Browsing by Author "M. Agartioglu"

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Bulk and surface event identification in p-type germanium detectors
(Elsevier B.V., 2018) L.T. Yang; H.B. Li; H.T. Wong; M. Agartioglu; J.H. Chen; L.P. Jia; H. Jiang; J. Li; F.K. Lin; S.T. Lin; S.K. Liu; J.L. Ma; B. Sevda; V. Sharma; L. Singh; M.K. Singh; M.K. Singh; A.K. Soma; A. Sonay; S.W. Yang; L. Wang; Q. Wang; Q. Yue; W. Zhao
The p-type point-contact germanium detectors have been adopted for light dark matter WIMP searches and the studies of low energy neutrino physics. These detectors exhibit anomalous behavior to events located at the surface layer. The previous spectral shape method to identify these surface events from the bulk signals relies on spectral shape assumptions and the use of external calibration sources. We report an improved method in separating them by taking the ratios among different categories of in situ event samples as calibration sources. Data from CDEX-1 and TEXONO experiments are re-examined using the ratio method. Results are shown to be consistent with the spectral shape method. © 2018 Elsevier B.V.
Characterization and performance of germanium detectors with sub-keV sensitivities for neutrino and dark matter experiments
(Elsevier B.V., 2016) A.K. Soma; M.K. Singh; L. Singh; G. Kiran Kumar; F.K. Lin; Q. Du; H. Jiang; S.K. Liu; J.L. Ma; V. Sharma; L. Wang; Y.C. Wu; L.T. Yang; W. Zhao; M. Agartioglu; G. Asryan; Y.Y. Chang; J.H. Chen; Y.C. Chuang; M. Deniz; C.L. Hsu; Y.H. Hsu; T.R. Huang; L.P. Jia; S. Kerman; H.B. Li; J. Li; F.T. Liao; H.Y. Liao; C.W. Lin; S.T. Lin; V. Marian; X.C. Ruan; B. Sevda; Y.T. Shen; M.K. Singh; V. Singh; A. Sonay; J. Su; V.S. Subrahmanyam; C.H. Tseng; J.J. Wang; H.T. Wong; Y. Xu; S.W. Yang; C.X. Yu; Q. Yue; M. Zeyrek
Germanium ionization detectors with sensitivities as low as 100 eVee (electron-equivalent energy) open new windows for studies on neutrino and dark matter physics. The relevant physics subjects are summarized. The detectors have to measure physics signals whose amplitude is comparable to that of pedestal electronic noise. To fully exploit this new detector technique, various experimental issues including quenching factors, energy reconstruction and calibration, signal triggering and selection as well as evaluation of their associated efficiencies have to be attended. The efforts and results of a research program to address these challenges are presented. © 2016 Elsevier B.V.
Constraints on millicharged particles with low-threshold germanium detectors at Kuo-Sheng Reactor Neutrino Laboratory
(American Physical Society, 2019) L. Singh; J.W. Chen; H.C. Chi; C.-P. Liu; M.K. Pandey; H.T. Wong; C.P. Wu; M. Agartioglu; M. Deniz; H.B. Li; S.T. Lin; V. Sharma; M.K. Singh; V. Singh; Q. Yue
Relativistic millicharged particles (χq) have been proposed in various extensions to the standard model of particle physics. We consider the scenarios where they are produced at nuclear reactor core and via interactions of cosmic rays with the Earth's atmosphere. Millicharged particles could also be candidates for dark matter and become relativistic through acceleration by supernova explosion shock waves. The atomic ionization cross section of χq with matter are derived with the equivalent photon approximation. Smoking-gun signatures with significant enhancement in the differential cross section are identified. New limits on the mass and charge of χq are derived, using data taken with a point-contact germanium detector with 500 g mass functioning at an energy threshold of 300 eV at the Kuo-Sheng Reactor Neutrino Laboratory. .
