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Structure of 55Sc and development of the N=34 subshell closure

Steppenbeck, D., Takeuchi, S., Aoi, N., Doornenbal, P., Matsushita, M., Wang, H., Baba, H., Go, S., Holt, J.D., Lee, J. , Matsui, K, Michimasa, S., Motobayashi, T., Nishimura, D., Otsuka, T, Sakurai, H., Shiga, Y., Söderström, P-A., Stroberg, S.R., Sumikama, T, Taniuchi, R., Tostevin, Jeffrey, Utsuno, Y., Valiente-Dobón, J.J. and Yoneda, K. (2017) Structure of 55Sc and development of the N=34 subshell closure Physical Review C.

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Abstract

The low-lying structure of 55Sc has been investigated using in-beam \gamma-ray spectroscopy with the 9Be(56Ti,55Sc+\gamma)X one-proton removal and 9Be(55Sc,55Sc+\gamma)X inelastic-scattering reactions at the RIKEN Radioactive Isotope Beam Factory. Transitions with energies of 572(4), 695(5), 1539(10), 1730(20), 1854(27), 2091(19), 2452(26), and 3241(39) keV are reported, and a level scheme has been constructed using \gamma\gamma coincidence relationships and \gamma-ray relative intensities. The results are compared to large-scale shell-model calculations in the sd-pf model space, which account for positive-parity states from proton-hole cross-shell excitations, and to {\it ab initio} shell-model calculations from the in-medium similarity renormalization group that includes three-nucleon forces explicitly. The results of proton-removal reaction theory with the eikonal model approach were adopted to aid identification of positive-parity states in the level scheme; experimental counterparts of theoretical 1/2+1 and 3/2+1 states are suggested from measured decay patterns. The energy of the first 3/2- state, which is sensitive to the neutron shell gap at the Fermi surface, was determined. The result indicates a rapid weakening of the N=34 subshell closure in pf-shell nuclei at Z>20, even when only a single proton occupies the \pi f7/2 orbital.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Steppenbeck, D.UNSPECIFIEDUNSPECIFIED
Takeuchi, S.UNSPECIFIEDUNSPECIFIED
Aoi, N.UNSPECIFIEDUNSPECIFIED
Doornenbal, P.UNSPECIFIEDUNSPECIFIED
Matsushita, M.UNSPECIFIEDUNSPECIFIED
Wang, H.UNSPECIFIEDUNSPECIFIED
Baba, H.UNSPECIFIEDUNSPECIFIED
Go, S.UNSPECIFIEDUNSPECIFIED
Holt, J.D.UNSPECIFIEDUNSPECIFIED
Lee, J.UNSPECIFIEDUNSPECIFIED
Matsui, KUNSPECIFIEDUNSPECIFIED
Michimasa, S.UNSPECIFIEDUNSPECIFIED
Motobayashi, T.UNSPECIFIEDUNSPECIFIED
Nishimura, D.UNSPECIFIEDUNSPECIFIED
Otsuka, TUNSPECIFIEDUNSPECIFIED
Sakurai, H.UNSPECIFIEDUNSPECIFIED
Shiga, Y.UNSPECIFIEDUNSPECIFIED
Söderström, P-A.UNSPECIFIEDUNSPECIFIED
Stroberg, S.R.UNSPECIFIEDUNSPECIFIED
Sumikama, TUNSPECIFIEDUNSPECIFIED
Taniuchi, R.UNSPECIFIEDUNSPECIFIED
Tostevin, JeffreyJ.Tostevin@surrey.ac.ukUNSPECIFIED
Utsuno, Y.UNSPECIFIEDUNSPECIFIED
Valiente-Dobón, J.J.UNSPECIFIEDUNSPECIFIED
Yoneda, K.UNSPECIFIEDUNSPECIFIED
Date : 2017
Copyright Disclaimer : © 2017 American Physical Society. This work is licensed under the Creative Commons Attribution 3.0 International License.
Depositing User : Clive Harris
Date Deposited : 18 Oct 2017 15:07
Last Modified : 31 Oct 2017 19:31
URI: http://epubs.surrey.ac.uk/id/eprint/842570

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