020

Abstract
In this work we summarize the current status of global neutrino oscillation analyses in the three-neutrino framework. We first describe the different data samples included in the global fit, emphasizing the role of each of them in constraining a given set of parameters. Next, we discuss the main improvements obtained thanks to the consideration of the latest experimental data. The status of the yet-unknown parameters, such as the true neutrino mass ordering, the Dirac CP-violating phase and the octant of the atmospheric mixing angle is also commented. Finally, we discuss some scenarios where the measurement of the reactor mixing angle or the CP violation phase could be significantly affected by the presence of neutrino physics beyond the Standard Model.
Supernova Neutrinos at the DUNE Experiment
Authors: Weinstein Amanda 
Published: January 2020

Abstract
The Deep Underground Neutrino Experiment (DUNE) experiment, a 40-kton underground liquid argon time-projection-chamber detector, will have unique sensitivity to the electron flavor component of a core-collapse supernova neutrino burst. We present the expected capabilities of DUNE for measurements of neutrinos in the few-tens-of-MeV range relevant for supernova detection and its corresponding sensitivity to both neutrino physics and supernova astrophysics. Recent progress and some outstanding issues are highlighted.
The Hyper-K Near Detector Programme
Authors: Wilson Jeanne R. 
Published: January 2020

Abstract
The proposed Hyper-Kamiokande experiment (Hyper-K) is a next generation large water Cherenkov (WC) detector with a broad physics program consisting of neutrino beam measurements in search of leptonic CP violation, astrophysical measurements and a search for proton decay. Hyper-K will act as the far detector to measure the oscillated neutrino flux from the long-baseline beam of 0.6 GeV neutrinos/anti-neutrinos produced by a 1.3 MW proton beam at J-PARC in Japan. To minimise systematic uncertainties, particularly due to flux and cross-section uncertainties, detailed measurements of the unoscillated flux are required with a suite of near detectors. We review the challenges, and present the planned components of the near detector measurement suite, including a new intermediate Water Cherenkov Detector.
MiniBooNE-DM: a dark matter search in a proton beam dump
Authors: Aguilar-Arevalo Alexis A. 
Published: January 2020

Abstract
In a dedicated run where protons from the Fermilab Booster were delivered directly to the steel beam dump of the Booster Neutrino Beamline (BNB), the MiniBooNE detector was used to search for the production of sub-GeV dark matter particles via vector-boson mediators. The signal searched for was the elastic scattering of dark matter particles off nucleons in the detector mineral oil, with neutrinos being an irreducible background. A review of the experiment, its analysis methods, its results and future perspectives are summarized, demonstrating that beam dump experiments provide a novel and promising approach to dark matter searches.
DAMIC at SNOLAB
Authors: Chavarria A. E. 
Published: January 2020

Abstract
This report presents the past results, current status and future plans for DAMIC: a search for low-mass dark matter particles with low-noise CCDs. We summarize the extensive laboratory efforts on the characterization of the CCDs and the calibration of their response to potential dark matter signals and radioactive backgrounds. Recent results include exclusion limits on the spin-independent scattering of WIMPs with silicon nuclei and on the absorption of eV-scale hidden-photon dark matter by valence electrons. A 40 g 7-CCD array started operation in February 2017 and data acquisition is ongoing, with results expected in 2018. We outline the future plans for DAMIC-1K, a 1kg 50-CCD array with an ionization threshold of 2 e−.
The KDK (potassium decay) experiment
Authors: Di Stefano P.C.F. , Brewer N. , Fijałkowska A. , Gai Z. , Goetz K.C. , Grzywacz R. , Hamm D. , Lechner P. , Liu Y. , Lukosi E. , Mancuso M. , Melcher C. , Ninkovic J. , Petricca F. , Rasco A. C. , Rouleau C. , Rykaczewski K.P. , Squillari P. , Stand L. , Stracener D. , Stukel M. , WoliĔska-Cichocka M. , Yavin I. 
Published: January 2020

Abstract
Potassium-40 (40K) is a background in many rare-event searches and may well play a role in interpreting results from the DAMA dark-matter search. The electron-capture decay of 40K to the ground state of 40 Ar has never been measured and contributes an unknown amount of background. The KDK (potassium decay) collaboration will measure this branching ratio using a 40K source, an X-ray detector, and the Modular Total Absorption Spectrometer at Oak Ridge National Laboratory.
Low-mass WIMP searches with the EDELWEISS experiment
Authors: Gascon J. 
Published: January 2020

