Nonmesonic Weak Decay of Light Hypernuclei with Coherent Σ Mixing

Chiral Symmetry and Weak Decay of Hypernuclei

The weak decays of hyperons and hypernuclei are studied from the chiral symmetry viewpoint. The soft pion relations are useful in understanding the isospin properties of the weak hyperon decays. Recent development on the short-range part of the ΛN → NN weak transitions shows fairly good account of the weak decays of hypernuclei, though it fails to explain the n/p ratio. The π decays of light hy...

Nonmesonic Weak Decay of Λ Hypernuclei within a Nuclear Matter Formalism

The nonmesonic weak decay of Λ hypernuclei using nonrelativistic nuclear matter is studied. As the basic building block we use the Polarization Propagator Method developed by Oset and Salcedo. It is shown that the exact calculation of exchange terms is required. Using the Local Density Approximation we evaluate the nonmesonic decay width for 12 Λ C and compare the result with a finite nucleus c...

Recent results on the nonmesonic weak decay of hypernuclei within a one - meson - exchange model

Recent results on the nonmesonic weak decay of hypernuclei within a one-meson-exchange model. Abstract We update [1] the results presented in Ref. [2] for the nonmesonic decay (NMD) of 12 Λ C and 5 Λ He. We pay special attention to the role played by Final State Intreractions (FSI) on the decay observables. We follow a One-Meson-Exchange (OME) model which includes the exchange of the π, ρ, K, K...

Role of deformation in the nonmesonic decay of light hypernuclei

We discuss the nonmesonic decay of deformed p-shell hypernuclei. The Nilsson model with angular momentum projection is employed in order to take into account the deformation effects. The nonmesonic decay rate decreases as a function of the deformation parameter, while the ratio of the neutronto proton-induced decay rates and the intrinsic Λ asymmetry parameter increase. We find that the deforma...

The Nonmesonic Weak Decay of Hypernuclei