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https://hdl.handle.net/2142/25226
Description
Title
The three-body photodisintegration of helium-3
Author(s)
Dezendorf, Peter Nelson
Issue Date
1987
Doctoral Committee Chair(s)
Smith, J.H.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
three-body photodisintegration
helium-3
quasideuteron effect
Language
en
Abstract
The main motivation for the experiment was the determination of the
onset of the quasideuteron effect in 3He. If a neutron and a proton in a
nucleus are interacting and absorb an incident photon, they can break up in a
marrer kinematically similar to a deuteron, hence the name quasideuteron
This effect had previously been seen in 3He above 75 MeV photon energy.
This kinematically complete experiment measured the three-body
photodisintegration of 3He in the photon energy range of 35 to 65 MeV by
means of the coincident detection of a proton and a neutron The
bremsstrahlung beam used was produced by a 68.4 MeV, 0.75 J.lA beam of
electrons from the 100~ duty cycle accelerator Microtron Using a
SUperconductirvJ Linac (MUSL II) at the Nuclear Physics Laboratory of the
University of Illinois at Urbana-Champaign. The 3He target gas was
maintained at 4.3 K and 514 Torr. The proton telescope, neutron detector
and associated electronics were calibrated by the use of deuterium.
The quasideuteron effect could be distinguished in the data at around 45
MeV and predominates by 60 MeV. The strength of the effect was around 50
to 60 J.lb/sr2. However, this cross section was separated by a primitive
procedure; the interference between this and the competing final state
interactions was not taken into account. By integrating over the neutron
angles, a single differential cross section was generated and found to be
about 0.6 times the deuterium cross section from 50 to 65 MeV. The
neutron-proton final state interaction was clearly seen in the data. It is
hoped this experiment will be an inducement for a complete theoretical
treatment applicable to these energies.
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