Evidence for an isovector octupole resonance at 28.4 MeV and other Giant Resonances in 238U
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Authors
Houk, W.A.
Moore, R.W.
Buskirk, F.R.
Pitthan, R.
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Date of Issue
1976
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Monterey, California. Naval Postgraduate School
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Abstract
The deformed, fissionable nucleus 238U was studied with inelastic scattering of 87.5 MeV electrons between 5 and 40 MeV excitation energy, at scattering angles of 45°, 60° 75° and 90°. Resonance cross sections extracted from the spectra were compared with DWBA calculations using the Tassie (Goldhaber-Teller) model. The results agree with the known positions, widths and cross sections of the two branches of the giant dipole resonance at Ex = 10.9 MeV and 14.0 MeV, thus confirming the validity of the evaluation method. In addition, isoscalar and isovector E2 resonances and an isovector EJ resonance were found at 9.9 MeV (r = 2.9), 21.5 MeV (r = 4.9) and 28.4 MeV (r = 8.1), exhausting 40%, 50% and 90% of the respective EWSR. Although isospin cannot be determined from (e,e'), ∆T assignments were based on microscopic and macroscopic considerations.
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Description
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Physics and Chemistry
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Naval Postgraduate School (U.S.)
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National Science Foundation
Naval Postgraduate School Research Foundation
Naval Postgraduate School Research Foundation
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.