bluuebunny/crossref_metadata_2025_split huggingface dataset:
The NEXT experiment for neutrinoless double beta decay searches
Authors: Benlloch-Rodriguez Jose M. 
Published: March 2020

Abstract
NEXT is an experiment to search for the neutrinoless double beta decay of 136Xe using a high pressure xenon gas time projection chamber. This detector technology has several key advantages, including excellent energy resolution, powerful event classification based on track topology, and favorable mass scalability. The current stage of the experiment, NEXT-White, has been taking data at the Canfranc Underground Laboratory (LSC) in Spain since late 2016. In this talk, we will review recent results from NEXT-White after the first year of low-background operations with both 136Xe-depleted and 136Xe-enriched xenon gas. Background measurements will be shown as well as preliminary results on the two-neutrino mode double beta decay.
Development of signal readout electronics for LEGEND-1000
Authors: Edzards Frank , Mertens Susanne , Willers Michael 
Published: March 2020

Abstract
The Large Enriched Germanium Experiment for Neutrinoless ββ Decay (LEGEND) is a future ton-scale experimental program that will search for neutrinoless double beta decay (0vββ) in the isotope 76Ge with an unprecedented sensitivity. To achieve the projected discovery sensitivity at a half-life beyond 1028 yr after about ten years of data taking, it is of utmost importance to operate in a background-free environment. This can be supported by using highly integrated readout electronics such as application-specific integrated circuit (ASIC) technology. In this work we investigated the properties and electronic performance of a commercially available ASIC charge sensitive preamplifier, the XGLab CUBE preamplifier, together with a p-type point contact high-purity germanium detector.
Results of the MAJORANA DEMONSTRATOR’s Search for Double-Beta Decay of 76Ge to Excited States of 76Se
Authors: Guinn I.S. , Arnquist I.J. , Avignone F.T. , Barabash A.S. , Barton C. J. , Bertrand F.E. , Bos B. , Busch M. , Buuck M. , Caldwell T.S. , Chan Y-D. , Christofferson C.D. , Chu P-H. , Clark M.L. , Cuesta C. , Detwiler J.A. , Drobizhev A. , Edwins D. W. , Efremenko Yu. , Ejiri H. , Elliott S.R. , Gilliss T. , Giovanetti G.K. , Green M.P. , Gruszko J. , Guiseppe V.E. , Haufe C.R. , Hegedus R.J. , Henning R. , Hervas Aguilar D. , Hoppe E.W. , Hostiuc A. , Kidd M.F. , Kim I. , Kouzes R.T. , Lopez A.M. , López-Castaño J.M. , Martin E. L. , Martin R.D. , Massarczyk R. , Meijer S.J. , Mertens S. , Myslik J. , Oli T.K. , Othman G. , Pettus W. , Poon A.W.P. , Radford D.C. , Rager J. , Reine A.L. , Rielage K. , Ruof N.W. , Stortini M.J. , Tedeschi D. , Varner R.L. , Wilkerson J.F. , Wiseman C. , Xu W. , Yu C.-H. , Zhu B.X. 
Published: March 2020

Abstract
The MAJORANA DEMONSTRATOR is searching for double-beta decay of 76Ge to excited states (E.S.) in 76Se using a modular array of high purity Germanium detectors. 76Ge can decay into three E.S.s of 76Se. The E.S. decays have a clear event signature consisting of a ββ-decay with the prompt emission of one or two γ-rays, resulting in with high probability in a multi-site event. The granularity of the DEMONSTRATOR detector array enables powerful discrimination of this event signature from backgrounds. Using 21.3 kg-y of isotopic exposure, the DEMONSTRATOR has set world leading limits for each E.S. decay, with 90% CL lower half-life limits in the range of (0.56 ‒ 2.1) ⋅ 1024 y. In particular, for the 2v transition to the first 0+ E.S. of 76Se, a lower half-life limit of 0.68 ⋅ 1024 at 90% CL was achieved.
Neutrino CP Violation with the European Spallation Source neutrino Super Beam project
Authors: Gramstad Eirik 
Published: March 2020

