2009/12/18 by Francesco Conti, Conti, Francesco, Andrea Meucci +3
Engineering · Physics and Astronomy · #Particle Accelerators and Free-Electron Lasers #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.48550/arxiv.0912.3630
25 pages, 9 figures, new results, new figures
arxiv created 2011/01/20 · arxiv updated 2015/03/13
A fully relativistic finite nucleus wave-function approach to the non-mesonic weak decay of the Λ12 C hypernucleus is presented. The model is based on the calculation of the amplitudes of the tree-level Feynman diagrams for the ΛN→ NN process and includes one-pion exchange and one-kaon exchange diagrams. The pseudo-scalar and pseudo-vector choices for the vertex structure are compared. Final-state interactions between each one of the outgoing nucleons and the residual nucleus are accounted for by a complex phenomenological optical potential. Initial ΛN and final NN short-range correlations are included by means of phenomenological correlation functions. Numerical results are presented and discussed for the total non-mesonic decay width Γnm=Γn+Γp, the Γn/Γp ratio, the aΛ intrinsic asymmetry parameter, and the kinetic energy and angular spectra.