Polarization in the elastic scattering of protons from carbon and nitrogen
Steben, John David
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https://hdl.handle.net/2142/23982
Description
Title
Polarization in the elastic scattering of protons from carbon and nitrogen
Author(s)
Steben, John David
Issue Date
1965
Doctoral Committee Chair(s)
Brussel, M.K.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
elastic polarized photon scattering
carbon
nitrogen
double scattering techniques
proton energy
polarization angular distributions
Language
en
Abstract
"The polarization of protons elastically scattered from
nitrogen and carbon has been measured using double scattering
techniques 0 The polarization was determined for nitrogen at
a scattering angle of 48°c .mo in the proton energy interval
7.6 to 11.8 MeV. The polarization from carbon '~as determined
-for protons in the energy interval 12. 6 to 1,30 6 MeV.
Polarization angular distributions as well as excitation
functions were obtained in this energy interval. For much
of the data the energy dependence of the 'polarization was
measured with a resolution of 2%. This constitutes a considerable
refinement over previous experiments above 10 MeV. : ,/
The polarization resulting from elastic proton scattering
"" \
'\ with nitrogen targets had a constant value of -0.58+0.10 in
f
the incident proton energy interval 8.2 to 11.7 MeV. The
polarization from carbon, however, varied markedly with
energy at most scattering angles. (Example:
P(501ab, 12 0 9 MeV) := -008 0 P{500 q 13.2) = -0.4, and
P(50°, 13.5) := -0.7.) Throughout the angular range 20° to
140°, polarization measurements from 'carbon covered the
.range of energies,from 1288 to 13.4 MeV. ,In addition,
ilngular distribution data P (e) were 'obtained separately for
the proton .energy ranges 12.8 to 13.1 MeV and 13.1 to 13.4 MeV.
r
The separate p(e) curves differ significantly for' e > 90°.
The energy averaged (12.8 to 13.4 MeV) angular distribution
for the polarization of 13.1 MeV protons scattered from
carbon ~as compared with optical model calculations.
The experimental method involved double scattering, with
the second scattering taking place in a 450 polarimeter. Both
carbon and nitrogen targets were used as the second scatterer.
The proton energies involved in both scatterings were care-
fully monitored with Au-Si surface barrier detectors. The
polarization analyzing properties of the polarimeter were
measured for the carbon (nitrogen) analyzing targets, by
first scattering 8.6 (13. 5) MeV protons from carbon at
70iab(50iab) to obtain a highly polarized beam., The nitrogen
data were taken in this manner. The p(e,E) ,data described for
Cl2 (P/P) near 13 MeV were then obtained using the carbon first
target as the polqrization to be measured.
The present polarimeter, when used .with a nitrogen target
l and solid state detectors, has an overall resolution of 3% and
a-'constant polariztion (analyzing>power) 0;: 0. 6±.0.1 for protons of 9to 12.5 MeV. It, would be extremely useful for
polarization experiments involving several nuclear-reaction
with 'prdtbn 'groups close in energy ,such a's are obtained ill;
inelastic scattering from isotopes of A ~ 50."
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