Momenta spectra of protons emitted following the capture of K- in Li-6 and C-12 have been measured with 1% resolution. The C-12 spectrum is smooth whereas for Li-6 a well defined peak appears at about 500 MeV/c. The first observation of a structure in this region was identified as a strange tribaryon or, possibly, a K-nuclear state. The peak is correlated with a pi(-) coming from Sigma(-) decay in flight, selected by setting the pi momentum larger than 275 MeV/c. The Sigma(-) could be produced, together with a 500 MeV/c proton, by the capture of a K- in a deuteron-cluster substructure of the Li-6 nucleus. The capture rate for such a reaction is (1.62 +/- 0.23stat(-0.44)(+0.71)(sys))%/K-stop(-), in agreement with the existing observations on stop, targets and with the hypothesis that the Li-6 nucleus can be interpreted as a (d + alpha) cluster.

A study of the proton spectra following the capture of K- in 6Li and 12C with FINUDA

BOTTA, Elena;BRESSANI, Tullio;BUSSO, Luigi;DE MORI, FRANCESCA;FASO, Diego;MARCELLO, Simonetta;
2006

Abstract

Momenta spectra of protons emitted following the capture of K- in Li-6 and C-12 have been measured with 1% resolution. The C-12 spectrum is smooth whereas for Li-6 a well defined peak appears at about 500 MeV/c. The first observation of a structure in this region was identified as a strange tribaryon or, possibly, a K-nuclear state. The peak is correlated with a pi(-) coming from Sigma(-) decay in flight, selected by setting the pi momentum larger than 275 MeV/c. The Sigma(-) could be produced, together with a 500 MeV/c proton, by the capture of a K- in a deuteron-cluster substructure of the Li-6 nucleus. The capture rate for such a reaction is (1.62 +/- 0.23stat(-0.44)(+0.71)(sys))%/K-stop(-), in agreement with the existing observations on stop, targets and with the hypothesis that the Li-6 nucleus can be interpreted as a (d + alpha) cluster.
A775
35
50
Agnello, M; Beer, G; Benussi, L; Bertani, M; Bhang, Hc; Bianco, S; Bonomi, G; Botta, Elena; Bregant, M; Bressani, Tullio; Bufalino, S; Busso, Luigi; Calvo, D; Camerini, P; Cerello, P; Dalena, B; DE MORI, Francesca; D'Erasmo, G; DI SANTO, D; Elia, D; Fabbri, Fl; Faso, Diego; Feliciello, A; Filippi, A; Filippini, V; Fini, Ra; Fiore, Em; Fujioka, H; Gianotti, P; Grion, N; Hartmann, O; Krasnoperov, A; Lenti, V; Lucherini, V; Manzari, V; Marcello, Simonetta; Maruta, T; Mirfakhrai, N; Morra, O; Nagae, T; Olin, A; Outa, H; Pace, E; Pallotta, M; Palomba, M; Pantaleo, A; Panzarasa, A; Paticchio, V; Piano, S; Pompili, F; Rui, R; Simonetti, G; So, H; Tereshchenko, V; Tomassini, S; Toyoda, A; Wheadon, R; Zenoni, A.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/24921
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