IFLP 13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
A Theoretical Determination of N_{nn}/N_{np} in Hypernuclear Non--Mesonic Weak Decay
Autor/es:
E. BAUER, G. GARBARINO
Revista:
NUCLEAR PHYSICS A
Editorial:
Elsevier
Referencias:
Año: 2010 p. 430 - 433
ISSN:
0375-9474
Resumen:
The ratio $N_{nn}/N_{np}$ between the number of neutron--neutronand neutron--proton pairs emittedin the non--mesonic weak decay of $Lambda$--hypernuclei iscalculated within a nuclear matter formalism extended to$^{12}_{Lambda}$C via the local densityapproximation. The single--nucleon emission spectra, $N_p$ and $N_n$, arealso evaluated. Our formalism takes care of bothground state correlations (gsc) and final state interactions (FSI).The evaluation of $N_{nn}/N_{np}$---~which, unlike $Gamma_n/Gamma_pequivGamma(Lambda n o nn)/Gamma(Lambda p o np)$, is anactual observable quantity in non--mesonic decay~--- is performedwithin a fully microscopic model where a propertreatment of FSI, gsc and ground state normalization isconsidered. All the isospin channels contributingto one-- and two--nucleon induced decays are included.Our final result for the coincidence number ratio,$N_{nn}/N_{np}=0.374$, is in agreement withthe KEK--E508 datum, $(N_{nn}/N_{np})^{ m exp}=0.40pm 0.10$.
