Showing papers by "Walter Neu published in 1988"
TL;DR: A new nonoptical detection scheme in laser spectroscopy on ion beams of on-line isotope separators consisting of ground-state depopulation by optical pumping in collinear laser--ion-beam interaction, state-selective neutralization, and charge-state--separated fast-atom counting is reported.
Abstract: We report the application of a new nonoptical detection scheme in laser spectroscopy on ion beams of on-line isotope separators. The method consists of ground-state depopulation by optical pumping in collinear laser--ion-beam interaction, state-selective neutralization, and charge-state--separated fast-atom counting. Strontium isotope-shift measurements are extended into the strongly deformed region of the neutron-rich isotopes up to /sup 100/Sr. The radii are generally well described by the droplet model including empirical deformations obtained from B(E2) values.
42 citations
TL;DR: In this article, the hyperfine structure and isotope shift in the ionic (Ra II) transition were measured using collinear fast-beam laser spectroscopy using frequency-doubling of cw dye laser radiation in an external ring cavity.
Abstract: The hyperfine structure and isotope shift of221–226Ra and212,214Ra have been measured in the ionic (Ra II) transition 7s
2
S
1/2–7p
2
P
3/2 (λ=381.4 nm). The method of on-line collinear fast-beam laser spectroscopy has been applied using frequency-doubling of cw dye laser radiation in an external ring cavity. The magnetic hyperfine fields are compared with semi-empirical and ab initio calculations. The analysis of the quadrupole splitting by the same method yields the following, improved values of spectroscopic quadrupole moments:Q
s
(221Ra)=1.978(7)b,Q
s
(223Ra)=1.254(3)b and the reanalyzed valuesQ
s
(209Ra)=0.40(2)b,Q
s
(211Ra)=0.48(2)b,Q
s
(227Ra)=1.58(3)b,Q
s
(229Ra)=3.09(4)b with an additional scaling uncertainty of ±5%. Furthermore, theJ-dependence of the isotope shift is analyzed in both Ra II transitions connecting the 7s
2
S
1/2 ground state with the first excited doublet 7p
2
P
1/2 and 7p
2
P
3/2.
36 citations
01 Sep 1988
TL;DR: In this paper, the quadrupole interaction of nuclear spin polarized 8Li and 9Li in LiNbO3 has been studied at room temperature, and a new value of 25.3 (9) mb was derived.
Abstract: The quadrupole interaction of nuclear spin polarized8Li (I=2) and9Li (I=3/2) in LiNbO3 has been studied at room temperature. The polarization was achieved by optical pumping of a fast atomic beam with circularly polarized laser light. The atoms were implanted into a hexagonal LiNbO3 single crystal and the quadrupole splitting ofβ-NMR spectra was measured. A ratio of ¦Q(9Li)/Q(8Li)¦=0.88(4) for the nuclear quadrupole moments was deduced, yielding a new value of ¦Q(9Li)¦=25.3 (9) mb for the quadrupole moment of9Li.
2 citations
01 Jan 1988
TL;DR: In this article, the chain of Sr isotopes ranges from the neutron-shell closure at N = 50 into both the N = 38 and N = 60 deformation regions which represent the main topic of this workshop.
Abstract: The chain of Sr isotopes ranges from the neutron-shell closure at N = 50 into both the N = 38 and N = 60 deformation regions which represent the main topic of this workshop. For a detailed understanding of the nature of these nuclei, laser spectroscopy can provide the ground state spins and moments, as well as the the changes in the mean square charge radii as a function of the neutron number N. Recent experiments at Karlsruhe [1] and at Daresbury [2] essentially cover the neutron-deficient and stable Sr isotopes between N = 40 and N = 50. In order to complement these results, and to extend the measurements into the region of neutron-rich isotopes, we have performed an experiment at the ISOLDE isotope separator facility at CERN.