Anomaly of N = 8 shell closure in neutron-rich Be and B isotopes studied via delayed neutron emitting 14Be β decay

N. Aoi, K. Yoneda, E. Ideguchi, T. Kishida, T. Nakamura, M. Notani, H. Sakurai, T. Teranishi, Y. Watanabe, H. Wu, A. Yoshida, H. Miyatake, Y. Yamamoto, H. Ogawa, S. S. Yamamoto, M. Ishihara

研究成果: Contribution to journalArticle査読

43 被引用数 (Scopus)

抄録

We investigated the β decay of the neutron drip line nucleus 14Be by means of double and triple coincidence measurements of β rays, delayed neutrons, and γ rays. The decay sequences were established and new values of the half-life and branching ratios were obtained. The decay scheme obtained is characterized by a single dominant branch leading to a 1+ state in 14B with a branching ratio of (91±9)%, which subsequently emits a delayed neutron with an energy of 288±8 keV. The excitation energy and width of the 1+ state were determined to be 1.28±0.02 MeV and 49±2 keV, respectively. The excitation energy and width of this level as well as the log ft value were treated in terms of a simple shell model and found to be strongly related to the N = 8 shell gap quenching in 13,14B and 12Be.

本文言語英語
論文番号014301
ページ(範囲)143011-1430111
ページ数1287101
ジャーナルPhysical Review C - Nuclear Physics
66
1
DOI
出版ステータス出版済み - 7 1 2002
外部発表はい

All Science Journal Classification (ASJC) codes

  • 核物理学および高エネルギー物理学

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