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Geithner, W.; Hilligsøe, Karen Marie; Kappertz, S.; Katko, G.; Keim, M.; Kloos, S.; Kotrotsios, G.; Lievens, Peter; Marinova, K. P.; Neugart, R.; Vermeeren, L.; Wilbert, S.

doi:10.1023/a:1012614827735

Cited by 23 publications

(43 citation statements)

References 7 publications

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“…We have used a convenient method of directly measuring the beam kinetic energy [10], which is offered by the atomic spectrum of neon. This is a modification of the technique described by Poulsen [17] and is based on the fact that two optical transitions, separated by twice the Doppler shift, can be excited with the same laser frequency applied in collinear and anticollinear laser beam versus atom beam geometry.…”

Section: Beam Energy Measurement By Collinear Laser Spectroscopymentioning

confidence: 99%

“…The requirement of high experimental accuracy and knowledge of the mass shift scaling constant then adds to the standard sensitivity problem faced by experiments on weak beams of short-lived isotopes. In the reported studies the accuracy requirement was met by an accurate determination of the beam kinetic energy [10] utilizing a novel method of comparing Doppler-shifted transition frequencies. At the same time, the high sensitivity and selectivity were achieved using ultrasensitive nonoptical detection based on optical pumping, state-selective collisional ionization, and observation of the β decay of collected radioactive ions [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Charge radii of neon isotopes across thesdneutron shell

et al. 2011

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We report on the changes in mean square charge radii of unstable neon nuclei relative to the stable 20 Ne, based on the measurement of optical isotope shifts. The studies were carried out using collinear laser spectroscopy on a fast beam of neutral neon atoms. High sensitivity on short-lived isotopes was achieved thanks to nonoptical detection based on optical pumping and state-selective collisional ionization, which was complemented by an accurate determination of the beam kinetic energy. The new results provide information on the structural changes in the sequence of neon isotopes all across the neutron sd shell, ranging from the proton drip line nucleus and halo candidate 17 Ne up to the neutron-rich 28 Ne in the vicinity of the "island of inversion." Within this range the charge radius is smallest for 24 Ne with N = 14 corresponding to the closure of the neutron d 5/2 shell, while it increases toward both neutron shell closures, N = 8 and N = 20. The general trend of the charge radii correlates well with the deformation effects which are known to be large for several neon isotopes. In the neutron-deficient isotopes, structural changes arise from the onset of proton-halo formation for 17 Ne, shell closure in 18 Ne, and clustering effects in 20,21 Ne. On the neutron-rich side the transition to the island of inversion plays an important role, with the radii in the upper part of the sd shell confirming the weakening of the N = 20 magic number. The results add new information to the radii systematics of light nuclei where data are scarce because of the small contribution of nuclear-size effects to the isotope shifts which are dominated by the finite-mass effect.

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Section: Beam Energy Measurement By Collinear Laser Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Charge radii of neon isotopes across thesdneutron shell

et al. 2011

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“…However, the evidence for 17 Ne was not conclusive due to conflicting theoretical and experimental results. Experiments were carried out at ISOLDE/CERN to measure hyperfine structures and isotope shifts of the transition 2p 5 3s 2 [3/2] o 2 − −2p 5 3p 2 [3/2] 2 (λ = 614.5 nm) of 17 Ne and other unstable neon isotopes up to the neutron-rich 28 Ne by using fast-beam collinear laser spectroscopy [5,6,3,7]. The magnetic dipole and the electric quadrupole moments and the charge radii of the nuclei were deduced from these measurements in combination with atomic parameters.…”

Section: Introductionmentioning

confidence: 99%

Atomic parameters for the $2{p}^{5}3p\;{}^{2}{[3/2]}_{2}-2{p}^{5}3s\;{}^{2}{[3/2]}_{2}^{o}$ transition of Ne I relevant in nuclear physics

Godefroid

Wang

2016

J. Phys. B: At. Mol. Opt. Phys.

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We calculated the magnetic dipole hyperfine interaction constants and the electric field gradients of 2p 5 3p 2 [3/2] 2 and 2p 5 3s 2 [3/2] o 2 levels of Ne I by using the multiconfiguration Dirac-Hartree-Fock method. The electronic factors contributing to the isotope shifts were also estimated for the λ = 614.5 nm transition connecting these two states. Electron correlation and relativistic effects including the Breit interaction were investigated in details. Combining with recent measurements, we extracted the nuclear quadrupole moment values for 20 Ne and 23 Ne with a smaller uncertainty than the current available data. Isotope shifts in the 2p 5 3p 2 [3/2] 2 − 2p 5 3s 2 [3/2] o 2 transition based on the present calculated field-and mass-shift parameters are in good agreement with the experimental values. However, the field shifts in this transition are two or three orders of magnitude smaller than the mass shifts, making rather difficult to deduce changes in nuclear charge mean square radii. According to our theoretical predictions, we suggest to use instead transitions connecting levels arising from the 2p 5 3s configuration to the ground state, for which the normal mass shift and specific mass shift contributions counteract each other, producing relatively small mass shifts that are only one order of magnitude larger than relatively large field shifts, especially for the 2p 5 3s 2 [1/2] o 1 − 2p 6 1 S 0 transition.

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“…Special care was taken to keep the laser frequency stabilized, to prevent mode-hops and to eliminate long-term instabilities. The problem with the accuracy of the acceleration voltage was tackled by the development of a method for high accuracy determination of the beam kinetic energy [5]. It is based on the excitation of two optical transitions, separated by twice the Doppler shift, at the same laser frequency in collinear and anti-collinear laser beam geometry, without changing the static part of the acceleration voltage.…”

Section: Methodsmentioning

confidence: 99%

Charge Radii of Argon Isotopes in the f7/2 Shell and Radii Systematics in the Ca-Region

et al. 2006

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Changes in mean square (ms) nuclear charge radii of Ar isotopes across the 1f 7/2 shell are studied by fast beam collinear laser spectroscopy using an ultra-sensitive detection method based on optical pumping and state selective collisional ionisation. The new data set on Ar, in combination with the known charge radii of K, Ca and Ti in the ν1f 7/2 shell, offers an opportunity to obtain a more complete overview of nuclear radii trends around the proton shell closure Z = 20 and between the neutron shell closures N = 20 and N = 28.Key words: mean square charge radii of [38][39][40][41][42][43][44][45][46] Ar isotopes, nuclear radii trend in the calcium region, collinear fast-beam laser spectroscopy, collisional ionisation, method of direct measurement of the beam kinetic energy.

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Cited by 23 publications

References 7 publications

Charge radii of neon isotopes across thesdneutron shell

Charge radii of neon isotopes across thesdneutron shell

Atomic parameters for the $2{p}^{5}3p\;{}^{2}{[3/2]}_{2}-2{p}^{5}3s\;{}^{2}{[3/2]}_{2}^{o}$ transition of Ne I relevant in nuclear physics

Charge Radii of Argon Isotopes in the f7/2 Shell and Radii Systematics in the Ca-Region

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