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

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Abstract

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.

Original languageEnglish
Article number014301
Pages (from-to)143011-1430111
Number of pages1287101
JournalPhysical Review C - Nuclear Physics
Volume66
Issue number1
DOIs
Publication statusPublished - Jul 1 2002
Externally publishedYes

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