Nucleon Knockout and Nucleon Transfer Reactions at Intermediate Energies.

Details Nucleon Knockout and Nucleon Transfer Reactions at Intermediate Energies. Nucleon Knockout and Nucleon Transfer Reactions at Intermediate Energies.

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........51m&link_type=abstract

Thesis (PH.D.)--UNIVERSITY OF MINNESOTA, 1995.Source: Dissertation Abstracts International, Volume: 56-03, Section: B, page: 149

Physics

Scientific paper

This dissertation presents two topics: the study of a nucleon knockout reaction and the study of a two-nucleon transfer reaction at intermediate energies. In principle, both of these reactions allow one to study the structure of the nucleus along with the nucleon-nucleon interaction responsible for the reaction mechanism. The first topic presents the experimental and theoretical development of the ^ {40}Ca(| p,2p) reaction at 800 MeV incident energy, as a means of studying the nucleon -nucleon interaction in the nuclear medium. The experimental work was performed at the Clinton P. Anderson Meson Physics Facility (LAMPF) in Los Alamos, New Mexico, using the Medium Resolution Spectrometer (MRS) and a position-sensitive proton telescope. The proton telescope consisted of a horizontal array of CsI(pure) crystals that operated as both position and energy detectors. The position resolution of the telescope was found to be around 6% (FWHM) and the energy resolution was found to be DeltaE/E = 3-4% (FWHM). Theoretical calculations have shown that the nucleon-nucleon interaction is expected to be modified in the nuclear medium when compared with the free interaction. The type of modification to the interaction is based on recent relativistic ideas related to the meson and nucleon mass scaling in the nuclear medium. This modification should manifest itself as an enhancement of the cross section and a reduction of the analyzing power of the observed quasifree nucleon knockout scattering. The second topic presents the experimental study of the ^{208}Pb(| p,t)^{206}Pb reaction at 120 MeV incident energy. The measurements were taken at the Indiana University Cyclotron Facility (IUCF) in Bloomington, Indiana. In this work all the low-excitation high-spin natural parity states in ^{206}Pb were resolved and angular distributions of cross sections and analyzing powers were measured. These states were shown to be quasipure two-neutron-hole configurations and a complete spectroscopic study was performed. The reaction was described sufficiently by the zero-range DWBA which revealed an energy dependence of the normalization constant. The analysis of the experimental data showed that the most dominant part of the residual interaction was the singlet-even, at 120 MeV probing energy. Finally, no signature of unnatural parity transitions, which would indicate sequential two -nucleon transfer mechanism, was found in the data.

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