Low-lying structures of exotic sc isotopes and the evolution of the N = 34 subshell closure

D. Steppenbeck, S. Takeuchi, N. Aoi, P. Doornenbal, M. Matsushita, H. Wang, H. Baba, Shintaro Go, J. Lee, K. Matsui, S. Michimasa, T. Motobayashi, D. Nishimura, T. Otsuka, H. Sakurai, Y. Shiga, P. A. Söderström, T. Sumikama, R. Taniuchi, Y. Utsuno & 2 others J. J. Valiente-Dobón, K. Yoneda

Research output: Contribution to journalConference article

Abstract

Recent investigations of exotic nuclei with N = 32 and 34 have highlighted the presence of sizable subshell closures at these neutron numbers that are absent in stable isotones. Indeed, the development of the shell gap at N = 32 is now well established from studies along the calcium, titanium, and chromium isotopic chains and, more recently, below the Z = 20 core in potassium and argon isotones. The onset of a new subshell closure at N = 34 was reported in 54 Ca owing to the relatively high energy of its first 2 + state. On the theoretical side, the development of these neutron subshell gaps has been discussed, for example, in the framework of tensor-force-driven shell evolution; as protons are removed from the πf 72 orbital, the vf5 2 state becomes progressively less bound and shifts up in energy relative to the vp3 2 -vp1 2 spin-orbit partners. However, it was also reported that no significant N = 34 subshell gap exists in titanium, despite the fact that an inversion of the vf 52 and vp1 2 orbitals has been noted. Thus, the strength of the N = 34 subshell closure in the scandium isotopes, which lie between calcium and titanium, provides additional insight on the migration of the vf 52 orbital in exotic nuclei. In the present work, the low-lying structures of the neutron-rich isotopes 54 Sc, 55 Sc, and 56 Sc - investigated using in-beam γ-ray spectroscopy with fast radioactive projectiles - will be presented, and the evolution of the N = 34 subshell closure will be further examined. The results will be compared to modern shell-model calculations applied within the pf shell.

Original languageEnglish
Article number030
JournalProceedings of Science
Volume2016-September
Publication statusPublished - Jan 1 2016
Externally publishedYes
Event26th International Nuclear Physics Conference, INPC 2016 - Adelaide, Australia
Duration: Sep 11 2016Sep 16 2016

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closures
isotopes
titanium
neutrons
orbitals
scandium isotopes
calcium
nuclei
projectiles
chromium
potassium
rays
argon
tensors
inversions
orbits
protons
energy
shift
spectroscopy

All Science Journal Classification (ASJC) codes

  • General

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Steppenbeck, D., Takeuchi, S., Aoi, N., Doornenbal, P., Matsushita, M., Wang, H., ... Yoneda, K. (2016). Low-lying structures of exotic sc isotopes and the evolution of the N = 34 subshell closure. Proceedings of Science, 2016-September, [030].

Low-lying structures of exotic sc isotopes and the evolution of the N = 34 subshell closure. / Steppenbeck, D.; Takeuchi, S.; Aoi, N.; Doornenbal, P.; Matsushita, M.; Wang, H.; Baba, H.; Go, Shintaro; Lee, J.; Matsui, K.; Michimasa, S.; Motobayashi, T.; Nishimura, D.; Otsuka, T.; Sakurai, H.; Shiga, Y.; Söderström, P. A.; Sumikama, T.; Taniuchi, R.; Utsuno, Y.; Valiente-Dobón, J. J.; Yoneda, K.

In: Proceedings of Science, Vol. 2016-September, 030, 01.01.2016.

