The FINUDA experiment has recently completed an extensive study of the weak decay of p-shell Lambda-hypernuclei including both mesonic and non-mesonic modes. Charged mesonic decay rates have been determined based on the analysis of pi(-) kinetic energy spectra, never measured before. The study of proton spectra from non-mesonic weak decay for p-shell hypernuclei, both single and in coincidence with a neutron, has triggered the investigation of the two-nucleon induced Lambda NN --> nNN decay channel: its weight has been evaluated to be Gamma(2)/Gamma(NM) = 0.21 +/- 0.07(stat-0.02sys)(+0.03sys). Finally, a direct experimental evidence of the occurrence of the weak reaction Lambda np --> nnp in nuclei is presented for the first time. Three events have been found which can be attributed to Li-7(Lambda) and Be-9(Lambda) two-nucleon induced non-mesonic weak decay; the kinematical analysis is discussed here.

Hypernuclear weak decay studies with FINUDA / Agnello, Michelangelo; Benussi, L.; Bertani, M.; Bhang, H. C.; Bonomi, G.; Botta, E.; Bregant, M.; Bressani, T.; Bufalino, Stefania; Busso, L.; Calvo, D.; Camerini, P.; Dalena, B.; De Mori, F.; D'Erasmo, G.; Fabbri, F. L.; Feliciello, A.; Filippi, A.; Fiore, E. M.; Fujioka, H.; Gianotti, P.; Grion, N.; Lucherini, V.; Marcello, S.; Mirfakhrai, N.; Moia, F.; Montagna, R.; Morra, O.; Nagae, T.; Outa, H.; Pantaleo, A.; Paticchio, V.; Piano, S.; Rui, R.; Simonetti, G.; Wheadon, R.; Zenoni, A.. - In: NUCLEAR PHYSICS. A. - ISSN 0375-9474. - STAMPA. - 881:(2012), pp. 322-338. [10.1016/j.nuclphysa.2012.01.024]

Hypernuclear weak decay studies with FINUDA

AGNELLO, MICHELANGELO;BUFALINO, STEFANIA;
2012

Abstract

The FINUDA experiment has recently completed an extensive study of the weak decay of p-shell Lambda-hypernuclei including both mesonic and non-mesonic modes. Charged mesonic decay rates have been determined based on the analysis of pi(-) kinetic energy spectra, never measured before. The study of proton spectra from non-mesonic weak decay for p-shell hypernuclei, both single and in coincidence with a neutron, has triggered the investigation of the two-nucleon induced Lambda NN --> nNN decay channel: its weight has been evaluated to be Gamma(2)/Gamma(NM) = 0.21 +/- 0.07(stat-0.02sys)(+0.03sys). Finally, a direct experimental evidence of the occurrence of the weak reaction Lambda np --> nnp in nuclei is presented for the first time. Three events have been found which can be attributed to Li-7(Lambda) and Be-9(Lambda) two-nucleon induced non-mesonic weak decay; the kinematical analysis is discussed here.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2497936
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