CLUSTER MODEL INTERPRETATION OF THE ISOTOPIC SPIN SELECTION RULE IN CERTAIN NUCLEAR REACTIONS

The reactions Li/sup 6/(Li/sup 6/,d)B/sup 10/and Li/sup 6/(Li/sup 7/,t)B/ sup 10/ w ere studied at 2.1 and 2.2 Mev incident energy with particular reference to the T = l, second excited state of B/sup 10/ at 1.74 Mev. The deuteron and triton spectra for these reactions at a laboratory angle of 9.5 and l4.5 deg , respectively, show very low numbers of deuterons and tritons leading to the T = 1 level in B/sup 10/, whereas the isotopic spin selection rule precludes formation of the T = 1 level only in the Li/sup 6/(Li/sup 6/,d) reaction. The reactions are explained by means of a stripping mechanism with capture of the alpha particle substructure in place of the isotopic selection rule. (D.L.C.)