Computer Science
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........69a&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF NOTRE DAME, 1991.Source: Dissertation Abstracts International, Volume: 52-05, Section: B, page: 26
Computer Science
Deuteron, Helium-3 Proton)Neutron And Helium-3(Deuteron, Triton Proton)Proton Reactions Using 17 Mev Polarized Deuterons (Triton, Deuterons, Helium-3
Scientific paper
The ^3He(vec d, ^3He p)n and ^3He(vec d, t p)p reactions were studied in kinematically -complete geometry at a deuteron energy of 17 MeV. Cross sections and vector analyzing powers were measured at several sets of angles to investigate: (a) the importance of quasi -free scattering (QFS) or quasi-free reaction (QFR) processes, and (b) the effects of the nucleon-nucleon final-state interaction (NN FSI). The tensor analyzing powers T _{20} and T_{22 }, were also measured at two sets of angles. At the angle pairs where the QFS/QFR mechanism is dominant, the data were compared with the predictions of plane-wave impulse-approximation (PWIA) and distorted-wave impulse approximation (DWIA) calculations. Both calculations are only partly successful in describing the shapes of the quasi-free peaks, with the DWAI doing better in predicting their magnitudes. The vector analyzing powers (VAP) in the quasi-free region are at best only qualitatively reproduced by both calculations for the QFS, while for the QFR there is some quantitative agreement between both calculations and the data. Data obtained at the angle pairs where the NN FSI is dominant, were compared to the predictions of simple two-step calculations. The reaction is assumed to take place in two stages, with the pickup of a nucleon from the ^3He by the deuteron as the first step, and the breakup of the recoil dinucleon system (assumed to be in a ^1S _0 state) as the second step. The calculations describe the shapes of the NN FSI peaks reasonably well. The DWBA-predicted normalizations for the transfer reaction are of the same order of magnitude as the observed ones. For the most part, the VAP predictions are consistent with the two-step assumption. Also seen in the data are evidences of nucleon-trion FSI corresponding to resonances in ^4He and ^4Li. The impulse-approximation fails to provide an adequate description of the QFS/QFR processes, while the two-step calculations do not provide a complete description of the NN FSI. At the least, a more refined treatment, such as a Faddeev -type three-body calculation, is probably required in understanding these reactions.
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