Showing papers by "Herman Feshbach published in 1995"

Signatures of [Lambda]-[Sigma] mixing in the magnetic moments of hypernuclei

Abstract: We investigate the influence of hypernuclear magnetic moments of [Lambda]-[Sigma] mixing due to the strong [Lambda][ital N][leftrightarrow][Sigma][ital N] interaction. The case of a [Lambda] coupled to an [ital I]=1 nuclear core (example [sub [Lambda]][sup 15]C) is found to be a particularly sensitive probe of this mixing. Qualitative estimates indicate a significant deviation of the magnetic moment from the Schmidt values. The examples of [sub [Lambda]][sup 3]H, [sub [Lambda]][sup 4]H(1[sup +]) and [sub [Lambda]][sup 4]He(1[sup +]) have also been studied, as well as the influence of [Lambda]-[Sigma] mixing on the lifetime associated with the 1[sup +][r arrow]0[sup +] electromagnetic transition in the [ital A]=4 system. We also mention the [pi][sup +]/[pi][sup [minus]] ratio in hypernuclear weak decay as another probe of the degree of [Lambda]-[Sigma] mixing.

Statistical multistep reactions

Abstract: Collisions, appropriately interpreted, are a primary source of insights into and information regarding nuclear systems and their characteristic modes of motion. In this paper, I shall sketch a statistical approach which provides a framework for the analysis of experimental data and relates the data to fundamental nuclear properties. This theory is very general but so far has been applied mainly to neutron and proton collisions with nuclei from relatively low nucleon energies to several hundred MeV and for target nuclei covering a wide range in mass number and charge.