Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Structure and Dynamics of Nuclei I

HK 3.7: Talk

Monday, February 26, 2018, 15:45–16:00, HZO 70

Accurate isotope shift measurement in the D1 and D2 line of Ba⁺ — •Phillip Imgram, Kristian König, Jörg Krämer, Tim Ratajczyk, and Wilfried Nörtershäuser — Institut für Kernphysik, TU Darmstadt

The binding energy especially of s-electrons are affected by the finite nuclear size. Isotope shift measurements of electronic transitions provide therefore information about the nuclear charge radius. The sensitivity of the S_1/2 → P_1/2 (D1) and the S_1/2 → P_3/2 (D2) transitions in earth alkaline ions to this finite nuclear size effect should be identical apart from a small relativistic contribution, which can be explained with the relativistic admixture of the S_1/2 wave function to the P_1/2 configuration and has been measured for the first time by K. Wendt et al. [1] in Ba⁺. Recent measurements of this effect in Ca⁺ ions have revealed a considerable discrepancy to theoretical predictions [2]. To check whether such a discrepancy is also apparent in the Ba⁺ system, measurements of higher accuracy as in [1] are required. Therefore, the absolute transition frequencies in several stable barium isotopes have been measured with a collinear/anti-collinear laser spectroscopy approach [3].

[1] K. Wendt et al., Z. Phys. A 318, 125 - 129 (1984)

[2] C. Shi et al., Appl. Phys. B (2017), 123:2

[3] A. Krieger et al., Appl. Phys. B (2017) 123:15