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Laboratory for Experimental Nuclear Physics


Title: Synthesis of Titanium Nanoparticles in Liquid Xenon by a High-Voltage Discharge
Authors: D. Yu. Akimov, V. A. Belov, S. V. Bobkov, A. I. Bolozdynya, P. S. Dzhumaev, A. V. Galavanov, Yu. V. Gusakov, D. E. Kdib, A. V. Khromov, M. Yu. Kolpakov, A. M. Konovalov, A. G. Kovalenko, E. S. Kozlova, A. V. Kumpan, A. V. Lukyashin, Yu. A. Melikyan, O. E. Nepochataya, D. G. Rudik, M. Yu. Savinov, A. V. Shakirov, G. E. Simakov, V. V. Sosnovtsev, A. A. Vasin, and N. V. Volkov.
Annotations: The formation of titanium nanoparticles (NPs) in a high-voltage electric discharge between titanium electrodes in liquid xenon at a temperature of –105°C has been observed. It has been shown that these titanium nanoparticles have a spherical shape with an average diameter of < 50 nm and they possess high chemical activity. This makes it possible when a relative mass concentration of NP reaches ~10–6 to efficiently purify xenon from electronegative impurities for its use as a working medium for a new generation of highefficiency nuclear radiation detectors.
Published in: Technical Physics Letters, 2018, Vol. 44, No. 7, pp. 637–639.

Title: Observation of coherent elastic neutrino-nucleus scattering
Authors: D. Akimov, J. B. Albert, P. An, C. Awe, P. S. Barbeau, B. Becker, V. Belov, A. Brown, A. Bolozdynya, B. Cabrera-Palmer, M. Cervantes, J. I. Collar, R. J. Cooper, R. L. Cooper, C. Cuesta, D. J. Dean, J. A. Detwiler, A. Eberhardt, Y. Efremenko, S. R. Elliott, E. M. Erkela, L. Fabris, M. Febbraro, N. E. Fields, W. Fox, Z. Fu, A. Galindo-Uribarri, M. P. Green, M. Hai, M. R. Heath, S. Hedges, D. Hornback, T. W. Hossbach, E. B. Iverson, L. J. Kaufman, S. Ki, S. R. Klein, A. Khromov, A. Konovalov, M. Kremer, A. Kumpan, C. Leadbetter, L. Li, W. Lu, K. Mann, D. M. Markoff, K. Miller, H. Moreno, P. E. Mueller, J. Newby, J. L. Orrell, C. T. Overman, D. S. Parno, S. Penttila, G. Perumpilly, H. Ray, J. Raybern, D. Reyna, G. C. Rich, D. Rimal, D. Rudik, K. Scholberg, B. J. Scholz, G. Sinev, W. M. Snow, V. Sosnovtsev, A. Shakirov, S. Suchyta, B. Suh, R. Tayloe, R. T. Thornton, I. Tolstukhin, J. Vanderwerp, R. L. Varner, C. J. Virtue, Z. Wan, J. Yoo, C.-H. Yu, A. Zawada, J. Zettlemoyer, A. M. Zderic, COHERENT Collaboration.
Annotations: The coherent elastic scattering of neutrinos off nuclei has eluded detection for four decades, even though its predicted cross-section is the largest by far of all low-energy neutrino couplings. This mode of interaction provides new opportunities to study neutrino properties, and leads to a miniaturization of detector size, with potential technological applications. We observe this process at a 6.7-sigma confidence level, using a low-background, 14.6-kg CsI[Na] scintillator exposed to the neutrino emissions from the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory. Characteristic signatures in energy and time, predicted by the Standard Model for this process, are observed in high signal-to-background conditions. Improved constraints on non-standard neutrino interactions with quarks are derived from this initial dataset.
Published in: Science, 10.1126/science.aao0990 (2017).

