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, Takashi 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

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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.

元の言語英語
記事番号014301
ページ(範囲)143011-1430111
ページ数1287101
ジャーナルPhysical Review C - Nuclear Physics
66
発行部数1
DOI
出版物ステータス出版済み - 7 1 2002
外部発表Yes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Aoi, N., Yoneda, K., Ideguchi, E., Kishida, T., Nakamura, T., Notani, M., Sakurai, H., Teranishi, T., Watanabe, Y., Wu, H., Yoshida, A., Miyatake, H., Yamamoto, Y., Ogawa, H., Yamamoto, S. S., & Ishihara, M. (2002). Anomaly of N = 8 shell closure in neutron-rich Be and B isotopes studied via delayed neutron emitting 14Be β decay. Physical Review C - Nuclear Physics, 66(1), 143011-1430111. [014301]. https://doi.org/10.1103/PhysRevC.66.014301