Pulse Saturation Effects In Cosmic Ray Vetoing

Physics

Scientific paper

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Background Radiations, X- And Gamma-Ray Spectroscopy

Scientific paper

The anticosmic veto system developed around the extended range HPGe detector is described. In order to maximize the vetoing effect in the low-energy Ge spectrum region, the Ge fast output was amplified and the subsequent CFD threshold was set above background (~20 keV). The timing curve derived with this setup exhibited unusual features. Two peaks appeared at the distance of the 125 ns. The second peak appeared to be ``prompt'' on the position where the coincidence events from positron annihilation (22Na) occur. The apparently superluminal nature of the first peak is discussed in terms of saturation of the spectrum in the fast amplifier.

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