Abstract
After measuring in 2012 a relatively large value of the neutrino mixing angle θ
13, the door is now open to observe for the first time a possible CP violation in the leptonic sector. The measured value of θ
13 also privileges the 2nd oscillation maximum for the discovery of CP violation instead of the usually used 1st oscillation maximum. The sensitivity at this 2nd oscillation maximum is about three times higher than for the 1st oscillation maximum inducing a lower influence of systematic errors. Going to the 2nd oscillation maximum necessitates a very intense neutrino beam with the appropriate energy. The world’s most intense pulsed spallation neutron source, the European Spallation Source (ESS), will have a proton linac with 5 MW power and 2 GeV energy. This linac, under construction, also has the potential to become the proton driver of the world’s most intense neutrino beam with very high potential to discover a neutrino CP violation. The physics performance of that neutrino Super Beam in conjunction with a megaton underground Water Cherenkov neutrino detector installed at a distance of about 500 km from ESS has been evaluated. In addition, the choice of such detector will extent the physics program to proton–decay, atmospheric neutrinos and astrophysics searches. The ESS proton linac upgrades, the accumulator ring needed for proton pulse compression, the target station optimization and the physics potential are described. In addition to neutrinos, this facility will also produce at the same time a copious number of muons which could be used by a muon collider. The ESS neutron facility will be fully ready by 2023 at which moment the upgrades for the neutrino facility could start.
New Physics with Scalar and Dark Non-Standard Interactions in Neutrino Oscillation
Authors: Ge Shao-Feng 
Published: March 2020

Abstract
The neutrino oscillation can arise from not just the genuine neutrino mass term but also neutrino non-standard interactions with the environmental matter or dark matter (DM). It is true that neutrino oscillation indicates some new physics beyond the Standard Model, but it is not necessarily a genuine neutrino mass term. We point out two possibilities of the scalar or dark non-standard interactions (NSI), both of which can induce correction to the neutrino mass term in the effective Hamiltonian that describes neutrino oscillation and hence opens the possibility of faking the neutrino mass term.
Collective flavor conversion including the neutrino halo in core-collapse supernovae
Authors: Zaizen Masamichi , Cherry John F. , Takiwaki Tomoya , Horiuchi Shunsaku , Kotake Kei , Umeda Hideyuki , Yoshida Takashi 
Published: March 2020

Abstract
We investigate collective neutrino oscillation (CNO) including neutrino halo effects in an iron core-collapse supernova model. We find that CNO suddenly occurs beyond the propagating shock front evolved from a 9.6M
⊙ star. Also, we find that neutrinos inwardly scattered by background matter can be ignored outside the shock front where CNO can occur, compared with outward-going neutrinos. Neutrinos get free from matter suppression and scattering with background matter beyond the shock front. Neutrino halo with wider intersection angles produces additional flavor transformation and sharpens the spectral splits.
Liquid Xenon detector R&D for 0v2ß search (KamXP)
Authors: Ueshima Kota 
Published: March 2020

Abstract
The R&D for a new type of liquid xenon (LXe) detector is ongoing to search for the neutrinoless double-beta decay (0v2β). As a result of the KamLAND-Zen experiment, it is very important to realize the all active region detector for the energy deposition of the radiation. Newly developed additional BG reduction techniques will improve the sensitivity of 0v2β search in the future. Our detector concept is LXe stored in a new type of plastic scintillator vessel. The wavelength of LXe scintillation light is shifted to visible light from 175nm (VUV) on the inner surface of the vessel. Therefore, the LXe scintillation light can be detected by photon sensors which are far away from the 0v2β target nuclei. The pulse shape difference between LXe and plastic scintillator is used for the additional BG reduction. In the future, 8B solar neutrino events will be one of the dominant BGs in 0v2β search. To reduce the 8B solar neutrino BG, the directional information of the Cherenkov light might be useful. The status of LXe detector R&D to improve the sensitivity of 0v2β search is reported.
ZICOS - Neutrinoless Double Beta Decay experiment using Zr-96 with an organic liquid scintillator -
Authors: Fukuda Yoshiyuki , Moriyama Shigetaka , Hiraide Katsuki , Ogawa Izumi , Gunji Takahiro , Hayami Ryohei , Tsukadaw Satoru , Kurosawa Shunsuke 
Published: March 2020

Abstract
A liquid scintillator containing a tetrakis(isopropyl acetoacetato)zirconium has been developed for ZICOS experiment. In order to reach the sensitivity

