First On-Line Laser Spectroscopy of Radioisotopes of a Refractory Element

Levins, John M.; Benton, David M.; Billowes, J.; Campbell, P.; Cooper, T G; Dendooven, P.; Evans, D. E.; Forest, D. H.; Grant, I. S.; Griffith, J.A.R.; Huikari, J.; Jokinen, A.; Perajärvi, K.; Tungate, G.; Yeandle, G.; Äystö, J.

doi:10.1103/physrevlett.82.2476

Cited by 61 publications

(43 citation statements)

References 21 publications

(28 reference statements)

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“…The results are displayed in figure 1 and compared with the Yb [8] and Lu [9] chains. The hafnium results, which have been discussed by Levins et al [5], agree well with the quadrupole deformation predictions of M611er et al [7]. In particular, the reversal of the odd-even staggering at N=99 and 101 was expected because of the greater deformation predicted for I ' I ' I 95 100 105…”

Section: Results For Hafnium Isotopes and Isomerssupporting

confidence: 70%

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Laser spectroscopy of radioisotopes and isomers at the igisol facility, Jyväskylä

et al. 2000

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We report on the progress of the collinear laser spectroscopy programme at the IGISOL isotope separator in Jyv~kyl~i. The sensitivity of the photon-ion coincidence tecnique has been sufficient to measure isotope shifts and hyperfine structures of light hafnium isotopes produced in 175Lu(p,xn) reactions. A gas-filled RF quadrupole has recently been installed in the beamline to reduce the energy spread and emittance of the ion beam. It is expected to increase the sensitivity of the laser technique by at least an order of magnitude, allowing measurements on a number of high-spin isomers in the hafnium chain. Status of the laser programme at the IGISOLOur laser collaboration decided to base its research programme at the IGISOL facility in Jyv/iskyl~ for two reasons. Firstly, the radioactive beam fluxes suited our ion-photon coincidence technique [1], which had been developed at the Daresbury Laboratory Nuclear Structure Facility. Secondly, it would allow refractory elements and millisecond isomers to be studied on-line for the first time.Considerable development work and effort were needed to adapt the IGISOL ion beam properties to the requirements of the laser technique, and it was three years before a resonance of a refractory radioisotope was observed. This was on the 327.6nm transition in the 8SZr+ ion produced in the sgy(p,2n) reaction with a 25 MeV proton beam of 15 #A. The ion beam flux was 12,000 ions/sec, of which approximately 8,000 ions/sec were SSZr. During the development time, four problem areas were identified: (i) the energy spread of the IGISOL ion beam increased rapidly with the voltage on the skimmer plate [2] and a compromise in ion source efficiency was necessary to limit it; (ii) background beams of isobaric contaminants (molecular ions) could give unacceptably high counting rates in the ion detector, increasing the random rate in the coincidence system. These beams could be significantly reduced by baking and conditioning the IGISOL chamber before use, and running with more effective cooling; (iii) off-line laser fluorescence tests showed that many ionic metastable states were populated in the ion source (in this case, from

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Section: Results For Hafnium Isotopes and Isomerssupporting

confidence: 70%

“…The highlight of the IGISOL laser work has been the measurement of the light hafnium isotopes, produced in 175Lu(p,xn) reactions at proton beam energies of 20, 20, 40 and 55 MeV [5]. More recently we have have collected and analyzed data for 171Hf and the 171mHf isomer.…”

Section: Results For Hafnium Isotopes and Isomersmentioning

confidence: 99%

Laser spectroscopy of radioisotopes and isomers at the igisol facility, Jyväskylä

et al. 2000

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“…24 The method is well suited to isomers with T 1/2 > 50 ms, and refractory elements such as hafnium 25 can be studied with ion-guide techniques. It is particularly intriguing that isomer charge radii are found 26,27 to be smaller than their corresponding ground-state radii.…”

Section: Charge Radiimentioning

confidence: 99%

Isomer Beams

Walker

2006

Int. J. Mod. Phys. E

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As a subset of radioactive beams, isomer beams open up the dimensions of excitation energy and angular momentum. The problem of isomer decay rates is briefly presented, as they are not yet well understood. The use of isomer beams for nuclear structure investigations is reviewed, using examples related to exotic decay modes, charge radii, and Coulomb excitation. There are also unique possibilities for the study of induced electromagnetic depopulation. A key aspect is beam purification, for which different techniques are discussed.

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“…Reaction products recoil into an inert buffer gas and are subsequently carried out in a supersonic gas jet. This allows for the study of a range of radionuclides which are not available at facilities where conventional thick targets are used (due to the physical or chemical properties of the products [29,30]). Various "ion guide" gas cell designs are available for fission, light-ion induced fusion evaporation and heavy-ion reactions, sputtering of macroscopic samples, and laser resonance ionization.…”

Section: Experimental Methodologymentioning

confidence: 99%

Isotope shifts from collinear laser spectroscopy of doubly charged yttrium isotopes

et al. 2018

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Isotope shifts from collinear laser spectroscopy of doubly charged yttrium isotopes Vormawah, L. J.; Vilén, Markus; Beerwerth, R.; Campbell, P.; Cheal, B.; Dicker, A.; Eronen, Tommi; Fritzsche, S.; Geldhof, Sarina; Jokinen, Ari; Kelly, S.; Moore, Iain; Reponen, Mikael; Rinta-Antila, Sami; Stock, S. O.; Voss, Annika Vormawah, L. J., Vilén, M., Beerwerth, R., Campbell, P., Cheal, B., Dicker, A., . . . Voss, A. (2018 Collinear laser spectroscopy has been performed on doubly charged ions of radioactive yttrium in order to study the isotope shifts of the 294.6-nm 5s 2 S 1/2 → 5p 2 P 1/2 line. The potential of such an alkali-metal-like transition to improve the reliability of atomic-field-shift and mass-shift factor calculations, and hence the extraction of nuclear mean-square radii, is discussed. Production of yttrium ion beams for such studies is available at the IGISOL IV Accelerator Laboratory, Jyväskylä, Finland. This newly recommissioned facility is described here in relation to the on-line study of accelerator-produced short-lived isotopes using collinear laser spectroscopy and application of the technique to doubly charged ions.

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First On-Line Laser Spectroscopy of Radioisotopes of a Refractory Element

Cited by 61 publications

References 21 publications

Laser spectroscopy of radioisotopes and isomers at the igisol facility, Jyväskylä

Laser spectroscopy of radioisotopes and isomers at the igisol facility, Jyväskylä

Isomer Beams

Isotope shifts from collinear laser spectroscopy of doubly charged yttrium isotopes

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