Constraints on nonstandard intermediate boson exchange models from neutrino-electron scattering
(American Physical Society, 2017) B. Sevda; A. Şen; M. Demirci; M. Deniz; M. Agartioglu; A. Ajjaq; S. Kerman; L. Singh; A. Sonay; H.T. Wong; M. Zeyrek
Constraints on couplings of several beyond-Standard-Model-physics scenarios, mediated by massive intermediate particles including (1) an extra Z-prime, (2) a new light spin-1 boson, and (3) a charged Higgs boson, are placed via the neutrino-electron scattering channel to test the Standard Model at a low energy-momentum transfer regime. Data on νe-e and νe-e scattering from the TEXONO and LSND, respectively, are used. Upper bounds to coupling constants of the flavor-conserving and flavor-violating new light spin-1 boson and the charged Higgs boson with respect to different mediator masses are determined. The relevant parameter spaces are extended by allowing light mediators. New lower mass limits for extra Z-prime gauge boson models are also placed. © 2017 American Physical Society.
Constraints on Spin-Independent Nucleus Scattering with sub-GeV Weakly Interacting Massive Particle Dark Matter from the CDEX-1B Experiment at the China Jinping Underground Laboratory
(American Physical Society, 2019) Z.Z. Liu; Q. Yue; L.T. Yang; K.J. Kang; Y.J. Li; H.T. Wong; M. Agartioglu; H.P. An; J.P. Chang; J.H. Chen; Y.H. Chen; J.P. Cheng; Z. Deng; Q. Du; H. Gong; X.Y. Guo; Q.J. Guo; L. He; S.M. He; J.W. Hu; Q.D. Hu; H.X. Huang; L.P. Jia; H. Jiang; H.B. Li; H. Li; J.M. Li; J. Li; X. Li; X.Q. Li; Y.L. Li; B. Liao; F.K. Lin; S.T. Lin; S.K. Liu; Y.D. Liu; Y.Y. Liu; H. Ma; J.L. Ma; Y.C. Mao; J.H. Ning; H. Pan; N.C. Qi; J. Ren; X.C. Ruan; V. Sharma; Z. She; L. Singh; M.K. Singh; T.X. Sun; C.J. Tang; W.Y. Tang; Y. Tian; G.F. Wang; L. Wang; Q. Wang; Y. Wang; Y.X. Wang; S.Y. Wu; Y.C. Wu; H.Y. Xing; Y. Xu; T. Xue; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; M. Zeng; Z. Zeng; F.S. Zhang; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu
We report results on the searches of weakly interacting massive particles (WIMPs) with sub-GeV masses (mχ) via WIMP-nucleus spin-independent scattering with Migdal effect incorporated. Analysis on time-integrated (TI) and annual modulation (AM) effects on CDEX-1B data are performed, with 737.1 kg day exposure and 160 eVee threshold for TI analysis, and 1107.5 kg day exposure and 250 eVee threshold for AM analysis. The sensitive windows in mχ are expanded by an order of magnitude to lower DM masses with Migdal effect incorporated. New limits on σχNSI at 90% confidence level are derived as 2×10-32∼7×10-35 cm2 for TI analysis at mχ∼50-180 MeV/c2, and 3×10-32∼9×10-38 cm2 for AM analysis at mχ∼75 MeV/c2-3.0 GeV/c2. .
