Персона: Литвинович, Евгений Александрович
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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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Теперь показываю 1 - 10 из 32
- 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 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 метаданныеSearch for Bosonic Dark Matter Using the iDREAM Neutrino Detector at the Kalinin Nuclear Power Plant(2025) Abramov, A. V.; Zhutikov, I. N.; Kiselev, K. K.; Litvinovich, E. A.; Machulin, I. N.; Oralbaev, A. Yu.; Popov, D. V.; Rastimeshin, A. A.; Chmykhalo, D. A.; Etenko, A. V.; Жутиков, Иван Николаевич; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Оралбаев, Алдияр Юрьевич; Попов, Даниэль Валерьевич; Растимешин, Антон Алексеевич; Чмыхало, Дмитрий Александрович; Этенко, Александр Владимирович
- 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 $
- ПубликацияТолько метаданныеSearch for low-energy neutrinos from astrophysical sources with Borexino(2021) Agostini, M.; Altenmuller, K.; Appel, S.; Atroshchenko, V.; Litvinovich, E.; Machulin, I.; Skorokhvatov, M.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич© 2020We report on searches for neutrinos and antineutrinos from astrophysical sources performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso in Italy. Electron antineutrinos (ν¯e) are detected in an organic liquid scintillator through the inverse β-decay reaction. In the present work we set model-independent upper limits in the energy range 1.8–16.8 MeV on neutrino fluxes from unknown sources that improve our previous results, on average, by a factor 2.5. Using the same data set, we first obtain experimental constraints on the diffuse supernova ν¯e fluxes in the previously unexplored region below 8 MeV. A search for ν¯e in the solar neutrino flux is also presented: the presence of ν¯e would be a manifestation of a non-zero anomalous magnetic moment of the neutrino, making possible its conversion to antineutrinos in the strong magnetic field of the Sun. We obtain a limit for a solar ν¯e flux of 384 cm–2 s–1 (90% C.L.), assuming an undistorted solar 8B neutrinos energy spectrum, that corresponds to a transition probability pνe→ν¯e< 7.2 × 10–5 (90% C.L.) for Eν¯e > 1.8 MeV. At lower energies, by investigating the spectral shape of elastic scattering events, we obtain a new limit on solar 7Be-νe conversion into ν¯e of pνe→ν¯e< 0.14 (90% C.L.) at 0.862 MeV. Last, we investigate solar flares as possible neutrino sources and obtain the strongest up-to-date limits on the fluence of neutrinos of all flavor neutrino below 3–7 MeV. Assuming the neutrino flux to be proportional to the flare's intensity, we exclude an intense solar flare as the cause of the observed excess of events in run 117 of the Cl-Ar Homestake experiment.
- 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.
- ПубликацияТолько метаданныеBorexinos search for low-energy neutrinos associated with gravitational wave events from GWTC-3 database(2023) Basilico, D.; Bellini, G.; Benziger, J.; Biondi, R.; Machulin, I.; Nugmanov, R.; Skorokhvatov, M.; Litvinovich E.; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич; Литвинович, Евгений АлександровичThe search for neutrino events in correlation with gravitational wave (GW) events for three observing runs (O1, O2 and O3) from 09/2015 to 03/2020 has been performed using the Borexino data-set of the same period. We have searched for signals of neutrino-electron scattering and inverse beta-decay (IBD) within a time window of +/- 1000 s centered at the detection moment of a particular GW event. The search was done with three visible energy thresholds of 0.25, 0.8 and 3.0 MeV. Two types of incoming neutrino spectra were considered: the mono-energetic line and the supernova-like spectrum. GW candidates originated by merging binaries of black holes (BHBH), neutron stars (NSNS) and neutron star and black hole (NSBH) were analyzed separately. Additionally, the subset of most intensive BHBH mergers at closer distances and with larger radiative mass than the rest was considered. In total, follow-ups of 74 out of 93 gravitational waves reported in the GWTC-3 catalog were analyzed and no statistically significant excess over the background was observed. As a result, the strongest upper limits on GW-associated neutrino and antineutrino fluences for all flavors (nu(e),nu(mu),nu(tau)) at the level 10(9)-10(15) cm(-2) GW(-1) have been obtained in the 0.5-5 MeV neutrino energy range.
- ПубликацияТолько метаданныеSearch for low-energy signals from fast radio bursts with the Borexino detector(2022) Appel, S.; Bagdasarian, Z.; Basilico, D.; Bellini, G.; Litvinovich, E.; Machulin, I.; Nugmanov, R.; Skorokhvatov, M.; Zhutikov, I.; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич; Жутиков, Иван Николаевич© 2022, The Author(s).The search for neutrino events in correlation with 42 most intense fast radio bursts (FRBs) has been performed using the Borexino dataset from 05/2007 to 06/2021. We have searched for signals with visible energies above 250 keV within a time window of ±1000 s corresponding to detection time of a particular FRB. We also applied an alternative approach based on searching for specific shapes of neutrino-electron scattering spectra in the full exposure data of the Borexino detector. In particular, two incoming neutrino spectra were considered: the monoenergetic line and the spectrum expected from supernovae. The same spectra were considered for electron antineutrinos detected through inverse beta-decay reaction. No statistically significant excess over the background was observed. As a result, the strongest upper limits on FRB-associated neutrino fluences of all flavors have been obtained in the 0.5–50 MeV neutrino energy range.
- ПубликацияТолько метаданныеIDREAM: Industrial Detector of REactor Antineutrinos for Monitoring at Kalinin nuclear power plant(2022) Abramov, A.; Chepurnov, A.; Etenko, A.; Litvinovich, E.; Machulin, I.; Skorokhvatov, M.; Этенко, Александр Владимирович; Литвинович, Евгений Александрович; Мачулин, Игорь Николаевич; Скорохватов, Михаил Дмитриевич