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High-precision mass-ratio measurements with relative uncertainties below 10-11 have applications, among others, in tests of the theory of special relativity (SRT) [1], bound-state QED [2] and neutrino physics research [3, 4]. This precision can be reached using Penning trap mass spectrometry, where mass measurements are performed by determining the free cyclotron frequency in a strong magnetic field.
With the first proof-of-principle mass-ratio measurements of xenon isotopes the high-precision Penning-trap mass spectrometer Pentatrap [5], located at the Max-Planck-Institut für Kernphysik in Heidelberg, has demonstrated a relative mass-ratio precision of ~3×10-11 using highly-charged xenon ions [6] and has discovered metastable electronic states in highly-charged ions of rhenium [7]. A unique feature of the experimental setup is the stack of five cylindrical Penning traps [8] allowing the simultaneous storage and measurement of several ion species and thereby reducing systematic errors. Long storage times due to a cryogenic environment and dedicated image current detection systems [9] with single ion sensitivity allow a high-precision determination of the cyclotron frequencies in all traps.
The experimental setup of Pentatrap and the recent modifications for the measurement of the holmium electron capture Q-value for neutrino physics [3, 4] will be presented in the talk.
[1] S. Rainville et al., Nature 483, 1096 (2005).
[2] F. Köhler-Langes et al., Nature Comm. 7, 10246 (2016).
[3] S. Eliseev et al., Ann. Phys. 525, 707 (2013).
[4] L. Gastaldo et al., Eur. Phys. J. ST 226, 1623 (2017).
[5] J. Repp et al., Appl. Phys. B107, 983 (2012).
[6] A. Rischka, et al., PRL 124, 113001 (2020).
[7] R. X. Schüssler, et al., Nature 581, 42 (2020)
[8] C. Roux et al., Appl. Phys. B108, 997 (2012).
[9] H. Nagahama, et al., Rev. Sci. Instr. 87, 113305 (2016).