Study of transverse excitations in the giant resonance region of 236U using the (e,e'f) reaction.
Serdarevic, Amra
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https://hdl.handle.net/2142/18864
Description
Title
Study of transverse excitations in the giant resonance region of 236U using the (e,e'f) reaction.
Author(s)
Serdarevic, Amra
Issue Date
1993-10
Doctoral Committee Chair(s)
Papanicolas, Costas N.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
(e,e'f) reaction
Uranium-236 (236U)
uranium
transverse excitations
Language
en
Abstract
We measured 236U(e,e'f) coincidence cross sections at six values of the momentum
transfer (qeff ~ 0.50, 0.72, 0.84, 0.95, 0.97 and 1.16 fm-1
) at both forward (Oe = 50°,
75° , 110°) and backward angles (Oe = 160°), over an excitation energy range from
2 to 18 MeV. The backward angle data were taken with the aim of enhancing the
transverse part of the cross section, which contains contributions from currents other
than the convection currents. Due to the necessity to treat the data in the DWBA no
model-independent multipole decomposition was possible. The data were integrated
over the fission angle and compared with the calculations using both the Tassie model
and the QRPA form factors. At the two lowest momentum transfers the data are
well described by the inclusion of the electric multipoles of L = 0, 1, 2 and 3 transitions.
For higher momentum transfers and backward angles higher multipolarities
are needed. Comparison of our results with the forthcoming QRPA calculations for
uranium will show the importance of the effects of the magnetic excitations in the
description of the collective states.
We developed and constructed a 47r Parallel Plate Avalanche Detector array for
the detection of fission fragments . It consists of up to 13 PPADs mounted on a modular
geodesic dome. An extensive study of the behavior of PPADs in the electron beam
environment was done, with the electron beam currents between 200 nA and 8 11A.
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