First direct determination of the 48Ca double-β decay Q value

S. Bustabad, G. Bollen, M. Brodeur, D. L. Lincoln, S. J. Novario, M. Redshaw, R. Ringle, S. Schwarz, A. A. Valverde

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The low-energy beam and ion trap Penning trap mass spectrometer was used for an improved determination of the 48Ca double-β decay Q value: Q ββ=4268.121(79)keV. The new value is 1.2 keV greater than the value in the 2012 atomic mass evaluation, a shift of three σ, and is a factor of 5 more precise. Accurate knowledge of this Q value is important for experimental searches to observe neutrinoless double-β decay (0νββ) in 48Ca and is essential for extracting the effective mass of the electron neutrino if the 48Ca half-life of 0νββ was experimentally determined.

Original languageEnglish
Article number022501
JournalPhysical Review C - Nuclear Physics
Issue number2
StatePublished - Aug 7 2013


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