Q Value of In115→Sn115(3/2+): The Lowest Known Energy β Decay

Brianna J. Mount, Matthew Redshaw, Edmund G. Myers

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Abstract

Using precision, cryogenic, Penning-trap mass spectrometry we have measured the atomic mass difference M[In115]-M[Sn115] to be 497.489(10)keV/c2. Combined with the energy of the 3/2+ first excited state of Sn115, the Q value of the In115(9/2+)→Sn115(3/2+) beta decay is determined to be 155(24) eV. This confirms the inference of Cattadori that this small branching-ratio beta decay has the lowest-known Q value. We also report improved values of the individual atomic masses: M[In115]=114.903878774(16)u and M[Sn115]=114.903344697(17)u.

Original languageEnglish
Article number122502
JournalPhysical Review Letters
Volume103
Issue number12
DOIs
StatePublished - Sep 16 2009

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