1. Low-lying intruder 1− state in 12Be and the melting of the N=8 shell closure
- Author
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Yoshiyuki Yanagisawa, K. I. Hahn, Yoshiaki Ando, S. Shimoura, Hiroyoshi Sakurai, H. Fujiwara, T. Motobayashi, Masahiro Notani, S. Ozawa, Naoki Fukuda, Toshiharu Teranishi, T. Kijima, Hironori Iwasaki, Takashi Nakamura, I. Hisanaga, Satoshi Takeuchi, Hiroyuki Sagawa, H. Akiyoshi, Zs. Fülöp, Yoshihide Higurashi, Alberto Mengoni, M. Hirai, T. Minemura, Naohito Iwasa, and M. Ishihara
- Subjects
Physics ,Nuclear and High Energy Physics ,Shell (structure) ,chemistry.chemical_element ,Coulomb excitation ,Inelastic scattering ,Coincidence ,medicine.anatomical_structure ,chemistry ,Excited state ,medicine ,Atomic physics ,Nucleus ,Carbon ,Excitation - Abstract
Inelastic scattering of the neutron-rich nucleus 12 Be on lead and carbon targets has been studied by measuring de-excitation γ rays in coincidence with scattered 12 Be. The strong γ -ray transition from the state at E x =2.68(3) MeV following E1 Coulomb excitation was observed for the lead target, leading to an assignment of J π =1 − for the excited state. The low excitation energy of this intruder 1 − state and the deduced large B (E1;0 g.s. + →1 − ) value of 0.051(13) e 2 fm 2 provide a consistent picture of the N =8 shell melting in 12 Be.
- Published
- 2000
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