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B.S., M.S. Department of Physics Doctor of Philosophy

Dissertation Dr. Evan R. Sugarbaker Dr. Richard Furnstahl Dr. Michael Lisa Dr. Richard Kass


Measurements have been made of the complete set of polarization transfer observables in the isovector channel on and using the quasifree reaction at MeV. Data were collected at several different momentum transfers ranging from to . The experiments were carried out at The Indiana University Cyclotron Facility (IUCF) using the swinger experimental area and the INPOL and KSU neutron polarimeters. The observables are used to determine the ratio of the spin longitudinal nuclear response function to the spin transverse nuclear response function .

Recent similar measurements done at MeV at the Los Alamos Meson Physics Facility (LAMPF) seem to indicate that the predicted enhancement of this ratio in the quasifree region does not exist. This discrepancy led to a lot of theoretical interest and several new predictions have been made regarding the ratio, . These include some ``exact'' calculations made using Faddeev techniques and Green's function Monte Carlo (GFMC) techniques, the latter predicting that the enhancement should exist but that it would be distributed away from the quasifree peak and it should be noticeable even in very light nuclei (i.e. , ).

These experimental data agree more closely with the results from GFMC calculations than those from the Faddeev calculations, which may indicate that certain nuclear medium effects, such as high order correlations, are already important in few-body systems. The data is consistent with the results at MeV.

Measurement of Polarization Observables in and using the Quasifree Reaction at 200 MeV

Daniel A. Cooper

To my parents,
who gave me the tools,
and the instructions.

Michael A. Lisa
Tue Apr 1 08:52:10 EST 1997