Mirror energy differences above the 0f7/2 shell: First γ-ray spectroscopy of the Tz = −2 nucleus 56Zn

A. Fernández, A. Jungclaus, P. Doornenbal, M.A. Bentley, S.M. Lenzi, D. Rudolph, F. Browne, M.L. Cortés, T. Koiwai, R. Taniuchi, V. Vaquero, K. Wimmer, T. Arici, N. Imai, N. Kitamura, B. Longfellow, R. Lozeva, B. Mauss, D.R. Napoli, M. NiikuraX. Pereira-Lopez, S. Pigliapoco, A. Poves, F. Recchia, P. Ruotsalainen, H. Sakurai, S. Uthayakumaar, R. Wadsworth, R. Yajzey

Research output: Contribution to journalArticlepeer-review


Excited states in 56Zn were populated following one-neutron removal from a 57Zn beam impinging on a Be target at intermediate energies in an experiment conducted at the Radioactive Isotope Beam Factory at RIKEN. Three γ rays were observed and tentatively assigned to the 6+→4+→2+→0+ yrast sequence. This turns 56Zn into the heaviest Tz=−2 nucleus in which excited states are known. The excitation-energy differences between these levels and the isobaric analogue states in the Tz=+2 mirror partner, 56Fe, are compared with large-scale shell-model calculations considering the full pf valence space and various isospin-breaking contributions. This comparison, together with an analysis of the mirror energy differences in the A=58, Tz=±1 pair 58Zn and 58Ni, provides valuable information with respect to the size of the monopole radial and the isovector multipole isospin-breaking terms in the region above doubly-magic 56Ni.
Original languageEnglish
Article number136784
Number of pages5
JournalPhysics Letters B
Early online date19 Nov 2021
Publication statusPublished - 10 Dec 2021

Bibliographical note

©2021 The Author(s). Published by Elsevier B.V.

Cite this