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Elsevier, Physics Letters B, 3-4(608), p. 206-214, 2005

DOI: 10.1016/j.physletb.2005.01.022

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Excited states in neutron rich boron isotopes

Journal article published in 2005 by R. Kanungo, Z. Elekes ORCID, H. Baba ORCID, Z.-S. Dombrádi, Z.-S. Fülöp, J. Gibelin ORCID, Á. Horváth, Y. Ichikawa ORCID, E. Ideguchi, N. Iwasa, H. Iwasaki, S. Kawai, Y. Kondo, T. Motobayashi, M. Notani and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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±15 keV1089±15 keV. The fragment 15B is observed abundantly associated with a gamma transition of 1336±10 keV1336±10 keV. 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=8N=8.