Strength of the $��$ Single-Particle Potential in Nuclei From Semiclassical Distorted Wave Model Analysis of $(��^-,K^+)$ Inclusive Spectrum

Semiclassical distorted wave model is developed to describe $(��^-,K^+)$ inclusive spectra related to $��^-$-formation measured at KEK with $p_��=1.2$ GeV/c. The shape and magnitude of the spectrum on $^{28}$Si target are satisfactorily reproduced by a repulsive $��$-nucleus potential, the strength of which is of the order of 30$\sim$50 MeV. This strength is not so strong as more than 100 MeV suggested by the estimation presented in the report of the experiment.
6 pages, to be published in Prog. Theor. Phys