The results of new comprehensive data analyses of geoneutrino measurements in Borexino experiment at underground Gran Sasso national laboratory (LNGS) are presented. The analysis is the result of 3262.74 days of data between December 2007 and April 2019 with improved analysis techniques and optimized data selection, which includes enlarged fiducial volume and sophisticated cosmogenic veto....
Solar neutrino spectrum measurement plays a crucial role for solar metallicity determination. 127I(nu,e)127Xe reaction is sensitive to CNO and boron components of the solar neutrino spectrum due to the relatively high threshold (662 KeV).
For neutrinos with energies upper S_n = 7.246 MeV 127I(nu,e) capture produces 126Xe + n. The concentration ratio of 127Xe and 126Xe could clarify parameters...
Intensive experimental searches for axions and axion-like particles are currently supported by two main reasons: firstly, axions solve the CP problem of strong interactions and, secondly, axions are well-motivated candidates for the role of dark matter particles. If axions exist, the Sun should be a powerful source of such particles. The expected energy spectrum of solar axions, like the...
Recent achievements in experimental neutrino physics allow studying the Sun's deep interior through the high precision spectroscopic measurements of the solar neutrinos. Currently the most sensitive solar neutrino detector Borexino, which takes data in Gran Sasso national laboratories in Italy, is able to separately measure neutrinos produced in various nuclear reactions of the solar...
The results of a low-energy neutrino search with the Borexino detector in coincidence with gamma-ray bursts (GRB), solar flares (SF) and gravitational wave (GW) events are presented. The correlated events with energies greater than 0.25 (1.0) MeV, positioned inside the detector fiducial volume and not identified as alpha-particles or fast cosmogenic decays (neutrino-like events) were searched...
The DANSS detector is a movable neutrino spectrometer currently operating under one of industrial reactors of the Kalinin Nuclear Power Plant. Its plastic scintillator composition with no flammable or otherwise dangerous materials allows placing it close to the reactor core thus benefiting from ample antineutrino flux. Complex multilayers of the active and passive shielding and high...
The neutrino scattering on nuclei in hot and dense matter relevant for core collapse supernovae, neutron star mergers, and proto-neutron stars is considered accounting for magnetization. At finite temperature neutrinos undergo exo- and endo-energetic scattering [1] on nuclei due to the neutral current Gamow-Teller component. The energy transfer cross section in neutrino-nuclon scattering is...
The Impurity Components in the 7Be Solar
Neutrino Flux
Romanov Yu.I.
Kosygin Russian State University, Moscow, Russia
E-mail: romanov.yu.i@mail.ru
In the present work, a development [1], the flavor structure of the 7Be
solar neutrino (SN) flux is investigated.
The electron spectrum of the (v_e ) ̅e-scattering differs from the fairly flat
spectra of all neutrinos. Such difference will...
DEAP-3600 is a low-background liquid argon detector for a direct WIMP (Weakly Interacting Massive Particles) dark matter search. The detector consists of 3279 kg of LAr contained in a spherical acrylic vessel. Liquid argon is an excellent scintillator, transparent to its own scintillation light. Scintillation is detected by photomultiplier tubes, and pulse shape discrimination is used to...
The Neutrino-4 collaboration plans to modernize the existing installation and create a second neutrino laboratory at reactor СМ-3 and a second neutrino detector with increased sensitivity.
To improve the result, in addition to continuing the current experiment, a new study with an improved neutrino detector is also necessary. The project of the new neutrino laboratory at the СМ-3...
The atmospheric neutrino flux represents a continuous source that can be exploited to infer properties about Cosmic Rays and neutrino oscillation physics.The JUNO observatory, a 20 kt liquid scintillator currently under construction in China, will be able to detect the atmospheric flux, given the large fiducial volume and the excellent energy resolution. The light produced in neutrino...
The total systematic uncertainty of the neutrino flux in accelerator-based neutrino experiments is dominated by the Monte Carlo modeling of hadronic interactions. Direct hadron production measurements for T2K and Fermilab neutrino experiments, MINER$\nu$A, NO$\nu$A and DUNE, are being performed at the NA61/SHINE spectrometer at CERN’s Super Proton Synchrotron. Crucial for improving neutrino...
In kilonova, two neutron stars merge or a black hole absorbs neutron star. In this case, extreme physical conditions arise: in a kilonova substance it can be extremely high temperatures (up to $10^{10}$ K) and high densities (up to $10^{10}$ $g \cdot cm^{-3}$). The consequence of such an extreme state of matter may be the intensification of nuclear fusion processes. This also applies to the...
I. N. Borzov1,2, Yu. S. Lutostansky1, G. A. Koroteev3, V. . Tikhonov1, S. V. Tolokonnikov1,3, A. N. Fazliakhmetov1,4 1 National Research Centre “Kurchatov Institute”, Moscow, Russia 2Bogolubov Laboratory of Theoretical Physics, Joint Institute of Nuclear Research, Dubna, Russia 3 Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Russia 4 Institute...
The process of double neutrinoless e-capture is of great interest as a test of the Majorana nature of neutrino. This process is traditionally considered as as a resonance one, since not a single particle is emitted as a result of the nuclear transformation [1]. For this reason, it cannot occur in bare nuclei, even if the energy release Q > 0. In contrast, we performed calculations of the...
$\ \ \ $We investigated the effect of two processes on the natural beta decay of a neutron: photobeta decay and inverse internal bremsstrahlung. The diagram of the latter process is topologically equivalent to that of internal bremsstrahlung in beta decay, but only with absorption of a photon by the beta electron. Both processes make it possible to take into account the effect of the thermal...
