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Nuclear moments and isotope shifts of the actinide isotopes 249–253Cf probed by laser spectroscopy

par Weber, F;Albrecht-Schönzart, T.E.;Allehabi, S.O.;Berndt, S.;Block, Michael;Dorrer, Holger;Düllmann, C.E.;Dzuba, Vladimir A.;Ezold, Julie G.;Flambaum, Victor V.;Gadelshin, Vadim;Goriely, Stéphane ;Harvey, Ashley;Heinke, Reinhard;Hilaire, Stéphane;Kaja, Magdalena;Kieck, Tom;Kneip, Nina;Köster, Ulli;Lantis, Jeremy;Mokry, Christoph;Münzberg, Danny;Nothhelfer, Steven;Oberstedt, S.;Péru, S.;Raeder, Sebastian;Runke, Jörg;Sonnenschein, Volker;Stemmler, Matou;Studer, Dominik;Thorle-Pospiech, Petra;Tomita, Hideki;Trautmann, Norbert;Van Cleve, Shelley;Warbinek, Jessica;Wendt, Klaus
Référence Physical review. C, Nuclear physics, 107, page (034313)
Publication Publié, 2023-03-21

Article révisé par les pairs

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Résumé :

We report on high-resolution laser spectroscopy studies on Cf249-253 with spectral linewidths in the order of 100 MHz carried out at the RISIKO mass separator at Mainz University. In total three atomic ground-state transitions were investigated and the hyperfine parameters for the odd-A isotopes and isotope shift for all examined isotopes have been determined from the measured spectra. The isotope shift measurements allowed tracking of changes in mean-squared charge radii across the deformed nuclear shell closure at N=152, whereby shape discontinuities were not observed. Experimental hyperfine coupling constants of the atomic ground state were combined with relativistic many-body atomic calculations to extract the nuclear magnetic-dipole moment of Cf249 with improved precision to μI(249Cf)=-0.395(17)μN, whereas μI(251Cf)=-0.571(24)μN and μI(253Cf)=-0.731(35)μN were derived for the first time. Additionally, the spectroscopic quadrupole moments QS(249Cf)=6.27(33)eb and QS(253Cf)=5.53(51)eb were extracted.