Constraints on sub-GeV dark matter boosted by cosmic rays from the CDEX-10 experiment at the China Jinping Underground Laboratory
(American Physical Society, 2022) R. Xu; L.T. Yang; Q. Yue; K.J. Kang; Y.J. Li; M. Agartioglu; H.P. An; J.P. Chang; Y.H. Chen; J.P. Cheng; W.H. Dai; Z. Deng; C.H. Fang; X.P. Geng; H. Gong; X.Y. Guo; Q.J. Guo; L. He; S.M. He; J.W. Hu; H.X. Huang; T.C. Huang; H.T. Jia; X. Jiang; H.B. Li; J.M. Li; J. Li; Q.Y. Li; R.M.J. Li; X.Q. Li; Y.L. Li; Y.F. Liang; B. Liao; F.K. Lin; S.T. Lin; S.K. Liu; Y. Liu; Y.D. Liu; Y.Y. Liu; Z.Z. Liu; H. Ma; Y.C. Mao; Q.Y. Nie; J.H. Ning; H. Pan; N.C. Qi; J. Ren; X.C. Ruan; K. Saraswat; V. Sharma; Z. She; M.K. Singh; T.X. Sun; C.J. Tang; W.Y. Tang; Y. Tian; G.F. Wang; L. Wang; Q. Wang; Y. Wang; Y.X. Wang; H.T. Wong; S.Y. Wu; Y.C. Wu; H.Y. Xing; Y. Xu; T. Xue; Y.L. Yan; C.H. Yeh; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; M. Zeng; Z. Zeng; B.T. Zhang; F.S. Zhang; L. Zhang; Z.H. Zhang; Z.Y. Zhang; K.K. Zhao; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu
We present new constraints on light dark matter boosted by cosmic rays (CRDM) using the 205.4 kg day data of the CDEX-10 experiment conducted at the China Jinping Underground Laboratory. The Monte Carlo simulation package cjpl_ess was employed to evaluate the Earth shielding effect. Several key factors have been introduced and discussed in our CRDM analysis, including the contributions from heavier CR nuclei than proton and helium, the inhomogeneity of CR distribution, and the impact of the form factor in the Earth attenuation calculation. Our result excludes the dark matter-nucleon elastic scattering cross section region from 1.7×10-30 to 10-26 cm2 for dark matter of 10 keV/c2 to 1 GeV/c2. © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
Constraints on Sub-GeV Dark Matter-Electron Scattering from the CDEX-10 Experiment
(American Physical Society, 2022) Z.Y. Zhang; L.T. Yang; Q. Yue; K.J. Kang; Y.J. Li; M. Agartioglu; H.P. An; J.P. Chang; Y.H. Chen; J.P. Cheng; W.H. Dai; Z. Deng; C.H. Fang; X.P. Geng; H. Gong; Q.J. Guo; X.Y. Guo; L. He; S.M. He; J.W. Hu; H.X. Huang; T.C. Huang; H.T. Jia; X. Jiang; H.B. Li; J.M. Li; J. Li; Q.Y. Li; R.M.J. Li; X.Q. Li; Y.L. Li; Y.F. Liang; B. Liao; F.K. Lin; S.T. Lin; S.K. Liu; Y.D. Liu; Y. Liu; Y.Y. Liu; Z.Z. Liu; H. Ma; Y.C. Mao; Q.Y. Nie; J.H. Ning; H. Pan; N.C. Qi; J. Ren; X.C. Ruan; K. Saraswat; V. Sharma; Z. She; M.K. Singh; T.X. Sun; C.J. Tang; W.Y. Tang; Y. Tian; G.F. Wang; L. Wang; Q. Wang; Y. Wang; Y.X. Wang; H.T. Wong; S.Y. Wu; Y.C. Wu; H.Y. Xing; R. Xu; Y. Xu; T. Xue; Y.L. Yan; C.H. Yeh; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; M. Zeng; Z. Zeng; B.T. Zhang; F.S. Zhang; L. Zhang; Z.H. Zhang; K.K. Zhao; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu
We present improved germanium-based constraints on sub-GeV dark matter via dark matter-electron (?-e) scattering using the 205.4 kg·day dataset from the CDEX-10 experiment. Using a novel calculation technique, we attain predicted ?-e scattering spectra observable in high-purity germanium detectors. In the heavy mediator scenario, our results achieve 3 orders of magnitude of improvement for m? larger than 80 MeV/c2 compared to previous germanium-based ?-e results. We also present the most stringent ?-e cross-section limit to date among experiments using solid-state detectors for m? larger than 90 MeV/c2 with heavy mediators and m? larger than 100 MeV/c2 with electric dipole coupling. The result proves the feasibility and demonstrates the vast potential of a new ?-e detection method with high-purity germanium detectors in ultralow radioactive background. © 2022 authors. Published by the American Physical Society.
