Spectroscopy of 13B, 14B, 15B and 16B using multi-nucleon transfer reactions
R. Kalpakchieva1 - H.G. Bohlen2 - W. von Oertzen2 - B. Gebauer2 - M. von Lucke-Petsch2 - T.N. Massey3 - A.N. Ostrowski4 - Th. Stolla2 - M. Wilpert2 - Th. Wilpert2
1 Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Moscow region, Russia
2 Hahn-Meitner Institut GmbH, Glienicker Strasse 100, 14109 Berlin, Germany
3 Department of Physics and Astronomy, Ohio University, Athens, OH 45701-2979, USA
4 Department of Physics and Astronomy, The University of Edinburgh, Edinburgh, EH9 3J2, UK
Received: 27 December 1999 / Revised version: 11 February 2000 Communicated by D. Schwalm
Abstract
New information has been obtained on excited states of the neutron-rich boron isotopes
14B, 15B and 16B, using the reactions 12C(14C,12N)14B,
13C(14C,12N)15B and 14C(14C,12N)16B at about 24 MeV/A. The
mass excess of 16B has been measured for the first time, it is 37.08(6) MeV. This means that
16B is unbound by only 0.04(6) MeV. Furthermore, the nucleus 13B has been investigated with
the four reactions 16O(14C,17F), 12C(14C,13N),
12C(13C,12N) and 12C(15N,14O). Choosing different target-projectile
combinations, it was possible to populate states with different selectivity. New states are observed in
13B at excitation energies above the threshold for two-neutron decay.
PACS
21.10.-k Properties of nuclei; nuclear energy levels -
21.10.Dr Binding energies and masses -
25.70.Hi Transfer reactions -
27.20.+n
Copyright Società Italiana di Fisica, Springer-Verlag 2000
