Photon and proton induced fission on heavy nuclei at intermediate energies

E Andrade-Ii,V Guimarães,A Deppman,N A Demekhina,A R Balabekyan,G S Karapetyan,B.V Carlson

doi:10.1051/epjconf/20136900017

Abstract

We present an analysis of fission induced by intermediate energy protons or photons on actinides. The 660 MeV proton induced reactions are on 241 Am, 238 U, and 237 Np targets and the Bremmstrahlung-photons with end-point energies at 50 MeV and 3500 MeV are on 232 Th and 238 U targets. The study was performed by means of the Monte Carlo simulation code CRISP. A multimodal fission extension was added to the code within an approach which accounts for the contribution of symmetric and asymmetric fission. This procedure allowed the investigation of fission cross sections, fissility, num- ber of evaporated nucleons and fission-fragment charge distributions. The comparison with experimental data show a good agreement between calculations and experiments.

Highlights

For 7 decades high energy proton induced reactions have been studied with great interest due to the possibility of investigating fundamental issues such as the nucleon-nucleon interaction and properties of excited nuclei
We show that the CRISP code can give a reliable description of the fission dynamics for the reactions studied here
The evaporation of fission fragments is considered, and we found that this mechanism is relevant for the description of the final fragment masses

Summary

Introduction

For 7 decades high energy proton induced reactions have been studied with great interest due to the possibility of investigating fundamental issues such as the nucleon-nucleon interaction and properties of excited nuclei. Better understanding of proton induced reactions leads usually to more predictive power and control, factors that provide great benefit to applications that are already natural recipients for this knowledge such as nuclear reactor techonlogies and nuclear medicine. When it comes to fission, comparison between calculations and experiments, especially distributions of mass and charge can provide important insights about fragment formation. It is possible to study the transformation of the fissioning nucleus at large deformations but the very mechanism of photoabsorption itself as well [1,2,3] validating, the accepted models for photon interaction with the nucleus

Methods

Results

Conclusion