High-Precision Q -Value Measurement Confirms the Potential of Cs135 for Absolute Antineutrino Mass Scale Determination

The ground-state-to-ground-state \betadecay Qvalue of ^{135}\textrm{Cs}(7/2^+)\to\,^{135}\textrm{Ba}(3/2^+)was directly measured for the first time utilizing the Phase-Imaging Ion-Cyclotron Resonance (PI-ICR) technique at the JYFLTRAP Penning-trap setup. It is the first direct determination of this Qvalue and its value of 268.66(30)\,keV is a factor of three more precise than the currently adopted Qvalue in the Atomic Mass...