Hyperfine anomaly in gold and magnetic moments of Iπ=11/2− gold isomers

Laser-assisted decay spectroscopy for the ground states of Au180,182

“…The first results from this campaign include the determination of spins and magnetic dipole moments of the g.s. for 177,179 Au [15], the discussion of the hyperfine anomaly for the 11/2 − isomeric states in 177,191,193,195 Au [16], and of shape coexistence in 187 Au [17]. In the present work we report on a study of odd-odd isotopes 180,182 Au(N = 101, 103), which are located in the expected region of large ground-state deformation in the neutron-deficient gold nuclei [18].…”

“…The present data originate from the same experimental campaign as described in Refs. [15][16][17], whereby 180,182 Au nuclei were produced in spallation reactions induced by a 1.4-GeV proton beam from the CERN PS Booster, impinging on a 50 g/cm 2 thick UC x target. A proton beam current of up to 2 μA was used.…”

Shape coexistence in Au187 studied by laser spectroscopy

“…As shown in Ref. [14], the RHFA values can be deduced from the ratio of the magnetic hfs constants for different atomic states, a A 6s and a A…”

“…This ratio depends on the nuclear spin and configuration, since different atomic states differ in sensitivity to the nuclear magnetization distribution. This change can be related to the difference of the corresponding RHFA values by introducing a differential hyperfine anomaly (DHFA) [14]:…”

“…calculated using the advanced atomic approaches in Ref. [14], η 6s,6p = 4.0(3), the RHFA value needed for the magnetic moment evaluation [Eq. (4)] is deduced from the measured DHFA:…”