Kellerbauer A, Audi G, Beck D, Blaum K, Bollen G, Brown B A, Delahaye P, Guénaut C, Herfurth F, Kluge H-J, Lunney D, Schwarz S, Schweikhard L, Yazidjian C
Department of Physics, CERN, 1211 Genève 23, Switzerland.
Phys Rev Lett. 2004 Aug 13;93(7):072502. doi: 10.1103/PhysRevLett.93.072502. Epub 2004 Aug 12.
The decay energy of the superallowed beta decay 74Rb(beta+)74Kr was determined by direct Penning trap mass measurements on both the mother and the daughter nuclide using the time-of-flight resonance technique and was found to be Q=10 416.8(4.5) keV. The exotic nuclide 74Rb, with a half-life of only 65 ms, is the shortest-lived nuclide on which a high-precision mass measurement in a Penning trap has been carried out. Together with existing data for the partial half-life as well as theoretical corrections, the decay energy yields a comparative half-life of Ft=3084(15) s for this decay, in agreement with the mean value for the series of the lighter nuclides from 10C to 54Co. Assuming conserved vector current, this result allows for an experimental determination of the isospin-symmetry-breaking correction deltaC.
通过使用飞行时间共振技术对母核素和子核素进行直接潘宁阱质量测量，确定了超允许β衰变(^{74}Rb(\beta^+)^{74}Kr)的衰变能量，结果为(Q = 10416.8(4.5))keV。奇异核素(^{74}Rb)的半衰期仅为65毫秒，是在潘宁阱中进行高精度质量测量的寿命最短的核素。结合部分半衰期的现有数据以及理论修正，衰变能量得出该衰变的比较半衰期(Ft = 3084(15))秒，与从(^{10}C)到(^{54}Co)的较轻核素系列的平均值一致。假设矢量流守恒，该结果允许通过实验确定同位旋对称性破缺修正(\delta C)。
