Effect of breathing excitations of the triton nucleus on the αt cluster structure of ⁷Li

The effect of breathing excitations of the triton nucleus on the αt cluster structure is studied by investigating electromagnetic properties of ⁷Li in terms of a microscopic αt cluster model. An admixture of the triton breathing states makes no remarkable change in the surface clustering of the bound spin-doublet states of ⁷Li. As far as practical problems, e.g. the radiative capture process with low momentum transfer and the αt scattering problem, are concerned, a standard resonating group wave function, without taking into account the breathing excitations of the triton, gives a substantially good approximation provided that the stability conditions are satisfied for both the constituent nuclei α and t.