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

TY - JOUR

T1 - Mirror energy differences above the 0f7/2 shell: First γ-ray spectroscopy of the Tz = −2 nucleus 56Zn

AU - Fernández, A.

AU - Jungclaus, A.

AU - Doornenbal, P.

AU - Bentley, M.A.

AU - Lenzi, S.M.

AU - Rudolph, D.

AU - Browne, F.

AU - Cortés, M.L.

AU - Koiwai, T.

AU - Taniuchi, R.

AU - Vaquero, V.

AU - Wimmer, K.

AU - Arici, T.

AU - Imai, N.

AU - Kitamura, N.

AU - Longfellow, B.

AU - Lozeva, R.

AU - Mauss, B.

AU - Napoli, D.R.

AU - Niikura, M.

AU - Pereira-Lopez, X.

AU - Pigliapoco, S.

AU - Poves, A.

AU - Recchia, F.

AU - Ruotsalainen, P.

AU - Sakurai, H.

AU - Uthayakumaar, S.

AU - Wadsworth, R.

AU - Yajzey, R.

N1 - ©2021 The Author(s). Published by Elsevier B.V.

PY - 2021/12/10

Y1 - 2021/12/10

N2 - 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.

AB - 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.

U2 - 10.1016/j.physletb.2021.136784

DO - 10.1016/j.physletb.2021.136784

M3 - Article

SN - 0370-2693

VL - 823

JO - Physics Letters B

JF - Physics Letters B

M1 - 136784

ER -