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Smith, J.H. Kolb, Norman Reed 2011-06-01T14:34:40Z 2011-06-01T14:34:40Z 10000-01-01 1990 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). No. of bitstreams: 1 1990_kolb.pdf: 6158735 bytes, checksum: ab0c9e064a07881954330f01cb64f092 (MD5) Previous issue date: 1990 Restriction data tranferred 2014-07-01T11:12:27-05:00 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 2011-06-01T14:34:41Z Item is restricted indefinitely. Thesis U of I Only 1856825 http://hdl.handle.net/2142/25095 en 1990 Norman Reed Kolb coincident neutron proton pairs photodisintegration Helium-3 (3He) bremsstrahlung photon beam A coincident measurement of the three-body photodisintegration of helium-3 Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.