Eronen T, Elomaa V, Hager U, Hakala J, Jokinen A, Kankainen A, Moore I, Penttilä H, Rahaman S, Rissanen J, Saastamoinen A, Sonoda T, Aystö J, Hardy J C, Kolhinen V S
Department of Physics, University of Jyväskylä, P.O. Box 35 (YFL), FIN-40014, Finland.
Phys Rev Lett. 2006 Dec 8;97(23):232501. doi: 10.1103/PhysRevLett.97.232501.
The beta-decay Q(EC) values of the superallowed beta emitters 26Alm, 42Sc, and 46V have been measured with a Penning trap to a relative precision of better than 8 x 10(-9). Our result for 46V, 7052.72(31) keV, confirms a recent measurement that differed from the previously accepted reaction-based Q(EC) value. However, our results for 26Alm and 42Sc, 4232.83(13) keV and 6426.13(21) keV, are consistent with previous reaction-based values. By eliminating the possibility of a systematic difference between the two techniques, this result demonstrates that no significant shift in the deduced value of Vud should be anticipated.
利用潘宁阱测量了超允许β发射体26Alm、42Sc和46V的β衰变Q(EC)值，相对精度优于8×10⁻⁹。我们得到的46V的结果为7052.72(31)keV，证实了最近一项与先前基于反应的Q(EC)值不同的测量。然而，我们得到的26Alm和42Sc的结果，分别为4232.83(13)keV和6426.13(21)keV，与先前基于反应的值一致。通过消除两种技术之间存在系统差异的可能性，这一结果表明不应预期Vud的推导值会有显著偏移。
