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 a_s<-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.

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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