The A(Kstop−,π±Σ∓)A′ reaction on p-shell nuclei
- Agnello, M.
- Benussi, L.
- Bertani, M.
- Bhang, H.C.
- Bonomi, G.
- Botta, E.
- Bregant, M.
- Bressani, T.
- Bufalino, S.
- Busso, L.
- Calvo, D.
- Camerini, P.
- Dalena, B.
- De Mori, F.
- DʼErasmo, G.
- Fabbri, F.L.
- Feliciello, A.
- Filippi, A.
- Fiore, E.M.
- Fontana, A.
- Fujioka, H.
- Genova, P.
- Gianotti, P.
- Grion, N.
- Lucherini, V.
- Marcello, S.
- Mirfakhrai, N.
- Moia, F.
- Montagna, P.
- Morra, O.
- Nagae, T.
- Outa, H.
- Pantaleo, A.
- Paticchio, V.
- Piano, S.
- Rui, R.
- Simonetti, G.
- Wheadon, R.
- Zenoni, A.
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DOIAbstract
AbstractThis Letter is concerned with the study of the Kstop−A→π±Σ∓A′ reaction in p-shell nuclei, i.e., 6,7Li, 9Be, 13C and 16O. The π±Σ∓/Kstop− 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 DAΦNE ϕ-factory (LNF-INFN, Italy)