Nonmesonic weak decay of light hypernuclei with coherent $Σ$ mixing

Details Nonmesonic weak decay of light hypernuclei with coherent $Σ$ mixing Nonmesonic weak decay of light hypernuclei with coherent $Σ$ mixing

2002-04-24

arxiv.org/abs/nucl-th/0204057v1

Nucl.Phys. A707 (2002) 477-490

Physics

Nuclear Physics

Nuclear Theory

17 pages, 2 figures

Scientific paper

10.1016/S0375-9474(02)01006-0

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 $\pi$ and $K$ meson exchange processes. Virtual $\Sigma$ mixings of the coherent type are found to give significant effects on the decay rates of $^4_{\Lambda}{\rm He}$. A large violation of the $\Delta I = 1/2$ rule is predicted in the J=0 transition amplitudes.

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