EPJ Web of Conferences (Jan 2016)
Conversion electrons from high-statistics β-decay measurements with the 8π spectrometer at TRIUMF-ISAC
- Garrett P. E.,
- Jigmeddorj B.,
- Radich A. J.,
- Andreoiu C.,
- Ball G. C.,
- Bangay J. C.,
- Bianco L.,
- Bildstein V.,
- Chagnon-Lessard S.,
- Cross D. S.,
- Demand G. A.,
- Diaz Varela A.,
- Dunlop R.,
- Finlay P.,
- Garnsworthy A. B.,
- Green K. L.,
- Hackman G.,
- Hadinia B.,
- Leach K. G.,
- Michetti-Wilson J.,
- Orce J. N.,
- Rajabali M. M.,
- Rand E. T.,
- Starosta K.,
- Sumithrarachchi C.,
- Svensson C. E.,
- Triambak S.,
- Wang Z. M.,
- Williams S. J.,
- Wood J. L.,
- Wong J.,
- Yates S. W.,
- Zganjar E. F.
Affiliations
- Garrett P. E.
- Department of Physics, University of Guelph
- Jigmeddorj B.
- Department of Physics, University of Guelph
- Radich A. J.
- Department of Physics, University of Guelph
- Andreoiu C.
- Department of Chemistry, Simon Fraser University
- Ball G. C.
- TRIUMF
- Bangay J. C.
- Department of Physics, University of Guelph
- Bianco L.
- Department of Physics, University of Guelph
- Bildstein V.
- Department of Physics, University of Guelph
- Chagnon-Lessard S.
- Department of Physics, University of Guelph
- Cross D. S.
- Department of Chemistry, Simon Fraser University
- Demand G. A.
- Department of Physics, University of Guelph
- Diaz Varela A.
- Department of Physics, University of Guelph
- Dunlop R.
- Department of Physics, University of Guelph
- Finlay P.
- Department of Physics, University of Guelph
- Garnsworthy A. B.
- TRIUMF
- Green K. L.
- Department of Physics, University of Guelph
- Hackman G.
- TRIUMF
- Hadinia B.
- Department of Physics, University of Guelph
- Leach K. G.
- Department of Physics, University of Guelph
- Michetti-Wilson J.
- Department of Physics, University of Guelph
- Orce J. N.
- Rajabali M. M.
- TRIUMF
- Rand E. T.
- Department of Physics, University of Guelph
- Starosta K.
- Department of Chemistry, Simon Fraser University
- Sumithrarachchi C.
- Department of Physics, University of Guelph
- Svensson C. E.
- Department of Physics, University of Guelph
- Triambak S.
- Wang Z. M.
- Williams S. J.
- TRIUMF
- Wood J. L.
- School of Physics, Georgia Institute of Technology
- Wong J.
- Department of Physics, University of Guelph
- Yates S. W.
- Departments of Chemistry and Physics & Astronomy, University of Kentucky
- Zganjar E. F.
- Department of Physics and Astronomy, Louisiana State University
- DOI
- https://doi.org/10.1051/epjconf/201612302005
- Journal volume & issue
-
Vol. 123
p. 02005
Abstract
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 124Cs decay scheme, are shown. With suffcient statistics, measurements of conversion coeffcients 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.