Title: First results from the LUX dark matter experiment at the Sanford Underground Research Facility
Authors: LUX Collaboration: D.S. Akerib, H.M. Araujo, X. Bai, A.J. Bailey, J. Balajthy, S. Bedikian, E. Bernard, A. Bernstein, A.Bolozdynya et al
Annotations: The Large Underground Xenon (LUX) experiment, a dual-phase xenon time-projection chamber operating at the Sanford Underground Research Facility (Lead, South Dakota), was cooled and filled in February 2013. We report results of the first WIMP search dataset, taken during the period April to August 2013, presenting the analysis of 85.3 live-days of data with a fiducial volume of 118 kg. A profile-likelihood analysis technique shows our data to be consistent with the background-only hypothesis, allowing 90% confidence limits to be set on spin-independent WIMP-nucleon elastic scattering with a minimum upper limit on the cross section of 7.6×10 −46 cm2 at a WIMP mass of 33 GeV/c2. We find that the LUX data are in strong disagreement with low-mass WIMP signal interpretations of the results from several recent direct detection experiments.
Published in: e-print, 1 Oct. 2013, 11 pp.

Title: Coherent Scattering Investigations at the Spallation Neutron Source: a Snowmass White Paper
Authors: D. Akimov, A. Bernstein, P. Barbeau, P. Barton, A. Bolozdynya, B. Cabrera-Palmer, F. Cavanna, V. Cianciolo, J. Collar, R.J. Cooper, D. Dean, Y. Efremenko, A. Etenko, N. Fields, M. Foxe, E. Figueroa-Feliciano, N. Fomin, F. Gallmeier, I. Garishvili, M. Gerling, M. Green, G. Greene, A. Hatzikoutelis, R. Henning, R. Hix, D. Hogan, D. Hornback, I. Jovanovic, T. Hossbach, E. Iverson, S.R. Klein, A. Khromov, J. Link, W. Louis, W. Lu, C. Mauger, P. Marleau, D. Markoff, R.D. Martin, P. Mueller, J. Newby, J. Orrell, C. O'Shaughnessy, S. Pentilla, K. Patton, A.W. Poon, D. Radford, D. Reyna, H. Ray, K. Scholberg, V. Sosnovtsev
Annotations: The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, Tennessee, provides an intense flux of neutrinos in the few tens-of-MeV range, with a sharply-pulsed timing structure that is beneficial for background rejection. In this white paper, we describe how the SNS source can be used for a measurement of coherent elastic neutrino-nucleus scattering (CENNS), and the physics reach of different phases of such an experimental program (CSI: Coherent Scattering Investigations at the SNS).
Published in: e-print, 30 Oct. 2013, 18 pp.

Title: Measurement of Single Electron Noise in a Liquid Xenon Emission Detector
Authors: D. Yu. Akimov, I. S. Aleksandrov, V. A. Belov, A. I. Bolozdynya, A. A. Burenkov, Yu. V. Efremenko, M. A. Kirsanov, A. S. Kobyakin, A. G. Kovalenko, A. M. Konovalov, A. V. Kumpan, V. N. Stekhanov
Annotations: A technique for studying single electron noise in emission detectors that are intended for detection of rare processes with small energy releases is developed. Examples of possible applications are experiments for search of dark matter in the Universe and detection of reactor antineutrinos via coherent neutrino scattering at heavy xenon nuclei. We present the first results of studying the nature of single electron noise in a liquid xenon emission detector and consider possible ways to suppress it.
Published in: Instruments and Experimental Techniques, 2012, Vol. 55, No. 4, pp. 423–428

Title: Измерение одноэлектронных шумов в эмиссионном детекторе на жидком ксеноне
Authors: Д. Ю. Акимов, И. С. Александров, В. А. Белов, А. И. Болоздыня, А. А. Буренков, Ю. В. Ефременко, М. А. Кирсанов, А. С. Кобякин, А. Г. Коваленко, А. М. Коновалов, А. В. Кумпан, В. Н. Стеханов
Annotations: Разработана методика исследования одноэлектронных шумов в эмиссионных детекторах, предназначенных для регистрации редких процессов с малыми энерговыделениями, характерными для экспериментов по поиску темного вещества во Вселенной и для детекторов реакторных антинейтрино, использующих эффект когерентного рассеяния нейтрино на тяжелых ядрах ксенона. Приводятся первые результаты исследования природы одноэлектронных шумов в жидкоксеноновом эмиссионном детекторе и обсуждаются возможные пути их подавления.
Published in: ПРИБОРЫ И ТЕХНИКА ЭКСПЕРИМЕНТА, 2012, № 4, с. 7–13

