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Pramana

, 92:35 | Cite as

Test of isospin conservation in thermal neutron-induced fission of \(^{245}\mathrm{Cm}\)

  • Swati GargEmail author
  • Ashok Kumar Jain
Article
  • 9 Downloads

Abstract

We have recently shown that the general trends of partition-wise fission fragment mass distribution in heavy-ion-induced compound nuclear (CN) fission of heavy nuclei can be reproduced reasonably well by using the concept of isospin conservation, hence providing a direct evidence of isospin conservation in neutron-rich systems [Jain et al, Nucl Data Sheets 120, 123 (2014); Garg and Jain, Phys. Scr. 92, 094001 (2017); Jain and Garg, EPJ Web of Conference 178, 05007 (2018); Garg et al, Phys. Scr. 93, 124008 (2018)]. In this paper, we test the concept of isospin conservation to reproduce the fission fragment mass distribution emerging from thermal neutron-induced CN fission reaction, \(^{245}\mathrm{Cm}(n_{\mathrm{th}}, \hbox {f})\). As earlier, we use Kelson’s conjectures [I Kelson, Proceedings of the Conference on Nuclear Isospin (Academic Press, New York, 1969)] to assign isospin to neutron-rich fragments emitted in fission, which suggest the formation of fission fragments in isobaric analogue states. We calculate the relative yields of neutron-rich fragments using the concept of isospin conservation and basic isospin algebra. The calculated results reproduce the experimentally known partition-wise mass distributions quite well. This highlights the usefulness of isospin as an approximately good quantum number in neutron-rich nuclei. This also allows us to predict the fragment distribution of the most symmetric Cd–Cd partition and the heavier mass fragment distributions, both not measured so far.

Keywords

Isospin conservation isobaric analogue states neutron-rich nuclei thermal neutron fission fission fragment distribution 

PACS

21.10.Hw 21.10.Sf 25.85.Ec 25.70.Gh 

Notes

Acknowledgements

The support from the Ministry of Human Resource Development (Government of India) to Swati Garg in the form of a fellowship was gratefully acknowledged.

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Department of PhysicsIndian Institute of Technology RoorkeeRoorkeeIndia
  2. 2.Amity Institute of Nuclear Science & TechnologyAmity UniversityNoidaIndia

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