The FINUDA experiment has recently completed an extensive study of the weak decay of p-shell Λ- hypernuclei including both mesonic and non-mesonic modes. Charged mesonic decay rates have been determined based on the analysis of π − 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 ΛNN →nNN decay channel: its weight has been evaluated to be Γ2/ΓNM = 0.21±0.07stat +0.03 sys −0.02 sys. Finally, a direct experimental evidence of the occurrence of the weak reaction Λnp →nnp in nuclei is presented for the first time. Three events have been found which can be attributed to 7 ΛLi and 9 ΛBe two-nucleon induced non-mesonic weak decay; the kinematical analysis is discussed here.
Hypernuclear weak decay studies with FINUDA / M., Agnello; L., Benussi; M., Bertani; H. C., Bhang; G., Bonomi; E., Botta; Bregant, Marco; T., Bressani; S., Bufalino; L., Busso; D., Calvo; Camerini, Paolo; B., Dalena; F., De Mori; G., D’Erasmo; F. L., Fabbri; A., Feliciello; A., Filippi; E. M., Fiore; H., Fujioka; P., Gianotti; N., Grion; V., Lucherini; S., Marcello; N., Mirfakhrai; F., Moia; P., Montagna; O., Morra; T., Nagae; H., Outa; A., Pantaleo; V., Paticchio; Piano, Stefano; Rui, Rinaldo; G., Simonetti; R., Wheadon; A., Zenoni. - 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
BREGANT, MARCO;CAMERINI, Paolo;PIANO, STEFANO;RUI, RINALDO;
2012-01-01
Abstract
The FINUDA experiment has recently completed an extensive study of the weak decay of p-shell Λ- hypernuclei including both mesonic and non-mesonic modes. Charged mesonic decay rates have been determined based on the analysis of π − 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 ΛNN →nNN decay channel: its weight has been evaluated to be Γ2/ΓNM = 0.21±0.07stat +0.03 sys −0.02 sys. Finally, a direct experimental evidence of the occurrence of the weak reaction Λnp →nnp in nuclei is presented for the first time. Three events have been found which can be attributed to 7 ΛLi and 9 ΛBe two-nucleon induced non-mesonic weak decay; the kinematical analysis is discussed here.Pubblicazioni consigliate
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