The formation and decay of the compound mucleur Ge 68.

Experimental excitation functions have been measured by radiochemical means for a number of reactions proceeding through the compound nucleus Ge . The target- li 54 TO ^f, 16 52 projectile pairs were: He +Zn , C +Fe , and 0 +Cr leading to the following reactions: (OO,Y), (x,p), (x,n), (x,pn), and (x,2n). Recoil ranges were measured for products of the alpha-induced reactions in order to determine those reactions which proceeded by compound nucleus formation and decay. It has been found that the "independence hypothesis" is verified for reactions induced by different target-projectile pairs but proceeding through compound nuclei of nearly equal angular momentum. Excitation functions have been calculated with the SFU IBM System. ^60/40 computer via the statistical theory of nuclear reactions according to a formalism containing the explicit dependence of nuclear emission probabilities on angular momentum. Probabilities for Y-ray emission were calculated according to the single-particle model coupled with enhancement functions chosen to reflect experimentally observed collective effects. Agreement between experiment and calculations 64 4 was found to be good for the Zn +He excitation functions. The "high energy tails" of the excitation functions were found to be accounted for by effects of y-ray competition with particle emission when the latter was surpressed by angular momentum effects. Agreement in the Fe +C case was found to be very encouraging, considering the complexity of the target-projectile system and attendant theoretical difficulties.