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.