S-matrix andR-matrix determination of the low-energy5He and5Li resonance parameters

1996/08/31 by Attila Csótó, Attila Csoto, G. M. Hale · 5 citations
Physics and Astronomy · #Advanced Chemical Physics Studies #Atomic and Molecular Physics #Nuclear physics research studies #nucl-th

paper · pdf · doi:10.1103/physrevc.55.536

published as Phys.Rev.C55:536-539,1997 · 9 pages, 1 figure. Final version. Slightly rewritten, results and conclusions unchanged

arxiv created 1996/10/23 · openalex publication_date 1997/01/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04

Abstract

We study the low-energy 3/2^\ensuremath- and 1/2^\ensuremath- states of ⁵He and ⁵Li in a microscopic cluster model. The scattering phase shifts of Bond (\ensuremathα+n) and of Schwandt (\ensuremathα+p), respectively, are well reproduced. 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, that 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 that works at complex energies.

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