Elastic Compton scattering from the deuteron and nucleon polarizabilities

Physics – Nuclear Physics – Nuclear Experiment

Scientific paper

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4 pages, 3 figures, accepted in Physical Review Letters; final version, discussion slightly modified, reference added

Scientific paper

10.1103/PhysRevLett.84.2334

Cross sections for elastic Compton scattering from the deuteron were measured over the laboratory angles 35-150 deg. Tagged photons in the laboratory energy range 84-105 MeV were scattered from liquid deuterium and detected in the large-volume Boston University NaI (BUNI) spectrometer. Using the calculations of Levchuk and L'vov, along with the measured differential cross sections, the isospin-averaged nucleon polarizabilities in the deuteron were estimated. A best-fit value of (alpha-beta) = 2.6+/-1.8 was determined, constrained by dispersion sum rules. This is markedly different from the accepted value for the proton of (alpha-beta) = 10.0+/-1.5+/-0.9.

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