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Abstract:We report on the first experimental demonstration of Compton imaging of gamma rays with a single coaxial high-purity germanium (HPGe) detector. This imaging capability is realized by two-dimensional segmentation of the outside contact in combination with digital pulse-shape analysis, which enables to image gamma rays in 4p without employing a collimator. We are able to demonstrate the ability to image the 662keV gamma ray from a 137 Cs source with preliminary event selection with an angular accuracy of 5 degree with an relative efficiency of 0.2%. In addition to the 4p imaging capability, such a system is characterized by its excellent energy resolution and can be implemented in any size possible for Ge detectors to achieve high efficiency.

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The cross-section ratio for H(d, y)'He relative to H(d, a)n has been measured at an effective deuteron bombarding energy of 100 keV with a NaI pair spectrometer and a tritiated-titanium target. The ratio was determined to be (1.2+0.3) X 10 by comparing the spectra and count rates for H(d, y)'He and H(d, a)n with H( He, y )'Li and H( He, e)'H.