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Separated isotopes of bromine and rhenium have been studied by means of Coulomb excitation with 2to 4.2-Mev protons and alpha particles. Gamma rays were observed with a Nal crystal spectrometer at the following energies: Br 79 , 219 kev; Br 81 , 278 kev; Re 185 , 126, 160, and 286 kev; Re 187 , 135, 168, and 303 kev. Probable level schemes are given which are based on coincidence measurements and, in some cases, on excitation curves. The results from data on Ta 181 taken in the course of this study are also included. The reduced transition probabilities for excitation of all relevant nuclear levels have been measured. In the case of Ta and the Re isotopes the cascade to crossover intensity ratio in the decay of the second excited state has also been measured.

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The angular distributions of the a-particle groups from the C 13 (He 3 ,ot)C 12 reaction which leave the C 12 nuclei in the ground and first excited states have been measured at a bombarding energy of 4.5 Mev. The angular distributions have been fitted with Legendre polynomial expansions. In order to fit the data within the experimental uncertainties it was necessary to include polynomials up to the eighth degree in these expansions. It appears unlikely that the angular distributions can be accounted for on the basis of compound-nucleus type of reaction. Although the usual concept of a pickup type reaction also encounters difficulties in attempting to account for this reaction, theoretical calculations based on this type of process have been compared with the experimental results. Other possible mechanisms by which this reaction may take place are suggested.

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