Production yields of micro-second isomers populated in 252Cf(SF)

Laurent Gaudefroy,Adeline Ebran

doi:10.1051/epjconf/202024201003

Abstract

A twin Frisch grid ionization chamber loaded with an ultra-thin 252 Cf sample is used in order to detect spontaneous fission events. The chamber is surrounded by 8 HPGe detectors allowing to perform γ-spectroscopic measurements. We are interested in the decay of isomeric states populated in fission fragments. In this contribution we report on preliminary results on production yields of isomeric states with half-lives ranging from few nanoup to few micro-seconds.

Highlights

Spontaneous fission sources offer an interesting possibility in order to study a large number of radioactive species that would otherwise require a particle or ion accelerator to be produced and excited
The experimental setup used in the present work consists of a twin Frisch grid ionization chamber loaded with an ultra-thin 252Cf sample surrounded by 8 HPGe detectors
In this contribution we report on preliminary results on production yields of micro-second isomers populated in 252Cf(SF)

Summary

Introduction

Spontaneous fission sources offer an interesting possibility in order to study a large number of radioactive species that would otherwise require a particle or ion accelerator to be produced and excited. One expects a clear link between the spin-distribution in the primary fragments and the population of high-spin discrete states in the fragments produced after neutron-emission. In this works we propose to measure the production yield of micro-second isomers in fission fragments. Comparison of these results with theoretical predictions should allow to constrain model parameters on spindistribution in primary fission fragments. In the first part of this contribution, we present the experimental setup and the achieved selectivity allowing to perform gamma-spectroscopy of identified fission fragments.

Experimental setup and selectivity

Preliminary results

Findings

Conclusion