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The double-beta decay Q values of 130Te, 128Te, and 120Te have beendetermined from parent-daughter mass differences measured with the CanadianPenning Trap mass spectrometer. The 132Xe-129Xe mass difference, which isprecisely known, was also determined to confirm the accuracy of these results.The 130Te Q value was found to be 2527.01(32) keV which is 3.3 keV lower thanthe 2003 Atomic Mass Evaluation recommended value, but in agreement with themost precise previous measurement. The uncertainty has been reduced by a factorof 6 and is now significantly smaller than the resolution achieved or foreseenin experimental searches for neutrinoless double-beta decay. The 128Te and120Te Q values were found to be 865.87(131) keV and 1714.81(125) keV,respectively. For 120Te, this reduction in uncertainty of nearly a factor of 8opens up the possibility of using this isotope for sensitive searches forneutrinoless double-electron capture and electron capture with positronemission.

Double-beta decay Q values of 130Te, 128Te, and 120Te