Персона: Мачулин, Игорь Николаевич
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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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Игорь Николаевич
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64 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 метаданныеCalibration of the liquid argon ionization response to low energy electronic and nuclear recoils with DarkSide-50(2021) Agnes, P.; Albuquerque, I. F. M.; Alexander, T.; Alton, A. K.; Grobov, A. V.; Machulin, I. N.; Nozdrina, A. O.; Skorokhvatov, M. D.; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич© 2021 American Physical Society. DarkSide-50 has demonstrated the high potential of dual-phase liquid argon time projection chambers in exploring interactions of WIMPs in the GeV/c2 mass range. The technique, based on the detection of the ionization signal amplified via electroluminescence in the gas phase, allows us to explore recoil energies down to the sub-keV range. We report here on the DarkSide-50 measurement of the ionization yield of electronic recoils down to ∼180 eVer, exploiting Ar37 and Ar39 decays, and extrapolated to a few ionization electrons with the Thomas-Imel box model. Moreover, we present a model-dependent determination of the ionization response to nuclear recoils down to ∼500 eVnr, the lowest ever achieved in liquid argon, using in situ neutron calibration sources and external datasets from neutron beam experiments.
- 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 метаданныеDirectionality measurement of CNO neutrinos with Borexino detector(2024) Basilico, D.; Bellini, G.; Biondi, R.; Benziger, J.; Litvinovich, E.; Machulin, I.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич
- ПубликацияТолько метаданныеPulse-shape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data(2021) Adhikari, P.; Ajaj, R.; Alpizar-Venegas, M.; Amaudruz, P. -A.; Grobov, A.; Ilyasov, A.; Levashko, N.; Machulin, I.; Ильясов, Айдар Иршатович; Мачулин, Игорь Николаевич© 2021, The Author(s).The DEAP-3600 detector searches for the scintillation signal from dark matter particles scattering on a 3.3 tonne liquid argon target. The largest background comes from 39Ar beta decays and is suppressed using pulse-shape discrimination (PSD). We use two types of PSD estimator: the prompt-fraction, which considers the fraction of the scintillation signal in a narrow and a wide time window around the event peak, and the log-likelihood-ratio, which compares the observed photon arrival times to a signal and a background model. We furthermore use two algorithms to determine the number of photons detected at a given time: (1) simply dividing the charge of each PMT pulse by the mean single-photoelectron charge, and (2) a likelihood analysis that considers the probability to detect a certain number of photons at a given time, based on a model for the scintillation pulse shape and for afterpulsing in the light detectors. The prompt-fraction performs approximately as well as the log-likelihood-ratio PSD algorithm if the photon detection times are not biased by detector effects. We explain this result using a model for the information carried by scintillation photons as a function of the time when they are detected.
- 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 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 метаданныеImproved Measurement of Solar Neutrinos from the Carbon-Nitrogen-Oxygen Cycle by Borexino and Its Implications for the Standard Solar Model(2022) Appel, S.; Litvinovich, E.; Machulin, I.; Nugmanov, R.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич
- ПубликацияТолько метаданныеUltra-low background physics: lessons from Borexino and future steps(2025) Zavatarelli, S.; Basilico, D.; Bellini, G.; Benziger, J.; Litvinovich, E.; Machulin, I.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич
- ПубликацияТолько метаданныеSearch for Dark Matter Particle Interactions with Electron Final States with DarkSide-50(2023) Agnes, P.; Albuquerque, IFM.; Alexander, T.; Alton, A. K.; Grobov, A.; Machulin, I. N.; Nozdrina, A. O.; Skorokhvatov, M. D.; Мачулин, Игорь Николаевич; Скорохватов, Михаил ДмитриевичWe present a search for dark matter particles with sub-GeV/c2 masses whose interactions have final state electrons using the DarkSide-50 experiment's (12 306 1 184) kg d low-radioactivity liquid argon exposure. By analyzing the ionization signals, we exclude new parameter space for the dark matter-electron cross section sigma over bar e, the axioelectric coupling constant gAe, and the dark photon kinetic mixing parameter kappa. We also set the first dark matter direct-detection constraints on the mixing angle IUe412 for keV/c2 sterile neutrinos.