IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Exchange terms in the two--nucleon induced non--mesonic
Autor/es:
E. BAUER, G. GARBARINO
Revista:
NUCLEAR PHYSICS A
Editorial:
Elsvier
Referencias:
Lugar: Amsterdam; Año: 2009 p. 29 - 51
ISSN:
0375-9474
Resumen:
The contribution of Pauli exchange terms to thetwo--nucleon induced non--mesonic weak decay of $^{12}_Lambda$Chypernuclei, $Lambda NN o nNN$ ($N=n$ or $p$),is studied within a nuclear matter formalism implementedin a local density approximation. We have adopteda weak transition potential including the exchange of the completeoctets of pseudoscalar and vector mesons as well as aresidual strong interaction modeled on the Bonn potential.{f Among the exchange contributions, only the dominantones have been evaluated microscopically from the correspondingGoldstone diagrams; a Landau--Migdal model has been adopted for theremaining exchange terms.}The introduction ofexchange terms turns out to reduce the two--nucleon induced non--mesonicrate by 18% and, jointly with an increase in the one--nucleon inducedrate by the same magnitude, reveals to be significant for an accuratedetermination of the full set of hypernuclear non--mesonic decay widthsin theoretical and experimental analyses.