Abstract
In order to measure the two-photon decay—if the one-photon decay is allowed—one has to deal with several challenging experimental problems which are discussed in this chapter. The problems of ‘direct’ and ‘sequential’ Compton scattering are outlined in Sect. 3.1 and a detector arrangement is presented which suppresses both unwanted effects. Since the rate of the two-photon decay amounts to a few events per day and detector pair only, it is important to investigate the background which is present even without a 137Cs source. In Sect. 3.2 it is shown, that the ratio of the background rate to the expected two-photon rate is sufficiently small to perform the experiment. A method to further suppress this background is presented. In Sect. 3.3 the problem of time random coincidences and implications for the choice of the source strength and for the distance from detector to source are discussed. In the last section of this chapter the general data taking conditions and the electronic setup are presented.
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Walz, C. (2016). Experimental Setup of the Two-Photon Decay Experiment. In: The Two-Photon Decay of the 11-/2 Isomer of 137Ba and Mixed-Symmetry States of 92,94Zr and 94Mo. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-27183-5_3
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DOI: https://doi.org/10.1007/978-3-319-27183-5_3
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