, 92:35 | Cite as

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

  • Swati GargEmail author
  • Ashok Kumar Jain


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.


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


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


  1. 1.
    A K Jain, D Choudhary and B Maheshwari, Nucl. Data Sheets 120, 123 (2014) and references thereinGoogle Scholar
  2. 2.
    S Garg and A K Jain, Phys. Scr. 92, 094001 (2017)ADSCrossRefGoogle Scholar
  3. 3.
    A K Jain and S Garg, Invited talk at 16th International Symposium on Capture Gamma Ray Spectroscopy and Related Topics (CGS16) (Shanghai Jiao Tong University, China, 18–22 September 2017), Eur. Phys. J. Web of Conferences 178, 05007 (2018)Google Scholar
  4. 4.
    S Garg, B Maheshwari and A K Jain, Phys. Scr. 93, 124008 (2018)ADSCrossRefGoogle Scholar
  5. 5.
    I Kelson, Proceedings of the Conference on Nuclear Isospin edited by D Anderson, S D Bloom, J Cerny and W W True (Academic Press, London, 1969) p. 781Google Scholar
  6. 6.
    W Heisenberg, Z. Phys. 77, 1 (1932)ADSCrossRefGoogle Scholar
  7. 7.
    D Robson, Ann. Rev. Nucl. Sci. 16, 119 (1966)ADSCrossRefGoogle Scholar
  8. 8.
    D Warner, M A Bentley and P Van Isacker, Nat. Phys. 2, 311 (2006)CrossRefGoogle Scholar
  9. 9.
    J M Soper, Isospin in nuclear physics edited by D H Wilkinson (North-Holland Publishing Company, Amsterdam, 1969) pp. 229–258Google Scholar
  10. 10.
    J D Anderson and C Wong, Phys. Rev. Lett. 7, 250 (1961)ADSCrossRefGoogle Scholar
  11. 11.
    A M Lane and J M Soper, Nucl. Phys. 37, 663 (1962)CrossRefGoogle Scholar
  12. 12.
    L A Sliv and Yu I Kharitononv, Phys. Lett. 16, 176 (1965)ADSCrossRefGoogle Scholar
  13. 13.
    A Bohr and B Mottelson, Nuclear structure (W. A. Benjamin, New York, 1969) Vol. 1, pp. 171–175Google Scholar
  14. 14.
    N Auerbach, Phys. Rep. 98, 273 (1983)ADSCrossRefGoogle Scholar
  15. 15.
    D Rochman et al, Nucl. Phys. A 710, 3 (2002)ADSCrossRefGoogle Scholar
  16. 16.
    B Cassen and E U Condon, Phys. Rev. 50, 846 (1936)ADSCrossRefGoogle Scholar
  17. 17.
    F Gonnenwein, Neutron-induced fission, Lecture given at the Ecole Joliot Curie, Frejus, France (2014),
  18. 18.
    L S Danu et al, Phys. Rev. C 81, 014311 (2010)ADSCrossRefGoogle Scholar
  19. 19.
    L S Danu, D C Biswas, B K Nayak and R K Choudhury, Pramana—J. Phys. 85, 379 (2015)ADSCrossRefGoogle Scholar
  20. 20.
    A Bogachev et al, Eur. Phys. J. A 34, 23 (2007)ADSCrossRefGoogle Scholar
  21. 21.
    P Banerjee et al, Phys. Rev. C 92, 024318 (2015)ADSCrossRefGoogle Scholar

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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