Research output: Contribution to journalConference article

Steppenbeck, D, Takeuchi, S, Aoi, N, Doornenbal, P, Matsushita, M, Wang, H, Baba, H, Go, S, Lee, J, Matsui, K, Michimasa, S, Motobayashi, T, Nishimura, D, Otsuka, T, Sakurai, H, Shiga, Y, Söderström, PA, Sumikama, T, Taniuchi, R, Utsuno, Y, Valiente-Dobón, JJ & Yoneda, K 2016, 'Low-lying structures of exotic sc isotopes and the evolution of the N = 34 subshell closure', Proceedings of Science, vol. 2016-September, 030.
Steppenbeck D, Takeuchi S, Aoi N, Doornenbal P, Matsushita M, Wang H et al. Low-lying structures of exotic sc isotopes and the evolution of the N = 34 subshell closure. Proceedings of Science. 2016 Jan 1;2016-September. 030.
Steppenbeck, D. ; Takeuchi, S. ; Aoi, N. ; Doornenbal, P. ; Matsushita, M. ; Wang, H. ; Baba, H. ; Go, Shintaro ; Lee, J. ; Matsui, K. ; Michimasa, S. ; Motobayashi, T. ; Nishimura, D. ; Otsuka, T. ; Sakurai, H. ; Shiga, Y. ; Söderström, P. A. ; Sumikama, T. ; Taniuchi, R. ; Utsuno, Y. ; Valiente-Dobón, J. J. ; Yoneda, K. / Low-lying structures of exotic sc isotopes and the evolution of the N = 34 subshell closure. In: Proceedings of Science. 2016 ; Vol. 2016-September.
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abstract = "Recent investigations of exotic nuclei with N = 32 and 34 have highlighted the presence of sizable subshell closures at these neutron numbers that are absent in stable isotones. Indeed, the development of the shell gap at N = 32 is now well established from studies along the calcium, titanium, and chromium isotopic chains and, more recently, below the Z = 20 core in potassium and argon isotones. The onset of a new subshell closure at N = 34 was reported in 54 Ca owing to the relatively high energy of its first 2 + state. On the theoretical side, the development of these neutron subshell gaps has been discussed, for example, in the framework of tensor-force-driven shell evolution; as protons are removed from the πf 72 orbital, the vf5 2 state becomes progressively less bound and shifts up in energy relative to the vp3 2 -vp1 2 spin-orbit partners. However, it was also reported that no significant N = 34 subshell gap exists in titanium, despite the fact that an inversion of the vf 52 and vp1 2 orbitals has been noted. Thus, the strength of the N = 34 subshell closure in the scandium isotopes, which lie between calcium and titanium, provides additional insight on the migration of the vf 52 orbital in exotic nuclei. In the present work, the low-lying structures of the neutron-rich isotopes 54 Sc, 55 Sc, and 56 Sc - investigated using in-beam γ-ray spectroscopy with fast radioactive projectiles - will be presented, and the evolution of the N = 34 subshell closure will be further examined. The results will be compared to modern shell-model calculations applied within the pf shell.",
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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 - 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 - Sumikama, T.

AU - Taniuchi, R.

AU - Utsuno, Y.

AU - Valiente-Dobón, J. J.

AU - Yoneda, K.

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N2 - Recent investigations of exotic nuclei with N = 32 and 34 have highlighted the presence of sizable subshell closures at these neutron numbers that are absent in stable isotones. Indeed, the development of the shell gap at N = 32 is now well established from studies along the calcium, titanium, and chromium isotopic chains and, more recently, below the Z = 20 core in potassium and argon isotones. The onset of a new subshell closure at N = 34 was reported in 54 Ca owing to the relatively high energy of its first 2 + state. On the theoretical side, the development of these neutron subshell gaps has been discussed, for example, in the framework of tensor-force-driven shell evolution; as protons are removed from the πf 72 orbital, the vf5 2 state becomes progressively less bound and shifts up in energy relative to the vp3 2 -vp1 2 spin-orbit partners. However, it was also reported that no significant N = 34 subshell gap exists in titanium, despite the fact that an inversion of the vf 52 and vp1 2 orbitals has been noted. Thus, the strength of the N = 34 subshell closure in the scandium isotopes, which lie between calcium and titanium, provides additional insight on the migration of the vf 52 orbital in exotic nuclei. In the present work, the low-lying structures of the neutron-rich isotopes 54 Sc, 55 Sc, and 56 Sc - investigated using in-beam γ-ray spectroscopy with fast radioactive projectiles - will be presented, and the evolution of the N = 34 subshell closure will be further examined. The results will be compared to modern shell-model calculations applied within the pf shell.

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