Abstract
Recoil ranges projected along the beam direction have been measured for the ( alpha , alpha gamma ), ( alpha , alpha n), ( alpha ,pn), and (p,p gamma ) reactions on In/sup 115/ and for the In/sup 113/(p,n) reaction, with 5 to 10 Mev protons and 20 to 40 Mev alpha particles. The results have been compared with values expected for compoundnucleus formation and reasonable agreement is obtained for the ( alpha ,pn), (p,p gamma ), and (p,n) reactions. The measured range for the ( alpha , alpha n) reaction agrees with calculation at the lowest energy studied but is somewhat low at the highest bombarding energy. In the case of the ( alpha , alpha gamma ) reaction the measured ranges are a factor of 3 to 6 smaller than the calculated values, indicating a direct interaction process. The recoil ranges expected for Coulomb excitation have been computed for the ( alpha , alpha gamma ) and (p,p gamma ) reactions and are substantially smaller than the experimental values. Excitation function measurements for the ( alpha ,pn) reaction are also presented. (auth)
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