ABSOLUTE, PROMPT GAMMA-RAY SPECTROSCOPY AND THE DETERMINATION OF FUNDAMENTAL CONSTANTS

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Abstract
There currently exists a highly accurate absolute wavelength scale for electromagnetic radiation which extends from microwaves to gamma-rays having energies less than ~ 1 MeV. This scale begins with the cesium atomic beam clock (and thus the SI meter) and continues through the iodine stabilized HeNe laser. Such a laser is then used to determine the lattice spacing of a single crystal of Si using x-ray/optical interferometry. Accurately calibrated crystals are then used in a flat crystal diffractometer to determine absolute gamma-ray wavelengths. We propose to extend this scale to the region of ~ 1-10 MeV. This requires the use of in-pile sources for the examination of prompt gamma-rays from n-γ reactions

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