2026-09-20T08:06:51Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/23982 2023-07-10 col_2142_8859 col_2142_5131 com_2142_8858 com_2142_234 com_2142_5130

Brussel, M.K. Steben, John David 2011-05-20T15:37:25Z 2011-05-20T15:37:25Z 10000-01-01 1965 "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." Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-20T15:37:25Z No. of bitstreams: 1 1965_steben.pdf: 7520946 bytes, checksum: 9d64b475eda0142b06e4b147a5d7e4cc (MD5) Made available in DSpace on 2011-05-20T15:37:25Z (GMT). No. of bitstreams: 1 1965_steben.pdf: 7520946 bytes, checksum: 9d64b475eda0142b06e4b147a5d7e4cc (MD5) Previous issue date: 1965 Restriction data tranferred 2014-07-01T11:13:28-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-05-20T15:37:25Z Item is restricted indefinitely. Thesis U of I Only 6187535 http://hdl.handle.net/2142/23982 en 1965 John David Steben elastic polarized photon scattering carbon nitrogen double scattering techniques proton energy polarization angular distributions Polarization in the elastic scattering of protons from carbon and nitrogen Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.