The 8π spectrometer, installed at the TRIUMF-ISAC facility, was the world's most sensitive γ-ray spectrometer dedicated to β-decay studies. A description is given of the 8π spectrometer and its auxiliary detectors including the plastic scintillator array SCEPTAR used for β-particle tagging and the Si(Li) array PACES for conversion electron measurements, its moving tape collector, and its data acquisition system. The recent investigation of the decay of 124Cs to study the nuclear structure of 124Xe, and how the β-decay measurements complemented previous Coulomb excitation studies, is highlighted, including the extraction of the deformation parameters for the excited 0+ bands in 124Xe. As a by-product, the decay scheme of the (7+) 124Cs isomeric state, for which the data from the PACES detectors were vital, was studied. Finally, a description of the new GRIFFIN spectrometer, which uses the same auxiliary detectors as the 8π spectrometer, is given.
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This work was supported in part by the Natural Sciences and Engineering Research Council (Canada), TRIUMF through the National Research Council (Canada), and by the U.S. National Science Foundation under Grant No. PHY-1305801. Funding for GRIFFIN was provided by the Canadian Foundation for Innovation, TRIUMF, and the University of Guelph.
This paper was a part of the XXXVIII Symposium on Nuclear Physics (Cocoyoc 2015), January 6-9, in Cocoyoc, Mexico. More papers and information from this conference are available at: http://iopscience.iop.org/issue/1742-6596/639/1
Yates, Steven W.; Garrett, P. E.; Radich, A. J.; Allmond, J. M.; Andreoiu, C.; Ball, G. C.; Bender, P. C.; Bianco, L.; Bildstein, V.; Bidaman, H.; and Braid, R., "Far From 'Easy' Spectroscopy with the 8π and GRIFFIN Spectrometers at TRIUMF-ISAC" (2015). Chemistry Faculty Publications. 60.