Two nucleon induced hypernuclear weak decay within a nuclear matter

E. BAUER; F. KRMPOTIC

NUCLEAR PHYSICS A

Elsevier

Lugar: Amsterdam; Año: 2004 vol. 739 p. 109 - 123

0375-9474

The nonmesonic two-nucleon induced hypernuclear decay is studied using a nonrelativistic nuclear matter formalism, which is supplemented with the Local Density Approximation (LDA) to  evaluate the $^{12}_{\Lambda}C$ decay width. Three possible decay mechanisms: $\Gamma(\Lambda nn \rightarrow nnn)$, $\Gamma(\Lambda np \rightarrow nnp)$ and $\Gamma(\Lambda pp \rightarrow npp)$, are considered. The  full  One-Meson-Exchange Model (OMEM), which includes the complete pseudo-scalar and vector meson octets ($\pi,\eta,K,\rho,\omega,K^*$), is employed for the transition potential. The strong residual interaction, which  accounts for the ground state correlations, is modeled by a Bonn potential. Our results show that the two-nucleon induced decay is $\sim 24\%$ of the total nonmesonic decay width. We also confirm that this decay is dominated by the  process $\Lambda np \rightarrow nnp$, even though the two other decay channels  should not be neglected.