An improved determination of the two--nucleon induced non mesonic weak decay of $Λ$-hypernuclei

Details An improved determination of the two--nucleon induced non mesonic weak decay of $Λ$-hypernuclei An improved determination of the two--nucleon induced non mesonic weak decay of $Λ$-hypernuclei

2011-01-24

arxiv.org/abs/1101.4481v1

Physics

Nuclear Physics

Nuclear Experiment

10 pages, 3 figures

Scientific paper

The decay of $\Lambda$-hypernuclei without pion 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 $\Gamma_{2N}$/$\Gamma_{NMWD}$=0.24$\pm$${0.03_{stat}}^{+0.03_{sys}}_{{-{0.02_{sys}}}}$ has been deduced, with an error reduced by a factor more than two compared with the previous assessment.

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