This Letter is concerned with the study of the K− stop A→π± Σ ∓ A reaction in p-shell nuclei, i.e., 6,7Li, 9Be, 13C and 16O. The π± Σ ∓ /K− stop emission rates are reported as a function of A. These rates are discussed in comparison with previous findings. The ratio π− Σ + /π+ Σ − in p-shell nuclei is found to depart largely from that on hydrogen, which provides support for large in-medium effects possibly generated by the sub-threshold Λ(1405). The continuum momentum spectra of prompt pions and free sigmas are also discussed as well as the π± Σ ∓ missing mass behavior and the link with the reaction mechanism. The apparatus used for the investigation is the FINUDA spectrometer operating at the DANE φ-factory (LNFINFN, Italy).
The A(K−stop,π±Σ∓)A reaction on p-shell nuclei
BREGANT, MARCO;CAMERINI, Paolo;PIANO, STEFANO;RUI, RINALDO;
2011-01-01
Abstract
This Letter is concerned with the study of the K− stop A→π± Σ ∓ A reaction in p-shell nuclei, i.e., 6,7Li, 9Be, 13C and 16O. The π± Σ ∓ /K− stop emission rates are reported as a function of A. These rates are discussed in comparison with previous findings. The ratio π− Σ + /π+ Σ − in p-shell nuclei is found to depart largely from that on hydrogen, which provides support for large in-medium effects possibly generated by the sub-threshold Λ(1405). The continuum momentum spectra of prompt pions and free sigmas are also discussed as well as the π± Σ ∓ missing mass behavior and the link with the reaction mechanism. The apparatus used for the investigation is the FINUDA spectrometer operating at the DANE φ-factory (LNFINFN, Italy).Pubblicazioni consigliate
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