The scattering of protons by C¹²

[摘要] The scattering of protons from carbon in the range of bombarding energies 4.7 to 12.8 MeV has been Investigated. The protons were accelerated by the Rice University tandem Van de Graaff, and a differentially pumped small volume gas scattering chamber was used with solid state detectors and a scintillation counter. Excitation functions for elastic and inelastic scattering at laboratory angles of 85.22°, 121.16°, and 159.45° in the range of bombarding energies 4.7 to 12.8 MeV and 6. to 12.8 MeV, respectively, were measured in steps of 2.5 to 2 keV. Twelve angular distributions for elastic and inelastic scattering were measured between the laboratory angles 2° to l6° and in the incident proton energy range 8.52 to 9.366 MeV. The single-level approximation of dispersion theory has been employed to investigate the excited states of the compound nucleus N in the excitation energy region 6.3 to 13.7 MeV. In the case of the C^ + p system, the situation was found not to be ideal for this type of approximate dispersion theory analysis, but the experimental data were fitted moderately well, enabling some level parameters to be assigned. In general, the calculated cross sections gave excellent agreement to the experimental resonance shapes, but the cross section magnitudes were in large disagreement at places in the elastic excitation functions.

[发布机构] Rice University