Elastic scattering cross sections for 65 MeV neutrons have been measured for natural targets of C, Si, Cd, Fe, Sn, and Pb at laboratory angles from 6' to 45'. A unique, compact detection system consisting of a CHq (proton) converter and large-acceptance, wire-chamber-based, recoilproton telescope is utilized for the measurements. The data are compared with macroscopic optical model potentials derived from proton scattering. In addition, comparisons with the microscopic optical model potentials, those of 3eukenne-Lejeune-Mahaux and Yamaguchi-Nagata-Matsuda, give a very good at to the data.
Abstract. When a shock wave interacts at the surface of a metal sample "ejected matter" (ejecta) can be emitted from the surface. The mass, size, shape, and velocity of the ejecta varies depending on the initial shock conditions and the material properties of the target. To understand this phenomena, experiments have been conducted at the Pegasus Pulsed Power Facility (PPPF) located at Los Alamos National Laboratory (LANL). The facility is used to implode cylinders to velocities of many mm/msec. The driving cylinder impacts a smaller target cylinder where shock waves of a few hundreds of kilobars can be reached and ejecta formation proceeds. The ejecta particle sizes are measured for shock loaded Sn and Al metal samples using an in-line Fraunhofer holography technique. The distributions will be compared to calculations from 3 and 2 dimensional percolation theory.
The C(n, p) B reaction was studied using the white neutron source at the Los Alamos Meson Physics Facility/Weapons Neutron Research center with a continuous incident neutron energy from 60 to 260 MeV. Double differential cross sections were measured in the angular range 11 ( Ol b & 37'. Using the neutron time-of-Right facility at the Indiana University Cyclotron Facility, we also studied the C(p, n) N reaction at R"= 186 MeV and the C(p, n) N reaction at E~= 160 and 186 MeV. Double differential cross sections were measured between Ol b --0 and Ol b --50' in 5' steps. Spin observables D&&, A&, and P were measured at Hi b --5', 9', 13' with Ep = 160 MeV and Hl b --15, 20' with Ep = 186 MeV. Angular distributions of differential cross section and spin observables for low-lying transitions in the residual nuclei are compared with distorted-wave impulse approximation (DWIA) calculations. A multipole decomposition analysis was performed to study the giant dipole and giant spin-dipole resonances. The contributions of the quasifree reaction in the giant resonance region were subtracted. The empirical results of energy distributions for dipole (AL = 1) transition are compared with DWIA calculations using nuclear structure information obtained with a conventional shell model and also with a random phase approximation. PACS number(s): 25.40.Hs, 27.40.+z
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