Inverse odd-even staggering in nuclear charge radii and possible octupole collectivity in 217,218,219At^{217,218,219}\mathrm{At} revealed by in-source laser spectroscopy

May 14, 2019
9 pages
Published in:
  • Phys.Rev.C 99 (2019) 5, 054317
  • Published: May 14, 2019
Experiments:

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Abstract: (APS)
Hyperfine-structure parameters and isotope shifts for the 795-nm atomic transitions in 217,218,219^{217,218,219}At have been measured at CERN-ISOLDE, using the in-source resonance-ionization spectroscopy technique. Magnetic dipole and electric quadrupole moments, and changes in the nuclear mean-square charge radii, have been deduced. A large inverse odd-even staggering in radii, which may be associated with the presence of octupole collectivity, has been observed. Namely, the radius of the odd-odd isotope 218^{218}At has been found to be larger than the average of its even-NN neighbors, 217,219^{217,219}At. The discrepancy between the additivity-rule prediction and experimental data for the magnetic moment of 218^{218}At also supports the possible presence of octupole collectivity in the considered nuclei.
  • Nuclear Structure