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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Focus Session I: New Results on Nuclear Structure at Shell Closures
HK 13.1: Invited Talk
Tuesday, March 12, 2024, 14:00–14:30, HBR 14: HS 1
First laser spectroscopy measurements of 53Ca and the prospects for measuring 54Ca — •Tim Lellinger for the COLLAPS collaboration — EP-SME-IS, CERN — TU-Darmstadt
Over a decade ago, the first experimental evidence for the N=32 sub shell closure in the calcium isotopic chain emerged [1,2]. Subsequent experimental and theoretical investigations have confirmed this finding. However, in laser spectroscopy measurements extending up to 52Ca (N=32), no indications of this shell gap were apparent [3]. Crossing the shell gap with laser spectroscopy setups has proved difficult due to the simultaneous requirement of a sensitivity of approximately 10 ions/s and a measurement uncertainty on the order of MHz.
This contribution presents the first laser spectroscopy measurements of 53Ca, facilitated by an extension of the collinear laser spectroscopy technique employed at the COLLAPS setup at ISOLDE/CERN. This technique, termed as radioactive detection after optical pumping and state selective charge exchange (ROC), combines the high sensitivity of a particle detection scheme with the high resolution of low-power, continuous wave lasers utilized in a collinear geometry. The methodology of this technique will be explained, followed by the presentation and discussion of preliminary values for the charge radius and magnetic dipole moment of 53Ca in the context of the robustness of the N=32 sub shell closure, as well as the prospects to measure 54Ca.
[1] Wienholtz, F. et al. Nature vol. 498, 346-349 (2013)
[2] Steppenbeck, D. et al. Nature vol. 502, 207-210 (2013)
[3] R.F. Garcia Ruiz et al, Nature Physics vol. 12, 594-598 (2016)
Keywords: laser spectroscopy; nuclear shell closure; magic numbers