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Title: The Rate of Decay of Fission Products

Abstract

By considering the fission products as a sort of statistical assembly, calculations have been made of the β -disintegrations per second and of the total energy emitted per second at any time after fission has taken place (cf. Fig. 6). The results are in good agreement with experiment. The theoretical work is based on the assumption that the mass of a nucleus of mass number A and charge Z is given by a ( Z 0 ( A ) - Z ) 2 + b . Empirical values for a and b are used. Use is also made of an approximate empirical relationship between half-life and disintegration energy. A further basic hypothesis which is important for the results at very short times after fission has taken place is that, in the most probable way of splitting, the chain lengths of the light and heavy fragments are equal and that there is not much deviation from this most probable mode of fission. (See L. E. Glendenin, C. D. Coryell, R. R. Edwards, and M. H. Feldman, CL-LEG-1. A tentative explanation has been given recently by R. D. Present, Phys. Rev. 72, 7 (1947).) The average number of β -disintegrations per fissionmore » is found to be 6; the average energy of all radiations ( β, γ, and neutrino) of the fission products is 21.5 ± 3 Mev. Apparently, about half of this energy escapes in the form of neutrinos and a quarter is emitted in the form of β and in the form of γ rays.« less

Authors:
 [1];  [1]
  1. Clinton National Lab., Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Clinton National Lab., Oak Ridge, TN (United States)
Sponsoring Org.:
US Atomic Energy Commission (AEC)
OSTI Identifier:
12704816
Report Number(s):
MonP-303
Journal ID: ISSN 1536-6065
Grant/Contract Number:  
W-35-058-ENG-71
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review
Additional Journal Information:
Journal Volume: 73; Journal Issue: 11; Journal ID: ISSN 1536-6065
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

May, K., and Wigner, Eugene P. The Rate of Decay of Fission Products. United States: N. p., 1948. Web.
May, K., & Wigner, Eugene P. The Rate of Decay of Fission Products. United States.
May, K., and Wigner, Eugene P. Tue . "The Rate of Decay of Fission Products". United States. https://www.osti.gov/servlets/purl/12704816.
@article{osti_12704816,
title = {The Rate of Decay of Fission Products},
author = {May, K. and Wigner, Eugene P.},
abstractNote = {By considering the fission products as a sort of statistical assembly, calculations have been made of the β -disintegrations per second and of the total energy emitted per second at any time after fission has taken place (cf. Fig. 6). The results are in good agreement with experiment. The theoretical work is based on the assumption that the mass of a nucleus of mass number A and charge Z is given by a ( Z0 ( A ) - Z )2 + b . Empirical values for a and b are used. Use is also made of an approximate empirical relationship between half-life and disintegration energy. A further basic hypothesis which is important for the results at very short times after fission has taken place is that, in the most probable way of splitting, the chain lengths of the light and heavy fragments are equal and that there is not much deviation from this most probable mode of fission. (See L. E. Glendenin, C. D. Coryell, R. R. Edwards, and M. H. Feldman, CL-LEG-1. A tentative explanation has been given recently by R. D. Present, Phys. Rev. 72, 7 (1947).) The average number of β -disintegrations per fission is found to be 6; the average energy of all radiations ( β, γ, and neutrino) of the fission products is 21.5 ± 3 Mev. Apparently, about half of this energy escapes in the form of neutrinos and a quarter is emitted in the form of β and in the form of γ rays.},
doi = {},
journal = {Physical Review},
number = 11,
volume = 73,
place = {United States},
year = {1948},
month = {6}
}

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