Electron disintegration of helium between 45 and 100 MeV
Murphy, James Jefferson
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https://hdl.handle.net/2142/25865
Description
Title
Electron disintegration of helium between 45 and 100 MeV
Author(s)
Murphy, James Jefferson
Issue Date
1971
Doctoral Committee Chair(s)
Hanson, A.O.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
electron disintegration
helium
differential cross sections
virtual photon spectra
Language
en
Abstract
The differential cross section of 4He(e,efn)3He:,was
measured at five angles over an energy range of 45-100 MeV.
Electrons from the National Bureau of Standards 120 MeV, 40 kW
linear electron accelerator struck a gaseous-He target. The
charged reaction products were detected by 10 lithium drifted
silicon detectors cooled to 770K located in the focal plane of
the d~ub1e focusing 1200 wedge magnet of the positive ion spectrometer.The amplified pulses from the detectors, after conversion
to digital form, were recorded and stored in an IDS 920
computer. The resulting pulse height spectra exhibited distinct
peaks corresponding to tritons, deuterons, protons and 3He fs.
The data were analyzed using virtual photon spectra
to- yield photodisintegration, cross sections corresponding to the
reaction 4He (y,h)3He . The resulting differential cross sections
are consistent with the form go = A Sin2e(l + ~ cos e). The
sin2e
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