First evidence for low lying s-wave strength in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>13</mn></mrow></msup></mrow><mi mathvariant="normal">Be</mi></math>

M. Thoennessen; S. Yokoyama; P. G. Hansen

doi:10.1103/PhysRevC.63.014308

First evidence for low lying s-wave strength in $^{13} Be$

M. Thoennessen, S. Yokoyama, and P. G. Hansen

Phys. Rev. C 63, 014308 – Published 15 December 2000

Abstract

The particle-unbound nucleus $^{13} Be$ 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 $^{13} Be$ would make it unbound with respect to $^{12} Be$ and a neutron by $< 200 keV .$

Received 2 October 2000

DOI:https://doi.org/10.1103/PhysRevC.63.014308

Authors & Affiliations

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

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

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Vol. 63, Iss. 1 — January 2001

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Physical Review C

covering nuclear physics