Abstract
The EDELWEISS experiment is a direct search for Weakly Interacting Massive Particles (WIMP) dark matter using an array of twenty-four 860 g cryogenic germanium detectors equipped with a full charge and thermal signal readout. The experiment is located in the ultra-low radioactivity environment of the Modane underground laboratory in the Frejus tunnel. WIMP limits, background rejection factors and measurements of cosmogenic activation recorded in long exposures are used to assess the performance of the third generation of EDELWEISS detectors in view of the search for WIMPs in the mass range from 1 to 20 GeV/c2. The developments in progress to pursue this goal in the coming years are also presented.
A method to reanalyze Dark Matter experimental results in different theoretical scenarios
Authors: Giuliani F. 
Published: January 2020

Abstract
There are a number of papers that calculate how the limits or positive results of current experiments would be if some specific twist is applied to the standard interpretation framework (e.g., SI interactions with fp
= fn). These works are usually not performed by members of the experiments, and therefore make very simple assumptions on experimental details like efficiencies. Nevertheless, it is possible to retain this type of information without actually knowing it, by starting from the final exclusion plots and working backwards. This possibility is discussed and exemplified.
CDEX Dark Matter Experiment: Status and Prospects
Authors: Ma Hao , Chen Yang , Yue Qian , Wang Li , Xue Tao , Zeng Zhi , Kang Kejun , Cheng Jianping , Li Yuanjing , Li Jianmin , Li Yulan 
Published: January 2020

Abstract
The China Dark Matter Experiment (CDEX) aims at direct searches of light Weakly Interacting Massive Particles (WIMPs) at the China Jinping Underground Laboratory (CJPL) with an overburden of about 2400m rock. Results from a prototype CDEX-1 994 g p-type Point Contact Germanium(pPCGe) detector are reported. Research programs are pursued to further reduce the physics threshold by improving hardware and data analysis. The CDEX-10 experiment with a pPCGe array of 10 kg target mass range is being tested. The evolution of CDEX program into “CDEX-1T Experiment” with ton-scale germanium detector arrays will also be introduced in this study.
Solar axion search by annual modulation with XMASS-I detector
Authors: Ichimura Koichi 
Published: January 2020

Abstract
Kaluza-Klein (KK) axions produced in the Sun have been proposed to explain several astrophysical anomalies. We searched for the decay of such solar KK axions using 832 × 359 kg • days XMASS-I data. No significant event rate modulation is found, and we set the first experimental constraint on KK axion photon-coupling of 4.8 × 10“12 GeV−1 for a KK axion number density of (math) = 4.07 × 1013 m3 at 90% C.L.
Energy response and position reconstruction in the DEAP-3600 dark matter experiment
Authors: Langrock Stefanie 
Published: January 2020

Abstract
DEAP-3600 is a dark matter WIMP (Weakly Interacting Massive Particles) search experiment, which aims to detect nuclear recoils from WIMP scattering in a liquid argon target. At WIMP masses of 100 GeV, DEAP-3600 has a projected sensitivity of 10−46 cm2 for the spin-independent elastic scattering cross section of WIMPs. The beta emissions from the intrinsic 39 Ar present in the natural Ar target, as well as external calibration sources, can be used to tune the energy calibration and position reconstruction in the energy region of interest (ROI) for WIMP signals. These proceedings will present the techniques used to determine the energy response and position reconstruction in DEAP-3600. Using these techniques, the light yield was found to be LY = (math) (fit syst.) ± 0.22(SPE syst.) PE/keVee with a fiducial mass for WIMP detection of 2 223 ± 74 kg for the first data set.
SuperCDMS SNOLAB - Status and Plans
Authors: Rau W 
Published: January 2020

Abstract
The Super Cryogenic Dark Matter Search (SuperCDMS) and its predecessor CDMS have been at the forefront of the search for Weakly Interacting Massive dark matter Particles (WIMPs) for close to two decades. Significant improvements in detector technology have opened up the low-mass parameter space (≲ 10 GeV/c2) where the experiment broke new ground with the CDMS low ionization threshold experiment (CDMSlite). Building on this success, SuperCDMS is preparing for the next phase of the experiment to be located at SNOLAB near Sudbury, Ontario. The new experimental setup will provide space for up to ∼200 kg of target mass in a considerably lower background environment. The initial payload of about 30 kg will be a mix of germanium and silicon targets in the form of both background discriminating iZIP and low-threshold HV detectors, pushing the sensitivity towards WIMPs with even lower masses and improving the cross-section reach of SuperCDMS by more than an order of magnitude. The long-term goal is to reach the neutrino-floor below 10 GeV/c2. We present the status of and plans for SuperCDMS at SNOLAB.
Studies of neutrino interactions at the Kuo-Sheng Neutrino Laboratory with sub-keV Ge-detectors
Authors: Singh Lakhwinder , Wong H.T. 
Published: January 2020

