Statistical model calculations for evaporation residue and fission cross sections in210Po compound nucleus.

Ruchi Mahajan,B.R Behera,Santanu Pal,C Simenel,K.E Rehm,N Madhavan,P.R.S Gomes,D.J Hinde,A Navin

doi:10.1051/epjconf/20158600025

Abstract

Statistical model calculations for evaporation residue and fission cross-sections are performed for 210 Po nucleus populated by 18 O + 192 Os system in the excitation energy range of 52.43 - 83.51 MeV. Experimental fusion cross-sections are fitted using CCFULL code. Evaporation residue and fission cross-sections are then fitted using Bohr-Wheeler formalism including shell effects in level density and fission barrier by using scaling factor ( K f ) in the range of 1.0 to 0.75. The results of the calculations are in good agreement with the experimental data.

Highlights

Heavy ion induced fusion-fission reactions are important to study the dynamics and decay of hot nuclear matter. These reactions are sensitive to entrance channel mass asymmetry between the target and projectile, the spin and deformation of the target, the mass of the projectile and the bombarding energy with respect to fusion barriers and coupling of various degrees of freedom [1, 2]
The program CCFULL solves the coupledchannels equations to compute the fusion cross-sections and mean angular momenta of compound nucleus, taking into account the couplings to all orders. It works on the ingoing-wave boundary condition inside the Coulomb barrier to account for fusion, along with the isocentrifugal approximation, which works well for heavy ions
Spin distribution of the compound nucleus is an important ingredient of statistical model and this can be obtained either from Frobrich systematics or by fitting the experimental fusion cross-section with some appropriate model

Summary

Introduction

Heavy ion induced fusion-fission reactions are important to study the dynamics and decay of hot nuclear matter. These reactions are sensitive to entrance channel mass asymmetry between the target and projectile, the spin and deformation of the target, the mass of the projectile and the bombarding energy with respect to fusion barriers and coupling of various degrees of freedom [1, 2]. For gaining a better insight into heavy ion reactions, a detailed study of the decay products of the compound nucleus, such as evaporation residues and compound nucleus fission fragments is necessary. In this regard, evaporation residue and fission cross-section measurements are useful probes to understand the fusionfission dynamics

Statistical model analysis

CCFULL

Results and discussions

Conclusion