T

1
/
2

0
v

≥

10

27

years, we have to use tone scale of 96Zr and have to reduce 95 % of backgrounds from 208Tl decay, which should be major backgrounds observed around Q-value (3.35 MeV) of 96 Zr neutrinoless double beta decay. According to the Monte Carlo simulation, we demonstrated that new method using the topological information of Cherenkov light could reduce 93 % of 208Tl background with 78 % efficiency for 0vββ signal. For an identification of Cherenkov light, the precise spectral pulse shape from both Cherenkov and scintillation was directly measured by using sub-MeV electrons from 90Sr/90Y beta source. The observed pulse rise and fall (decay) time for Cherenkov light were 0.8 ns and 2.5 ns, respectively. They were actually shorter than those times of scintillation light which were also measured by 1.6 ns and 6.5 ns, respectively. This clear difference of rise time will be used for the pulse shape discrimination in order to select photomultiplier tube which receives Cherenkov lights, and the topological information of Cherenkov light will be used for the reduction of backgrounds from 208Tl decay.
Neutrino evolution and quantum decoherence
Authors: Stankevich Konstantin , Studenikin Alexander 
Published: March 2020

Abstract
Neutrino interactions with an external environment can influence the neutrino oscillation pattern and the oscillations can be damped as a result of the neutrino quantum decoherence. In particular, the quantum decoherence of neutrino states engendered by the neutrino radiative decay accounting for the nonstandard interactions (NSI) leads to the suppression of flavor neutrino oscillations in the solar neutrino fluxes.
Coherency in Neutrino-Nucleus Elastic Scattering
Authors: Sharma V. , Wong H. T. 
Published: March 2020

Abstract
Elastic scattering of neutrino with nucleus (v Ael
) is the well defined weak interaction processes in the Standard Model. The TEXONO collaboration adopt electro-cooled point contact Germanium detector technology with sub-keV sensitivities for the detection of v Ael
with reactor neutrinos. The detection of v Ael
cross-section is beneficial in studies of irreducible background in dark matter experiments, study of Solar and Supernova processes, etc. It also provides the probe the quantum mechanical coherence effects in electroweak interactions. We defined a parameter α to measure degree of coherency in v Ael
. Reactor neutrinos are found to be one of the best candidates to probe v Ael
with high coherency. The divergence from full coherence leads to the study of neutron density distribution and to constrain the sensitivities in probing physics beyond the Standard Model.
Expanding Core-Collapse Supernova Search Horizon of Neutrino Detectors
Authors: Halim Odysse , Vigorito C , Casentini C , Pagliaroli G , Drago M , Fafone V 
Published: March 2020

Abstract
Core-Collapse Supernovae, failed supernovae and quark novae are expected to release an energy of few 1053 ergs through MeV neutrinos and a network of detectors is operative to look online for these events. However, when the source distance increases and/or the average energy of emitted neutrinos decreases, the signal statistics drops and the identification of these low statistic astrophysical bursts could be challenging. In a standard search, neutrino detectors characterise the observed clusters of events with a parameter called multiplicity, i.e. the number of collected events in a fixed time-window. We discuss a new parameter called ξ (=multiplicity/duration of the cluster) in order to add the information on the temporal behaviour of the expected signal with respect to background. By adding this parameter to the multiplicity we optimise the search of astrophysical bursts and we increase their detection horizon. Moreover, the use of the ξ can be easily implemented in an online system and can apply also to a network of detectors like SNEWS. For these reasons this work is relevant in the multi-messengers era when fast alerts with high significance are mandatory.
Constraints on Nonstandard Neutrino Interaction from Neutrino Electron Scattering
Authors: Deniz M , Wong H T 
Published: March 2020

Abstract
Neutrino-electron scattering is a purely leptonic fundamental interaction and therefore provides an important channel to test the Standard Model (SM), especially at the low energy-momentum transfer regime [1, 2]. In this study Data on

v
¯

e

−
e

and ve
− e scattering from the TEXONO and LSND experiments, respectively, are used and constraints on neutrino Non-Stardard-Interactions (NSI) couplings depending on model-independent approaches, which are described by a four-Fermi point like interaction and depending on several beyond-Standard-Model-physics scenarios, mediated by massive intermediate particles including (1) an extra Z-prime gauge boson, (2) a new light spin-1 boson (NLS1B), (3) Dark Photon (DP), and (4) a charged Higgs boson (CHB), are placed via the neutrino-electron scattering channel to test the SM at a low energy-momentum transfer regime. The relevant parameter spaces are extended by allowing light mediators.
38 years of galactic observations in searching for neutrino bursts from core collapse supernovae with the Baksan Underground Scintillation Telescope
Authors: Petkov V B , Boliev M M , Dzaparova I M , Kochkarov M M , Kurenya A N , Novoseltsev Yu F , Novoseltseva R V , Striganov P S , Yanin A F 
Published: March 2020