Abstract
Germanium detectors with point contact configuration is an exciting detector technology which provides sub-keV sensitivities as low as 100 eVee
with kg-scale detector mass. This detector technique offers a unique opportunity to realize experiments on dark matter, to enhance the sensitivity of electromagnetic properties of neutrino and coherent elastic scattering of neutrino nucleus with reactor neutrino source. The TEXONO collaboration have been pursuing this research program at the Kuo-Sheng Neutrino Laboratory (KSNL) in Taiwan. We will highlight our results on neutrino electromagnetic properties, search of sterile neutrinos, as well as studies towards observation of neutrino-nucleus coherent scattering. The detector R&D programs which allow us to experimentally probe this new energy window will be discussed. The efforts set the stage and complement the CDEX dark matter experiment at the new China Jinping Underground Laboratory (CJPL) in China.
Annual modulation search by XMASS-I with 2.7 years of data
Authors: Yamashita Masaki 
Published: January 2020

Abstract
In this work, we conducted annual modulation search for dark matter with 2.7 years of data taking with the XMASS-I detector. A total exposure was 800 live days times 832 kg. When we assume Weakly Interacting Massive Particle (WIMP) dark matter elastically scattering on the xenon target, the exclusion upper limit of the WIMP-nucleon cross section was 1.9×10−41cm2 at 8 GeV/c2. For model independent case, without assuming any specific dark matter model, we did not find any modulation signal with a p-value of 0.11 in the 1-20 keV energy region for the null hypothesis.
The Sanford Underground Research Facility
Authors: Heise J 
Published: January 2020

Abstract
The former Homestake gold mine in Lead, South Dakota, has been transformed into a dedicated facility to pursue underground research in rare-process physics, as well as offering unique research opportunities in other disciplines. The Sanford Underground Research Facility (SURF) includes two main campuses at the 4850-foot level (4300 m.w.e.) - the Davis Campus and the Ross Campus - that host a range of significant physics projects: the LUX dark matter experiment, the MAJORANA DEMONSTRATOR neutrinoless double-beta decay experiment and the CASPAR nuclear astrophysics accelerator. Furthermore, the BHUC Ross Campus laboratory dedicated to critical material assays for current and future experiments has been operating since Fall 2015. Research efforts in biology, geology and engineering have been underway at SURF for 10 years and continue to be a strong component of the SURF research program. Plans to accommodate future experiments at SURF are well advanced and include geothermal-related projects, the next generation direct-search dark matter experiment LUX-ZEPLIN (LZ) and the Fermilab-led international Deep Underground Neutrino Experiment (DUNE) at the Long Baseline Neutrino Facility (LBNF). SURF is a dedicated research facility with significant expansion capability, and applications from other experiments are welcome.
Low Background Measurement Capabilities at SNOLAB
Authors: Lawson Ian 
Published: January 2020

Abstract
Experiments currently searching for dark matter and studying properties of neutrinos require very low levels of radioactive backgrounds both in their own construction materials and in the surrounding environment. These low background levels are required so that the current and next generation experiments can achieve the required sensitivities for their searches. This presentation will describe the low background measurement facilities currently operating at SNOLAB and will discuss plans and options to expand these facilities to allow for the increased sensitivity required by the next generation of experiments.
VIP2 at Gran Sasso - Test of the validity of the spin statistics theorem for electrons with X-ray spectroscopy
Authors: Marton J. , Pichler A. , Bartalucci S. , Bazzi M. , Bertolucci S. , Berucci C. , Bragadireanu M. , Cargnelli M. , Clozza A. , Curceanu C. , Paolis L. De , Matteo S. Di , Egger J.-P. , Guaraldo C. , Iliescu M. , Laubenstein M. , Milotti E. , Pietreanu D. , Piscicchia K. , Scordo A. , Shi H. , Sirghi D. , Sirghi F. , Sperandio L. , Vazquez-Doce O. , Widmann E. , Zmeskal J. 
Published: January 2020

