High Precision Determination of the beta Decay Q(EC) Value of C-11 and Implications on the Tests of the Standard Model

作者：Gulyuz K^*; Bollen G; Brodeur M; Bryce R A; Cooper K; Eibach M; Izzo C; Kwan E; Manukyan K; Morrissey D J; Naviliat Cuncic O; Redshaw M; Ringle R; Sandler R; Schwarz S; Sumithrarachchi C S; Valverde A A; Villari A C C

来源：Physical Review Letters, 2016, 116(1): 012501.

DOI：10.1103/PhysRevLett.116.012501

We report the determination of the Q(EC) value of the mirror transition of C-11 by measuring the atomic masses of C-11 and B-11 using Penning trap mass spectrometry. More than an order of magnitude improvement in precision is achieved as compared to the 2012 Atomic Mass Evaluation (AME2012) [ Chin. Phys. C 36, 1603 (2012)]. This leads to a factor of 3 improvement in the calculated Ft value. Using the new value, Q(EC) = 1981.690(61) keV, the uncertainty on Ft is no longer dominated by the uncertainty on the Q(EC) value. Based on this measurement, we provide an updated estimate of the Gamow-Teller to Fermi mixing ratio and standard model values of the correlation coefficients.

• 出版日期2016-1-6