Title: Modeling of Filters for Formation of Mono-Energetic Neutron Beams in the Research Reactor IRT MEPhI
Authors: S.V. Ivakhin, G.V. Tikhomirov, A.I. Bolozdynya, D. Yu. Akimov, V. N. Stekhanov
Annotations: The paper considers formation of mono-energetic neutron beams at the entrance of experimental channels in research reactors for various applications. The problem includes the following steps:
1. Full-scale mathematical model of the research IRT MEPhI was developed for numerical evaluations of neutron spectra and neutron spatial distribution in the area of experimental channels.
2. Modeling of filters in the channel to shift neutron spectrum towards the required mono-energetic line was performed.
3. Some characteristics of neutron beams at the entrance of experimental channel with the filter were evaluated. The filter materials were selected. The calculations were carried out with application of the computer code based on the high-precision Monte-Carlo code MCNP. As a result, mathematical model was created for the filter which is able to form mono-energetic (24 keV) neutron beam. The study was carried out within the frames of the research project on development of Russian emission detector with liquid noble gas to observe rare processes of neutrino scattering and particles of hypothetical dark matter in atomic nuclei.
Published in: Proceedings of GLOBAL 2011, Makuhari, Japan, Dec. 11-16, 2011, Paper No. 392341

Title: Perspectives to measure neutrino-nuclear neutral current coherent scattering with two-phase emission detector
Authors: RED Collaboration: D. Yu. Akimov, I. S. Alexandrov, V. I. Aleshin, V. A. Belov, A. I. Bolozdynya, A. A. Burenkov, A. S. Chepurnov, M. V. Danilov, A. V. Derbin, V. V. Dmitrenko, A. G. Dolgolenko, D. A. Egorov, Yu. V. Efremenko, A. V. Etenko, M. B. Gromov, M. A. Gulin, S. V. Ivakhin, V. A. Kantserov, V. A. Kaplin, A. K. Karelin, A. V. Khromov, M. A. Kirsanov, S. G. Klimanov, A. S. Kobyakin, A. M. Konovalov, A. G. Kovalenko, V. I. Kopeikin, T. D. Krakhmalova, A. V. Kuchenkov, A. V. Kumpan, E. A. Litvinovich, G. A Lukyanchenko, I. N. Machulin, V. P. Martemyanov, N. N. Nurakhov, D. G. Rudik, I. S. Saldikov, M. D. Skorokhatov, et al.
Date: 09.12.2012
Annotations: We propose to detect and to study neutrino neutral current coherent scattering off atomic nuclei with a two-phase emission detector using liquid xenon as a working medium. Expected signals and backgrounds are calculated for two possible experimental sites: Kalinin Nuclear Power Plant in the Russian Federation and Spallation Neutron Source at the Oak Ridge National Laboratory in the USA. Both sites have advantages as well as limitations. However the experiment looks feasible at either location. Preliminary design of the detector and supporting R&D program are discussed.
Published in: arXiv:1212.1938

Title: Opportunities for Neutrino Physics at the Spallation Neutron Source: A White Paper
Authors: A. Bolozdynya, F. Cavanna, Y. Efremenko, G. T. Garvey, V. Gudkov, A. Hatzikoutelis, W. R. Hix, W. C. Louis, J. M. Link, D. M. Markoff, G. B. Mills, K. Patton, H. Ray, K. Scholberg, R. G. Van de Water, C. Virtue, D. H. White, S. Yen, J. Yoo
Date: 22.11.2012
Annotations: The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, Tennessee, provides an intense flux of neutrinos in the few tens-of-MeV range, with a sharply-pulsed timing structure that is beneficial for background rejection. In this document, the product of a workshop at the SNS in May 2012, we describe this free, high-quality stopped-pion neutrino source and outline various physics that could be done using it. We describe without prioritization some specific experimental configurations that could address these physics topics.
Published in: White paper associated with the Workshop on Neutrinos at the Spallation Neutron Source, May 2012

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