Abstract
The core collapse of a massive star in the Milky Way will produce a neutrino burst, which will be detected by the Baksan Underground Scintillation Telescope (BUST). The stable and enough low background at the BUST is a clear asset for searching for neutrino bursts. Now two parts of the facility (with the total mass of 242 tons) are used as independent coinciding detectors. Such approach allows us to increase dependability detection of the neutrino signal and the radius of sensitivity of the BUST. The facility has the potential to see a supernova in the Galaxy independently from other detectors.
No burst candidate for the core collapse has been detected during the observation period of June 30, 1980, to June 30, 2019. The actual observation time is 33.477 years. This is the longest observation time of our Galaxy with neutrinos at the same facility. An upper bound on the mean frequency of gravitational collapses in the Galaxy is 6.88 per century (at 90% C.L.).
New ideas for ring formation and reconstruction in water-Cherenkov detectors
Authors: Berns Lukas 
Published: March 2020

Abstract
Water-Cherenkov detector technology is well established as is easily seen in the almost identical designs of Kamiokande, Super- and Hyper-Kamiokande. We explore methods to further improve upon their success by extracting directional information from originally lost photons using reflectors placed in the inactive space between PMTs. The reflected photons form a secondary antipodal ring, sensitive to the vertex position and track topology. We further show how ring reconstruction algorithms can benefit from modeling variations of the Cherenkov profile due to showering. Monte Carlo based quantitative estimates are accompanied by discussions of strategies to overcome potential issues with the presented methods. A new CNN-architecture to efficiently implement the cylindrical topology and geometry is also presented.
Angular power spectrum analysis on current and future high-energy neutrino data
Authors: Dekker Ariane , Chianese Marco , Ando Shin’ichiro 
Published: March 2020

Abstract
To constrain the contribution of source populations to the observed neutrino sky, we consider isotropic and anisotropic components of the diffuse neutrino data. We simulate through-going muon neutrino events by applying statistical distributions for the fluxes of extragalactic sources and investigate the sensitivities of current (IceCube) and future (IceCube-Gen2 and KM3NeT) experiments. The angular power spectrum is a powerful probe to assess the angular characteristics of neutrino data and we can already constrain rare and bright sources with current IceCube data. In addition, decaying and annihilating very heavy dark matter is a potential neutrino source, as suggested by the observed excess in the High-Energy Starting Event dataset. We apply an angular power spectrum analysis to HESE data for different dark matter models, allowing us to interpret the observed neutrino sky and perform a sensitivity forecast.
Modular invariance approach to masses and mixing of neutrino flavors
Authors: Tanimoto Morimitsu 
Published: March 2020

Abstract
We discuss the phenomenological implications of the modular symmetry Γ(3) ≃ A
4 of lepton flavors. The mass matrices of neutrinos and charged leptons are given by fixing the modulus τ, which is the only source of the breaking of the modular invariance.
Relic neutrino clustering in the Milky Way
Authors: de Salas Pablo F. 
Published: March 2020

Abstract
The Standard Cosmological Model predicts the existence of relic neutrinos, which are indirectly probed through the effective number of relativistic species in the early Universe. In addition, from neutrino flavour oscillations we know that at least two of the neutrino mass states have a non-zero mass. Since the expansion of the Universe has diluted the energy of relic neutrinos, those that are massive are also non relativistic today. This means that they can be trapped in strong gravitational potentials, such as the one of the Milky Way. We review the calculation of the local overdensity of relic neutrinos produced from the gravitational attraction of our Galaxy, Andromeda and the Virgo cluster, commenting on the implications for an experiment aiming at relic neutrino detection, such as the PTOLEMY project.
Pre-supernova neutrino emission from massive stars and their detection
Authors: Kato Chinami , Nagakura Hiroki , Furusawa Shun , Takahashi Koh , Umeda Hideyuki , Yoshida Takashi , Ishidoshiro Koji , Yamada Shoichi 
Published: March 2020

