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.

Document Type


Publication Date


Notes/Citation Information

Published in Journal of Physics: Conference Series, v. 639, conference 1, article 012006, p. 1-15.

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Published under licence by IOP Publishing Ltd.

Due to the large number of authors involved, only the first 10 and the ones affiliated with the University of Kentucky are listed in the author section above. For the complete list of authors, please download this article or visit the following link: http://dx.doi.org/10.1088/1742-6596/639/1/012006

Digital Object Identifier (DOI)


Funding Information

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.

Related Content

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

Included in

Chemistry Commons