Elsevier

Physics Letters B

Volume 608, Issues 3–4, 24 February 2005, Pages 206-214
Physics Letters B

Excited states in neutron rich boron isotopes

https://doi.org/10.1016/j.physletb.2005.01.022Get rights and content
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Abstract

New experimental results on in-beam gamma spectroscopy of neutron rich boron isotopes are presented for 17B and its neutron removal fragments 14,15B, after scattering with a H2 target. A gamma transition for 17B is observed at 1089±15keV. The fragment 15B is observed abundantly associated with a gamma transition of 1336±10keV. This suggests for the first time a core-excited structure for 17B thereby providing a new insight into its structure. Observations for 12,14B are also presented. The data set provides a useful systematic study of first excited states of neutron rich boron isotopes showing the dramatic drop in excitation energy beyond N=8.

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Present address: Argonne National Laboratory, 9700S. Cass Avenue, Argonne, IL 60439, USA.