Identification of an oblate K-isomer of 94Se60 and implications for a ground-state shape transition between N = 58 - 60

Lizarazo, C., Soderstrom, P.A, Werner, V., Pietralla, N., Walker, P., Dong, G.X, Xu, F.R, Rodriguez, T.R, Browne, F., Doornenbal, P. et al, Nishimura, S., Nita, C.R, Obertelli, A., Ando, T., Arici, T., Authelet, G., Baba, H., Blazhev, A., Bruce, A.M, Calvet, D., Caroll, R.J, Chateau, F., Chen, S., Chung, L.X, Corsi, A., Cortes, M.L, Delbart, A., Dewald, M., Ding, B., Flavigny, F., Franchoo, S., Gerl, J., Gheller, J.M, Giagnon, A., Gillibert, A., Gorska, M., Gottardo, A., Kojouharov, I., Kurz, N., Lapoux, V., Lee, J., Lettmann, M., Linh, B.D, Liu, J.J, Liu, Z., Momiyama, S., Moschner, K., Motobayashi, T., Nagamine, S., Nakatsuka, N., Niikura, M., Nobs, C., Olivier, L., Patel, Z., Paul, N., Podolyak, Zsolt, Rousse, J.Y, Rudigier, M., Saito, T.Y, Sakurai, H., Santamaria, C., Schaffner, H., Shand, C., Stefan, I., Steppenbeck, D., Taniuchi, R., Uesaka, T., Vaquero, V., Wimmer, K. and Xu, Z. (2020) Identification of an oblate K-isomer of 94Se60 and implications for a ground-state shape transition between N = 58 - 60 Physical Review Letters.

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Abstract

In this letter we report on new information on the shape evolution of the very neutron-rich 92;94Se nuclei from an isomer-decay spectroscopy experiment at the Radioactive Isotope Beam Factory at RIKEN. High-resolution germanium detectors were used to identify delayed -rays emitted following the decay of these nuclei. New transitions are reported extending the previously known level schemes. The isomeric levels are interpreted as originating from high-K quasi-neutron states with an oblate deformation of B ~ - 0:25, with the high-K state in 94Se being metastable and K hindered. Following this, 94Se is the lowest-mass nucleus known to date with K-forbidden decay and a substantial K hindrance. Furthermore, it is the first observation of an oblate K isomer in a deformed nucleus. From the decay patterns, an oblate deformation is suggested for the 94Se60 ground-state band, in line with the predictions of recent beyond-mean-field calculations.

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Physics
Authors :	Name Email ORCID Lizarazo, C. Soderstrom, P.A Werner, V. Pietralla, N. Walker, P. P.Walker@surrey.ac.uk Dong, G.X Xu, F.R Rodriguez, T.R Browne, F. Doornenbal, P. Nishimura, S. Nita, C.R Obertelli, A. Ando, T. Arici, T. Authelet, G. Baba, H. Blazhev, A. Bruce, A.M Calvet, D. Caroll, R.J Chateau, F. Chen, S. Chung, L.X Corsi, A. Cortes, M.L Delbart, A. Dewald, M. Ding, B. Flavigny, F. Franchoo, S. Gerl, J. Gheller, J.M Giagnon, A. Gillibert, A. Gorska, M. Gottardo, A. Kojouharov, I. Kurz, N. Lapoux, V. Lee, J. Lettmann, M. Linh, B.D Liu, J.J Liu, Z. Momiyama, S. Moschner, K. Motobayashi, T. Nagamine, S. Nakatsuka, N. Niikura, M. Nobs, C. Olivier, L. Patel, Z. Paul, N. Podolyak, Zsolt Z.Podolyak@surrey.ac.uk Rousse, J.Y Rudigier, M. Saito, T.Y Sakurai, H. Santamaria, C. Schaffner, H. Shand, C. Stefan, I. Steppenbeck, D. Taniuchi, R. Uesaka, T. Vaquero, V. Wimmer, K. Xu, Z.
Date :	13 May 2020
Funders :	German BMBF, ERC, Spanish MEC, STFC
Grant Title :	German BMBF Grant
Depositing User :	James Marshall
Date Deposited :	03 Jun 2020 15:12
Last Modified :	03 Jun 2020 15:12
URI:	http://epubs.surrey.ac.uk/id/eprint/857057

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