Differentiation of bulk and surface events in p-type point-contact germanium detectors for light WIMP searches
(Elsevier, 2014) H.B. Li; L. Singh; M.K. Singh; A.K. Soma; C.H. Tseng; S.W. Yang; M. Agartioglu; G. Asryan; Y.C. Chuang; M. Deniz; T.R. Huang; G. Kiran Kumar; J. Li; H.Y. Liao; F.K. Lin; S.T. Lin; S.K. Liu; V. Sharma; Y.T. Shen; V. Singh; H.T. Wong; Y.C. Wu; Y. Xu; C.X. Yu; Q. Yue; W. Zhao
The p-type point-contact germanium detectors are novel techniques offering kg-scale radiation sensors with sub-keV sensitivities. They have been used for light dark matter WIMPs searches and may have potential applications in neutrino physics. There are, however, anomalous surface behaviour which needs to be characterized and understood. We describe the methods and results of a research program whose goals are to identify the bulk and surface events via software pulse shape analysis techniques, and to devise calibration schemes to evaluate the selection efficiency factors. Efficiencies-corrected background spectra from the low-background facility at Kuo-Sheng Neutrino Laboratory are derived. © 2014 Elsevier B.V. All rights reserved.
Direct Detection Constraints on Dark Photons with the CDEX-10 Experiment at the China Jinping Underground Laboratory
(American Physical Society, 2020) Z. She; L.P. Jia; Q. Yue; H. Ma; K.J. Kang; Y.J. Li; M. Agartioglu; H.P. An; J.P. Chang; J.H. Chen; Y.H. Chen; J.P. Cheng; W.H. Dai; Z. Deng; X.P. Geng; H. Gong; P. Gu; Q.J. Guo; X.Y. Guo; L. He; S.M. He; H.T. He; J.W. Hu; T.C. Huang; H.X. Huang; H.B. Li; H. Li; J.M. Li; J. Li; M.X. Li; X. Li; X.Q. Li; Y.L. Li; B. Liao; F.K. Lin; S.T. Lin; S.K. Liu; Y.D. Liu; Y.Y. Liu; Z.Z. Liu; Y.C. Mao; Q.Y. Nie; J.H. Ning; H. Pan; N.C. Qi; C.K. Qiao; J. Ren; X.C. Ruan; B. Sevda; C.S. Shang; V. Sharma; L. Singh; M.K. Singh; T.X. Sun; C.J. Tang; W.Y. Tang; Y. Tian; G.F. Wang; L. Wang; Q. Wang; Y. Wang; Y.X. Wang; Z. Wang; H.T. Wong; S.Y. Wu; H.Y. Xing; Y. Xu; T. Xue; Y.L. Yan; L.T. Yang; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; M. Zeng; Z. Zeng; B.T. Zhang; L. Zhang; F.S. Zhang; Z.Y. Zhang; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu
We report constraints on the dark photon effective kinetic mixing parameter (κ) with data taken from two p-type point-contact germanium detectors of the CDEX-10 experiment at the China Jinping Underground Laboratory. The 90% confidence level upper limits on κ of solar dark photon from 205.4 kg-day exposure are derived, probing new parameter space with masses (mV) from 10 to 300 eV/c2 in direct detection experiments. Considering dark photon as the cosmological dark matter, limits at 90% confidence level with mV from 0.1 to 4.0 keV/c2 are set from 449.6 kg-day data, with a minimum of κ=1.3×10-15 at mV=200 eV/c2. © 2020 authors. Published by the American Physical Society.
