Персона: Скорохватов, Михаил Дмитриевич
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Руководитель научной группы "Физика нейтрино и астрочастиц"
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Скорохватов
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Михаил Дмитриевич
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71 results
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- ПубликацияТолько метаданныеStudy of cosmogenic activation above ground for the DarkSide-20k experiment(2023) Elersich, A.; Agnes, P.; Ahmad, I.; Albergo, S.; Grobov, A.; Machulin, I. N.; Skorokhvatov, M. D.; Мачулин, Игорь Николаевич; Скорохватов, Михаил ДмитриевичThe activation of materials due to exposure to cosmic rays may become an important background source for experiments investigating rare event phenomena. DarkSide-20k, currently under construction at the Laboratori Nazionali del Gran Sasso, is a direct detection experiment for galactic dark matter particles, using a two-phase liquid-argon Time Projection Chamber (TPC) filled with 49.7 tonnes (active mass) of Underground Argon (UAr) depleted in 39Ar. Despite the outstanding capability of discriminating gamma/beta background in argon TPCs, this background must be considered because of induced dead time or accidental coincidences mimicking dark-matter signals and it is relevant for low-threshold electron-counting measurements. Here, the cosmogenic activity of relevant long-lived radioisotopes induced in the experiment has been estimated to set requirements and procedures during preparation of the experiment and to check that it is not dominant over primordial radioactivity; particular attention has been paid to the activation of the 120 t of UAr used in DarkSide-20k. Expected exposures above ground and production rates, either measured or calculated, have been considered in detail. From the simulated counting rates in the detector due to cosmogenic isotopes, it is concluded that activation in copper and stainless steel is not problematic. The activity of 39Ar induced during extraction, purification and transport on surface is evaluated to be 2.8% of the activity measured in UAr by DarkSide-50 experiment, which used the same underground source, and thus considered acceptable. Other isotopes in the UAr such as 37Ar and 3H are shown not to be relevant due to short half-life and assumed purification methods.
- ПубликацияТолько метаданныеSiPM-matrix readout of two-phase argon detectors using electroluminescence in the visible and near infrared range(2021) Aalseth, C. E.; Abdelhakim, S.; Agnes, P.; Ajaj, R.; Grobov, A.; Ilyasov, A.; Levashko, N.; Machulin, I. N.; Skorokhvatov, M. D.; Ильясов, Айдар Иршатович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич© 2021, The Author(s).Proportional electroluminescence (EL) in noble gases is used in two-phase detectors for dark matter searches to record (in the gas phase) the ionization signal induced by particle scattering in the liquid phase. The “standard” EL mechanism is considered to be due to noble gas excimer emission in the vacuum ultraviolet (VUV). In addition, there are two alternative mechanisms, producing light in the visible and near infrared (NIR) ranges. The first is due to bremsstrahlung of electrons scattered on neutral atoms (“neutral bremsstrahlung”, NBrS). The second, responsible for electron avalanche scintillation in the NIR at higher electric fields, is due to transitions between excited atomic states. In this work, we have for the first time demonstrated two alternative techniques of the optical readout of two-phase argon detectors, in the visible and NIR range, using a silicon photomultiplier matrix and electroluminescence due to either neutral bremsstrahlung or avalanche scintillation. The amplitude yield and position resolution were measured for these readout techniques, which allowed to assess the detection threshold for electron and nuclear recoils in two-phase argon detectors for dark matter searches. To the best of our knowledge, this is the first practical application of the NBrS effect in detection science.
