S-matrix and R-matrix determination of the low-energy He-5 and Li-5 resonance parameters

Details S-matrix and R-matrix determination of the low-energy He-5 and Li-5 resonance parameters S-matrix and R-matrix determination of the low-energy He-5 and Li-5 resonance parameters

1996-08-05

arxiv.org/abs/nucl-th/9608007v2

Phys.Rev.C55:536-539,1997

Physics

Nuclear Physics

Nuclear Theory

9 pages, 1 figure. Final version. Slightly rewritten, results and conclusions unchanged

Scientific paper

10.1103/PhysRevC.55.536

We study the low-energy 3/2- and 1/2- states of He-5 and Li-5 in a microscopic cluster model. The scattering phase shifts of Bond (alpha+n) and of Schwandt (alpha+p), respectively, are reproduced well. We determine the resonance parameters by localizing the poles of the analytically continued S-matrix at complex energies. Our results differ from conventional R-matrix resonance parameters, which were extracted from experimental data using the definition of a resonance based on the positions and widths of reaction cross section peaks. However, they nicely agree with the results of an extended R-matrix method which works at complex energies.

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