Scattering of 0. 8 GeV protons from lead-208, carbon-12, and carbon-13. [Angular distributions, J,. pi. ]

The first angular distributions for elastic scattering of 0.8 GeV protons from /sup 12/C, /sup 13/C, and /sup 208/Pb, 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 /sup 208/Pb and many states in /sup 13/C and /sup 12/C, is analyzed in terms of the distorted wave Born approximation (DWBA). The model of coupling a /sup 1///sub 2//sup -/ neutron to the excited states of /sup 12/C is found to explain some of the /sup 13/C excited states. Using this model a new assignment of J/sup ..pi../ = /sup 7///sub 2//sup +/ has been made to the 11.9 MeV state of /sup 13/C. A coupled channels calculation using a 0/sup +/, 2/sup +/, 4/sup +/ rotational band is found to explain the 4/sup +/, 14.1-MeV state in /sup 12/C

Pion double-charge exchange across the (3,3) pi-nucleon resonance. [100 to 300 MeV, preliminary results]

Pion double charge exchange reactions were studied across the (3,3) ..pi..-nucleon resonance. The reactions/sup 16/ /sup 18/0(..pi../sup +/,..pi../sup -/)/sup 16/ /sup 18/Ne and /sup 24/ /sup 26/Mg(..pi../sup +/,..pi../sup -/)/sup 24/ /sup 26/Si were studied from 100 MeV to 300 MeV. Energy excitation functions of dsigma/d..cap omega.. are reported for all targets. Also presented are angular distributions of dsigma/d..cap omega.. for /sup 18/0 and /sup 26/Mg. 13 references