Scholarly Publications
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This community showcases the academic contributions of faculty and researchers at Banaras Hindu University (BHU) and provides a year-wise compilation of publications across disciplines. Institutional Repository BHU
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PublicationArticle 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. ZhaoThe 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.PublicationArticle 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. ZeyrekGermanium 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.PublicationArticle 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. ZhaoThe 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.PublicationArticle Neutrino and dark matter physics with sub-keV germanium detectors(Springer, 2014) Arun Kumar Soma; Lakhwinder Singh; Manoj Kumar Singh; Venktesh Singh; Henry T. WongGermanium detectors with sub-keV sensitivities open a window to study neutrino physics to search for light weakly interacting massive particle (WIMP) dark matter. We summarize the recent results on spin-independent couplings of light WIMPs from the TEXONO experiment at the Kuo-Sheng Reactor Neutrino Laboratory. Highlights of the physics motivation, our R&D programme, as well as the status and plans are presented. © Indian Academy of SciencesPublicationConference Paper Prospects of dark matter direct search under deep sea water in India(2013) V. Singh; V.S. Subrahmanyam; L. Singh; M.K. Singh; V. Sharma; N.S. Chouhan; M.K. Jaiswal; A.K. SomaThere is compelling evidence from cosmological and astrophysical observations that about one quarter of the energy density of the universe can be attributed to cold dark matter (CDM), whose nature and properties are still unknown. Around the world large numbers of experiments are using different techniques of dark matter direct and indirect detections. According to their experimental requirements location of the experiment prefer to use either underground, under ice, or under sea water. Country like India, digging underground cavern and long tunnel is not very convenient. Therefore, authors look from the either solutions of this problem preferring to use deep sea water. In this article, we discuss the pros and corns of use of deep sea water in the dark matter search. © 2013 AIP Publishing LLC.PublicationConference Paper Low energy neutrino and dark matter physics with sub-keV germanium detectors(2011) L. Singh; A.K. Soma; M.K. Singh; V. Singh; H.T. WongA TEXONO collaboration research program on low energy neutrino and dark matter physics is going on at the Kuo-Sheng Neutrino Laboratory (KSNL). Collaboration main goals are to measure the neutrino-nucleus coherent scattering cross section, neutrino magnetic moments, and the searches of WIMP dark matter. To achieve these goals various prototype detectors and their sub-keV background are under study. A threshold of 220 eV was achieved with prototype detectors at the KSNL. New limits were set for WIMPs with mass between 3-6 GeV. Data are being taken with a 500 g Point Contact Germanium detector, where a threshold of ∼350 eV was demonstrated. A 20 g ULEGe detector is taking data at CJPL in Sichuan, China. © 2011 American Institute of Physics.