Abstract
We investigate β decays of the neutron-rich nucleus 18N and thestructure of the daughter nucleus 18O using the shellmodel. The reduced transition strengths B(GT) and branchingratios of the β decays in 18N are calculated in the psd and spsdpf shell spaces with the WBT interaction. Thecalculations in the two different spaces are compared. The psdcalculations obtain a better agreement with the observation of the β-delayed neutron emission, which seems to show that theobserved properties of 18N and 18O are mainly produced byone particle being excited from the p-shell to the sd-shell.
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