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 neu- tron, has triggered the investigation of the two-nucleon induced ΛN N → nN N decay channel: its weight has been evaluated to be Γ2 /ΓN M = 0.21 ± 0.07stat +0.03 sys . Finally, a direct experimental evidence of the −0.02 sys 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

BOTTA, Elena;BRESSANI, Tullio;BUSSO, Luigi;DE MORI, FRANCESCA;MARCELLO, Simonetta;
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 neu- tron, has triggered the investigation of the two-nucleon induced ΛN N → nN N decay channel: its weight has been evaluated to be Γ2 /ΓN M = 0.21 ± 0.07stat +0.03 sys . Finally, a direct experimental evidence of the −0.02 sys 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.
2012
881
322
338
hypernuclei, weak decay, mesonic decay
M. Agnello;L. Benussi;M. Bertani;H.C. Bhang;G. Bonomi;E. Botta;M. Bregant;T. Bressani;S. Bufalino;L. Busso;D. Calvo;P. Camerini;B. Dalena;F. De Mori;G. DʼErasmo;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;S. Piano;R. Rui;G. Simonetti;R. Wheadon;A. Zenoni
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/109287
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