Showing papers by "Walter Neu published in 1987"
TL;DR: In this article, the angular asymmetry of the β-radiation from the polarized nuclei was used to detect the hfs of the 2s 2 S 1 2 −2 p 2 P 1 2 resonance line and the NMR signal cubic LiF crystal lattice.
113 citations
TL;DR: In this paper, the Larmor precession of optically pumped atoms in a fast beam was measured at ISOLDE (isotope separator at the CERN synchrocyclotron).
Abstract: The nuclear magnetic moments of $^{213}\mathrm{Ra}$ and $^{225}\mathrm{Ra}$ have been measured at ISOLDE (isotope separator at the CERN synchrocyclotron) by observation of the Larmor precession of optically pumped atoms in a fast beam. The results ${\ensuremath{\mu}}_{I}$(${}^{213}$Ra)=0.6133(18)${\ensuremath{\mu}}_{N}$ and ${\ensuremath{\mu}}_{1}$${(\mathrm{}}^{225}$Ra)= -0.7338(15)${\ensuremath{\mu}}_{N}$ provide an accurate test of ab initio and semiempirical calculations from optical hyperfine structures in Ra i and Ra ii. .AE
50 citations
TL;DR: In this article, the isotope shift (IS) and hyperfine structure (hfs) measurements have been performed on seven lines of the platinum I spectrum with interference as well as laser fluorescence spectroscopy.
Abstract: Isotope shift (IS) and hyperfine structure (hfs) measurements have been performed on seven lines of the platinum I spectrum with interference as well as laser fluorescence spectroscopy. In the latter case a frequency-doubled single-mode cw dye laser was applied. The IS of190Pt with a natural abundance of only 0.01% was determined to beδν
190, 192=−38.65(8) mK in theλ306.47 nm transition. The IS parameters and the effective hfs integrals in the configuration (5d+6s)10 were determined in intermediate coupling by a least squares fit of the IS and hfs data with eigenvectors obtained from the platinum fine structure (fs). The results are compared with theoretical values and yield improvedδ〈r
2〉 data.
18 citations
TL;DR: In this article, the ground state spins of the odd-mass strontium isotopes between A=79 and 97 were determined by measurements of the hyperfine structure in the ionic transition 5s2S1/2−5p2P3/2.
Abstract: Nuclear ground state spins of the odd-mass strontium isotopes between A=79 and 97 were determined by measurements of the hyperfine structure in the ionic transition 5s2S1/2−5p2P3/2. The spins of93Sr and97Sr are revised to I=5/2 and I=1/2, respectively, while assignments for the remaining isotopes are confirmed.
8 citations
01 Jan 1987
TL;DR: In this paper, an alternative ionization scheme was developed for collinear laser spectroscopy on fast atomic beams, where the increase in sensitivity has considerably enlarged the range of isotopes very far from stability, for which nuclear moments and radii can be investigated in hyperfine structure and isotope shift measurements.
Abstract: The concept of laser ionization has been widely used in spectroscopy studies and for the detection of minute samples of atoms. Being based on ion counting, it avoids the sensitivity problems of conventional fluorescence spectroscopy, which are due to low detection efficiency and large background from scattered laser light. We report the first application of an alternative ionization scheme which we have developed for collinear laser spectroscopy on fast atomic beams /1/. Here the increase in sensitivity has considerably enlarged the range of isotopes very far from stability, for which nuclear moments and radii can be investigated in hyperfine structure and isotope shift measurements.