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Phys. Rev. C 63, 014308 (2000) [3 pages]

First evidence for low lying s-wave strength in 13Be

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M. Thoennessen, S. Yokoyama *, and P. G. Hansen
National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824

Received 2 October 2000; published 15 December 2000

The particle-unbound nucleus 13Be was populated in fragmentation reactions using the method of sequential-neutron-decay-spectroscopy at 0°. The observed central peak in the relative velocity spectrum is most likely first evidence for low lying s-wave strength with a scattering length of as<-10 fm. This virtual state as the ground state of 13Be would make it unbound with respect to 12Be and a neutron by <200 keV.


©2000 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.63.014308
DOI: 10.1103/PhysRevC.63.014308
PACS: 27.20.+n, 21.10.Dr, 25.70.Mn

* Present address: UM Medical Center, Dept. of Radiation Oncology, Physics Division, University of Michigan, Ann Arbor, MI 48109.

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