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    Absolute calibration of a retarding-potential Mott polarimeter

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    Author
    Oro, David Michael
    Date
    1992
    Advisor
    Dunning, F. B.
    Degree
    Master of Science
    Abstract
    Mott polarimeters are used in many areas of physics to determine the spin polarization of electrons in studies of processes dependent on the electron's intrinsic spin angular momentum and associated spin magnetic moment. Mott polarimeters work by measuring the left-right asymmetry in the spatial distribution of electrons scattered from high-Z nuclei. The polarization of the incident electrons is related to the measured asymmetry via a parameter known as the effective asymmetry (Sherman) function, S$\sb{\rm eff}$, which must be determined through calibration. This work describes a novel technique for calibrating a Mott polarimeter that makes use of electrons of accurately known polarization obtained through Penning ionization reactions involving electron spin polarized He(2$\sp3$S) metastable atoms. This technique has been used to calibrate a compact retarding-potential Mott polarimeter, and the values of S$\sb{\rm eff}$ are presented for both gold and thorium target foils under a variety of operating conditions.
    Keyword
    Condensed matter physics; Atomic physics
    Citation
    Oro, David Michael. "Absolute calibration of a retarding-potential Mott polarimeter." (1992) Master’s Thesis, Rice University. http://hdl.handle.net/1911/13682.
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    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892