Sigma-Nucleus Potential in $A=28$

Sigma-Nucleus Potential in $A = 28$

H. Noumi et al.

Phys. Rev. Lett. 89, 072301 – Published 30 July 2002; Erratum Phys. Rev. Lett. 90, 049902 (2003)

Abstract

We have studied the $(π^{-}, K^{+})$ reaction on a silicon target to investigate the sigma-nucleus potential. The inclusive spectrum was measured at a beam momentum of $1.2 G e V / c$ with an energy resolution of 3.3 MeV (FWHM) by employing the superconducting kaon spectrometer system. The spectrum was compared with theoretical calculations within the framework of the distorted-wave impulse approximation, which demonstrates that a strongly repulsive sigma-nucleus potential with a nonzero size of the imaginary part reproduces the observed spectrum.