Decays of Λ in nuclei, nonmesonic mode, are studied by using the ΛN → NN weak transition potential derived from the meson exchange mechanism and the direct quark mechanism. The decay rates are calculated both for the Λ in symmetric nuclear matter and light hypernuclei. We consider the exchange of six mesons (π,K, η, ρ, ω,K). The form factor in the meson exchange mechanism and short range correl...

We consider two hypothesis testing problems with N independent observations on a single m-vector, when m > N , and the N observations on the random m-vector are independently and identically distributed as multivariate normal with mean vector μ and covariance matrix Σ, both unknown. In the first problem, the m-vector is partitioned into two subvectors of dimensions m1 and m2, respectively, and ...

Violent events are main causes of mortality among children and include intentional (e.g., homicide) and unintentional (e.g., accidents) circumstances. This study investigated the prediction of the self-reported occurrence of 14 violent events among eighth-grade youth from psychosocial variables measured in these same youth in seventh grade. Psychosocial variables inV iolent events include both ...