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 language | English |
|---|---|
| Article number | 030 |
| Journal | Proceedings of Science |
| Volume | 2016-September |
| Publication status | Published - Jan 1 2016 |
| Externally published | Yes |
| Event | 26th International Nuclear Physics Conference, INPC 2016 - Adelaide, Australia Duration: Sep 11 2016 → Sep 16 2016 |
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All Science Journal Classification (ASJC) codes
- General
Cite this
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 journal › Conference article
}
TY - JOUR
T1 - Low-lying structures of exotic sc isotopes and the evolution of the N = 34 subshell closure
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.
PY - 2016/1/1
Y1 - 2016/1/1
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.
AB - 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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M3 - Conference article
VL - 2016-September
JO - Proceedings of Science
JF - Proceedings of Science
SN - 1824-8039
M1 - 030
ER -