- ПубликацияТолько метаданныеAntineutrino Signal in the iDREAM Detector at Kalinin NPP(2023) Abramov, A.; Alyev, R.; Chepurnov, A.; Etenko, A.; Litvinovich, E.; Machulin, I.; Oralbaev, A.; Popov, D.; Rastimeshin, A.; Skorokhvatov, M.; Этенко, Александр Владимирович; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Оралбаев, Алдияр Юрьевич; Попов, Даниэль Валерьевич; Растимешин, Антон Алексеевич; Скорохватов, Михаил Дмитриевич
- ПубликацияТолько метаданныеIDREAM Detector at the Kalinin Nuclear Power Plant: Status and Prospects(2023) Abramov, A. V.; Chepurnov, A. S.; Etenko, A. V.; Litvinovich, E. A.; Machulin, I. N.; Oralbaev, A. Yu.; Rastimeshin, A. A.; Skorokhvatov, M. D.; Этенко, Александр Владимирович; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Оралбаев, Алдияр Юрьевич; Растимешин, Антон Алексеевич; Скорохватов, Михаил Дмитриевич
- ПубликацияТолько метаданныеThe study of neutrinos and antineutrinos from astrophysical sources by Borexino(2024) Zavatarelli, S.; Basilico, D.; Bellini, G.; Benziger, J.; Litvinovich, E.; Machulin, I.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич
- ПубликацияТолько метаданныеSimultaneous precision spectroscopy of pp, Be 7, and pep solar neutrinos with Borexino Phase-II(2019) Agostini, M.; Altenmuller, K.; Appel, S.; Atroshchenko, V.; Litvinovich, E.; Machulin, I.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич© 2019 authors. Published by the American Physical Society.We present the simultaneous measurement of the interaction rates Rpp, RBe, Rpep of pp, Be7, and pep solar neutrinos performed with a global fit to the Borexino data in an extended energy range (0.19-2.93) MeV with particular attention to details of the analysis methods. This result was obtained by analyzing 1291.51 days of Borexino Phase-II data, collected after an extensive scintillator purification campaign. Using counts per day (cpd)/100 ton as unit, we find Rpp=134±10(stat)-10+6(sys), RBe=48.3±1.1(stat)-0.7+0.4(sys); and RpepHZ=2.43±0.36(stat)-0.22+0.15(sys) assuming the interaction rate RCNO of CNO-cycle (Carbon, Nitrogen, Oxigen) solar neutrinos according to the prediction of the high metallicity standard solar model, and RpepLZ=2.65±0.36(stat)-0.24+0.15(sys) according to that of the low metallicity model. An upper limit RCNO<8.1 cpd/100 ton (95% C.L.) is obtained by setting in the fit a constraint on the ratio Rpp/Rpep (47.7±0.8 cpd/100 ton or 47.5±0.8 cpd/100 ton according to the high or low metallicity hypothesis).
- ПубликацияОткрытый доступSearch for low mass dark matter in DarkSide-50: the bayesian network approach(2023) Agnes, P.; Albuquerque, I. F. M.; Alexander, T.; Alton, A. K.; Grobov, A.; Machulin, I.; Nozdrina, A. O.; Skorokhvatov, M. D.; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич
- ПубликацияТолько метаданныеSolar and geoneutrinos(2022) Ludhova, L.; Agostini, M.; Altenmuller, K.; Appel, S.; Litvinovich, E.; Machulin, I.; Nugmanov, R.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич© 2022 Institute of Physics Publishing. All rights reserved.Thanks to the progress of neutrino physics, today we are able of exploiting neutrinos as a tool to study astrophysical objects. The latter in turn serve as unique sources of elusive neutrinos, which fundamental properties are still to be understood. This contribution attempts to summarize the latest results obtained by measuring neutrinos emitted from the Sun and geoneutrinos produced in radioactive decays inside the Earth, with a particular focus on a recent discovery of the CNO-cycle solar neutrinos by Borexino. Comprehensive measurement of the pp-chain solar neutrinos and the first directional detection of sub-MeV solar neutrinos by Borexino, the updated 8B solar neutrino results of Super-Kamiokande, as well as the latest Borexino and KamLAND geoneutrino measurements are also discussed.
- ПубликацияОткрытый доступBenchmarking the design of the cryogenics system for the underground argon in DarkSide-20k(2025) Acerbi, F.; Rudik, D.; Skorokhvatov, M. D.; Machulin, I. N.; Рудик, Дмитрий Геннадьевич; Скорохватов, Михаил Дмитриевич; Мачулин, Игорь Николаевич
- ПубликацияОткрытый доступModulations of the cosmic muon signal in ten years of Borexino data(2019) Agostini, M.; Altenmueller, K.; Appel, S.; Atroshchenko, V.; Litvinovich, E.; Machulin, I.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил ДмитриевичWe have measured the flux of cosmic muons in the Laboratori Nazionali del Gran Sasso at 3800 m.w.e. to be (3.432 +/- 0.003) center dot 10(-4) m(-2) s(-1) based on ten years of Borexino data acquired between May 2007 and May 2017. A seasonal modulation with a period of (366.3 +/- 0.6) d and a relative amplitude of (1.36 +/- 0.04)% is observed. The phase is measured to be (181.7 +/- 0.4) d, corresponding to a maximum at the 1 st of July. Using data inferred from global atmospheric models, we show the muon flux to be positively correlated with the atmospheric temperature and measure the e ff ective temperature coe ffi cient alpha(T) = 0.90 +/- 0.02. The origin of cosmic muons from pion and kaon decays in the atmosphere allows to interpret the e ff ective temperature coe ffi cient as an indirect measurement of the atmospheric kaon-topion production ratio r(K/pi) = 0.11(-0.07)(+0.11) for primary energies above 18TeV. We find evidence for a long-term modulation of the muon flux with a period of similar to 3000 d and a maximum in June 2012 that is not present in the atmospheric temperature data. A possible correlation between this modulation and the solar activity is investigated. The cosmogenic neutron production rate is found to show a seasonal modulation in phase with the cosmic muon flux but with an increased amplitude of (2.6 +/- 0.4)%.