Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5495055 | Physics Letters B | 2017 | 5 Pages |
Abstract
The nonmesonic weak decay of Î hypernuclei is studied within a microscopic diagrammatic approach which is extended to include the three-nucleon induced mechanism. We adopt a nuclear matter formalism which, through the local density approximation, allows us to model finite hypernuclei, a one-meson-exchange weak transition potential and a Bonn nucleon-nucleon strong potential. One-, two- and three-nucleon induced weak decay rates are predicted for CÎ12 by including ground state correlations up to second order in the nucleon-nucleon potential and the recoil of the residual nucleus. Three-nucleon stimulated decays, ÎNNNânNNN (N=n or p), are considered here for the first time. The obtained decay rates compare well with the latest KEK and FINUDA data. The three-nucleon induced rate turns out to be dominated by nnp- and npp-induced decays, it amounts to â¼7% of the total nonmesonic rate and it is â¼1/2 of the neutron-induced decay rate. The reduction effect of the nuclear recoil is particularly relevant for the three-nucleon induced rates (â¼15%), less important for the two-nucleon induced rates (â¼4%) and negligible for the one-nucleon induced rates. Given the non-negligible size of the three-nucleon induced contribution and consequently its importance in the precise determination of the complete set of decay rates, new measurements and/or experimental analysis are encouraged.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
E. Bauer, G. Garbarino, C.A. RodrÃguez Peña,