Mass--dependence of the Lambda hypernuclear decay widths


Two different approaches have been employed for the evaluation of the decay widths of Lambda-hypernuclei (ranging from Λ5^5_{\Lambda}He to Λ208^{208}_{\Lambda}Pb) with the polarization propagator method. In ref.[1], the two-nucleon stimulated non-mesonic decay, ΛNN→NNN\Lambda NN\to NNN, has been parameterized phenomenologically by means of data on the pion-nucleus optical potential. The other approach [2] consisted in a fully microscopic description of the non-mesonic decays through the first order approximation of the so-called bosonic-loop-expansion. Both calculations reproduce, with approximately the same accuracy, the experimental decay rates for the whole range of mass numbers considered.Comment: 4 pages, 2 figures. Talk presented at HYP2000, Torino, 23-27 Oct. 2000. To appear in the proceedings (Nucl. Phys. A

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