학술논문
Isospin symmetry in the $T = 1, A = 62$ triplet
Document Type
Working Paper
Author
Wimmer, K.; Ruotsalainen, P.; Lenzi, S. M.; Poves, A.; Hüyük, T.; Browne, F.; Doornenbal, P.; Koiwai, T.; Arici, T.; Auranen, K.; Bentley, M. A.; Cortés, M. L.; Delafosse, C.; Eronen, T.; Ge, Z.; Grahn, T.; Greenlees, P. T.; Illana, A.; Imai, N.; Joukainen, H.; Julin, R.; Jungclaus, A.; Jutila, H.; Kankainen, A.; Kitamura, N.; Longfellow, B.; Louko, J.; Lozeva, R.; Luoma, M.; Mauss, B.; Napoli, D. R.; Niikura, M.; Ojala, J.; Pakarinen, J.; Pereira-Lopez, X.; Rahkila, P.; Recchia, F.; Sandzelius, M.; Sarén, J.; Taniuchi, R.; Tann, H.; Uthayakumaar, S.; Uusitalo, J.; Vaquero, V.; Wadsworth, R.; Zimba, G.; Yajzey, R.
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Abstract
Excited states in the $T_z = 0, -1$ nuclei $^{62}$Ga and $^{62}$Ge were populated in direct reactions of relativistic radioactive ion beams at the RIBF. Coincident \grays were measured with the DALI2$^+$ array and uniquely assigned to the $A=62$ isobars. In addition, $^{62}$Ge was also studied independently at JYFL-ACCLAB using the ${}^{24}$Mg(${}^{40}$Ca,$2n$)${}^{62}$Ge fusion-evaporation reaction. The first excited $T=1, J^\pi =2^+$ states in $^{62}$Ga and $^{62}$Ge were identified at $979(1)$ and $965(1)$~keV, respectively, resolving discrepant interpretations in the literature. States beyond the first $2^+$ state in $^{62}$Ge 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.
Comment: aceepted Phys. Lett. B
Comment: aceepted Phys. Lett. B