Analysis of neutron multiplicity and fission fragment mass distribution within the asymmetric two-center shell model

作者：Singh Pardeep^*; Kaur Harjeet; Malik Sham S

来源：European Physical Journal A, 2014, 50(4): 68.

DOI：10.1140/epja/i2014-14068-y

The fission fragment mass distribution followed by neutron emission is studied for the U-238(O-18,f) reaction using the asymmetric two-center shell model. Within the thermodynamic approach, excitation energy carried by the compound nucleus is dissipated in the emission of a pair of neutrons in several consecutive steps. Therefore, we have considered 2-12 (in step of 2) neutron emission channels in our formalism. The mass distribution corresponding to 8-neutron emission channel compares reasonably well with the experimental data. The observed fine structure dips corresponding to shell closure (Z = 50 and N = 82 of individual fission fragment arise mainly due to shell structure in the mass parameters. However, an exact location and magnitude of the dip at A = 124 in the mass distribution depends on how the temperature modifies masses and, also, on the precise information of pre- and post-neutron emission data. This suggests a possible importance of extending these calculations to get new insight into an understanding of the dynamical behaviour of fragment formation in the fission process.

• 出版日期2014-4-8