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

D. Steppenbeck, S. Takeuchi, N. Aoi, P. Doornenbal, M. Matsushita, H. Wang, H. Baba, S. Go, J. D. Holt, J. Lee, K. Matsui, S. Michimasa, T. Motobayashi, D. Nishimura, T. Otsuka, H. Sakurai, Y. Shiga, P. A. Söderström, S. R. Stroberg, T. SumikamaR. Taniuchi, J. A. Tostevin, Y. Utsuno, J. J. Valiente-Dobón, K. Yoneda

研究成果: ジャーナルへの寄稿学術誌査読

15 被引用数 (Scopus)

抄録

The low-lying structure of Sc55 has been investigated using in-beam γ-ray spectroscopy with the Be9(Ti56,Sc55+γ)X one-proton removal and Be9(Sc55,Sc55+γ)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 γγ coincidence relationships and γ-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 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 1/21+ and 3/21+ 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 πf7/2 orbital.

本文言語英語
論文番号064310
ジャーナルPhysical Review C
96
6
DOI
出版ステータス出版済み - 12月 11 2017
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学

フィンガープリント

「Structure of Sc 55 and development of the N=34 subshell closure」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル