Conversion-electron spectroscopy and gamma-gamma angular correlation measurements in 116Sn

D. S. Cross; J. L. Pore; C. Andreoiu; G. C. Ball; P. C. Bender; A. S. Chester; R. Churchman; G. A. Demand; A. Diaz Varela; R. Dunlop; A. B. Garnsworthy; P. E. Garrett; G. Hackman; B. Hadinia; B. Jigmeddorj; A. T. Laffoley; A. Liblong; R. Kanungo; D. T. Miller; B. Noakes; C. M. Petrache; K. Starosta; C. E. Svensson; P. Voss; Z-M. Wang; J. M. Wilson; J. L. Wood; S. W. Yates

doi:10.1140/epja/i2017-12412-5

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Hadrons and Nuclei

Eur. Phys. J. A (2017) 53: 216
https://doi.org/10.1140/epja/i2017-12412-5

Regular Article - Experimental Physics

Conversion-electron spectroscopy and gamma-gamma angular correlation measurements in ¹¹⁶Sn

D. S. Cross¹^*, J. L. Pore¹, C. Andreoiu¹, G. C. Ball², P. C. Bender², A. S. Chester¹, R. Churchman², G. A. Demand³, A. Diaz Varela³, R. Dunlop³, A. B. Garnsworthy², P. E. Garrett³, G. Hackman², B. Hadinia³, B. Jigmeddorj³, A. T. Laffoley³, A. Liblong³, R. Kanungo⁴, D. T. Miller², B. Noakes¹, C. M. Petrache⁵, K. Starosta¹, C. E. Svensson³, P. Voss¹, Z-M. Wang¹^,2, J. M. Wilson³, J. L. Wood⁶ and S. W. Yates⁷

¹ Department of Chemistry, Simon Fraser University, 8888 University Drive, V5A 1S6, Burnaby, BC, Canada
² TRIUMF, 4004 Wesbrook Mall, V6T 2A3, Vancouver, BC, Canada
³ Department of Physics, University of Guelph, 50 Stone Road E., N1G 2W1, Guelph, ON, Canada
⁴ Department of Astronomy and Physics, Saint Mary’s University, 923 Robie Street, B3H 3C3, Halifax, NS, Canada
⁵ CSNSM, CNRS-IN2P3, Université Paris-Saclay, 91405, Orsay Cedex, France
⁶ School of Physics, Georgia Institute of Technology, 837 State Street, 30332-0430, Atlanta, GA, USA
⁷ Departments of Chemistry and Physics & Astronomy, University of Kentucky, 40506-0055, Lexington, KY, USA

^* e-mail: dcrossa@sfu.ca

Received: 28 August 2017
Accepted: 9 October 2017
Published online: 20 November 2017

Abstract

The ¹¹⁶Sn nucleus was studied via the $\beta^{-}$ decay of ¹¹⁶In utilizing the $8\pi$ spectrometer and its auxiliary detectors at TRIUMF-ISAC. The resulting K-shell conversion coefficients, K/L ratios, and multipole mixing ratios are presented. The $2_{3}^{+} \rightarrow 2_{1}^{+} 931$ keV and $2_{2}^{+} \rightarrow 2_{1}^{+} 819$ keV transition mixing ratios were re-measured and found to be $\delta = +1.8_{-0.5}^{+0.7}$ and $ -1.83(8)$ , respectively. Newly measured mixing ratios for transitions among the low-lying $I^{\pi} = 4^{+}$ states in ¹¹⁶Sn, when combined with $\gamma$ -ray intensity data, suggest that the 2529 keV $4_{2}^{+}$ state possesses a neutron broken-pair admixture in addition to its dominant proton 2p-2h component.