Abstract
By the use of accelerated ions, the reaction has been studied in the energy range 100-800 kev ( energy). The angular distribution of the protons was found to be isotropic at bombarding energies of 200, 290, and 350 kev. The reaction cross section has a peak of 695±14 millibarns as determined with reference to the peak value 5.00 barns for the comparison reaction, . The comparison was effected by alternately bombarding the same deuterium target with tritium and ions, and counting the alpha particles. The peak occurred at 640-kev ion bombarding energy.
From considerations of the absolute value of the cross section, it is concluded that the resonance at 640 kev is associated with a level in the compound nucleus. The experimental shape of the peak is well fitted by resonance parameters in the one-level dispersion formula having the following values: interaction radius , 5× cm; reduced width for proton emission , 41.9 kev; reduced scattering width , 2930 kev; "formal" resonance energy in the center-of-mass system , 391 kev; energy of the level above the ground state of : 16.2±0.3 Mev. These values agree within experimental error with analogous values associated with the similar resonance which occurs in the reaction.
- Received 29 September 1954
DOI:https://doi.org/10.1103/PhysRev.97.456
©1955 American Physical Society