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 () near photodisintegration threshold. An analysis of data for the reaction and other experiments is presented. A fit to the world data analyzed in this manner gives a GDH integral value of b between the photodisintegration threshold and 6 MeV. This result is the first confirmation of the large contribution of the transition predicted for the deuteron near photodisintegration threshold. In addition, a sum rule value of 3.75±0.18 fm for 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.
- Received 23 July 2007
DOI:https://doi.org/10.1103/PhysRevC.77.044005
©2008 American Physical Society