학술논문
Isospin symmetry in the T = 1,A = 62 triplet
Document Type
article
Author
K. Wimmer; P. Ruotsalainen; S.M. Lenzi; A. Poves; T. Hüyük; F. Browne; P. Doornenbal; T. Koiwai; T. Arici; K. Auranen; M.A. Bentley; M.L. Cortés; C. Delafosse; T. Eronen; Z. Ge; T. Grahn; P.T. Greenlees; A. Illana; N. Imai; H. Joukainen; R. Julin; A. Jungclaus; H. Jutila; A. Kankainen; N. Kitamura; B. Longfellow; J. Louko; R. Lozeva; M. Luoma; B. Mauss; D.R. Napoli; M. Niikura; J. Ojala; J. Pakarinen; X. Pereira-Lopez; P. Rahkila; F. Recchia; M. Sandzelius; J. Sarén; R. Taniuchi; H. Tann; S. Uthayakumaar; J. Uusitalo; V. Vaquero; R. Wadsworth; G. Zimba; R. Yajzey
Source
Physics Letters B, Vol 847, Iss , Pp 138249- (2023)
Subject
Language
English
ISSN
0370-2693
Abstract
Excited states in the Tz=0,−1 nuclei 62Ga and 62Ge were populated in direct reactions of relativistic radioactive ion beams at the RIBF. Coincident γ rays were measured with the DALI2+ array and uniquely assigned to the A=62 isobars. In addition, 62Ge was also studied independently at JYFL-ACCLAB using the 24Mg(40Ca,2n)62Ge fusion-evaporation reaction. The first excited T=1,Jπ=2+ states in 62Ga and 62Ge were identified at 979(1) and 965(1) keV, respectively, resolving discrepant interpretations in the literature. States beyond the first 2+ state in 62Ge were also identified for the first time in the present work. The results are compared with shell-model calculations in the fp model space. Mirror and triplet energy differences are analyzed in terms of individual charge-symmetry and charge-independence breaking contributions. The MED results confirm the shrinkage of the p-orbits' radii when they are occupied by at least one nucleon on average.