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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. , 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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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 :
Lizarazo, C.
Soderstrom, P.A
Werner, V.
Pietralla, N.
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.
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

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