Jost function description of elastic and few-body resonances

We discuss how the analysis of the zeros of the functions introduced by Jost in 1946, acting individually or collectively, provides a comprehensive framework for describing resonances in single and multichannel collisions. In particular, we propose a generalization of the Wigner threshold law that c...

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Bibliographic Details
Published in:	Radiation physics and chemistry (Oxford, England : 1993) Vol. 76; no. 3; pp. 504 - 507
Main Authors:	Macri, P.A., Sánchez Plastic, F., Barrachina, R.O.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-03-2007
Subjects:	Jost functions Resonances Wigner threshold law Wigner threshold law Resonances Jost functions 34.70.+e
Online Access:	Get full text
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Summary:	We discuss how the analysis of the zeros of the functions introduced by Jost in 1946, acting individually or collectively, provides a comprehensive framework for describing resonances in single and multichannel collisions. In particular, we propose a generalization of the Wigner threshold law that copes with some deviations recently observed in opening reaction channels. We also pay special attention to the appearance of zeros of the s-wave Jost function in the fourth quadrant of the complex momentum plane, as analysed by Nussenzveig in 1959 but erroneously ruled out in following studies.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0969-806X 1879-0895
DOI:	10.1016/j.radphyschem.2005.11.036