MULTICONFIGURATION FISSION CROSS-SECTIONS AT TRANSITIONAL ENERGY REGION 20-200 MeV

Yavshits S.¹, Boykov G.¹, Ippolitov V.¹, Pakhomov S.¹, Roschin A.¹, Grudzevich O.^2
1V.G.Khlopin Radium Institute, St.-Petersburg, Russia
²Institute of Nuclear Power, Obninsk, Russia

Abstract

The new approach to the calculation of nucleon induced fission cross sections at 20-200 MeV is presented. The cross sections of multiconfiguration fission (MCF) is calculated as a mixture of (Z,A,p,h,U) configurations formed as a result of fast stage of fission reaction with weights defined by population probability Y of (Z,A) nucleus in (p,h) particle-hole state at excitation energy U. We use intranuclear cascade model to compute the probability Y and precompound-statistical model for calculation of fission and de-excitation cross section from state (Z,A,p,h,U). Calculated results are presented for two absorption cross sections obtained with two optical model parameters sets. Up to 15 fissioning nuclei in 10 (p,h) states at wide excitation region were taken into account in calculation.

Keywords
nucleon induced fission cross sections, the cross sections of multiconfiguration fission, intranuclear cascade model, precompound-statistical model, optical model parameters

Article Text (in English, PDF, Translated by IAEA)

References

UDC 539.173

Problems of Atomic Science and Technology. Series: Nuclear Constants, issue 1, 2000