Spectroscopy of $^{65,67}_{25}$Mn: Strong coupling in the $N = 40$ “island of inversion”

• Published in: Physics letters. B 2018, Vol.784, p.392-396
• Main Authors: Liu, X.Y., Liu, Z., Ding, B., Doornenbal, P., Obertelli, A., Lenzi, S.M., Walker, P.M., Chung, L.X., Linh, B.D., Authelet, G., Baba, H., Calvet, D., Château, F., Corsi, A., Delbart, A., Gheller, J.-M., Gillibert, A., Isobe, T., Lapoux, V., Matsushita, M., Momiyama, S., Motobayashi, T., Niikura, M., Nowacki, F., Otsu, H., Péron, C., Peyaud, A., Pollacco, E.C., Roussé, J.-Y., Sakurai, H., Sasano, M., Shiga, Y., Takeuchi, S., Taniuchi, R., Uesaka, T., Wang, H., Yoneda, K., Lam, Y.H., Huang, T.H., Sun, M.D., Zhang, W.Q., Lu, H.Y., Hou, D.S., Browne, F., Dombradi, Zs, Franchoo, S., Giacoppo, F., Gottardo, A., Hadynska-Klek, K., Korkulu, Z., Koyama, S., Kubota, Y., Lee, J., Lettmann, M., Lozeva, R., Matsui, K., Miyazaki, T., Nishimura, S., Louchart, C., Olivier, L., Ota, S., Patel, Z., Sahin, E., Santamaria, C., Shand, C., Söderström, P.-A., Stefan, G.L., Steppenbeck, D., Sumikama, T., Suzuki, D., Vajta, Zs, Werner, V., Wu, J., Xu, Z., Zhou, X.H., Zhang, Y.H., Xu, H.S., Zhang, F.S.
• Format: Article
• Language: English
• Subjects: Nuclear Experiment; Physics
• ISSN: 0370-2693
• DOI: 10.1016/j.physletb.2018.06.067

Excited states in 63,65,67 Mn were studied via in-beam γ -ray spectroscopy following knockout reactions from 68 Fe. Similar level schemes, consisting of the 11/2 − , 9/2 − , 7/2 − and 5/2 g.s.− level sequence, connected by I→I−1 transitions, were established, the first time for 65,67 Mn. Their level structures show features consistent with strongly-coupled rotational bands with K=5/2 . State-of-the-art shell-model calculations with the modified LNPS effective interaction reproduce the observed levels remarkably well and suggest the dominance of 4-particle-4-hole neutron configurations for all the states. The data on the low-lying excited states of odd-mass 53−67 Mn provide a textbook example of nuclear structure evolution from weak coupling through decoupling to strong coupling along a single isotopic chain on the n-rich side of the β stability line. These results help to deepen our understanding of the N=40 “island of inversion”.