Structure of 65,67Co studied through the beta decay of 65,67Fe and a deep-inelastic reaction

TL;DR

This study investigates the nuclear structure of neutron-rich isotopes 65,67Co and 65Fe using beta decay and deep-inelastic reactions, revealing complex level structures and coexistence of different nuclear configurations.

Contribution

It combines beta decay and deep-inelastic reaction data to fully establish the level structures of 65,67Co and 65Fe, providing new insights into their nuclear configurations.

Findings

Complete decay schemes for 65Fe, 65Co, and 67Fe.

Identification of coexisting nuclear configurations.

Detailed level structures of 65,67Co.

Abstract

The neutron-rich isotopes 65,67Fe and 65Co have been produced at the LISOL facility, Louvain-La-Neuve, in the proton-induced fission of 238U. Beams of these isotopes have been extracted with high selectivity by means of resonant laser ionization combined with mass separation. Yrast and near-yrast levels of 65Co have also been populated in the 64Ni+238U reaction at Argonne National Laboratory. The level structure of 65Co could be investigated by combining all the information from both the 65Fe and 65Co beta decay and the deep-inelastic reaction. The 65Fe, 65Co and 67Fe decay schemes and the 65Co yrast structure are fully established. The 65,67Co level structures can be interpreted as resulting from the coexistence of core-coupled states with levels based on a low-energy proton-intruder configuration.