skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Beta Decay in the Field of an Electromagnetic Wave and Experiments on Measuring the Neutrino Mass

Abstract

Investigations of the effect of an electromagnetic wave field on the beta-decay process are used to analyze the tritium-decay experimental data on the neutrino mass. It is shown that the electromagnetic wave can distort the beta spectrum, shifting the end point to the higher energy region. This phenomenon is purely classical and it is associated with the electron acceleration in the radiation field. Since strong magnetic fields exist in setups for precise measurement of the neutrino mass, the indicated field can appear owing to the synchrotron radiation mechanism. The phenomenon under consideration can explain the experimentally observed anomalies in the spectrum of the decay electrons; in particular, the effect of the 'negative square of the neutrino mass'.

Authors:
;  [1]
  1. Moscow State University, Vorob'evy gory, Moscow, 119992 (Russian Federation)
Publication Date:
OSTI Identifier:
20692808
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 68; Journal Issue: 6; Other Information: Translated from Yadernaya Fizika, ISSN 0044-0027, 68, 1074-1077 (No. 6, 2005); DOI: 10.1134/1.1954830; (c) 2005 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); TN:
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACCELERATION; BETA DECAY; BETA SPECTRA; ELECTRONS; MAGNETIC FIELDS; NEUTRINOS; REST MASS; SYNCHROTRON RADIATION; TRITIUM

Citation Formats

Dorofeev, O.F., and Lobanov, A.E. Beta Decay in the Field of an Electromagnetic Wave and Experiments on Measuring the Neutrino Mass. United States: N. p., 2005. Web. doi:10.1134/1.1954830.
Dorofeev, O.F., & Lobanov, A.E. Beta Decay in the Field of an Electromagnetic Wave and Experiments on Measuring the Neutrino Mass. United States. doi:10.1134/1.1954830.
Dorofeev, O.F., and Lobanov, A.E. 2005. "Beta Decay in the Field of an Electromagnetic Wave and Experiments on Measuring the Neutrino Mass". United States. doi:10.1134/1.1954830.
@article{osti_20692808,
title = {Beta Decay in the Field of an Electromagnetic Wave and Experiments on Measuring the Neutrino Mass},
author = {Dorofeev, O.F. and Lobanov, A.E.},
abstractNote = {Investigations of the effect of an electromagnetic wave field on the beta-decay process are used to analyze the tritium-decay experimental data on the neutrino mass. It is shown that the electromagnetic wave can distort the beta spectrum, shifting the end point to the higher energy region. This phenomenon is purely classical and it is associated with the electron acceleration in the radiation field. Since strong magnetic fields exist in setups for precise measurement of the neutrino mass, the indicated field can appear owing to the synchrotron radiation mechanism. The phenomenon under consideration can explain the experimentally observed anomalies in the spectrum of the decay electrons; in particular, the effect of the 'negative square of the neutrino mass'.},
doi = {10.1134/1.1954830},
journal = {Physics of Atomic Nuclei},
number = 6,
volume = 68,
place = {United States},
year = 2005,
month = 6
}
  • Some improvements in the final state spectrum of T{sub 2} {beta} decay are discussed. Their importance for neutrino mass determination has been estimated through numerical experiments. Results depend most strongly on the length of the energy interval of the experimental spectrum used in the fit to the theoretical spectrum. For a Gaussian resolution function and fit intervals to 1.1 keV below the end point energy physically plausible changes in the final state distribution could contribute as much as {minus}30 eV{sup 2} to the systematic error in {ital m}{sub {nu}}{sup 2}. A wider resolution function can increase this error by amore » factor of 2 or 3. An improved final state spectrum for neutrino mass determination is presented. {copyright} {ital 1996 The American Physical Society.}« less
  • It is shown that the total decay probability depends substantially on the external field only via the quantum parameters chi = E/H/sub c/ and lambda = h..omega../mc/sup 2/, where E and ..omega.. are the amplitude and frequency of the wave and H/sub c/ = m/sup 2/c/sup 3//eh. The field corrections are exceedingly small (< or approx. =10/sup -12/--10/sup -14/) even at the highest presently attainable laser-field intensities. In the case of a low energy release (Epsilon/sub 0/-1<<1) the quantum parameters assume a different form, but for decays of real nuclei these corrections remain small as before. At high wave-quantum energiesmore » (lambda>>1) the decay time can decrease appreciably. Account is taken of the effects due to the polarization of the initial state of the nucleus and to circular polarization of the wave field. In particular, in the region lambda>>1 the estimate sigma/sup +//sigma/sup -/roughly-equal1/6 is valid for the ratio of the total cross sections of the ..beta..-decay processes induced by photons having different helicities.« less
  • The ..beta.. decay of polarized nuclei, induced by an intense electromagnetic wave, is investigated. For allowed transitions the angular distribution and spectrum of the decay electrons is obtained and their polarization is studied. Corrections to the total probability, associated with the variation of the phase space of the final reaction products, are found. The dependence of the characteristics of the process on the polarization of the wave is established. OFF
  • A study is made on a polarized neutron undergoing ..beta..-decay induced by an intense electromagnetic wave. The angular distribution of electrons in the decay is obtained and their polarization is studied. A comparison is made with the decay of a moving neutron.
  • A detailed discussion is given of the effect of a strong monochromatic electromagnetic wave on unique first-forbidden ..beta..-transitions. The possibility that the absorption of field quanta from the wave by the nucleus (or the emission of such quanta into the wave) may result in the relaxation of this forbiddeness is examined. It is shown that the predictions that there should be a substantial increase in the probability made by Reiss (Phys. Rev. C 27, 1199, 1229 (1983)) of forbidden ..beta..-transitions in a strong wave are incorrect.