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Digital beta counting and pulse-shape analysis for high-precision nuclear beta decay half-life measurements: Tested on Al m 26

2013; Elsevier BV; Volume: 728; Linguagem: Inglês

10.1016/j.nima.2013.06.039

1872-9576

Lie-Wen Chen, J. C. Hardy, M. Bencomo, V. Horvat, N. Nica, Hyungil Park,

Atomic and Subatomic Physics Research

Abstract A digital β - counting method has been developed for high-precision nuclear β - decay half-life experiments that use a gas proportional counter. An 8-bit, 1-GS/s sampling-rate digitizer was used to record the waveforms from the detector and a software filter was designed, tested and applied successfully to discriminate genuine β - decay events from spurious signals by pulse-shape analysis. The method of using a high-speed digitizer for precision β counting is described in detail. We have extensively tested the digitizer and the off-line filter by analyzing saved waveforms from the decay of Al m 26 acquired at rates up to 10,000 per second. The half-life we obtain for Al m 26 is 6345.30±0.90 ms, which agrees well with previous published measurements and is as precise as the best of them. This work demonstrates the feasibility of applying a high-speed digitizer and off-line digital signal processing techniques for high-precision nuclear β - decay half-life measurements.