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Phys. Rev. C 70, 064305 (2004) [7 pages]

Compton scattering of polarized γ rays by 16O for Eγ=25–40 MeV

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B. A. Perdue, M. W. Ahmed, A. P. Tonchev, and H. R. Weller
Triangle Universities Nuclear Laboratory, Duke University, P.O. Box 90308, Durham, North Carolina 27708, USA

G. Feldman
Department of Physics, George Washington University, Washington, D.C. 20052, USA

V. N. Litvinenko and I. V. Pinayev
Duke Free Electron Laser Laboratory, Duke University, P.O. Box 90319, Durham, North Carolina 27708, USA

B. E. Norum
Department of Physics, University of Virginia, P.O. Box 400714, Charlottesville, Virginia 22903, USA

R. M. Prior and M. C. Spraker
North Georgia College & State University, Dahlonega, Georgia 30597, USA

B. D. Sawatzky
Department of Physics, University of Virginia, P.O. Box 400714, Charlottesville, Virginia 22904, USA

Received 2 July 2004; published 9 December 2004

Measurements of the polarization asymmetries Σ(θc.m.) and Σ(Eγ) of Compton scattering by 16O have been performed in the energy range of 25–40 MeV over a range of scattering angles between 90 and 150°. An analysis of the present data combined with previous results indicates that significant, narrow concentrations of E2 strength are not present below an excitation energy of 40 MeV. The existence, however, of a broad isovector giant quadrupole resonance exhausting a large percentage of the isovector energy weighted sum rule is not ruled out by the combined data. Additionally, the present data are insensitive to modifications to the free values of the nucleon polarizabilities, but cannot rule them out.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.70.064305
DOI:
10.1103/PhysRevC.70.064305
PACS:
24.30.Cz
 
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