Abstract
The nuclear charge-symmetry-breaking forces due to the ϱ 0− ω and π 0− η mixings are evaluated in the isovector mass shifts of isospin multiplets and the isospin-mixing matrix elements relevant to the isospin-forbidden beta decays, in the 1s0d-shell nuclei. We find that the calculated mass shifts represent the state dependence of experimental ones, and find a large contribution of the meson-mixing in the isospin-mixing matrix elements.
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