Open Access
ND 2007
Article Number 094
Number of page(s) 4
Section Fission studies
Published online 17 June 2008
International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07194

Systematic on fission fragment mass distribution of 235U fission

Liu Tingjin, Sun Zhengjun, Shu Nengchuan and Liu Ping

China Nuclear Data Center, China Institute of Atomic Energy, Beijing, P.R. China

Published online: 21 May 2008

Based on the fission fragment mass distribution data up to 20 MeV measured by Hambsch with double kinetic energy method (KEM) and other chain yield data measured with radio active method (RAM), the systematic of fission fragment mass distribution was investigated by using 5 Gaussian model. A code of nonlinear least squares method was developed and the parameters, called discrete parameters, were deduced by fitting the experimental data at each energy point measured. The discrete parameters as functions of energy were fitted with second order functions by least squares method, so that the parameters, called systematic parameters, can be calculated at any energy point. With the systematic, the yields of any mass A at any energy in the region from 0 to 20 MeV can be calculated. The calculated results could reproduce the experimental data measured with KEM well, but show somewhat systematical difference from the data measured by RAM, which reflects there is some systematical difference between the two kinds of measured data. The possible reason is that the data measured by KEM need more complicated accurate corrections.

© CEA 2008