dc.contributor.author |
Chisholm, Alexander |
en |
dc.date.accessioned |
2007-08-18T12:06:24Z |
en |
dc.date.available |
2007-08-18T12:06:24Z |
en |
dc.date.issued |
1977 |
en |
dc.identifier |
THESIS 78-137 |
en |
dc.identifier.citation |
Thesis (PhD--Physics)--University of Auckland,1977 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/1485 |
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dc.description |
Full text is available to authenticated members of The University of Auckland only. |
en |
dc.description.abstract |
The analysing power of neutron proton scattering for 14.1 MeV polarized neutrons has been measured at six angles.
Polarized neutrons of 14.1 MeV are generated by the T(d,n)4 He reaction, using vector polarized deuterons of energy about 150 keV produced by an atomic beam polarized ion source. To estimate the neutron polarization, Pn, the source is operated periodically in modes to produce tensor polarized deuterons and the quantity Pzz measured; we take Pn = 2/3 Pzz. Also, Pn is monitored continously throughout the n-p measurements by observing the asymmetry in neutron scattering from carbon. At regular intervals, Pn is reversed by changing the R-F transitions induced in the neutral atomic beam section of the ion source.
A cone of neutrons is defined by detecting the alpha particles from the T(d,n)4 He reaction. The target protons are those in the NE213 liquid scintillator. Neutrons scattered to left and right are detected in four pairs of plastic scintillators. For each event satisfying a triple-coincidence requirement, six parameters are recorded on magnetic tape and the multiparameter spectra are later treated off-line. Low background rates are obtained. A Monte Carlo simulation has demonstrated that the only significant background can be attributed to multiple scattering in the proton target. The simulation showed, further, that the multiple scattering does not give a significant spurious asymmetry.
The statistical errors on the analysing powers are typically 0.003. Systematic errors are believed to be negligibly small in comparison. The overall scale error due to uncertainties in Pn is probably no greater than 3%.
The results are compared with the Yale-IV and Livermore-X phase-shift predictions. We disagree significantly with both predictions, particularly with the Yale-IV magnitude and the Livermore-X shape. From our results, we extract combinations of the triplet P and D phase-shifts. |
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dc.language.iso |
en |
en |
dc.publisher |
ResearchSpace@Auckland |
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dc.relation.ispartof |
PhD Thesis - University of Auckland |
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dc.relation.isreferencedby |
UoA9921832814002091 |
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dc.rights |
Restricted Item. Available to authenticated members of The University of Auckland. |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. |
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dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
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dc.title |
Neutron-proton analysing power at 14 MeV |
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dc.type |
Thesis |
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thesis.degree.discipline |
Physics |
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thesis.degree.grantor |
The University of Auckland |
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thesis.degree.level |
Doctoral |
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thesis.degree.name |
PhD |
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dc.rights.holder |
Copyright: The author |
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dc.identifier.wikidata |
Q112837728 |
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