Lennarz A, Grossheim A, Leach K G, Alanssari M, Brunner T, Chaudhuri A, Chowdhury U, Crespo López-Urrutia J R, Gallant A T, Holl M, Kwiatkowski A A, Lassen J, Macdonald T D, Schultz B E, Seeraji S, Simon M C, Andreoiu C, Dilling J, Frekers D
Institut für Kernphysik, Westfälische Wilhelms-Universität, 48149 Münster, Germany and TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.
TRIUMF, Vancouver, British Columbia V6T 2A3, Canada and Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.
Phys Rev Lett. 2014 Aug 22;113(8):082502. doi: 10.1103/PhysRevLett.113.082502. Epub 2014 Aug 21.
In this Letter, we introduce the concept of in-trap nuclear decay spectroscopy of highly charged radioactive ions and describe its successful application as a novel spectroscopic tool. This is demonstrated by a measurement of the decay properties of radioactive mass A=124 ions (here, ^{124}In and ^{124}Cs) in the electron-beam ion trap of the TITAN facility at TRIUMF. By subjecting the trapped ions to an intense electron beam, the ions are charge bred to high charge states (i.e., equivalent to the removal of N-shell electrons), and an increase of storage times to the level of minutes without significant ion losses is achieved. The present technique opens the venue for precision spectroscopy of low branching ratios and is being developed in the context of measuring electron-capture branching ratios needed for determining the nuclear ground-state properties of the intermediate odd-odd nuclei in double-beta (ββ) decay.
在本信函中，我们介绍了高电荷放射性离子的核内衰变光谱学概念，并描述了其作为一种新型光谱工具的成功应用。这通过在加拿大粒子与核物理国家实验室（TRIUMF）的TITAN设施的电子束离子阱中测量放射性质量数A = 124离子（此处为(^{124}In)和(^{124}Cs)）的衰变特性得以证明。通过使捕获的离子受到强电子束作用，离子被电荷增殖至高电荷态（即相当于去除N壳层电子），并实现了存储时间增加到分钟量级且无明显离子损失。当前技术为低分支比的精密光谱学开辟了道路，并且正在双β（ββ）衰变中确定中间奇奇核的核基态性质所需的电子俘获分支比测量的背景下进行开发。
