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Is seniority a partial dynamic symmetry in the first ν g 9/2 shell?

Morales, A.I., Benzoni, G., Watanabe, H., de Angelis, G., Nishimura, S., Coraggio, L., Gargano, A., Itaco, N., Otsuka, T., Tsunoda, Y. , Van Isacker, P., Browne, F., Daido, R., Doornenbal, P., Fang, Y., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Söderström, P.-A., Sumikama, T., Valiente-Dobón, J.J., Wu, J., Xu, Z.Y., Yagi, A., Yokoyama, R., Baba, H., Avigo, R., Bello Garrote, F.L., Blasi, N., Bracco, A., Bruce, A.M., Camera, F., Ceruti, S., Crespi, F.C.L., Delattre, M.-C., Dombradi, Zs., Gottardo, A., Isobe, T., Kojouharov, I., Kurz, N., Kuti, I., Lalkovski, S, Matsui, K., Melon, B., Mengoni, D., Miyazaki, T., Modamio-Hoybjor, V., Momiyama, S., Napoli, D.R., Niikura, M., Orlandi, R., Podolyak, Zsolt, Regan, Patrick, Sakurai, H., Sahin, E., Sohler, D., Schaffner, H., Taniuchi, R., Taprogge, J., Vajta, Zs., Wieland, O. and Yalcinkaya, M. (2018) Is seniority a partial dynamic symmetry in the first ν g 9/2 shell? Physics Letters B, 781. pp. 706-712.

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The low-lying structures of the midshell νg9/2 Ni isotopes 72Ni and 74Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following β decay of the mother nuclei 72Co and 74Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first (8+) levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron g9/2 shell. We find that the disappearance of the seniority isomerism in the View the MathML source states can be explained by a lowering of the seniority-four (6+) levels as predicted years ago. For 74Ni, the internal de-excitation pattern of the newly observed View the MathML source state supports a restoration of the normal seniority ordering up to spin J=4. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near 78Ni.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Morales, A.I.
Benzoni, G.
Watanabe, H.
de Angelis, G.
Nishimura, S.
Coraggio, L.
Gargano, A.
Itaco, N.
Otsuka, T.
Tsunoda, Y.
Van Isacker, P.
Browne, F.
Daido, R.
Doornenbal, P.
Fang, Y.
Lorusso, G.
Patel, Z.
Rice, S.
Sinclair, L.
Söderström, P.-A.
Sumikama, T.
Valiente-Dobón, J.J.
Wu, J.
Xu, Z.Y.
Yagi, A.
Yokoyama, R.
Baba, H.
Avigo, R.
Bello Garrote, F.L.
Blasi, N.
Bracco, A.
Bruce, A.M.
Camera, F.
Ceruti, S.
Crespi, F.C.L.
Delattre, M.-C.
Dombradi, Zs.
Gottardo, A.
Isobe, T.
Kojouharov, I.
Kurz, N.
Kuti, I.
Lalkovski, S
Matsui, K.
Melon, B.
Mengoni, D.
Miyazaki, T.
Modamio-Hoybjor, V.
Momiyama, S.
Napoli, D.R.
Niikura, M.
Orlandi, R.
Sakurai, H.
Sahin, E.
Sohler, D.
Schaffner, H.
Taniuchi, R.
Taprogge, J.
Vajta, Zs.
Wieland, O.
Yalcinkaya, M.
Date : 27 April 2018
DOI : 10.1016/j.physletb.2018.04.049
Copyright Disclaimer : © 2018 The Authors. Published by Elsevier B.V.This is an open access article under the CC BY license (
Depositing User : Melanie Hughes
Date Deposited : 01 May 2018 10:13
Last Modified : 24 Jul 2018 10:30

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