{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25095"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25095","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"A coincident measurement of the three-body photodisintegration of helium-3","abstract":"This experiment measured coincident neutron-proton pairs from the photodisintegration of 3He. The bremsstrahlung photon beam was produced by a 100 MeV electron beam, supplied by the University of Illinois Nuclear Physics Laboratory 100 % duty factor electron microtron. The energy and angle of the np pairs were used to reconstruct the energy of the photon, making this a kinematically complete experiment. The 3He(gamma ,np )p data were normalized to measured 2H(gamma ,np) yields and published deuterium photodisintegration cross sections. The target was a cryogenic system which maintained the 3He gas at liquid 4He temperature. Protons were detected with a dE-E scintillation telescope and neutrons with a position sensitive scintillation array. The proton energy was determined from the energy deposited in a Nai crystal and the neutron energy from the time of flight over a 4 m path. The neutron and proton were detected on opposite sides of the photon beam at opening angles from 122-202 degrees in the lab frame. Quasi-deuteron breakup events were detected for photon energies of 45-95 MeV. Strong final state interactions prohibited an accurate determination of the quasideuteron contribution to the cross section. The single differential cross section ([greek letters]) for 3He at Theta P = 81° was determined by integrating the neutron angular distribution. This cross section, relative to deuterium, ranged from 2.39±.16 at 55 MeV to 1.67±.27 at 95 MeV.","abstract_html":"This experiment measured coincident neutron-proton pairs from the photodisintegration of 3He. The bremsstrahlung photon beam was produced by a 100 MeV electron beam, supplied by the University of Illinois Nuclear Physics Laboratory 100 % duty factor electron microtron. The energy and angle of the np pairs were used to reconstruct the energy of the photon, making this a kinematically complete experiment. The 3He(gamma ,np )p data were normalized to measured 2H(gamma ,np) yields and published deuterium photodisintegration cross sections. The target was a cryogenic system which maintained the 3He gas at liquid 4He temperature. Protons were detected with a dE-E scintillation telescope and neutrons with a position sensitive scintillation array. The proton energy was determined from the energy deposited in a Nai crystal and the neutron energy from the time of flight over a 4 m path. The neutron and proton were detected on opposite sides of the photon beam at opening angles from 122-202 degrees in the lab frame. Quasi-deuteron breakup events were detected for photon energies of 45-95 MeV. Strong final state interactions prohibited an accurate determination of the quasideuteron contribution to the cross section. The single differential cross section ([greek letters]) for 3He at Theta P = 81° was determined by integrating the neutron angular distribution. This cross section, relative to deuterium, ranged from 2.39±.16 at 55 MeV to 1.67±.27 at 95 MeV.","abstract_has_math":false,"creators":["Kolb, Norman Reed"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Smith, J.H."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-06-01T14:34:40Z","date_published":"2011-06-01T14:34:40Z","updated_at":"2026-07-22T22:25:24Z","subjects":["coincident neutron proton pairs","photodisintegration","Helium-3 (3He)","bremsstrahlung photon beam"],"languages":["en"],"rights":["1990 Norman Reed Kolb"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["1856825"],"render_values":[{"text":"1856825","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25095","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Smith, J.H."]},{"key":"dc:creator","label":"Author","values":["Kolb, Norman Reed"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-06-01T14:34:40Z","10000-01-01","1990"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["coincident neutron proton pairs","photodisintegration","Helium-3 (3He)","bremsstrahlung photon beam"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1990 Norman Reed Kolb"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["1856825","http://hdl.handle.net/2142/25095"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This experiment measured coincident neutron-proton pairs from the photodisintegration of 3He. The bremsstrahlung photon beam was produced by a 100 MeV electron beam, supplied by the University of Illinois Nuclear Physics Laboratory 100 % duty factor electron microtron. The energy and angle of the np pairs were used to reconstruct the energy of the photon, making this a kinematically complete experiment. The 3He(gamma ,np )p data were normalized to measured 2H(gamma ,np) yields and published deuterium photodisintegration cross sections. The target was a cryogenic system which maintained the 3He gas at liquid 4He temperature. Protons were detected with a dE-E scintillation telescope and neutrons with a position sensitive scintillation array. The proton energy was determined from the energy deposited in a Nai crystal and the neutron energy from the time of flight over a 4 m path. The neutron and proton were detected on opposite sides of the photon beam at opening angles from 122-202 degrees in the lab frame. Quasi-deuteron breakup events were detected for photon energies of 45-95 MeV. Strong final state interactions prohibited an accurate determination of the quasideuteron contribution to the cross section. The single differential cross section ([greek letters]) for 3He at Theta P = 81° was determined by integrating the neutron angular distribution. This cross section, relative to deuterium, ranged from 2.39±.16 at 55 MeV to 1.67±.27 at 95 MeV.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-01T14:34:40Z No. of bitstreams: 1 1990_kolb.pdf: 6158735 bytes, checksum: ab0c9e064a07881954330f01cb64f092 (MD5)","Made available in DSpace on 2011-06-01T14:34:40Z (GMT). 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The bremsstrahlung photon beam was produced by a 100 MeV electron beam, supplied by the University of Illinois Nuclear Physics Laboratory 100 % duty factor electron microtron. The energy and angle of the np pairs were used to reconstruct the energy of the photon, making this a kinematically complete experiment. The 3He(gamma ,np )p data were normalized to measured 2H(gamma ,np) yields and published deuterium photodisintegration cross sections. The target was a cryogenic system which maintained the 3He gas at liquid 4He temperature. Protons were detected with a dE-E scintillation telescope and neutrons with a position sensitive scintillation array. The proton energy was determined from the energy deposited in a Nai crystal and the neutron energy from the time of flight over a 4 m path. The neutron and proton were detected on opposite sides of the photon beam at opening angles from 122-202 degrees in the lab frame. Quasi-deuteron breakup events were detected for photon energies of 45-95 MeV. Strong final state interactions prohibited an accurate determination of the quasideuteron contribution to the cross section. The single differential cross section ([greek letters]) for 3He at Theta P = 81° was determined by integrating the neutron angular distribution. This cross section, relative to deuterium, ranged from 2.39±.16 at 55 MeV to 1.67±.27 at 95 MeV.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-01T14:34:40Z No. of bitstreams: 1 1990_kolb.pdf: 6158735 bytes, checksum: ab0c9e064a07881954330f01cb64f092 (MD5)","Made available in DSpace on 2011-06-01T14:34:40Z (GMT). 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