Mainz 2026 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 5: Poster

MS 5.8: Poster

Wednesday, March 4, 2026, 17:00–19:00, Philo 1. OG

Isotope shift and hyperfine structure measurements in curium — •R. Hasse^1,3,4, T. E. Albrecht², S. Berndt¹, M. Block^1,3,4, Ch. E. Düllmann^1,3,4, J. G. Ezold⁵, U. Köster⁶, A. T. Loria Basto^1,4, Ch. Mokry^1,4, K. Myhre⁵, S. Raeder^3,4, D. Renisch^1,4, J. Runke^1,3, S. K. Schrell⁵, M. Stemmler^1,7, and K. Wendt¹ — ¹JGU, Mainz, Germany — ²CSM, Golden, CO, United States — ³GSI, Darmstadt, Germany — ⁴HIM, Mainz, Germany — ⁵ORNL, Oak Ridge, TN, United States — ⁶ILL, Grenoble, France — ⁷LU, Hannover, Germany

Curium (Z=96) is a minor actinide that is produced in nuclear reactors and therefore present in spent nuclear fuel. We report on high resolution resonance ionization mass spectrometry at RISIKO employing a narrowband Ti:Sa laser on the isotopes ^{242−248,250}Cm to determine isotope shifts and the hyperfine structures of the odd-A isotopes ^243,245,247Cm. For these measurements two ground state transitions from 5f⁷6d7s⁹D₂^o to the excited states 5f⁷6d7s7p⁹D₃ and 5f⁸6d7s⁹D₃ were used in two-step ionization schemes. The sample sizes ranged from 10⁷ atoms of the isotope ²⁵⁰Cm to 10¹³ atoms of the more abundant isotopes ^246,248Cm. In a King-plot analysis these results are analyzed to derive so far missing nuclear mean square charge radii differences of the isotopes ^242,247,250Cm. Additional analysis of the hyperfine structure using the SATLAS package yields the hyperfine parameters A and B.

Keywords: Isotope shift; RIMS; Curium