We study phenomenologically inclusive spectra of the 6Li(π−, K+) reaction at 1.2 GeV/c within a distorted-wave impulse approximation with the optimal Fermi-averaging π−p → K+Σ− t matrix. We attempt to clarify the property of a Σ-nucleus potential for Σ−-5He by comparing the calculated spectra with the data of the J-PARC E10 experiment. The result shows that the repulsive and absorptive components of the Σ−-5He potential provide the ability to explain the data of the continuum spectra in Σ and Λ regions; the strengths of VΣ ≃ +30 MeV and WΣ ≃ −26 MeV are favored within the Woods-Saxon potential, consistent with analyses for heavier nuclei. Effects of the size and potential range for Σ−-5He in the neutron excess of (N − Z)/(N + Z) = 0.2 are also discussed.
|Publication status||Published - 2017 Dec 7|
- Sigma-nucleus potential
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