Limits on Light Weakly Interacting Massive Particles from the First 102.8 kg×day Data of the CDEX-10 Experiment
(American Physical Society, 2018) H. Jiang; L.P. Jia; Q. Yue; K.J. Kang; J.P. Cheng; Y.J. Li; H.T. Wong; M. Agartioglu; H.P. An; J.P. Chang; J.H. Chen; Y.H. Chen; Z. Deng; Q. Du; H. Gong; L. He; J.W. Hu; Q.D. Hu; H.X. Huang; H.B. Li; H. Li; J.M. Li; J. Li; X. Li; X.Q. Li; Y.L. Li; B. Liao; F.K. Lin; S.T. Lin; S.K. Liu; Y.D. Liu; Y.Y. Liu; Z.Z. Liu; H. Ma; J.L. Ma; H. Pan; J. Ren; X.C. Ruan; B. Sevda; V. Sharma; M.B. Shen; L. Singh; M.K. Singh; T.X. Sun; C.J. Tang; W.Y. Tang; Y. Tian; G.F. Wang; J.M. Wang; L. Wang; Q. Wang; Y. Wang; S.Y. Wu; Y.C. Wu; H.Y. Xing; Y. Xu; T. Xue; L.T. Yang; S.W. Yang; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; X.H. Zeng; M. Zeng; Z. Zeng; F.S. Zhang; Y.H. Zhang; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu; Z.H. Zhu
We report the first results of a light weakly interacting massive particles (WIMPs) search from the CDEX-10 experiment with a 10 kg germanium detector array immersed in liquid nitrogen at the China Jinping Underground Laboratory with a physics data size of 102.8 kg day. At an analysis threshold of 160 eVee, improved limits of 8×10-42 and 3×10-36 cm2 at a 90% confidence level on spin-independent and spin-dependent WIMP-nucleon cross sections, respectively, at a WIMP mass (mχ) of 5 GeV/c2 are achieved. The lower reach of mχ is extended to 2 GeV/c2. © 2018 authors. Published by the American Physical Society.
Neutron background measurements with a hybrid neutron detector at the Kuo-Sheng Reactor Neutrino Laboratory
(American Physical Society, 2018) A. Sonay; M. Deniz; H.T. Wong; M. Agartioglu; G. Asryan; J.H. Chen; S. Kerman; H.B. Li; J. Li; F.K. Lin; S.T. Lin; B. Sevda; V. Sharma; L. Singh; M.K. Singh; M.K. Singh; V. Singh; A.K. Soma; S.W. Yang; Q. Yue; I.O. Ylldlrlm; M. Zeyrek
We report in situ neutron background measurements at the Kuo-Sheng Reactor Neutrino Laboratory (KSNL) by a hybrid neutron detector (HND) with a data size of 33.8 days under shielding configurations identical to those used during the neutrino physics data taking. The HND consists of BC-501A liquid and BC-702 phosphor powder scintillation neutron detectors, which are sensitive to both fast and thermal neutrons, respectively. Neutron-induced events for the two channels are identified and differentiated by pulse shape analysis, such that the backgrounds of both are simultaneously measured. The fast neutron fluxes are derived by an iterative unfolding algorithm. Neutron-induced backgrounds in the germanium detector under the same fluxes, due to both cosmic rays and ambient radioactivity, are derived and compared with the measurements. The results are valuable to background understanding of the neutrino data at the KSNL. In particular, neutron-induced background events due to ambient radioactivity as well as from reactor operation are negligible compared to intrinsic cosmogenic activity and ambient γ activity. The detector concept and analysis procedures are applicable to neutron background characterization in similar rare-event experiments. © 2018 American Physical Society.
Search for Light Weakly-Interacting-Massive-Particle Dark Matter by Annual Modulation Analysis with a Point-Contact Germanium Detector at the China Jinping Underground Laboratory
(American Physical Society, 2019) L.T. Yang; H.B. Li; Q. Yue; H. Ma; K.J. Kang; Y.J. Li; H.T. Wong; M. Agartioglu; H.P. An; J.P. Chang; J.H. Chen; Y.H. Chen; J.P. Cheng; Z. Deng; Q. Du; H. Gong; Q.J. Guo; L. He; J.W. Hu; Q.D. Hu; H.X. Huang; L.P. Jia; H. Jiang; H. Li; J.M. Li; J. Li; X. Li; X.Q. Li; Y.L. Li; B. Liao; F.K. Lin; S.T. Lin; S.K. Liu; Y.D. Liu; Y.Y. Liu; Z.Z. Liu; J.L. Ma; Y.C. Mao; H. Pan; J. Ren; X.C. Ruan; V. Sharma; Z. She; M.B. Shen; L. Singh; M.K. Singh; T.X. Sun; C.J. Tang; W.Y. Tang; Y. Tian; G.F. Wang; J.M. Wang; L. Wang; Q. Wang; Y. Wang; Y.X. Wang; S.Y. Wu; Y.C. Wu; H.Y. Xing; Y. Xu; T. Xue; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; X.H. Zeng; M. Zeng; Z. Zeng; F.S. Zhang; Y.H. Zhang; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu; Z.H. Zhu
We present results on light weakly interacting massive particle (WIMP) searches with annual modulation (AM) analysis on data from a 1-kg mass p-type point-contact germanium detector of the CDEX-1B experiment at the China Jinping Underground Laboratory. Datasets with a total live time of 3.2 yr within a 4.2-yr span are analyzed with analysis threshold of 250 eVee. Limits on WIMP-nucleus (χ-N) spin-independent cross sections as function of WIMP mass (mχ) at 90% confidence level (C.L.) are derived using the dark matter halo model. Within the context of the standard halo model, the 90% C.L. allowed regions implied by the DAMA/LIBRA and CoGeNT AM-based analysis are excluded at >99.99% and 98% C.L., respectively. These results correspond to the best sensitivity at mχ<6 GeV/c2 among WIMP AM measurements to date. © 2019 authors. Published by the American Physical Society.
