Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-08-22
Nucl.Phys.A633:312-330,1998
Physics
Nuclear Physics
Nuclear Theory
23 pages, 6 figures
Scientific paper
10.1016/S0375-9474(98)00005-0
Contributions of the direct quark mechanism are studied in the nonmesonic weak decays of light hypernuclei. The $\Lambda N \to NN$ transition is described by the one pion exchange mechanism and the direct quark mechanism, induced by the four-quark vertices in the effective weak Hamiltonian. By employing a realistic wave function of the $\Lambda$ inside the hypernuclei, nonmesonic decay rates of $^4_{\Lambda}$H, $^4_{\Lambda}$He, and $^5_{\Lambda}$He are calculated. The results show that the direct quark mechanism is significantly large and gives a large $\Delta I =3/2$ contribution in the J=0 channel. The relative phase between the one-pion exchange and the direct-quark contributions is determined so that the effective weak Hamiltonian for quarks give both of them consistently. We find that the sum of these two contributions reproduce the current available experimental data fairly well.
Inoue Tadao
Itonaga K.
Motoba Tetsuo
Oka Makoto
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