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  • Letter
  • Open Access

Nuclear structure investigations of Es253−255 by laser spectroscopy

S. Nothhelfer1,2,3, Th. E. Albrecht-Schönzart4, M. Block1,2,3, P. Chhetri2,3, Ch. E. Düllmann1,2,3, J. G. Ezold5, V. Gadelshin1,6, A. Gaiser4,*, F. Giacoppo2,3 et al.

R. Heinke1,†, T. Kieck1,2,3, N. Kneip1, M. Laatiaoui1,2,3, Ch. Mokry1,2, S. Raeder2,3, J. Runke1,3, F. Schneider1,2, J. M. Sperling4, D. Studer1, P. Thörle-Pospiech1,2, N. Trautmann1, F. Weber1, and K. Wendt1

  • 1Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
  • 2Helmholtz-Institut Mainz, 55099 Mainz, Germany
  • 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
  • 4Florida State University, 32306 Tallahassee, Florida, USA
  • 5Oak Ridge National Laboratory, Oak Ridge, 37831 Oak Ridge, Tennessee, USA
  • 6Ural Federal University, 620002 Yekaterinburg, Russia

  • *Present address: Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  • †Present address: CERN, CH-1211 Geneva 23, Switzerland.
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Phys. Rev. C 105, L021302 – Published 4 February, 2022

DOI: https://doi.org/10.1103/PhysRevC.105.L021302

Abstract

Laser resonance ionization spectroscopy was performed on the rare einsteinium isotopes Es253−255 at the RISIKO mass separator in Mainz. With low sample sizes ranging down to femtograms, the prominent 352 nm-ground-state transition was measured in all three einsteinium isotopes, and four additional ground-state transitions were measured in Es254. Hyperfine-structure analysis resulted in assigned spin values of I(Es254)=7 and I(Es255)=7/2. From the extracted coupling constants, nuclear magnetic dipole moments of μI(Es254)=3.42(7)μN and μI(Es255)=4.14(10)μN as well as spectroscopic electric quadrupole moments of Qs(Es254)=9.6(1.2)eb and Qs(Es255)=5.1(1.7)eb were derived. Our value for Es254 deviates from the value of |μI(Es254)|=4.35(41)μN extracted from the angular anisotropy of α-radiation emitted by Es254.

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Phys. Rev. C 105, L021302– Published 4 February, 2022
  • Received 23 July 2021
  • Accepted 3 January 2022
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