No abstract available

[en] The isotope shift between ¹⁹⁷Au (stable) and ¹⁹⁵Au (T₁sub(/)₂=183 d) was determined by resonance fluorescence and polarization spectroscopy in the 6s²S₁sub(/)₂-6p²P₁sub(/)₂, lambda=267.6 nm line. The result is deltaν¹⁹⁵sup(,)¹⁹⁷=-2.9(2) GHz corresponding to a change of the meansquare charge radius by delta< r²>¹⁹⁵sup(,)¹⁹⁷=0.063(9) fm². The sample was confined to a resonance cell heated to temperatures of up to 1500⁰C. (orig.)

[en] The isotope shift between ¹⁹⁷Au (stable) and the radioactive Au isotopes ¹⁹⁰Au, ¹⁹¹Au, ¹⁹²Au and ¹⁹³Au were determined by resonance fluorescence spectroscopy in the 6s²Ssub(1/2)-6p²Psub(1/2). lambda=267,6 nm line. The unstable Au isotopes were produced at the ISOLDE mass separator at CERN. The nuclei were investigated semi on-line in a resonance vessels, heated to 1,400⁰C. The results are deltaνsup(190,197)=11.12(39) GHz. deltaνsup(191,197)=-9.67(12) GHz, deltaνsup(192,197)=-8.32(15) GHz, deltaνsup(193,197)=-6.29(11) GHz, corresponding to a change of the mean-square charge radius by delta< r²>sup(190,197)=0.261(12) fm, delta< r²>sup(191,197)=0.227(5) fm, delta< r²>sup(192,197)=0.195(5) fm, delta< r²>sup(193,197)=0.148(4) fm. (orig.)

No abstract available

No abstract available

[en] The spins of several nuclear ground and isomeric states have been measured for a number of mercury isotopes. The fluorescent light from the 6s6p³P₁ state is observed at 2537 Angstroem after excitation with the frequency doubled output of a pulsed dye laser. Four different laser induced fluorescence techniques were tested for their applicability: double resonance, Hanle effect, time delayed integral Hanle beats, and time resolved quantum beats. The sensitivity and selectivity of these models are compared with emphasis on the determination of spins of nuclei far from beta-stability, where short half lives and low production yields restrict the number of available atoms. The experiments were carried out on-line with the ISOLDE isotope separator at CERN at densities as low as 10⁶ atoms/cm³. Results for the very neutron deficient high spin mercury isomers with half lives of several seconds, but also for the ground states of the abundant low spin stable mercury isotopes, are given as examples. The test measurements determined the nuclear spins of the odd sup(185m-191m)Hg isomers to be I = 13/2. (orig.)

[en] An optical pumping apparatus has been attached to the reconstructed ISOLDE on-line mass separator at CERN in order to obtain nuclear data of isotopes far from β stability. As first results the spins of ⁷⁶Rb(Tsub(1/2) = 36.8s) and ¹¹⁹Cs(Tsun(1/2) = 37.7s) have been determined by β radiation detected optical pumping (β-RADOP) to be I = 1 and I = 9/2 respectively. (orig.)

[en] The isotope shifts of ¹⁸⁸Hg, ¹⁸⁶Hg, and ¹⁸⁴Hg in the 2537-A line have been measured by use of a tunable dye laser at the on-line mass separator ISOLDE at CERN. The results are deltaν(¹⁸⁸Hg-²⁰⁴Hg) = 35.8(2) GHz; deltaν(¹⁸⁶Hg-²⁰⁴Hg) = 39.4(2) GHz; and deltaν(¹⁸⁴Hg-²⁰⁴Hg) = 43.1(2) GHz. These data combined with those obtained by β-radiation--detected optical pumping (β-RADOP) on the odd Hg isotopes yield a huge odd-even staggering for ¹⁸⁵Hg of γ = (2deltaν¹⁸⁵/¹⁸⁴) / deltaν¹⁸⁶/¹⁸⁴ = 13(1) which has to be interpreted as nuclear shape staggering

[en] By use of a pulsed tunable dye laser the isotope shift of (Tsub(1/2)=20 min) ¹⁹⁰Hg in the 6s²¹S₀-6s6p ³P₁, lambda=2537 A line has been measured at the on-line mass separator ISOLDE/CERN. The preliminary result relative to ²⁰⁴Hg is ISsup(204/190)=31.8(3) GHz. (Auth.)

[en] With a pulsed tunable dye laser the isotope shift of (Tsub(1/2)=20 min) ¹⁹⁰Hg in the 6s²¹S₀-6s6p ³P₁, lambda=2537 A line has been measured at the on-line mass separator ISOLDE/CERN. The preliminary result relative to ²⁰⁴Hg is ISsup(204/190)=31.8(3) GHz. (Auth.)