Abstract
We investigate a striking example of mirror asymmetry in Gamow-Teller (GT) β-decay using the nuclear shell-model including isospin-nonconserving (INC) forces in the sd-shell region. We show that the large mirror asymmetry between 26P and 26Na GT β-decay can be accurately reproduced by introducing T=1, J≠0 INC forces related to the s1/2 orbit, while the usual J=0 INC force, commonly adopted to describe isospin-symmetry breaking, does not work. We further show that the calculated distribution of summed GT strength for the 26P β-decay is in good agreement with the experimental data. Our results support the conclusion that 26P is a nucleus with proton-halo structure.
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