Abstract
Recent progress of neutrino detectors makes it possible to detect pre-SN neutrinos, which are emitted from the core of massive stars before supernova explosions. Pre-SN neutrino observations will become an alarm for supernovae. We hence calculate the number luminosity and energy spectra of pre-SN neutrinos from the 15 M
⊙ progenitor based on the state-of-the-art calculations of massive stars. We find that the number luminosity of ve
’s is

L
N
v

∼

10

55

,

10

57

s

−
1

before core collapse and core bounce, respectively, whereas that of

v
¯

e

’s becomes largest around core collapse

L
N
v

∼

10

53

s

−
1

. We then estimate the number of neutrino events at neutrino detectors taking neutrino oscillations into the obtained luminosities and spectra. We find that an alarm is issued a few days before the explosion by detecting

v
¯

e

’s at liquid-scintilation type detectors if the progenitor is located at 200 pc. Finally, we perform a systematic study of pre-SN neutrino emission for 7 progenitor models with different initial masses. We find that the difference of the number luminosities is ~ 1 order and the dependence of the initial mass have to be taken into the theoretical predictions of pre-SN neutrino observations.
Entropy production from decay of GeV scale right-handed neutrinos and the primordial gravitational wave
Authors: Okui Hisashi 
Published: March 2020

Abstract
Right-handed neutrinos are attractive particles beyond the standard model introduced in the seesaw mechanism [1] that can explain tiny neutrino masses. We revisit the entropy production from the decay of right-handed neutrinos with GeV scale masses. This additional entropy production dilutes the dark matter and baryon abundances. Furthermore, we point out that it gives the effect on the primordial gravitational wave spectrum. Primordial gravitational waves are closely related to the thermal history of the universe, and then the modified history by right-handed neutrino is imprinted in the gravitational wave spectrum12.
Statistical methods in sterile neutrino experiments
Authors: Neumair Birgit , Agostini Matteo 
Published: March 2020

Abstract
We compare the current statistical methods applied to short-baseline neutrino oscillation experiments looking for light sterile neutrinos. The interpretation of the reconstructed confidence regions differs because of the different definition of the alternative hypothesis in the hypothesis test. When the alternative hypothesis extends over the whole physical allowed parameter space of the oscillation parameters, proper confidence regions are obtained both in case of a limit and a signal. Since the different definition of the alternative hypothesis prevents from a direct comparison of the results, a standardized analysis is proposed.
Hunting keV sterile neutrinos with KATRIN: building the first TRISTAN module
Authors: Houdy T , Alborini A , Altenmüller K , Biassoni M , Bombelli L , Brunst T , Carminati M , Descher M , Fink D , Fiorini C , Gugiatti M , Huber A , King P , Korzeczek M , Lebert M , Lechner P , Mertens S , Pavan M , Pozzi S , Radford D C , Sedlak A , Siegmann D , Urban K , Wolf J 
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. The collaboration has reported a first mass measurement result at this TAUP-2019 conference. The TRISTAN project aims at detecting a keV-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 while maintaining a good energy resolution. Therefore, a novel multi-pixel silicon drift detector and read-out system are being designed to handle rates of about 100 Mcps with an energy resolution better than 300 eV (FWHM). This report presents succinctly the KATRIN experiment, the TRISTAN project, then the results of the first 7-pixels prototype measurement campaign and finally describes the construction of the first TRISTAN module composed of 166 SDD-pixels as well as its implementation in KATRIN experiment.
Analysis strategies and treatment of systematic effects in the KATRIN experiment
Authors: Slezák Martin 
Published: March 2020

Abstract
The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to search for the effective electron antineutrino mass with a sensitivity of 0.2 eV/c2 (90% C.L.) from the shape of the tritium β-decay electron energy spectrum. The first measurement campaign in KATRIN dedicated to the neutrino mass took place in spring 2019 with about 22 % of the nominal tritium activity. The goal of this pilot measurement was to reach a sensitivity competitive with past results while establishing a robust bias-free analysis and good initial understanding of systematic effects. Several different analysis techniques were developed independently and cross-checked on a set of fake Monte Carlo prior to real spectra. In this paper, I present an overview of the KATRIN analysis strategies and discuss their applications on the tritium spectra. The treatment of systematic effects is also discussed in detail. I conclude with a short outlook for the future neutrino mass measurement campaigns with KATRIN.