Anomaly of [Formula Presented] shell closure in neutron-rich Be and B isotopes studied via delayed neutron emitting [Formula Presented] 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

Research output: Contribution to journalArticlepeer-review

Abstract

We investigated the [Formula Presented] decay of the neutron drip line nucleus [Formula Presented] by means of double and triple coincidence measurements of [Formula Presented] rays, delayed neutrons, and [Formula Presented] 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 [Formula Presented] state in [Formula Presented] with a branching ratio of [Formula Presented] which subsequently emits a delayed neutron with an energy of [Formula Presented] The excitation energy and width of the [Formula Presented] state were determined to be [Formula Presented] and [Formula Presented] respectively. The excitation energy and width of this level as well as the [Formula Presented] value were treated in terms of a simple shell model and found to be strongly related to the [Formula Presented] shell gap quenching [Formula Presented] and [Formula Presented].

Original languageEnglish
Number of pages1
JournalPhysical Review C - Nuclear Physics
Volume66
Issue number1
DOIs
Publication statusPublished - Jan 1 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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