Archivio Istituzionale della RicercaThe decay of Lambda-hypernuclei without pi emission, known as Non-Mesonic Weak Decay (NMWD), gives an effective tool to investigate Delta S = 1 four-baryon interactions. It was theoretically suggested that the two-nucleon induced mechanism could play a substantial role in reproducing the observed NMWD decay rates and nucleon spectra, but at present no direct evidence of such a mechanism has been obtained. The FINUDA experiment, exploiting the possibility to detect both charged and neutral particles coming from the hypernucleus decay, has allowed us to deduce the relative weight of the two nucleon induced decay rate to the total NMWD rate. The value of Gamma(2N)/ Gamma(NMWD) = 0.21 +/- 0.07stat (+0.03sys)(-0.02sys) has been deduced, well consistent with the previous determinations. (C) 2011 Elsevier B.V. All rights reserved.
Neutron-proton coincidences from Non-Mesonic Weak Decay of p-shell Lambda-hypernuclei and determination of the two-nucleon induced process / 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.; Genova, P.; 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.; Garbarino, G.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 701:5(2011), pp. 556-561. [10.1016/j.physletb.2011.06.035]
Neutron-proton coincidences from Non-Mesonic Weak Decay of p-shell Lambda-hypernuclei and determination of the two-nucleon induced process
AGNELLO, MICHELANGELO;BUFALINO, STEFANIA;
2011
Abstract
The decay of Lambda-hypernuclei without pi emission, known as Non-Mesonic Weak Decay (NMWD), gives an effective tool to investigate Delta S = 1 four-baryon interactions. It was theoretically suggested that the two-nucleon induced mechanism could play a substantial role in reproducing the observed NMWD decay rates and nucleon spectra, but at present no direct evidence of such a mechanism has been obtained. The FINUDA experiment, exploiting the possibility to detect both charged and neutral particles coming from the hypernucleus decay, has allowed us to deduce the relative weight of the two nucleon induced decay rate to the total NMWD rate. The value of Gamma(2N)/ Gamma(NMWD) = 0.21 +/- 0.07stat (+0.03sys)(-0.02sys) has been deduced, well consistent with the previous determinations. (C) 2011 Elsevier B.V. All rights reserved.
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https://hdl.handle.net/11583/2496865
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