An absolute calibration of the analysing powers of hydrogen and helium-4 has been performed at 24° and 15° lab, respectively, for protons between 200 and 520 MeV with a typical uncertainty of ±2%. In a double scattering experiment, the TRIUMF polarized proton beam was scattered, first at 15° on a liquid helium target, then a second time at 24° on a polyethylene target. The method combines the advantages of the very high analysing power of helium and the small difference in incident energies on both scatters.
The analysing power of helium-4 was measured to be 0.964 ± .012, 0.792 ± .011 and 0.476 ± .018 at energies of 222, 325 and 518 MeV, respectively.
The analysing power of hydrogen was found to be 0.294 ± 0.003, 0.354 ± 0.005 and 0.412 ± 0.013 at proton energies of 205, 308 and 499 MeV, respectively. This represents a great improvement over previous p-p data which was not known to better than ±6%, and so will permit a more accurate determination of nucleon-nucleon phase shifts. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/21071 |
Date | January 1978 |
Creators | Dubois, Richard |
Source Sets | University of British Columbia |
Language | English |
Detected Language | English |
Type | Text, Thesis/Dissertation |
Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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