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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, 96 (6), 064310. 064310-1.

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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 :
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.
Utsuno, Y.
Valiente-Dobón, J.J.
Yoneda, K.
Date : 2017
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevC.96.064310
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 : 11 Dec 2018 11:23

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