He$sup 3$-ALPHA SCATTERING

Differential cross sections for scattering of He/sup 4/ by He/sup 3/ are measured at E alpha = 27.7, 28.5. 29.4. 30.0, 32.0, 33-4, spectrometer, at center of mass angles from approximately 30 to approximately 150 deg . Three distinct minima are found, at about 45. 100, and 140 deg . The absolute cross section and the pattern of the angular distribution show no appreciable change in the energy range investigated: there is thus no sharp resonance in the He/sup 3/ + He/sup 4/ system corresponding to an excited state of Be/sup 7/ between 13.4 and 19.2 Mev. Differential cross sections of the protons from He/sup 3/( alpha ,p)Li/sup 6/ Li/sup 6*/ are observed. Differential cross sections of alpha-alpha scattering are also measured at E alpha = 33.5 and 35.5 Mev. (auth)