Levels of186Re populated in thermal neutron capture reaction

J Bērzinš,L Simonova,W Urban,M Jentschel,T Krasta

doi:10.1051/epjconf/20159301045

Abstract

Levels of 186Re have been studied in the thermal neutron capture reaction with an enriched 185Re target. Evaluation of spectrum measured with GAMS5 allowed to obtain energies and intensities of more than 500 γ-lines assigned to 186Re. Most of the obtained transitions have been placed in the model-independent level scheme of the doubly odd 186Re nucleus, taking into account the available data of earlier experiments as well as the results of recent 187Re(p, d)186Re reaction measurements. Structure of the 186Re low-lying levels has been analysed in terms of the particle-plus-rotor coupling model.

Highlights

The doubly-odd 186Re nucleus is a close neighbour to the 188Re which has been an object of our previous studies [1]
Previous thermal neutron capture studies of the 186Re levels have been carried out more than 40 years ago [2, 3] resulting in the development of model-interpreted level scheme up to about 1 MeV
We present the preliminary results of new thermal neutron capture study of 186Re levels performed at ILL

Summary

Introduction

The doubly-odd 186Re nucleus is a close neighbour to the 188Re which has been an object of our previous studies [1]. Previous thermal neutron capture studies of the 186Re levels have been carried out more than 40 years ago [2, 3] resulting in the development of model-interpreted level scheme up to about 1 MeV. Important data about depopulation of high spin levels have been obtained in the decay study [4] of the long-lived (2 × 105 years) isomer of 186Re. a number of unsolved structure problems remained, especially for positive parity levels. We present the preliminary results of new thermal neutron capture study of 186Re levels performed at ILL. The obtained experimental data, in combination with the (p, d) reaction results [5], provide ample material for further development of the 186Re level scheme

Experimental methods and results

Discussion and conclusions