Pion Elastic and Inelastic Scattering from 15N
Abstract
Data were obtained on the Energetic Pion Channel and Spectrometer for elastic and inelastic pion scattering from ground state Nitrogen 15 nuclei. States observed here included those of 0.0, 5.27, 6.32, 7.16, 7.30, 7.57, 8.31, 8.57, 9.15, 9.76, 9.9, 10.7, 11.3, 11.9, 12.5, 12.9, 13.1, 14.1, 14.4, 14.6, 15. 0, 16.5, 16.9, 17.2, 17.6, 18.3, 18.7, 18.9 MeV excitation energies. Angular distributions were obtained for scattering at angles from 25 to 90 in 5 increments with an incident pion energy of 164 MeV. Optical model analyses of the elastic (0 MeV) angular distributions with equal point proton and neutron densities in both momentum and coordinate space formulations accurately predict the data, although the two formulations require different energy shifts to do so. This difference is thought to be a result of the more accurate nonlocal representation of the nuclear potential in the momentum space code. Additional spectra were obtained for scattering at constant momentum transfers of .94 and 1.57/fm in order to generate constant momentum transfer excitation functions. Use of these excitation functions, cross section ratios, and shell model DWIA calculations allowed identification of several excited states having shell- model-like, single particle-hole, pure spin-flip excitations. Shell model and collective model DWIA calculations, as well as the q = .94 and 1.57/fm excitation functions and the cross section ratios indicate that the other states are generally well represented by a shell model description with collective enhancements.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1991
- Accession Number
- ADA239311
Entities
People
- David P. Saunders
Organizations
- Air Force Institute of Technology