Archivio Istituzionale della RicercaThe 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, 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., D'Erasmo, G., Fabbri, F.L., Feliciello, A., Filippi, A., Fiore, E.M., Fujioka, H., et al.. - 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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https://hdl.handle.net/11583/2497936
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