Search for neutrinoless double-beta decay of Ge 76 with a natural broad energy germanium detector
(American Physical Society, 2022) W.H. Dai; H. Ma; Q. Yue; Z. She; K.J. Kang; Y.J. Li; M. Agartioglu; H.P. An; J.P. Chang; Y.H. Chen; J.P. Cheng; Z. Deng; C.H. Fang; X.P. Geng; H. Gong; Q.J. Guo; X.Y. Guo; L. He; S.M. He; J.W. Hu; H.X. Huang; T.C. Huang; H.T. Jia; X. Jiang; H.B. Li; J.M. Li; J. Li; Q.Y. Li; R.M.J. Li; X.Q. Li; Y.L. Li; Y.F. Liang; B. Liao; F.K. Lin; S.T. Lin; S.K. Liu; Y.D. Liu; Y. Liu; Y.Y. Liu; Z.Z. Liu; Y.C. Mao; Q.Y. Nie; J.H. Ning; H. Pan; N.C. Qi; J. Ren; X.C. Ruan; K. Saraswat; V. Sharma; M.K. Singh; T.X. Sun; C.J. Tang; W.Y. Tang; Y. Tian; G.F. Wang; L. Wang; Q. Wang; Y. Wang; Y.X. Wang; H.T. Wong; S.Y. Wu; Y.C. Wu; H.Y. Xing; R. Xu; Y. Xu; T. Xue; Y.L. Yan; L.T. Yang; C.H. Yeh; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; M. Zeng; Z. Zeng; B.T. Zhang; F.S. Zhang; L. Zhang; Z.H. Zhang; Z.Y. Zhang; K.K. Zhao; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu
A natural broad energy germanium detector is operated in the China Jinping Underground Laboratory for a feasibility study of building the next generation experiment of the neutrinoless double-beta (0νββ) decay of Ge76. The setup of the prototype facility, characteristics of the broad energy germanium detector, background reduction methods, and data analysis are described in this paper. A background index of 6.4×10-3 counts/(keV kg day) is achieved and 1.86 times lower than our previous result of the CDEX-1 detector. No signal is observed with an exposure of 186.4 kg day, thus a limit on the half life of Ge76 0νββ decay is set at T1/20ν>5.62×1022 yr at 90% C.L. The limit corresponds to an effective Majorana neutrino mass in the range of 4.6-10.3 eV, dependent on the nuclear matrix elements. © 2022 American Physical Society.
Studies of quantum-mechanical coherency effects in neutrino-nucleus elastic scattering
(American Physical Society, 2021) V. Sharma; L. Singh; H.T. Wong; M. Agartioglu; J.-W. Chen; M. Deniz; S. Kerman; H.B. Li; C.-P. Liu; K. Saraswat; M.K. Singh; V. Singh
Neutrino-nucleus elastic scattering (νAel) provides a unique laboratory to study the quantum-mechanical (QM) coherency effects in electroweak interactions. The deviations of the cross sections from those of completely coherent systems can be quantitatively characterized through a coherency parameter α(q2). The relations between α and the underlying nuclear physics in terms of nuclear form factors are derived. The dependence of cross section on α(q2) for the various neutrino sources is presented. The α(q2) values are evaluated from the measured data of the COHERENT CsI and Ar experiments. Complete coherency and decoherency conditions are excluded by the CsI data with p=0.004 at q2=3.1×103 MeV2 and p=0.016 at q2=2.3×103 MeV2, respectively, verifying that both QM superpositions and nuclear many-body effects contribute to νAel interactions. © 2021 authors. Published by the American Physical Society.
