Nuclear structure in nonmesonic weak decay of hypernuclei

The Nonmesonic Weak Decay of Hypernuclei

Nonmesonic Weak Decay of Light Hypernuclei with Coherent Σ Mixing

Nonmesonic weak decays of the A = 4, and 5 hypernuclei are studied. The short range parts of the hyperon-nucleon weak interactions are described by the direct quark (DQ) weak transition potential, while the longer range interactions are given by the π and K meson exchange processes. Virtual Σ mixings of the coherent type are found to give significant effects on the decay rates of 4ΛHe. A large ...

Asymmetries in the Nonmesonic Weak Decay of Polarized Hypernuclei

0031-9007= The nonmesonic weak decay of polarized hypernuclei is studied for the first time by taking into account, with a Monte Carlo intranuclear cascade code, the nucleon final state interactions. A one-mesonexchange model is employed to describe the ~ N ! nN processes in a finite nucleus framework. The relationship between the intrinsic asymmetry parameter a and the asymmetry aM accessible ...

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...

Weak decay of hypernuclei

The nonmesonic weak decay of L hypernuclei is studied in a shell model framework. A complete strangeness-changing weak LN→NN transition potential, based on one boson exchange, is constructed by including the exchange of the pseudoscalar mesons p , K , h as well as the vector mesons r ,v , and K*, whose weak-coupling constants are obtained from soft meson theorems and SU~6!w . General expression...