New Results on Excited States in the one-particle one-hole nucleus ⁵⁶Co measured with MINIBALL detectors

¹ Instituto de Física Corpuscular IFIC (CSIC-Univ. Valencia), Valencia Spain
² Dipartamento di Fisica e Astronomia, Università degli Studi di Padova - INFN, Padova Italy
³ Physik Department, Technische Universität München (TUM), Valencia Germany
⁴ Department of Nuclear Physics, The Australian National University, Canberra ACT 2601 Australia
⁵ Department of Physics, Surrey University, Surrey United Kingdom
⁶ Research Centre for Nuclear Physics RCNP, Osaka Japan
⁷ Physics Department, Science Faculty, Istanbul University, Istanbul Turkey

^* e-mail: ana.montaner@ific.uv.es
^** e-mail: rubio@ific.uv.es

Published online: 4 December 2019

Abstract

The non-yrast states of the odd-odd nucleus ⁵⁶Co have been investigated by studying the γ-rays induced in the predominantly fusion-evaporation reaction ⁵⁶Fe(p,n γ)⁵⁶Co at an incident energy of 10 MeV. The γ-rays were measured in-beam with four high-resolution MINIBALL-triple germanium (Ge) detectors. The experiment provided excellent data in γ-γ coincidences. The complex level scheme of ⁵⁶Co was constructed mainly based on the analysis of these γ-γ coincidences. The angular distributions of the γ-rays were also analysed and allowed us to assign spin-parity values to most of the excited states in this nucleus. Despite the extensive work previously done studying the ⁵⁶Co nucleus, the analysis presented in this work has resulted in a large improvement in the knowledge of its structure.