An absolute measurement of the photodisintegration of deuterium
Knott, Jonathan Edward
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https://hdl.handle.net/2142/23919
Description
Title
An absolute measurement of the photodisintegration of deuterium
Author(s)
Knott, Jonathan Edward
Issue Date
1988
Doctoral Committee Chair(s)
Debevec, Paul T.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
absolute measurement
photodisintegration
deutrerium
differential cross section
photon energy
Language
en
Abstract
This experiment measured the differential cross section for deuteron photodisintegration between photon energies of 63 and 71 MeV. The photon beam was produced by the bremsstrahlung of an 88.4 Me V CW electron beam, from the University of Illinois Nuclear Physics Laboratory electron microtron, in a 1.4 x10-3 radiation length aluminum converter. The photon energy was determined to .25 MeV by the technique of bremsstrahlung tagging. The tagged flux was typically 3 xl06 Hz. The tagged flux was normalized by direct counting of the photon beam with a large N aI detector.
The deuterium target gas, at atmospheric pressure, was contained in a thin walled cylinder 2.4 m long. The protons from deuteron photodisintegration were detected in the LArge Solid Angle detector, which was built for this experiment. The LASA detector consists of three concentric, cylindrical MWPC chambers surrounded by segmented plastic scintillators. The target cylinder is on the axis of the chamber. Particles were collected from 20° to 160°, the angle determined by the charge division technique in the wire chamber. The ~~ measurements in the wire chamber and the scintillators allowed the separation of protons from electrons. Timing coincidences in the scintillators with the photon tagging counters allowed the randomly-timed background to be subtracted.
The differential cross sections have been fit by Legendre polynomials. These results are in reasonable agreement with previous experiments and theoretical calculations.
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