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Title: Special features of the inverse-beta-decay reaction proceeding on a proton in a reactor-antineutrino flux

Abstract

The evolution of the reactor-antineutrino spectrum and the evolution of the spectrum of positrons from the inverse-beta-decay reaction in the course of reactor operation and after reactor shutdown are considered. The present-day status in determining the initial reactor-antineutrino spectrum on the basis of spectra of beta particles from mixtures of products originating from uranium and plutonium fission is described. A local rise of the experimental spectrum of reactor antineutrinos with respect to the expected spectrum is studied.

Authors:
;  [1]
  1. National Research Center Kurchatov Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22613990
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 80; Journal Issue: 2; Other Information: Copyright (c) 2017 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 74 ATOMIC AND MOLECULAR PHYSICS; ANTINEUTRINOS; BETA DECAY; BETA PARTICLES; FISSION; PLUTONIUM; POSITRONS; PROTONS; REACTOR OPERATION; REACTOR SHUTDOWN; SPECTRA; URANIUM; REACTOR LIFE CYCLE

Citation Formats

Kopeikin, V. I., E-mail: kopeikin46@yandex.ru, and Skorokhvatov, M. D., E-mail: skorokhvatov-md@nrcki.ru. Special features of the inverse-beta-decay reaction proceeding on a proton in a reactor-antineutrino flux. United States: N. p., 2017. Web. doi:10.1134/S1063778817020223.
Kopeikin, V. I., E-mail: kopeikin46@yandex.ru, & Skorokhvatov, M. D., E-mail: skorokhvatov-md@nrcki.ru. Special features of the inverse-beta-decay reaction proceeding on a proton in a reactor-antineutrino flux. United States. doi:10.1134/S1063778817020223.
Kopeikin, V. I., E-mail: kopeikin46@yandex.ru, and Skorokhvatov, M. D., E-mail: skorokhvatov-md@nrcki.ru. Wed . "Special features of the inverse-beta-decay reaction proceeding on a proton in a reactor-antineutrino flux". United States. doi:10.1134/S1063778817020223.
@article{osti_22613990,
title = {Special features of the inverse-beta-decay reaction proceeding on a proton in a reactor-antineutrino flux},
author = {Kopeikin, V. I., E-mail: kopeikin46@yandex.ru and Skorokhvatov, M. D., E-mail: skorokhvatov-md@nrcki.ru},
abstractNote = {The evolution of the reactor-antineutrino spectrum and the evolution of the spectrum of positrons from the inverse-beta-decay reaction in the course of reactor operation and after reactor shutdown are considered. The present-day status in determining the initial reactor-antineutrino spectrum on the basis of spectra of beta particles from mixtures of products originating from uranium and plutonium fission is described. A local rise of the experimental spectrum of reactor antineutrinos with respect to the expected spectrum is studied.},
doi = {10.1134/S1063778817020223},
journal = {Physics of Atomic Nuclei},
number = 2,
volume = 80,
place = {United States},
year = {Wed Mar 15 00:00:00 EDT 2017},
month = {Wed Mar 15 00:00:00 EDT 2017}
}
  • The energy spectra of antineutrinos produced in the beta decay of fragments originating from {sup 233}U and {sup 232}Th fission induced by neutrons are calculated. The relevant cross sections and the spectra of positrons produced in inverse beta decay are found. This study was motivated by the hypothesis (discussed over the past decade) that a self-sustained chain reaction proceeds at the center of the Earth ('georeactor'). According to the author of this hypothesis, the georeactor provides energy necessary for maintaining the Earth's magnetic field. It is {sup 235}U and, probably, {sup 232}Th and {sup 233}U that serve as a nuclearmore » fuel in this reactor. Data obtained in the present study can be guidelines in future experiments aimed at testing the hypothesis of the georeactor and at estimating the composition of its nuclear fuel within the development of geophysical and astrophysical investigations based on the observation of antineutrino fluxes in nature.« less
  • The basis for a low-threshold, high-efficiency, direct-counting detector for solar neutrinos from the p-p fusion reaction is proposed. The inverse ..beta.. decay of /sup 115/In to the 614-keV excited state of /sup 115/Sn(T/sub 1///sub 2/=3.26 ..mu..sec) provides a unique delayed-coincidence signature and is estimated to yield a solar-neutrino capture rate of approx.750 solar neutrino units, approx.85 of which is due to pp+pep neutrinos. (AIP)
  • Preliminary results of measurements of the cross section for the reaction nu-tilde/sub e/(p,n)e/sup +/ in the neutrino laboratory at the Rovenskii atomic power plant are reported. Corresponding limits on the parameters of the neutrino oscillations are reported. The reaction was studied by detecting the emitted neutrons with counters filled with helium-3 surrounded by polyethylene.
  • The cross section for the reaction nu-tilde/sub e/+p ..-->.. n+e/sup +/ has been measured in the neutrino laboratory at the Rovenskii nuclear power plant. Limits have been found on the parameters of the neutrino oscillations.
  • As part of the program of study of inverse ..beta.. decay nu-bar/sub e/+p..-->..n+e/sup +/ in the neutrino laboratory at the Rovno Nuclear Power Station, measurements of the cross section for this reaction are being carried out. The technique is based on detection of only neutrons from the reaction without use of coincidences. A higher efficiency has been achieved than in similar experiments in reactors. The result of the cross-section measurement obtained in the first run is sigma/sup(/sup 5/)/sub f/ = 5.79x10/sup -43/ cm/sup 2//fission +- 8% (statistics) +- 7% (systematic error).