Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2009-08-28
Nucl.Phys.A829:100-125,2009
Physics
Nuclear Physics
Nuclear Theory
Scientific paper
10.1016/j.nuclphysa.2009.08.005
We study a production of Coulomb-assisted $\Sigma^-$-nucleus bound states by nuclear ($K^-$, $\pi^+$) reactions within a distorted-wave impulse approximation, so as to examine several types of the $\Sigma$-nucleus potentials that are consistent with the available $\Sigma^-$ atomic X-ray data and nuclear ($\pi^-$, $K^+$) data. We theoretically demonstrate the inclusive ($K^-$, $\pi^+$) spectra of the $\Sigma^-$ unstable bound states on $^{28}$Si, $^{58}$Ni, and $^{208}$Pb targets at incident $K^-$ lab momenta $p_{K}= 400\text{--}800$ MeV/c. The results show that the near-recoilless ($K^-$, $\pi^+$) reaction on the $^{58}$Ni target gives a clear candidate to confirm properties of the $\Sigma$-nucleus potentials having a repulsion inside the nuclear surface and an attraction outside the nucleus with a sizable absorption, whereas details of the repulsion of the potential at the nuclear center cannot be determined by the inclusive spectra. This is a promising attempt to extract properties of the $\Sigma$-nucleus potential in the nucleus at forthcoming J-PARC experiments, as a full complement to the analyses of the $\Sigma^-$ atomic and ($\pi^-$, $K^+$) data.
Harada Toru
Hirabayashi Yoshiharu
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