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

We report on high-resolution laser spectroscopy studies on 249−253Cf with spectral linewidths in the order of 100MHz 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 249Cf 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.

WEBER Felix;  ALBRECHT-SCHÖNZART Thomas;  ALLEHABI Saleh;  BERNDT Sebastian;  BLOCK Michael;  DORRER Holger;  DÜLLMANN Christoph;  DZUBA Vladimir;  EZOLD Julie;  FLAMBAUM Victor;  GADELSHIN Vadim;  GORIELY S.;  HARVEY Ashley;  HEINKE Reinhard;  HILAIRE S.;  KAJA Magdalena;  KIECK Tom;  KNEIP Nina;  KÖSTER U.;  LANTIS Jeremy;  MOKRY Christoph;  MÜNZBERG Danny;  NOTHHELFER Steven;  OBERSTEDT Stephan;  PERU Sophie;  RAEDER Sebastian;  RUNKE Jörg;  SONNENSCHEIN Volker;  STEMMLER Matou;  STUDER Dominik;  THÖRLE-POSPIECH Petra;  TOMITA Hideki;  TRAUTMANN Norbert;  VAN CLEVE Shelley;  WARBINEK Jessica;  WENDT Klaus; 

2023-03-23

AMER PHYSICAL SOC

JRC132451

2469-9985 (online),   

https://journals.aps.org/prc/abstract/10.1103/PhysRevC.107.034313,    https://publications.jrc.ec.europa.eu/repository/handle/JRC132451,   

10.1103/PhysRevC.107.034313 (online),