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Use of Energy Summing for Selection of Coincidence Events in Positron-Lifetime Spectroscopy

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Bec̆vár̆ F., C̆iz̆ek J., Procházka I.

Acta Physica Polonica A

1999

vol. 95

issue 4

448-454

A BaF_{2} 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 ^{22}Na) 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.

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1 Acta Physica Polonica A

1 1999

1 Bec̆vár̆ F.

1 C̆iz̆ek J.

1 Procházka I.

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Use of Energy Summing for Selection of Coincidence Events in Positron-Lifetime Spectroscopy