Abstract
Thin targets of and were bombarded with ions from the Oak Ridge tandem van de Graaff accelerator. Ranges, angular distributions , and total cross sections were obtained by measuring the activities of the positron emitters and formed in the neutron and proton transfer reactions. The (,) reaction was shown to involve primarily ground states of at an incident energy of 16.3 MeV. The angular-distribution data for this reaction were found, in their dependence on angle, to be consistent with tunneling-theory calculations. [Although cross-section calculations with the tunneling theory have been limited to the (,) reaction, the angular dependence calculated for the differential cross section can be used for other reactions.] A reduced width for the transferred neutron could not be determined, however, because of the specialization of the calculations to the (,) reaction. In the (,) reaction, the protons transfer to both the ground state and first excited state of , but no transfers involving the first excited state of were observed. For the (,) experiments, reactions were found at the higher energies measured (>27.5 MeV) which led to excited states as well as to the ground state of . Again, the angular distributions were found to be consistent with the tunneling process. Total-cross-section data were also obtained which can be used for a neutron reduced-width determination in when the theory has been extended to this reaction (with the reservation that there is no evidence available that only one state in is involved in the transfer-process energies below 27.5 MeV).
- Received 29 July 1966
DOI:https://doi.org/10.1103/PhysRev.152.883
©1966 American Physical Society