Gamma-ray Energies Measured with Ge(Li) Spectrometer
In this paper, we discuss the capability of Ge(Li) spectrometers for the precise determination of gamma-ray energies. Of special interest here is the consideration of the problems, and the precision attainable, for gamma rays with energies of a few MeV. Previously, the energies of some gamma-ray transitions and nuclear levels from the (n,γ) reaction have been reported by one of the authors (1). These energies extend up to ~ 11 MeV with uncertainties of ~ 0.5 keV. Some of these energies were determined by summing the energies of the cascade gamma rays. Also in many cases the gamma-ray energies were measured by comparing a double-escape (DE) peak with nearby full-energy (FE) peaks. In the course of these experiments, it became clear that any further improvement in these energy measurements would have to be preceded by a systematic review and analysis of the assumptions involved and an improvement in the calibration energies available below 3 MeV.
KeywordsEnergy Scale Calibration Line Fundamental Constant Small Energy Difference Annihilation Line
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