Angular distribution of photoneutrons from deuterium

<p>A photon beam of E<sub>γ</sub>max = 125 MeV, produced by the Saskatchewan electron linear accelerator, was used to irradiate a deuteron target. The deuteron target was viewed simultaneously by five neutron detectors located respectively at 30°, 60°:, 90°, 112° and 142° to...

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Main Author: Evwaraye, Andrew Oteku
Other Authors: Rawlins, John A.
Format: Others
Language:en
Published: University of Saskatchewan 2012
Online Access:http://library.usask.ca/theses/available/etd-07182012-090623/
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spelling ndltd-USASK-oai-usask.ca-etd-07182012-0906232013-01-08T16:35:34Z Angular distribution of photoneutrons from deuterium Evwaraye, Andrew Oteku <p>A photon beam of E<sub>γ</sub>max = 125 MeV, produced by the Saskatchewan electron linear accelerator, was used to irradiate a deuteron target. The deuteron target was viewed simultaneously by five neutron detectors located respectively at 30°, 60°:, 90°, 112° and 142° to the incident photon beam.</p> <p>The measured angular distributions were compared with the theoretical calculations using Hamada- Johnston and Boundary Condition Model potentials. The results of this experiment were also compared with previous measurements where they overlap. Good agreement was found between the present measurements and theoretical predictions in the energy region of E<sub>γ</sub>â¤40 MeV. The shape of the angular distributions in this energy region is approximately sin <sup>2</sup>Î as expected.</p> <p>There is no strict agreement between the present measurements and the theoretical predictions at E<sub>γ</sub>â¤55 MeV. Though the non-phenomenological potential, the Boundary Condition model potential, appears to give better predictions of the angular distributions than the Hamada- Johnson potential. The apparent disagreement between the present work and previous experiments at backward angles is interpreted to be due to the large uncertainties in the background subtraction in the forward proton angles, as all previous workers detected in the outgoing protons in the reaction D (γ, p) n. The large isotropic contribution observed is interpreted to be due to tensor forces both in the ground and final states as well as spin-orbit forces in the final state.</p> Rawlins, John A. University of Saskatchewan 2012-07-18 text application/pdf http://library.usask.ca/theses/available/etd-07182012-090623/ http://library.usask.ca/theses/available/etd-07182012-090623/ en unrestricted I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to University of Saskatchewan or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.
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description <p>A photon beam of E<sub>γ</sub>max = 125 MeV, produced by the Saskatchewan electron linear accelerator, was used to irradiate a deuteron target. The deuteron target was viewed simultaneously by five neutron detectors located respectively at 30°, 60°:, 90°, 112° and 142° to the incident photon beam.</p> <p>The measured angular distributions were compared with the theoretical calculations using Hamada- Johnston and Boundary Condition Model potentials. The results of this experiment were also compared with previous measurements where they overlap. Good agreement was found between the present measurements and theoretical predictions in the energy region of E<sub>γ</sub>â¤40 MeV. The shape of the angular distributions in this energy region is approximately sin <sup>2</sup>Î as expected.</p> <p>There is no strict agreement between the present measurements and the theoretical predictions at E<sub>γ</sub>â¤55 MeV. Though the non-phenomenological potential, the Boundary Condition model potential, appears to give better predictions of the angular distributions than the Hamada- Johnson potential. The apparent disagreement between the present work and previous experiments at backward angles is interpreted to be due to the large uncertainties in the background subtraction in the forward proton angles, as all previous workers detected in the outgoing protons in the reaction D (γ, p) n. The large isotropic contribution observed is interpreted to be due to tensor forces both in the ground and final states as well as spin-orbit forces in the final state.</p>
author2 Rawlins, John A.
author_facet Rawlins, John A.
Evwaraye, Andrew Oteku
author Evwaraye, Andrew Oteku
spellingShingle Evwaraye, Andrew Oteku
Angular distribution of photoneutrons from deuterium
author_sort Evwaraye, Andrew Oteku
title Angular distribution of photoneutrons from deuterium
title_short Angular distribution of photoneutrons from deuterium
title_full Angular distribution of photoneutrons from deuterium
title_fullStr Angular distribution of photoneutrons from deuterium
title_full_unstemmed Angular distribution of photoneutrons from deuterium
title_sort angular distribution of photoneutrons from deuterium
publisher University of Saskatchewan
publishDate 2012
url http://library.usask.ca/theses/available/etd-07182012-090623/
work_keys_str_mv AT evwarayeandrewoteku angulardistributionofphotoneutronsfromdeuterium
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