Formation of eta-mesic nuclei by (pi,N) reaction and N^*(1535) in medium

Details Formation of eta-mesic nuclei by (pi,N) reaction and N^*(1535) in medium Formation of eta-mesic nuclei by (pi,N) reaction and N^*(1535) in medium

2008-11-27

arxiv.org/abs/0811.4516v1

Phys.Rev.C80:025205,2009

Physics

Nuclear Physics

Nuclear Theory

12 pages, 10 figures

Scientific paper

10.1103/PhysRevC.80.025205

We calculate formation spectra of eta-nucleus systems in (pi,N) reactions with nuclear targets, which can be performed at existing and/or forthcoming facilities, including J-PARC, in order to investigate eta-nucleus interactions. Based on the N^*(1535) dominance in the eta N system, eta-mesic nuclei are suitable systems for study of in-medium properties of the N^*(1535) baryon resonance, such as reduction of the mass difference of N and N^* in nuclear medium, which affects level structure of the eta and N^*-hole modes. We find that clear information on the in-medium N^*- and eta-nucleus interactions can be obtained through the formation spectra of the eta-mesic nuclei. We also discuss the experimental feasibilities by showing several spectra of (pi,N) reactions calculated with possible experimental settings. Coincident measurements of pi N pairs from the N^* decays in nuclei help us to reduce backgrounds.

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