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Title:A coincident measurement of the three-body photodisintegration of helium-3
Author(s):Kolb, Norman Reed
Doctoral Committee Chair(s):Smith, J.H.
Department / Program:Physics
Subject(s):coincident neutron proton pairs
Helium-3 (3He)
bremsstrahlung photon beam
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.
Issue Date:1990
Genre:Dissertation / Thesis
Rights Information:1990 Norman Reed Kolb
Date Available in IDEALS:2011-06-01
Identifier in Online Catalog:1856825

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