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Fragment dependence of high energy γ-ray emission in the spontaneous fission of 252Cf

  • D.C. Biswas
  • B.K. Nayak
  • M. Cinausero
  • B. Fornal
  • G. Viesti
  • D. Bazzacco
  • M. DePoli
  • D. Fabris
  • E. Fioretto
  • M. Lunardon
  • D.R. Napoli
  • G. Nebbia
  • G. Prete
  • C.A. Ur
  • G. Vedovato
Nuclear structure

Abstract:

The high energy γ-ray emission accompanying the spontaneous fission of 252Cf has been measured in coincidence with individual fission fragments selected by discrete γ-ray transitions. The enhancement of the γ-ray emission probability in the energy range Eγ= 3–8 MeV has been observed for the fission fragments in the region of nearly symmetric mass splitting, confirming results reported in previous investigations. The γ-γ coincidence technique employed in the present work clearly demonstrate that the major contribution to this enhancement is caused by the fission channels where one fragment is near to the N= 82 or Z= 50 shell closures. The high energy γ-ray emission probability does not show any significant dependence on the number of neutrons emitted in the fission process, supporting the hypothesis that high energy γ-rays are mainly emitted from the fragments after the neutron evaporation.

PACS: 25.85.Ca Spontaneous fission – 23.20.Lv Gamma transitions and level energies – 27.60.+j 90 ≤ A ≤ 149 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • D.C. Biswas
    • 1
  • B.K. Nayak
    • 1
  • M. Cinausero
    • 2
  • B. Fornal
    • 3
  • G. Viesti
    • 4
  • D. Bazzacco
    • 4
  • M. DePoli
    • 2
  • D. Fabris
    • 4
  • E. Fioretto
    • 2
  • M. Lunardon
    • 4
  • D.R. Napoli
    • 2
  • G. Nebbia
    • 4
  • G. Prete
    • 2
  • C.A. Ur
    • 4
  • G. Vedovato
    • 2
  1. 1.Bhabha Atomic Research Centre, Mumbai, IndiaIN
  2. 2.I.N.F.N., Laboratori Nazionali di Legnaro, Via Romea, 4, I-35020 Legnaro, ItalyIT
  3. 3.Institute of Nuclear Physics, Krakow, PolandPL
  4. 4.Dipartimento di Fisica and INFN, Sezione di Padova, Padova, ItalyIT

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