Персона: Мачулин, Игорь Николаевич
Загружается...
Email Address
Birth Date
Научные группы
Организационные подразделения
Организационная единица
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.
Статус
Фамилия
Мачулин
Имя
Игорь Николаевич
Имя
13 results
Результаты поиска
Теперь показываю 1 - 10 из 13
- 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)%.
- ПубликацияОткрытый доступSensitivity to neutrinos from the solar CNO cycle in Borexino(2020) Agostini, M.; Altenmuller, K.; Appel, S.; Atroshchenko, V.; Litvinovich, E.; Machulin, I.; Nugmanov, R.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич© 2020, The Author(s).Neutrinos emitted in the carbon, nitrogen, oxygen (CNO) fusion cycle in the Sun are a sub-dominant, yet crucial component of solar neutrinos whose flux has not been measured yet. The Borexino experiment at the Laboratori Nazionali del Gran Sasso (Italy) has a unique opportunity to detect them directly thanks to the detector’s radiopurity and the precise understanding of the detector backgrounds. We discuss the sensitivity of Borexino to CNO neutrinos, which is based on the strategies we adopted to constrain the rates of the two most relevant background sources, pep neutrinos from the solar pp-chain and 210Bi beta decays originating in the intrinsic contamination of the liquid scintillator with 210Pb. Assuming the CNO flux predicted by the high-metallicity Standard Solar Model and an exposure of 1000 days × 71.3 t, Borexino has a median sensitivity to CNO neutrino higher than 3 σ. With the same hypothesis the expected experimental uncertainty on the CNO neutrino flux is 23%, provided the uncertainty on the independent estimate of the 210Bi interaction rate is 1.5 cpd/100ton . Finally, we evaluated the expected uncertainty of the C and N abundances and the expected discrimination significance between the high and low metallicity Standard Solar Models (HZ and LZ) with future more precise measurement of the CNO solar neutrino flux.
- ПубликацияОткрытый доступMeasurement of isotopic separation of argon with the prototype of the cryogenic distillation plant Aria for dark matter searches(2023) Aaron, E.; Agnes, P.; Ahmad, I.; Albergo, S.; Grobov, A.; Machulin, I. N.; Skorokhvatov, M. D.; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич
- 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
- ПубликацияОткрытый доступSearch for low-mass dark matter WIMPs with 12 ton-day exposure of DarkSide-50(2023) Agnes, P.; Albuquerque, I. F. M.; Alexander, T.; Alton, A. K.; Grobov, A.; Machulin, I. N.; Nozdrina, A. O.; Skorokhvatov, M. D.; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич
- ПубликацияОткрытый доступSolar neutrinos from the CNO fusion cycle: Borexino discovery and implications for the solar physics(2024) Ludhova, L.; Appel, S.; Bagdasarian, Z.; Litvinovich, E.; Machulin, I.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич
- ПубликацияОткрытый доступCombined directional and spectral analysis of solar neutrinos from Carbon-Nitrogen-Oxygen fusion cycle with Borexino Experiment(2024) Singhal, A.; Basilico, D.; Bellini, G.; Benziger, J.; Litvinovich, E.; Machulin, I.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил ДмитриевичBorexino, placed at LNGS in Italy, was a 280-ton liquid scintillator detector that took data from May 2007 to October 2021. Thanks to its unprecedented radio-purity, the real time spectroscopic measurement of solar neutrinos from both the \textit{pp}-chain and Carbon-Nitrogen-Oxygen (CNO) fusion cycle of the Sun has been performed. Borexino also reported the first directional measurement of sub-MeV $
- ПубликацияОткрытый доступIndependent determination of the Earth's orbital parameters with solar neutrinos in Borexino(2023) Appel, S.; Altenmuller, K.; Altenmuller, K.; Appel, S.; Litvinovich, E.; Machulin, I.; Nugmanov, R.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил ДмитриевичSince the beginning of 2012, the Borexino collaboration has been reporting precision measurements of the solar neutrino fluxes, emitted in the proton–proton chain and in the Carbon–Nitrogen–Oxygen cycle. The experimental sensitivity achieved in Phase-II and Phase-III of the Borexino data taking made it possible to detect the annual modulation of the solar neutrino interaction rate due to the eccentricity of Earth's orbit, with a statistical significance greater than 5σ. This is the first precise measurement of the Earth's orbital parameters based solely on solar neutrinos and an additional signature of the solar origin of the Borexino signal. The complete periodogram of the time series of the Borexino solar neutrino detection rate is also reported, exploring frequencies between one cycle/year and one cycle/day. No other significant modulation frequencies are found. The present results were uniquely made possible by Borexino's decade-long high-precision solar neutrino detection. © 2022 Elsevier B.V.
- ПубликацияОткрытый доступDarkSide-20k sensitivity to light dark matter particles(2024) Acerbi, F.; Adhikari, P.; Agnes, P.; Ahmad, I.; Machulin, I.; Rudik, D.; Skorokhvatov, M. D.; Мачулин, Игорь Николаевич; Рудик, Дмитрий Геннадьевич; Скорохватов, Михаил Дмитриевич