Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 594, Issue 2, Pages 266-272Publisher
ELSEVIER
DOI: 10.1016/j.nima.2008.06.025
Keywords
precise beta-branching-ratio measurements; the electroweak standard model; unitarity of the Cabibbo-Kobayashi-Maskawa matrix; Monte Carlo simulations; geant4 efficiency calculation for plastic; beta-detector
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Precise beta-branching-ratio measurements are required in order to determine ft-values as part of our program to test the Electroweak Standard Model via unitarity of the Cabibbo-Kobayashi-Maskawa matrix. For the measurements to be useful in this test, their precision must be close to 0.1%. In a branching-ratio measurement, we position the radioactive sample between a thin plastic scintillator used to detect beta-particles, and a HPGe detector for gamma-rays. Both beta singles and beta-gamma coincidences are recorded. Although the branching ratio depends most strongly on the HPGe detector efficiency, it has some sensitivity to the energy dependence of the beta-detector efficiency. We report here on a study of our beta-detector response function, which used Monte Carlo calculations performed by the Geant4 toolkit. Results of the simulations are compared to measured beta-spectra from several standard P-sources. (C) 2008 Elsevier B.V. All rights reserved.
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