Lifetime of the isomeric 02+ state in 12Be

S. Shimoura, S. Ota, K. Demichi, N. Aoi, H. Baba, Z. Elekes, T. Fukuchi, T. Gomi, K. Hasegawa, E. Ideguchi, M. Ishihara, N. Iwasa, H. Iwasaki, S. Kanno, S. Kubono, K. Kurita, M. Kurokawa, Y. U. Matsuyama, S. Michimasa, K. MillerT. Minemura, T. Motobayashi, T. Murakami, M. Notani, A. Odahara, A. Saito, H. Sakurai, E. Takeshita, S. Takeuchi, M. Tamaki, T. Teranishi, K. Yamada, Y. Yanagisawa, I. Hamamoto

研究成果: Article査読

70 被引用数 (Scopus)


Mean lifetime τ of the isomeric 02+ state in 12Be has been determined by measuring decay spectra of delayed γ-rays from stopped 12Be nuclei produced by the projectile fragmentation of 18O at 100 A MeV. A consistent value of τ = 331 ± 12   ns was obtained from the time spectra of the E2 γ decay to the 21+ state and the positron annihilation following the E0 decay to the ground state. Based on the observed branching ratio between the E2 and E0 decays, transition strengths of the two decay modes were deduced to be B (E 2 ; 02+ → 21+) = 7.0 ± 0.6   e2 fm4 and | 〈 02+ | ∑i ei ri2 | 01+ 〉 | = 0.87 ± 0.03   e fm2, respectively.

ジャーナルPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
出版ステータスPublished - 2007 10 11

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学


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