Studies of the Earth shielding effect to direct dark matter searches at the China Jinping Underground Laboratory
(American Physical Society, 2022) Z.Z. Liu; L.T. Yang; Q. Yue; C.H. Yeh; K.J. Kang; Y.J. Li; M. Agartioglu; H.P. An; J.P. Chang; J.H. Chen; Y.H. Chen; J.P. Cheng; W.H. Dai; Z. Deng; C.H. Fang; X.P. Geng; H. Gong; X.Y. Guo; Q.J. Guo; L. He; S.M. He; J.W. Hu; H.X. Huang; T.C. Huang; H.T. Jia; X. Jiang; H.B. Li; J.M. Li; J. Li; R.M.J. Li; X.Q. Li; Y.L. Li; B. Liao; F.K. Lin; S.T. Lin; S.K. Liu; Y. Liu; Y.D. Liu; Y.Y. Liu; H. Ma; Y.C. Mao; Q.Y. Nie; J.H. Ning; H. Pan; N.C. Qi; J. Ren; X.C. Ruan; V. Sharma; Z. She; K. Saraswat; M.K. Singh; T.X. Sun; C.J. Tang; W.Y. Tang; Y. Tian; G.F. Wang; L. Wang; Q. Wang; Y. Wang; Y.X. Wang; Z. Wang; H.T. Wong; S.Y. Wu; Y.C. Wu; H.Y. Xing; Y. Xu; T. Xue; Y.L. Yan; N. Yi; C.X. Yu; H.J. Yu; J.F. Yue; M. Zeng; Z. Zeng; B.T. Zhang; F.S. Zhang; K.K. Zhang; Z.H. Zhang; Z.Y. Zhang; M.G. Zhao; J.F. Zhou; Z.Y. Zhou; J.J. Zhu
Dark matter direct detection experiments mostly operate at deep underground laboratories. It is necessary to consider shielding effect of the Earth, especially for dark matter particles interacting with a large cross section. We analyzed and simulated the Earth shielding effect for dark matter at the China Jinping Underground Laboratory (CJPL) with a simulation package, CJPL Earth Shielding Simulation code (CJPL_ESS), which is applicable to other underground locations. The further constraints on the χ-N cross section exclusion regions are derived based on the studies with CDEX experiment data. © 2022 authors. Published by the American Physical Society.
The large enriched germanium experiment for neutrinoless double beta decay (LEGEND)
(American Institute of Physics Inc., 2017) N. Abgrall; A. Abramov; N. Abrosimov; I. Abt; M. Agostini; M. Agartioglu; A. Ajjaq; S.I. Alvis; F.T. Avignone; X. Bai; M. Balata; I. Barabanov; A.S. Barabash; P.J. Barton; L. Baudis; L. Bezrukov; T. Bode; A. Bolozdynya; D. Borowicz; A. Boston; H. Boston; S.T.P. Boyd; R. Breier; V. Brudanin; R. Brugnera; M. Busch; M. Buuck; A. Caldwell; T.S. Caldwell; T. Camellato; M. Carpenter; C. Cattadori; J. Cederkäll; Y.-D. Chan; S. Chen; A. Chernogorov; C.D. Christofferson; P.-H. Chu; R.J. Cooper; C. Cuesta; E.V. Demidova; Z. Deng; M. Deniz; J.A. Detwiler; N. Di Marco; A. Domula; Q. Du; Yu. Efremenko; V. Egorov; S.R. Elliott; D. Fields; F. Fischer; A. Galindo-Uribarri; A. Gangapshev; A. Garfagnini; T. Gilliss; M. Giordano; G.K. Giovanetti; M. Gold; P. Golubev; C. Gooch; P. Grabmayr; M.P. Green; J. Gruszko; I.S. Guinn; V.E. Guiseppe; V. Gurentsov; Y. Gurov; K. Gusev; J. Hakenmüeller; L. Harkness-Brennan; Z.R. Harvey; C.R. Haufe; L. Hauertmann; D. Heglund; L. Hehn; A. Heinz; R. Hiller; J. Hinton; R. Hodak; W. Hofmann; S. Howard; M.A. Howe; M. Hult; L.V. Inzhechik; J. Janicskó