Journal
PHYSICS LETTERS B
Volume 683, Issue 2-3, Pages 129-133Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2009.12.016
Keywords
Neutron Spectroscopy; Neutron Drip Line; Virtual State; Exotic Nuclei
Funding
- National Science Foundation [PHY-05-55488, PHY-05-55439, PHY-06-51627, PHY-06-06007]
- Division Of Physics
- Direct For Mathematical & Physical Scien [855456] Funding Source: National Science Foundation
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The decay of the neutron unbound ground state of B-18 was studied for the first time through a single-proton knockout reaction from a 62 MeV/u C-19 beam. The decay energy spectrum was reconstructed from coincidence measurements between the emitted neutron and the B-17 fragment using the MoNA/Sweeper setup. An s-wave line shape was used to describe the experimental spectrum resulting in an upper limit for the scattering length of -50 fm which corresponds to a decay energy <10 keV. Observing an s-wave decay of B-18 provides an experimental verification that the ground state of C-19 includes a large s-wave component. The presence of this s-wave component shows that s-d mixing is still present in B-18 and that the s(1/2) orbital has not moved significantly below the d(5/2) orbital. (C) 2009 Elsevier B.V. All rights reserved.
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