Elastic and Inelastic Scattering of Alpha Particles by Carbon

Angular distributions of alpha particles scattered elastically and inelastically ( Q =-4.43 MeV) by carbon nucleus were measured with incident alpha energies of 28.4, 31.0 and 33.6 MeV. Angular distributions of inelastic alpha groups corresponding to Q =-7.66 and -9.63 MeV and a broad alpha group with Q ≃12.7 MeV were also obtained at E α =28.4 MeV. The data were compared with Blair's diffraction scattering model and fairly good agreements were obtained for both elastic and inelastic ( Q =-4.43 MeV) angular distributions for forward angles for three energies. The rises of cross sections at back angles, however, seem to occur from other mechanisms. Spin and parity assignments were tried for 7.66 and 9.63 MeV levels of carbon.