SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Structure and Dynamics of Nuclei I

HK 15.4: Talk

Tuesday, August 31, 2021, 17:45–18:00, H4

Nuclear structure investigations on ^253−255Es by laser resonance ionization spectroscopy — •Steven Nothhelfer for the Einsteinium collaboration — Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — Helmholtz-Institut Mainz, 55099 Mainz, Germany — GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany

Experimental data on the hyperfine structure splittings and isotope shifts of spectral lines in transuranium elements are required to reveal valuable information about the structure of their atomic nuclei. In this talk we will present results of laser resonance ionization spectroscopy performed on the rare isotopes ^253−255Es at the RISIKO mass separator in Mainz. With small sample sizes ranging down to fg, the prominent 351.5 nm ground-state transition was measured in all three Es isotopes, and four additional ground-state transitions were measured in ²⁵⁴Es. Hyperfine structure analysis resulted in spin values of I(²⁵⁴Es) = 7 and I(²⁵⁵Es) = 7/2. From the extracted coupling constants, nuclear magnetic dipole moments as well as spectroscopic electric quadrupole moments were derived. The literature value of the nuclear magnetic dipole moment for ²⁵⁴Es obtained from the angular anisotropy of ²⁵⁴Es α-radiation deviates from our more precise value of this quantity.