Abstract
In the VIP2 VIolation of the Pauli Exlusion Principle (PEP) experiment at the Gran Sasso underground laboratory (LNGS) we are searching for possible violations of standard quantum mechanics predictions. With high precision we investigate the Pauli Exclusion Principle and the collapse of the wave function (collapse models). We will present our experimental method of searching for possible small violations of the Pauli Exclusion Principle for electrons, via the search for “anomalous” X-ray transitions in copper atoms, produced by “new” electrons (brought inside a copper bar by circulating current) which could have the probability to undergo Pauli-forbidden transition to the ground state (1 s level) already occupied by two electrons. We will describe the concept of the VIP2 experiment taking data at LNGS presently. The goal of VIP2 is to test the PEP for electrons with unprecedented accuracy, down to a limit in the probability that PEP is violated at the level of 10−31. We will show preliminary experimental results obtained at LNGS and discuss implications of a possible violation.
Status of the TREX-DM experiment at the Canfranc Underground Laboratory
Authors: Aznar F , Castel J , Cebrián S , Coarasa I , Dafni T , Galán J , Garza J G , Iguaz F J , Irastorza I G , Luzón G , Mirallas H , Solórzano A Ortiz de , Ruiz-Chóliz E , Villar JA 
Published: January 2020

Abstract
The TREX-DM experiment is conceived to look for low mass WIMPs by means of a gas time projection chamber equipped with novel micromegas readout planes at the Canfranc Underground Laboratory. The detector can hold 20 l of pressurized gas up to 10 bar, which corresponds to 0.30 kg of Ar, or alternatively, 0.16 kg of Ne. The micromegas will be read with a self-triggered acquisition, allowing for effective thresholds below 0.4 keV (electron equivalent). The preliminary background model, following a complete material screening program, points to levels of the order of 1-10 counts keV−1 kg−1 d−1 in the region of interest, making TREX-DM competitive. The status of the commissioning, description of the background model and the corresponding WIMP sensitivity will be presented here.
Probing the absolute neutrino mass scale with the 163Ho: the HOLMES project
Authors: Gerone M De , Alpert B , Becker D , Bennett D , Biasotti M , Ceriale V , Dressier R , Faverzani M , Ferri E , Fowler J , Gallucci G , Gard J , Gatti F , Giachero A , Hays-Wehle J , Heinitz S , Hilton G , Koester U , Lusignoli M , Mates J , Nisi S , Orlando A , Pessina G , Puiu A , Ragazzi S , Reintsema C , Ribeiro-Gomes M , Schmidt D , Schumann D , Swetz D , Ullom J , Vale L 
Published: January 2020

Abstract
The HOLMES project aims to directly measure the electron neutrino mass using the electron capture decay (EC) of 163Ho down to the eV scale. It will perform a precise measurement of the end-point of the 163Ho calorimetric energy spectrum to search for the deformation caused by a finite electron neutrino mass. The choice of 163Ho as source is driven by the very low Q-value of the EC reaction (around 2.8 keV), which allows for a high sensitivity while keeping the overall activities to reasonable value (O(102)Hz/detector), thus reducing the pile-up probability. A large array made of thousands of Transition Edge Sensor based micro-calorimeters will be used for a calorimetric measurement of the EC 163Ho spectrum. The calorimetric approach, with the source embedded inside the detector, eliminates systematic uncertainties arising from the use of an external beta-source, and minimizes the effect of the atomic de-excitation process uncertainties. The commissioning of the first implanted sub-array is scheduled for the end of 2017. It will provide useful data about the EC decay of 163Ho together with a first limit on neutrino mass. In this paper the current status of the main tasks will be summarized: the TES array design and engineering, the isotope preparation and embedding, and the development of a high speed multiplexed SQUID read-out system for the data acquisition.
A novel experiment for coherent elastic neutrino nucleus scattering: CONUS
Authors: Buck C , Fülber K , Hakenmüller J , Heusser G , Lindner M , Maneschg W , Rink T , Strecker H , Schierhuber T , Wagner V , Wink R 
Published: January 2020

Abstract
The CONUS experiment (COherent elastic NeUtrino nucleus Scattering) aims at detecting coherent elastic neutrino nucleus scattering of reactor antineutrinos on Germanium. The experiment will be set up at the commercial nuclear power plant of Brokdorf, Germany, at a distance of ∼17 m to the reactor core. The recoil of the nuclei hit by the antineutrinos is detected with four high-purity point contact Germanium detectors with a very low threshold and an overall mass of about 4 kg. To suppress the background, the setup is equipped with a shell-like passive shield and an active muon veto system. The shield and the muon veto have successfully been tested at the shallow depth laboratory at Max-Planck-Institut für Kernphysik. Monte Carlo simulations have been performed to reproduce the prompt muon-induced background and to examine the induced neutron spectrum. Currently, the low threshold Germanium detectors are characterized and the experiment is prepared for commissioning.