Low-lying intruder 1- state in 12Be and the melting of the N = 8 shell closure

H. Iwasaki, T. Motobayashi, H. Akiyoshi, Y. Ando, N. Fukuda, H. Fujiwara, Zs Fülöp, K. I. Hahn, Y. Higurashi, M. Hirai, I. Hisanaga, N. Iwasa, T. Kijima, A. Mengoni, T. Minemura, T. Nakamura, M. Notani, S. Ozawa, H. Sagawa, H. SakuraiS. Shimoura, S. Takeuchi, T. Teranishi, Y. Yanagisawa, M. Ishihara

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Abstract

Inelastic scattering of the neutron-rich nucleus 12Be on lead and carbon targets has been studied by measuring de-excitation γ rays in coincidence with scattered 12Be. The strong γ-ray transition from the state at E(x) = 2.68(3) MeV following El Coulomb excitation was observed for the lead target, leading to an assignment of J(π) = I- 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)e2 fm2 provide a consistent picture o the N = 8 shell melting in 12Be. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)8-14
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume491
Issue number1-2
DOIs
Publication statusPublished - Oct 12 2000

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Iwasaki, H., Motobayashi, T., Akiyoshi, H., Ando, Y., Fukuda, N., Fujiwara, H., Fülöp, Z., Hahn, K. I., Higurashi, Y., Hirai, M., Hisanaga, I., Iwasa, N., Kijima, T., Mengoni, A., Minemura, T., Nakamura, T., Notani, M., Ozawa, S., Sagawa, H., ... Ishihara, M. (2000). Low-lying intruder 1- state in 12Be and the melting of the N = 8 shell closure. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 491(1-2), 8-14. https://doi.org/10.1016/S0370-2693(00)01017-0