Hyperfine Interactions

, Volume 223, Issue 1, pp 201-206

First online:

Decay studies for neutrino physics

Electron capture decays of 100Tc and 116In
  • A. GarcíaAffiliated withCENPA, University of Washington Email author 
  • , S. SjueAffiliated withCENPA, University of Washington
  • , E. SwansonAffiliated withCENPA, University of Washington
  • , C. WredeAffiliated withCENPA, University of WashingtonDepartment of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University
  • , D. MelconianAffiliated withTexas A&M University
  • , A. AlgoraAffiliated withInstituto de Fisica Corpuscular, University of Valencia
  • , I. AhmadAffiliated withArgonne National Laboratory

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Both 100Mo and 116Cd are zero-neutrino double-β-decay candidates with J π  = 0 +  and the ground states of the respective intermediate nuclei, 100Tc and 116In, have J π  = 1 + . This makes it possible to measure these matrix elements, which turn out to provide a valuable benchmark for testing models. The electron-capture (EC) decay of 100Tc can also be used to directly determine the efficiency of a potential neutrino detector. However, the experimental determinations of the EC decay branches of interest are challenging because they are only small fractions of the main decays and co-produced radioactivities contribute significant background counts in the regions of interest. This article summarizes our work at Jyväskylä, where we have taken advantage of the high-purity beams produced at IGISOL in combination with JYFLTRAP to achieve significant improvements in the determinations of the EC branches of 100Tc and 116In.


Neutrinos Double-beta decay Electron-capture decay Nuclear structure