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Study of transverse excitations in the giant resonance region of 236U using the (e,e'f) reaction.

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Title: Study of transverse excitations in the giant resonance region of 236U using the (e,e'f) reaction.
Author(s): Serdarevic, Amra
Doctoral Committee Chair(s): Papanicolas, C. N.
Department / Program: Physics
Discipline: Physics
Degree: Ph.D.
Genre: Dissertation
Subject(s): (e,e'f) reaction 236U uranium transverse excitations
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.
Issue Date: 1993-10
Genre: Dissertation / Thesis
Type: Text
Language: English
Rights Information: 1993 Amra Serdarevic
Date Available in IDEALS: 2011-04-25
Identifier in Online Catalog: 3644326

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