RF Methods to Increase Deuteron Polarization in HD Targets and NMR Spin-Polarization Analysis at LEGS

by Bade, Christopher M

Abstract (Summary)
Double-polarization ?-photoproduction experiments have been conducted at the laser electron gamma source Compton back-scattering facility at Brookhaven National Laboratory. Experiments have been conducted on frozen-spin molecular hydrogen deuteride targets using both polarized proton and polarized deuteron targets. The Strongly Polarized Hydrogen Ice target system was used in these experiments. The targets are polarized in a ^3He/^4He dilution refrigerator at a temperature of 12 mK and a magnetic field of B = 15 T and aged for a number of months. The target’s polarization is measured after aging the target to calculate the polarization of the target during the experiment. The run is conducted in-beam at B = 0.9 T at a temperature of 0.3 K in a cryostat designed with minimal materials in the path of nuclear reaction products. Methods to boost polarization of the target are discussed. The radio frequency transfer of nuclear polarization from H to D by saturating the forbidden H - D resonance is described and results are presented. Forbidden saturation is shown to be more useful and less problematic than forbidden passage with the available target system and equipment. The method for determining polarization from NMR data is described. Additional work would be required to reduce uncertainty in the polarization measurements. Some preliminary results for the D(?,?^0n) reaction which demonstrate the quality of the polarized deuteron target are presented
Bibliographical Information:


School:Ohio University

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:hydrogen deuteride frozen spin polarization nmr pi photoproduction solid target


Date of Publication:01/01/2006

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