THE SCATTERING OF PROTONS ON 7Li, 9Be, AND 12C AT 100 MEV

Elastic and inelastic scattering of protons on 7Li, 9Be, and 12C have been studied, using the 100-MeV proton beam from the McGill synchrocyclotron. Differential cross sections for the various groups of scattered protons were measured over an angular range of 5° to 90° (lab). For proton groups resulting from a quadrupole excitation in the target nucleus, the angular distribution was found to increase at scattering angles less than 10°. Angular distributions corresponding to an octupole excitation were observed to decrease at small angles. The results have been compared with existing data in this energy region.

Electrical octupole Coulomb excitation in rhodium

The electric octupole excitation of the 40 keV isomeric state in 103 Rh has been observed with protons of energies 700 to 1200 keV. The energy dependence of the cross-section is consistent with that predicted by the W. K. B. treatment of Alder & Winther. The absolute cross-section is about three times that expected theoretically. Possible explanations for this discrepancy are suggested.