A coincident measurement of the three-body photodisintegration of helium-3
Kolb, Norman Reed
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https://hdl.handle.net/2142/25095
Description
Title
A coincident measurement of the three-body photodisintegration of helium-3
Author(s)
Kolb, Norman Reed
Issue Date
1990
Doctoral Committee Chair(s)
Smith, J.H.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
coincident neutron proton pairs
photodisintegration
Helium-3 (3He)
bremsstrahlung photon beam
Language
en
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.
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