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Angular distributions of the elastic scattering of 28 Si on 29 Si and 30 Si have been measured for incident beam energies at E = 65 and 70 MeV with a time-of-flight spectrometer for heavy ions. At 70 MeV the neutron transfer 30 Si( 28 Si, 29 Si) 29 Si was observed in addition to the elastic channel. The pronounced oscillations in the elastic scattering distributions are interpreted as being due to an elastic transfer of neutrons between the colliding nuclei during the scattering process. This assumption is in accordance with some general features of the data and allows for the extraction of spectroscopic factors of the transferred neutrons.

The elastic scattering of 12 C on 13 C has been measured between c.m. energies of 4.8 and 9.5 MeV in steps of 48 keV at θ c.m. = 90°. The absence of resonance-like structures comparable to those observed in 12 C- 12 C scattering is discussed with respect to the influence of the elastic neutron transfer. The presence of this transfer even below the barrier is demonstrated by the measurement of an angular distribution of the 12 C- 13 C scattering at E c.m. = 5.76 MeV.