Systematics of fission-channel probabilities

U. Brosa, H.-H. Knitter, Tie-shuan Fan, Ji-min Hu, and Shang-lian Bao
Phys. Rev. C 59, 767 – Published 1 February 1999
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Abstract

Fissioning nuclei produce with increasing excitation varying yields of fragments. For compound nuclei ranging from 232Th to 242Pu endowed with excitation energies typically between 0 and 10 MeV, we analyze these variations in terms of a fission-channel model. Most of the variations can be attributed to changing channel probabilities. We present a systematics of channel probabilities with respect to compound nuclei and their excitation energies, and we relate the systematics to potential energy which the nuclei experience when they float to scission. The trend, which is most difficult to explain, is a shift in the energy sensitivity of the standard channels, as one compares light with heavy compound nuclei. According to their behavior, we divide nuclei into standard I increasers and decreasers and attribute the difference to the standard secondary barriers. As a basic concept, bifurcation ratios are introduced, and a novel expression for transmission coefficients is proposed.

  • Received 13 January 1998

DOI:https://doi.org/10.1103/PhysRevC.59.767

©1999 American Physical Society

Authors & Affiliations

U. Brosa

  • Brosa GmbH, Am Brücker Tor 4, D-35287 Amöneburg, Germany
  • Philipps Universität Marburg, Marburg, Germany

H.-H. Knitter

  • Gerststraat 8, B-2490 Balen, Belgium

Tie-shuan Fan, Ji-min Hu, and Shang-lian Bao

  • Institute for Heavy Ion Physics, Department of Technical Physics, Peking University, Beijing 100871, China

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Vol. 59, Iss. 2 — February 1999

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