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 7ΛLi and 9ΛBe two-nucleon induced non-mesonic weak decay; the kinematical analysis is discussed here.

Hypernuclear weak decay studies with FINUDA

MONTAGNA, PAOLO MARIA;
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 7ΛLi and 9ΛBe 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/11571/575188
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