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Title: Conservation of Isospin in Neutron-rich Fission Fragments

On the occasion of the 75{sup th} anniversary of the fission phenomenon, we present a surprisingly simple result which highlights the important role of isospin and its conservation in neutron rich fission fragments. We have analysed the fission fragment mass distribution from two recent heavyion reactions {sup 238}U({sup 18}O,f) and {sup 208}Pb({sup 18}O,f) as well as a thermal neutron fission reaction {sup 245}Cm(n{sup th},f). We find that the conservation of the total isospin explains the overall trend in the observed relative yields of fragment masses in each fission pair partition. The isospin values involved are very large making the effect dramatic. The findings open the way for more precise calculations of fission fragment distributions in heavy nuclei and may have far reaching consequences for the drip line nuclei, HI fusion reactions, and calculation of decay heat in the fission phenomenon.
Authors:
 [1] ;  [1] ;  [2] ;  [1]
  1. Department of Physics, Indian Institute of Technology, Roorkee-247667 (India)
  2. (India)
Publication Date:
OSTI Identifier:
22436701
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Data Sheets; Journal Volume: 120; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; AFTER-HEAT; CURIUM 245; FISSION FRAGMENTS; HEAVY ION FUSION REACTIONS; ISOSPIN; LEAD 208; MASS DISTRIBUTION; OXYGEN 18; THERMAL NEUTRONS; THERMONUCLEAR REACTIONS; URANIUM 238