Sprecher
Beschreibung
Electron-ion collision spectroscopy is a very successful approach for studying the properties of highly-charged ions [1], in particular if low-energy dielectronic recombination (DR) resonances are scrutinized. The heavy-ion storage ring CRYRING@ESR at the international FAIR facility in Darmstadt, Germany, is especially attractive for dielectronic recombination studies, since it is equipped with an electron cooler that provides an ultra-cold electron beam promising highest experimental resolving power and precision [2–4]. Thanks to its high precision, DR spectroscopy of excitation energies at the CRYRING@ESR will allow us to sensitively probe higher order contributions to state-of-the-art quantum-electrodynamical (QED) calculations in strong fields [5, 6].
We will report on some preliminary DR results of berylliumlike gold ions, which were injected into the CRYRING (∼ $5 · 10^6$ ions/cycle, with an energy of 12 MeV/u) from the full chain of GSI accelerators consisting of the linear accelerator UNILAC, the heavy-ion synchrotron SIS18, and the high-energy storage ring ESR. The recorded DR spectra in the collision-energy range 0-300 eV exhibit a number of Rydberg resonances which are associated with different excitations of the Be- like ion core. Preliminary analysis of a few partial energy intervals will be presented in form of a poster during the SPARC workshop.
References:
[1] Schippers S et al. 2015 Nucl. Instrum. Methods Phys. 350 61
[2] Fogle M et al. 2003 J. Phys. B 36 2563
[3] Lestinsky M et al. 2016 Eur. Phys. J. ST 225 797
[4] Brandau C et al. 2025 Chin. Phys. C 49 064001
[5] Malyshev A et al. 2025 Phys. Rev. A 110 062824
[6] Schippers S et al. submitted (see also https://arxiv.org/abs/2502.15433)
