Scattering of 0.8GeV Protons from Lead-208,Carbon-12,and Carbon-13.

摘要

The first angular distributions for elastic scattering of 0.8GeV protons from exp 12 C,exp 13 C,and exp 208Pb,obtained using the High Resolution Spectrometer (HRS) at the Clinton P. Anderson Meson Physics Facility (LAMPF) at the Los Alamos Scientific Laboratory,are presented. A brief description is given of an analysis of the elastic scattering data in terms of the Kerman-McManus-Thaler formalism with spin dependent nucleon-nucleon amplitudes. The data are shown to be sensitive to details of proton and neutron matter distributions. The proton distributions as determined by electromagnetic probes are used along with the available spin independent nucleon-nucleon scattering amplitudes. Preliminary analyzing power measurements are used to fix the spin-dependent amplitudes. The neutron distributions are adjusted to fit the data. Inelastic scattering of protons,exciting the first two states of exp 208Pb and many states in exp 13 C and exp 12 C,is analyzed in terms of the distorted wave Born approximation (DWBA). The model of coupling a exp 1 /sub 2-neutron to the excited states of exp 12 C is found to explain some of the exp 13 C excited states. Using this model a new assignment of J/sup pi / =exp 7 /sub 2+has been made to the 11.9MeV state of exp 13 C. A coupled channels calculation using a 0exp + , 2exp + , 4exp +rotational band is found to explain the 4exp + , 14.1-MeV state in exp 12 C. (ERA citation 03:051456)