Isotope shifts in the atomic spectrum of xenon and nuclear deformation effects

Fischer, Wolfgang; Hühnermann, H.; Krömer, G.; Schäfer, Hartmut

doi:10.1007/bf01677442

Cited by 59 publications

(20 citation statements)

References 19 publications

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“…Comparing this E4~ value obtained by means of empirical data with that derived from HF calculation of I$(0)[]s, it turns out that as in other cases [6,10] as also with Ni the HF value (E4s=0.32) is considerably smaller.…”

Section: /Zmentioning

confidence: 95%

“…The value given is according to [3] values of the s-electron density at the nucleus obtained by HF calculations might be too small by 25 to 40% as was shown by similar investigations in other elements [6,10], only the ratios of the experimental FS values which are equal to the ratios of the corresponding A I~,(0)I 2 values are compared with the results of HF calculations as shown in Table 4. The agreement of the theoretical with the experimental data is very satisfactory.…”

Section: Field Shiftsmentioning

confidence: 98%

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Isotope shift in Ni I and changes in mean-square nuclear charge radii of the stable Ni isotopes

1980

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Section: /Zmentioning

confidence: 95%

Section: Field Shiftsmentioning

confidence: 98%

Isotope shift in Ni I and changes in mean-square nuclear charge radii of the stable Ni isotopes

1980

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“…As no experimental hr 2 i values in Nb are known, an approximate technique [13] was used to generate estimates of F ¼ À2:43 GHz Á fm À2 and M ¼ þ716 GHz Á amu from the neutron deficient hr 2 i values of the neighboring Zr chain [14]. The linearity of such modified King plots reflects the regional similarity of the nuclear size systematics.…”

Section: Prl 102 222501 (2009) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Laser Spectroscopy of Niobium Fission Fragments: First Use of Optical Pumping in an Ion Beam Cooler Buncher

et al. 2009

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A new method of optical pumping in an ion beam cooler buncher has been developed to selectively enhance ionic metastable state populations. The technique permits the study of elements previously inaccessible to laser spectroscopy and has been applied here to the study of Nb. Model independent meansquare charge radii and nuclear moments have been studied for 90;90 m;91;91 m;92;93;99;101;103 Nb to cover the region of the N ¼ 50 shell closure and N % 60 sudden onset of deformation. The increase in mean-square charge radius is observed to be less than that for Y, with a substantial degree of softness observed before and after N ¼ 60. Collinear laser spectroscopy has for many years been used to provide the (sole) model-independent probe of charge distributions of radioactive nuclei [1]. Efficient optical measurements are typically limited to transitions from atomic (or ionic) ground states or naturally populated low-lying metastable states. However, elements around Z ¼ 40 such as Y, Nb, and Mo present a variety of challenges to such spectroscopic approaches. In this Letter, we report a new, general technique of wide applicability, in which radio ions are deliberately prepared in metastable states by a rapid and efficient method of optical pumping. The technique is exploited here in the spectroscopic study of the A ¼ 100 region.The well-known onset of deformation in the neutronrich A % 100 region has been of long standing interest and the subject of recent mass [2,3], -ray spectroscopic [4,5], and optical measurements [6,7]. Collinear laser spectroscopy of Y isotopes was recently performed [6] in order to extract quadrupole moments in the region for comparison with charge-radii systematics. It was seen that with increasing neutron number from the N ¼ 50 shell closure, the nuclear deformation becomes increasingly oblate and increasingly soft. At N ¼ 60, the transition to a strongly deformed rigid prolate shape occurs, but prior to this, although the nuclear deformation is increasing with N, a proportionate increase in softness is also observed. Mass measurements [2,3] have indicated that the shape change, which is most pronounced for 39 Y, weakens with increasing Z, becoming almost undetectable in the 42 Mo chain. Further detailed model-independent optical analysis of the mean-square charge radii, nuclear moments and values of spin has so far, however, been impossible in the region because of experimental atomic physics constraints.Production of radioactive beams in this region, which are of a refractory nature, is presently limited to relatively small yields, and efficient spectroscopy is therefore required. Such elements are produced for optical study at the JYFL IGISOL facility, University of Jyväskylä, Finland [8]. Following mass selection at this on-line separator, the emittance of the ion beam is reduced in an ion beam cooler [7], which is a gas-filled rf quadrupole, held at a potential just below the $30 kV of the ion source. If desired, a trapping potential can accumulate the ions at the end of the device for ...

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“…1b (again, the other six are of the same transition shown for the even isotopes). The hyperfine splitting constants are only known for a limited set of energy levels [16][17][18][19][20]. While isotope shifts and all of the hyperfine splitting constants are available for the upper and lower levels of the neutral 823.2 nm transition, the 834.7 nm xenon ion transition only has data on the nuclear spin splitting constants of the upper state, and no information is available on the transitiondependent isotope shifts.…”

Section: Xenon Spectroscopymentioning

confidence: 99%

Laser-induced fluorescence measurements of velocity within a Hall discharge

2001

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) 18-01-2007 REPORT TYPE Journal Article DATES COVERED (From -To) TITLE AND SUBTITLE 5a. CONTRACT NUMBER Laser-induced Fluorescence Measurements of Velocity within a Hall Discharge ABSTRACTThe results of a study of laser-induced fluorescence velocimetry of neutral and singly ionized xenon in the plume and interior portions of the acceleration channel of a Hall thruster plasma discharge operating at powers ranging from 250 to 725 W are described. Axial ion and neutral velocity profiles for four discharge voltage conditions (100V, 160V, 200V, 250V) are measured as are radial ion velocity profiles in the near-field plume. Ion velocity measurements of axial velocity both inside and outside the thruster as well as radial velocity measurements outside the thruster are performed using laser-induced fluorescence with nonresonant signaldetection on the xenon ion 5d[4]7/2-6p[3]5/2 excitation transition while monitoring the signal from the 6s[2]3/2-6p[3]5/2 transition. Neutral axial velocity measurements are similarly performed in the interior of the Hall thruster using the 6s[3/2]02-6p[3/2]2 transition with resonance fluorescence collection. Optical access to the interior of the Hall thruster is provided by a 1-mm-wide axial slot in the insulator outer wall. While the majority of the ion velocity measurements used partially saturated fluorescence to improve the signal-to-noise ratio, one radial trace of the ion transition was taken in the linear fluorescence region and yields a xenon ion translational temperature between 400 and 800 K at a location 13 mm into the plume.

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Isotope shifts in the atomic spectrum of xenon and nuclear deformation effects

Cited by 59 publications

References 19 publications

Isotope shift in Ni I and changes in mean-square nuclear charge radii of the stable Ni isotopes

Isotope shift in Ni I and changes in mean-square nuclear charge radii of the stable Ni isotopes

Laser Spectroscopy of Niobium Fission Fragments: First Use of Optical Pumping in an Ion Beam Cooler Buncher

Laser-induced fluorescence measurements of velocity within a Hall discharge

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