Fundamental physics using ultrahigh resolution gamma spectroscopy

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Abstract

GAMS4, a double-flat-crystal spectrometer, is operated as a joint NIST/ILL facility at the High Flux Reactor at the Institut Laue-Langevin (ILL) in Grenoble, France. It was designed and has been used successfully for the absolute determination of gamma-ray energies in the region <5 MeV. Such measurements can lead to a unification of the atomic mass scale and the wavelength scale. Recently, new directions of research that exploit details of measured line shapes have been identified. We discuss the status of the absolute wavelength program and these new programs.

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