Elsevier

Nuclear Physics A

Volume 341, Issue 3, 9 June 1980, Pages 421-439
Nuclear Physics A

Experimental study of excitation functions and isomer ratios for 211, 212Po

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Abstract

Excitation functions have been measured for ground states and isomers populated in the 208Pb(α, n)211Po, 209Bi(α, np)211Po, 209Bi(α, p)212Po and 209Bi(α, n)212At reactions for α-beams ranging from 45 MeV to 172.5 MeV. The experimental results have been compared with theoretical calculations assuming direct and preequilibrium reaction mechanisms, respectively. It is found that the experimental excitation functions can be reproduced satisfactorily by calculations in the framework of the preequilibrium model. Isomer ratios have been extracted from the data as well. Their energy dependence can be reproduced by an optical-model calculation for beam energies larger than about 60 MeV.

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    On leave of absence at the Niels Bohr Institute, Tandem Accelerator Laboratory Risø, DK-4000 Roskilde, Denmark.

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