Type of Document	Dissertation
Author	Roeder, Brian T.
Author's Email Address	roeder@nucmar.physics.fsu.edu
URN	etd-06222006-032550
Title	Direct Reactions with Exotic Beams and Polarized Lithium Beams
Degree	Doctor of Philosophy
Department	Physics, Department of
Advisory Committee	Advisor Name Title Kirby Kemper Committee Chair Brooks Keel Committee Member Ed Myers Committee Member Ingo Wiedenhoever Committee Member Jorge Piekarewicz Committee Member
Keywords	Direct Reactions Exotic Beams Liquid Deuterium Target Polarized Lithium Beam
Date of Defense	2006-05-12
Availability	unrestricted
Abstract In the first two chapters of this dissertation, the total cross sections for 38 different reaction products produced in the interaction of 48Ca, 40S and 42S beams at energies around 100 MeV/nucleon with a liquid deuterium target are reported. The cross sections for the 48Ca+d products are compared to those with 48Ca incident on the commonly used fragmentation targets 9Be and 181Ta, and also to global calculations for fragmentation reaction cross sections based on the EPAX parameterization performed with the program LISE. The sizes of the measured reaction cross sections for the deuterium target were comparable to the cross sections measured on the heavier targets indicating that both nucleon addition and removal from a deuterium target can be carried out for comparative “stripping” and “pickup” reaction studies. It was also found that the charge exchange cross sections were large enough so that it should be possible to obtain nuclear structure information from these reactions. Calculations using the Johnson-Soper adiabatic model and Eikonal nucleon knockout theory were performed to study the reaction mechanisms for the “stripping” and “pickup” reactions studied in the experiment. It was found that the magnitude of the cross sections for both the single nucleon “stripping” and single nucleon “pickup” reactions were consistent with the assumption that they proceeded as direct, single step reactions. In the third chapter of this dissertation, the recent upgrade to the Florida State University Optically Pumped Polarized Lithium Ion Source (OPPLIS) is summarized. A new laser system was installed, and the laser optics were modified to increase the laser power available for optically pumping the lithium atomic beam from about 40 mW to nearly 200 mW. This improvement, along with proper alignment of the laser beam divergence to the atomic beam divergence, increased the vector polarization t10 of the beam on-target from about 40% to about 60%.
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