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, Shintaro 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. Sumikama & 5 others R. Taniuchi, J. A. Tostevin, Y. Utsuno, J. J. Valiente-Dobón, K. Yoneda

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Abstract

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.

Original languageEnglish
Article number064310
JournalPhysical Review C
Volume96
Issue number6
DOIs
Publication statusPublished - Dec 11 2017

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closures
protons
rays
parity
industrial plants
radioactive isotopes
Fermi surfaces
inelastic scattering
neutrons
orbitals
nuclei
energy
decay
spectroscopy
excitation

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Steppenbeck, D., Takeuchi, S., Aoi, N., Doornenbal, P., Matsushita, M., Wang, H., ... Yoneda, K. (2017). Structure of Sc 55 and development of the N=34 subshell closure. Physical Review C, 96(6), [064310]. https://doi.org/10.1103/PhysRevC.96.064310

Structure of Sc 55 and development of the N=34 subshell closure. / Steppenbeck, D.; Takeuchi, S.; Aoi, N.; Doornenbal, P.; Matsushita, M.; Wang, H.; Baba, H.; Go, Shintaro; 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, J. A.; Utsuno, Y.; Valiente-Dobón, J. J.; Yoneda, K.

In: Physical Review C, Vol. 96, No. 6, 064310, 11.12.2017.

Research output: Contribution to journalArticle

Steppenbeck, D, Takeuchi, S, Aoi, N, Doornenbal, P, Matsushita, M, Wang, H, Baba, H, Go, S, Holt, JD, Lee, J, Matsui, K, Michimasa, S, Motobayashi, T, Nishimura, D, Otsuka, T, Sakurai, H, Shiga, Y, Söderström, PA, Stroberg, SR, Sumikama, T, Taniuchi, R, Tostevin, JA, Utsuno, Y, Valiente-Dobón, JJ & Yoneda, K 2017, 'Structure of Sc 55 and development of the N=34 subshell closure', Physical Review C, vol. 96, no. 6, 064310. https://doi.org/10.1103/PhysRevC.96.064310
Steppenbeck D, Takeuchi S, Aoi N, Doornenbal P, Matsushita M, Wang H et al. Structure of Sc 55 and development of the N=34 subshell closure. Physical Review C. 2017 Dec 11;96(6). 064310. https://doi.org/10.1103/PhysRevC.96.064310
Steppenbeck, D. ; Takeuchi, S. ; Aoi, N. ; Doornenbal, P. ; Matsushita, M. ; Wang, H. ; Baba, H. ; Go, Shintaro ; 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, J. A. ; Utsuno, Y. ; Valiente-Dobón, J. J. ; Yoneda, K. / Structure of Sc 55 and development of the N=34 subshell closure. In: Physical Review C. 2017 ; Vol. 96, No. 6.
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abstract = "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.",
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AU - Steppenbeck, D.

AU - Takeuchi, S.

AU - Aoi, N.

AU - Doornenbal, P.

AU - Matsushita, M.

AU - Wang, H.

AU - Baba, H.

AU - Go, Shintaro

AU - Holt, J. D.

AU - Lee, J.

AU - Matsui, K.

AU - Michimasa, S.

AU - Motobayashi, T.

AU - Nishimura, D.

AU - Otsuka, T.

AU - Sakurai, H.

AU - Shiga, Y.

AU - Söderström, P. A.

AU - Stroberg, S. R.

AU - Sumikama, T.

AU - Taniuchi, R.

AU - Tostevin, J. A.

AU - Utsuno, Y.

AU - Valiente-Dobón, J. J.

AU - Yoneda, K.

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N2 - 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.

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