Q_EC values of the Superallowed beta-Emitters 10-C, 34-Ar, 38-Ca and   46-V
  The Q_EC values of the superallowed beta+ emitters 10-C, 34-Ar, 38-Ca and 46-V have been measured with a Penning-trap mass spectrometer to be 3648.12(8), 6061.83(8), 6612.12(7) and 7052.44(10) keV, respectively. All four values are substantially improved in precision over previous results. 
T. Eronen, D. Gorelov, J. Hakala, J. C. Hardy, A. Jokinen, A.   Kankainen, I. D. Moore, H. Penttila, M. Reponen, J. Rissanen...
nucl-ex