Partition between the fission fragments of the excitation energy and of the neutron multiplicity at scission in low-energy fission

N. Carjan, F.-J. Hambsch, M. Rizea, and O. Serot
Phys. Rev. C 85, 044601 – Published 2 April 2012

Abstract

The partition between the light (L) and the heavy (H) fission fragments of the excitation energy available at scission is studied in the framework of the sudden approximation, i.e., under the assumption that the neck rupture and the absorption of the neck pieces by the fragments happen infinitely fast. We are dealing with a sudden transition between two different nuclear configurations (αiαf) and we only need to know the two sets of neutron eigenstates involved. The accent in the present work is put on the dependence of this share of energy on the mass asymmetry AL/AH of the primary fission fragments during the low-energy fission of 236U. In particular, for every fragment mass A we estimate the scission neutron multiplicity νsc, the average energy cost for their release Eνsc, the primary fragments' excitation energy Esc*, and the corresponding temperature Tsc. The results are analyzed separately for each value of Ω (the projection of the angular momentum on the symmetry axis). As general trends, a decrease of Esc* (Tsc) and an increase of νsc (Eνsc) with increasing A were observed.

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  • Received 19 August 2011

DOI:https://doi.org/10.1103/PhysRevC.85.044601

©2012 American Physical Society

Authors & Affiliations

N. Carjan1,2, F.-J. Hambsch1, M. Rizea2, and O. Serot3

  • 1EC-JRC, Institute for Reference Materials and Measurements, B-2440 Geel, Belgium
  • 2Horia Hulubei-National Institute for Physics and Nuclear Engineering, P.O. Box MG-6, RO-077125 Magurele, Romania
  • 3CEA Cadarache, F-13108 Saint Paul lez Durance, France

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Issue

Vol. 85, Iss. 4 — April 2012

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