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Phys Rev Lett. 2011 Dec 30;107(27):272501. doi: 10.1103/PhysRevLett.107.272501. Epub 2011 Dec 29.
Penning trap mass measurements of short-lived nuclides have been performed for the first time with highly charged ions, using the TITAN facility at TRIUMF. Compared to singly charged ions, this provides an improvement in experimental precision that scales with the charge state q. Neutron-deficient Rb isotopes have been charge bred in an electron beam ion trap to q=8-12+ prior to injection into the Penning trap. In combination with the Ramsey excitation scheme, this unique setup creating low energy, highly charged ions at a radioactive beam facility opens the door to unrivaled precision with gains of 1-2 orders of magnitude. The method is particularly suited for short-lived nuclides such as the superallowed β emitter 74Rb (T(1/2)=65 ms). The determination of its atomic mass and an improved Q(EC) value are presented.
首次使用 TRIUMF 的 TITAN 设施，通过采用高电荷态离子完成了对短寿命核素的潘宁陷阱质量测量。与单电荷离子相比，这提供了一种与电荷态 q 成比例的实验精度改进。在将其注入潘宁陷阱之前，通过电子束离子阱将中子亏损的 Rb 同位素电荷培养至 q=8-12+。与拉姆齐激发方案相结合，这种在放射性束设施中创建低能、高电荷态离子的独特设置为实现无与伦比的精度开辟了道路，增益高达 1-2 个数量级。该方法特别适用于短寿命核素，如超允许β发射体 74Rb（T(1/2)=65 ms）。本文呈现了对其原子质量和改进的 Q(EC)值的测定。
