Proton -Deuteron Elastic Scattering and Three -Nucleon Forces
Cadman, Robert Victor
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https://hdl.handle.net/2142/80461
Description
Title
Proton -Deuteron Elastic Scattering and Three -Nucleon Forces
Author(s)
Cadman, Robert Victor
Issue Date
2001
Doctoral Committee Chair(s)
Roy J. Holt
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Nuclear
Language
eng
Abstract
The spin observables Ay, iT 11, and Cy,y in proton-deuteron elastic scattering were measured over the angular range 65° < theta cm < 115° at a proton energy Tlab = 197 MeV. These data were acquired with a polarized proton beam and an internal vector-polarized deuteron gas target at the Indiana University Cyclotron Facility. The target was polarized by spin exchange with optically-pumped potassium; this experiment was the first to use this novel technique for polarizing hydrogen and deuterium. The data have been compared to existing Faddeev calculations using modern two-nucleon potentials which accurately reproduce the available two-nucleon scattering data. The calculations were also performed with the addition of the Tucson-Melbourne three-nucleon potential to identify kinematic regimes where the three-nucleon force makes a significant contribution. One such regime is in the vicinity of the minimum in the differential cross section for nucleon-deuteron elastic scattering at nucleon energies T lab ≳ 100 MeV, which includes the region covered by this experiment. The failure of calculations using only two-nucleon potentials to reproduce the results of this experiment is interpreted as evidence that some type of three-nucleon force is needed to explain the data.
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