Csáthy; R. Janssens; M. Ješkovský; J. Jochum; H.T. Johansson; D. Judson; M. Junker; J. Kaizer; K. Kang; V. Kazalov; Y. Kermadic; F. Kiessling; A. Kirsch; A. Kish; A. Klimenko; K.T. Knöpfle; O. Kochetov; S.I. Konovalov; I. Kontul; V.N. Kornoukhov; T. Kraetzschmar; K. Kröninger; A. Kumar; V.V. Kuzminov; K. Lang; M. Laubenstein; A. Lazzaro; Y.L. Li; Y.-Y. Li; H.B. Li; S.T. Lin; M. Lindner; I. Lippi; S.K. Liu; X. Liu; J. Liu; D. Loomba; A. Lubashevskiy; B. Lubsandorzhiev; G. Lutter; H. Ma; B. Majorovits; F. Mamedov; R.D. Martin; R. Massarczyk; J.A.J. Matthews; N. McFadden; D.-M. Mei; H. Mei; S.J. Meijer; D. Mengoni; S. Mertens; W. Miller; M. Miloradovic; R. Mingazheva; M. Misiaszek; P. Moseev; J. Myslik; I. Nemchenok; T. Nilsson; P. Nolan; C. O'Shaughnessy; G. Othman; K. Panas; L. Pandola; L. Papp; K. Pelczar; D. Peterson; W. Pettus; A.W.P. Poon; P.P. Povinec; A. Pullia; X.C. Quintana; D.C. Radford; J. Rager; C. Ransom; F. Recchia; A.L. Reine; S. Riboldi; K. Rielage; S. Rozov; N.W. Rouf; E. Rukhadze; N. Rumyantseva; R. Saakyan; E. Sala; F. Salamida; V. Sandukovsky; G. Savard; S. Schönert; A.-K. Schütz; O. Schulz; M. Schuster; B. Schwingenheuer; O. Selivanenko; B. Sevda; B. Shanks; E. Shevchik; M. Shirchenko; F. Simkovic; L. Singh; V. Singh; M. Skorokhvatov; K. Smolek; A. Smolnikov; A. Sonay; M. Spavorova; I. Stekl; D. Stukov; D. Tedeschi; J. Thompson; T. Van Wechel; R.L. Varner; A.A. Vasenko; S. Vasilyev; A. Veresnikova; K. Vetter; K. Von Sturm; K. Vorren; M. Wagner; G.-J. Wang; D. Waters; W.-Z. Wei; T. Wester; B.R. White; C. Wiesinger; J.F. Wilkerson; M. Willers; C. Wiseman; M. Wojcik; H.T. Wong; J. Wyenberg; W. Xu; E. Yakushev; G. Yang; C.-H. Yu; Q. Yue; V. Yumatov; J. Zeman; Z. Zeng; I. Zhitnikov; B. Zhu; D. Zinatulina; A. Zschocke; A.J. Zsigmond; K. Zuber; G. Zuzel
The observation of neutrinoless double-beta decay (0νββ) would show that lepton number is violated, reveal that neu-trinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 - 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely low backgrounds, at the level of ∼0.1 count /(FWHM·t·yr) in the region of the signal. The current generation 76Ge experiments GERDA and the Majorana Demonstrator, utilizing high purity Germanium detectors with an intrinsic energy resolution of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in the 0νββ signal region of all 0νββ experiments. Building on this success, the LEGEND collaboration has been formed to pursue a tonne-scale 76Ge experiment. The collaboration aims to develop a phased 0νββ experimental program with discovery potential at a half-life approaching or at 1028 years, using existing resources as appropriate to expedite physics results. © 2017 Author(s).