Nonmesonic Hyperon Weak Decay Spectra in $^{12}_Λ$C}

Details Nonmesonic Hyperon Weak Decay Spectra in $^{12}_Λ$C} Nonmesonic Hyperon Weak Decay Spectra in $^{12}_Λ$C}

2012-03-14

arxiv.org/abs/1203.3214v1

Journal of Physics: Conference Series {\bf 312} (2011) 022017

Physics

Nuclear Physics

Nuclear Theory

Proceedings of the International Nuclear Physics Conference 2010, Vancouver, BC - Canada 4-9 Jul 2010

Scientific paper

We study the nonmesonic weak decay (NMWD) $\Lambda N \to nN$ of the ${}^{12}_{\Lambda} C$ hypernucleus induced by the nucleon $N=n,p$ with transition rate $\Gamma_N$. The nuclear process is described by the interplay of two models; one describing the NMWD of hyperon $\Lambda$ in the nuclear environment, and the other taking into account the Final State Interaction (FSI) of the two outgoing nucleons with the residual nucleus. The first one is done in the framework of the Independent-Particle Shell-Model (IPSM), with the decay dynamics represented by the exchange of $\pi+ \eta+ K+\rho+\omega+K^*$ mesons with usual parametrization. For the second one is used a time dependent multicollisional intranuclear cascade schema (implemented in the CRISP code - Collaboration Rio-S\~ao Paulo). The results obtained for inclusive and exclusive kinetic energy spectra, and the angular correlation are compared with recent data from KEK and FINUDA experiments. The calculated ratio $(\Gamma_n / \Gamma_p)^{\partial{\tiny FSI}}$, between the numbers of emitted back-to-back $nn$ and $np$ pairs, is in good agreement with the experimental data.

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