Degeneracy at 1871 keV in $^{112}\mathrm{Cd}$ and implications for neutrinoless double electron capture

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Degeneracy at 1871 keV in ${}^{112}{Cd}$ and implications for neutrinoless double electron capture

K. L. Green, P. E. Garrett, R. A. E. Austin, G. C. Ball, D. S. Bandyopadhyay, S. Colosimo, D. Cross, G. A. Demand, G. F. Grinyer, G. Hackman, W. D. Kulp, K. G. Leach, A. C. Morton, C. J. Pearson, A. A. Phillips, M. A. Schumaker, C. E. Svensson, J. Wong, J. L. Wood, and S. W. Yates

Phys. Rev. C 80, 032502(R) – Published 9 September 2009

Abstract

High-statistics $β$ -decay measurements of ${}^{112}{Ag}$ and ${}^{112}{In}$ were performed to study the structure of the ${}^{112}{Cd}$ nucleus. The precise energies of the doublet of levels at 1871 keV, for which the $0^{+}$ member has been suggested as a possible daughter state following neutrinoless double electron capture of ${}^{112}{Sn}$ , were determined to be 1871.137(72) keV ( $0_{4}^{+}$ level) and 1870.743(54) keV ( $4_{2}^{+}$ level). The nature of the $0_{4}^{+}$ level, required for the calculation of the nuclear matrix element that would be needed to extract a neutrino mass from neutrinoless double electron capture to this state, is suggested to be of intruder origin.

Received 22 July 2009

DOI:https://doi.org/10.1103/PhysRevC.80.032502

Authors & Affiliations

K. L. Green^1,*, P. E. Garrett¹, R. A. E. Austin², G. C. Ball³, D. S. Bandyopadhyay³, S. Colosimo^2,†, D. Cross⁴, G. A. Demand^1,‡, G. F. Grinyer^1,§, G. Hackman³, W. D. Kulp⁵, K. G. Leach¹, A. C. Morton³, C. J. Pearson³, A. A. Phillips¹, M. A. Schumaker^1,∥, C. E. Svensson¹, J. Wong¹, J. L. Wood⁵, and S. W. Yates⁶

¹Department of Physics, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
²Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada
³TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
⁴Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada
⁵School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA
⁶Departments of Chemistry and Physics & Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055, USA

^*kgreen01@physics.uoguelph.ca
^†Present address: Department of Physics, University of Liverpool, Liverpool, L69 7ZE, UK.
^‡Department of Physics, Engineering Physics, and Astronomy, Queen's University, Kingston, Ontario, K7L 3N6, Canada.
^§Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
^∥Present address: Department of Physics, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada.

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Vol. 80, Iss. 3 — September 2009

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Physical Review C

covering nuclear physics

Degeneracy at 1871 keV in ${}^{112}{Cd}$ and implications for neutrinoless double electron capture

K. L. Green, P. E. Garrett, R. A. E. Austin, G. C. Ball, D. S. Bandyopadhyay, S. Colosimo, D. Cross, G. A. Demand, G. F. Grinyer, G. Hackman, W. D. Kulp, K. G. Leach, A. C. Morton, C. J. Pearson, A. A. Phillips, M. A. Schumaker, C. E. Svensson, J. Wong, J. L. Wood, and S. W. Yates

Phys. Rev. C 80, 032502(R) – Published 9 September 2009

Abstract

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Physical Review C

covering nuclear physics

Degeneracy at 1871 keV in Cd112 and implications for neutrinoless double electron capture

K. L. Green, P. E. Garrett, R. A. E. Austin, G. C. Ball, D. S. Bandyopadhyay, S. Colosimo, D. Cross, G. A. Demand, G. F. Grinyer, G. Hackman, W. D. Kulp, K. G. Leach, A. C. Morton, C. J. Pearson, A. A. Phillips, M. A. Schumaker, C. E. Svensson, J. Wong, J. L. Wood, and S. W. Yates

Phys. Rev. C 80, 032502(R) – Published 9 September 2009

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Degeneracy at 1871 keV in ${}^{112}{Cd}$ and implications for neutrinoless double electron capture