Near-threshold deuteron photodisintegration: An indirect determination of the Gerasimov-Drell-Hearn sum rule and forward spin polarizability (γ0) for the deuteron at low energies

M. W. Ahmed, M. A. Blackston, B. A. Perdue, W. Tornow, H. R. Weller, B. Norum, B. Sawatzky, R. M. Prior, and M. C. Spraker
Phys. Rev. C 77, 044005 – Published 24 April 2008

Abstract

It is shown that a measurement of the analyzing power obtained with linearly polarized γ-rays and an unpolarized target can provide an indirect determination of two physical quantities. These are the Gerasimov-Drell-Hearn (GDH) sum rule integrand for the deuteron and the sum rule integrand for the forward spin polarizability (γ0) near photodisintegration threshold. An analysis of data for the d(γ,n)p reaction and other experiments is presented. A fit to the world data analyzed in this manner gives a GDH integral value of 603±43μb between the photodisintegration threshold and 6 MeV. This result is the first confirmation of the large contribution of the 1S0(M1) transition predicted for the deuteron near photodisintegration threshold. In addition, a sum rule value of 3.75±0.18 fm4 for γ0 is obtained between photodisintegration threshold and 6 MeV. This is a first indirect confirmation of the leading-order effective field theory prediction for the forward spin-polarizability of the deuteron.

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  • Received 23 July 2007

DOI:https://doi.org/10.1103/PhysRevC.77.044005

©2008 American Physical Society

Authors & Affiliations

M. W. Ahmed*, M. A. Blackston, B. A. Perdue, W. Tornow, and H. R. Weller

  • Department of Physics, Duke University, Durham, North Carolina 27708, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-90308, USA

B. Norum and B. Sawatzky

  • Department of Physics, University of Virginia, 382 McCormick Road, P. O. Box 400714, Charlottesville, Virginia 22904, USA

R. M. Prior and M. C. Spraker

  • North Georgia College & State University, Dahlonega, Georgia 30597, USA

  • *Corresponding author. mohammad.ahmed@duke.edu

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Issue

Vol. 77, Iss. 4 — April 2008

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