Use of Energy Summing for Selection of Coincidence Events in Positron-Lifetime Spectroscopy |
| F. Bec̆vár̆, J. C̆iz̆ek and I. Procházka Department of Low-Temperature Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, The Czech Republic |
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| A BaF2 positron-lifetime spectrometer equipped with a coincidence system that represents a compromise between the traditional fast-fast and fast-slow arrangements is described. The main difference of the present configuration from both the fast-slow and fast-fast ones consists in use of a sum of the energy signals from the start and stop detectors to select the coincidence events. Quality of the spectrometer response function (≈ 150 ps FWHM for 22Na) is very close to that observed for our fast-slow configuration with the equivalent detectors but throughput of the present apparatus is increased almost by a factor of two. Moreover, the electronic scheme becomes less complicated, which has also a positive impact on its cost. |
| DOI: 10.12693/APhysPolA.95.448 PACS numbers: 78.70.Bj |