Abstract
Performing Hartree-Fock plus RPA (TDA) calculations, it is shown that “super-allowed” Gamow-Teller (GT) beta-decays are possible for light neutron-drip-line without calling for the phenomena related to a neutron halo. The calculated result is in agreement with the feature of the observed GT strength in 8He, if we use the effective GT operator, which is 60% of the free operator. The result calculated by using a schematic model with simple separable interactions is also presented, in order to illustrate a general view.
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