Jost function description of elastic and few-body resonances
- 作者：P.A. Macri ; F. Sá ; nchez Plastic ; R.O. Barrachina
- 关键词：Jost functions ; Resonances ; Wigner threshold law
- 刊名：Radiation Physics and Chemistry
- 出版年：2007
- 期刊代码：68_0969806x
- 类别：ph
- 出版时间：March 2007
- 卷：76
- 期：3
- 页码：504-507
- 文件大小：147 K
摘要
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.