Conversion electrons from high-statistics β-decay measurements with the 8π spectrometer at TRIUMF-ISAC

P. E. Garrett, B. Jigmeddorj, A. J. Radich, C. Andreoiu, G. C. Ball, J. C. Bangay, L. Bianco, V. Bildstein, S. Chagnon-Lessard, D. S. Cross, G. A. Demand, A. Diaz Varela, R. Dunlop, P. Finlay, A. B. Garnsworthy, K. L. Green, G. Hackman, B. Hadinia, K. G. Leach, J. Michetti-WilsonJ. N. Orce, M. M. Rajabali, E. T. Rand, K. Starosta, C. Sumithrarachchi, C. E. Svensson, S. Triambak, Z. M. Wang, S. J. Williams, J. L. Wood, J. Wong, S. W. Yates, E. F. Zganjar

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


The 8π spectrometer, located at TRIUMF-ISAC, was the world's most powerful spectrometer dedicated to β-decay studies until its decommissioning in early 2014 for replacement with the GRIFFIN array. An integral part of the 8π spectrometer was the Pentagonal Array for Conversion Electron Spectroscopy (PACES) consisting of 5 Si(Li) detectors used for charged-particle detection. PACES enabled both γ - e- and e- - e- coincidence measurements, which were crucial for increasing the sensitivity for discrete e- lines in the presence of large backgrounds. Examples from a 124Cs decay experiment, where the data were vital for the expansion of the 124Csm decay scheme, are shown. With sufficient statistics, measurements of conversion coefficients can be used to extract the E0 components of Jπ → Jπ transitions for J ≠ 0, which is demonstrated for data obtained in 110In→110Cd decay. With knowledge of the shapes of the states involved, as obtained, for example, from the use of Kumar-Cline shape invariants, the mixing of the states can be extracted.

Original languageEnglish
Article number02005
JournalEPJ Web of Conferences
StatePublished - Sep 5 2016
Event2015 Heavy Ion Accelerator Symposium, HIAS 2015 - Canberra, Australia
Duration: Sep 14 2015Sep 18 2015

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© The Authors, published by EDP Sciences.

ASJC Scopus subject areas

  • General Physics and Astronomy


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