1. In-Beam γ-Ray Spectroscopy of Mg34,36,38: Merging the N=20 and N=28 Shell Quenching
- Author
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Doornenbal, P, Scheit, H, Takeuchi, S, 聡, 武内, Aoi, N, 青井考, Li, K, 李闊昂, Matsushita, M, 松下昌史, Steppenbeck, D, Wang, H, 王赫, Baba, H, 馬場秀忠, Crawford, H, Hoffman, CR, Hughes, R, Ideguchi, E, 井手口栄治, Kobayashi, N, 小林信之, Kondo, Y, 近藤洋介, Lee, J, 李曉菁, Michimasa, S, 道正新一郎, Motobayashi, T, 本林透, Sakurai, H, 櫻井博儀, Takechi, M, 武智麻耶, Togano, Y, 栂野泰宏, Winkler, R, Yoneda, K, and 米田健一郎
- Subjects
Nuclear and Plasma Physics ,Synchrotrons and Accelerators ,Physical Sciences ,Mathematical Sciences ,Engineering ,General Physics ,Mathematical sciences ,Physical sciences - Abstract
Neutron-rich N=22, 24, 26 magnesium isotopes were studied via in-beam γ-ray spectroscopy at the RIKEN Radioactive Isotope Beam Factory following secondary fragmentation reactions on a carbon target at ≈200 MeV/nucleon. In the one- and two-proton removal channels from 39Al and 40Si beams, two distinct γ-ray transitions were observed in 38Mg, while in the one-proton removal reaction from 37Al a new transition was observed in addition to the known 2(1)(+)→0(g.s.)(+) decay. From the experimental systematics and comparison to theoretical predictions it is concluded that the transitions belong to the 2(1)(+)→0(g.s.)(+) and 4(1)(+)→2(1)(+) decays in 36Mg and 38Mg, respectively. For 34Mg, previously reported 2(1)(+) and 4(1)(+) level energies were remeasured. The deduced E(4(1)(+))/E(2(1)(+)) ratios for 34,36,38Mg of 3.14(5), 3.07(5), and 3.07(5) are almost identical and suggest the emergence of a large area of deformation extending from the N=20 to the N=28 shell quenching.
- Published
- 2013