The shape transition in the neutron-rich yttrium isotopes and isomers

Cheal, B.; Gardner, M.; Avgoulea, M.; Billowes, J.; Bissell, M. L.; Campbell, P.; Eronen, T.; Flanagan, Kieran; Forest, D. H.; Huikari, J.; Jokinen, A.; Marsh, B. A.; Moore, I. D.; Nieminen, A.; Penttilä, H.; Rinta‐Antila, S.; Tordoff, B.; Tungate, G.; Äystö, J.

doi:10.1016/j.physletb.2006.12.053

Cited by 96 publications

(101 citation statements)

References 24 publications

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“…Isotope shifts for 89,96,98 Y measured on the 294.6-nm transition, together with the corresponding changes in mean-square charge radii using MCDF calculations of F and M for this transition. Note that the value given for the δν 96,98 isotope shift is from a measurement taken independently of those for δν 89 [14] and the 294.6-nm transition in the doubly charged ion used in this work.…”

Section: Discussionmentioning

confidence: 99%

“…7, together with the empirical estimates [14] and those deduced using MCDF calculations performed for the 363.3-and 321.7-nm lines [22]. Unlike the calculations for the singly charged ion, the calculations for the 294.6-nm line are relatively simple because the levels involved in the transitions have no open d subshells.…”

Section: Discussionmentioning

confidence: 99%

“…In the Z ≈ 40 region of the nuclear chart, a sudden onset of nuclear deformation occurs at N ≈ 60 [5,[14][15][16]. This dramatic shape transition is accompanied by a sharp increase in mean-square nuclear charge radius.…”

Section: Introductionmentioning

confidence: 99%

“…This dramatic shape transition is accompanied by a sharp increase in mean-square nuclear charge radius. The yttrium isotope chain is of particular interest, as it appears to fall right in the center of this deformed region of the nuclear chart and is seemingly the element for which the effect is most prominent [14]. From N = 50 to N = 59, the yttrium nuclei were observed to become increasingly oblate, accompanied by a proportional increase in nuclear softness, having a significant dynamic component to the total deformation.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, this approach has mainly been tested for isotope shifts of lighter elements and isotopes with simpler valence-shell structures [22]. For yttrium, laser spectroscopy was previously performed on singly charged ions of 86−90,92−102 Y, using the 363.3-nm 5s 2 1 S 0 → 4d5p 1 P 1 transition [14]. Although exhibiting a high spectroscopic efficiency, an evaluation of the F and M factors could only be performed empirically, by assuming radial trends similar to other isotopes in the region.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Isotope shifts from collinear laser spectroscopy of doubly charged yttrium isotopes

et al. 2018

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Binding Energy of Strongly Deformed Radionuclides

Manea

2015

Springer Theses

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The most complex nuclei are situated between the magic and the mid-shell ones, in regions known for sudden changes of the trends of nuclear observables. These are the so-called shape-transition regions, where the nuclear paradigm changes from the vibrational liquid drop to the static rotor. With few exceptions, nuclei in these regions are radioactive, with half-lives dropping into the millisecond range.Complementing the information obtained from the low-lying excitation spectrum, nuclear binding energies and mean-square charge radii are among the observables most sensitive to these changes of nuclear structure. In the present work, a study of the shapetransition phenomenon is performed by measurements of radioactive nuclides produced by the ISOLDE facility at CERN. The masses of the neutron-rich rubidium isotopes 98−100 Rb and of the neutron-deficient gold isotopes 180,185,188,190,191 Au are determined using the Penning-trap mass spectrometer ISOLTRAP. The mass of 100 Rb is determined for the first time. Significant deviations from the literature values are found for the isotopes 188,190 Au. A new experimental method is presented, using a recently developed multi-reflection time-of-flight mass spectrometer as a beam-analysis tool for resonanceionization laser spectroscopy. The new method opens the path to measurements of atomic hyperfine spectra with ISOLTRAP, from which charge radii and electromagnetic moments of radioactive nuclides can be extracted.The properties of the studied nuclides map the borders of two prominent regions of quadrupole deformation, which constrain the fine balance between pairing and quadrupole correlations in the nuclear ground states. This balance is studied by the Hartree-FockBogoliubov (HFB) approach. The sensitivity of the shape-transition phenomenon to the strength of pairing correlations is demonstrated. In particular, the strong odd-even staggering of charge radii in the mercury isotopic chain is shown to result in the HFB approach from the fine interplay between pairing, quadrupole correlations and quasiparticle blocking.

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Self-consistent Mean-Field Calculations

Manea

2015

Binding Energy of Strongly Deformed Radionuclides

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The shape transition in the neutron-rich yttrium isotopes and isomers

Cited by 96 publications

References 24 publications

Isotope shifts from collinear laser spectroscopy of doubly charged yttrium isotopes

Isotope shifts from collinear laser spectroscopy of doubly charged yttrium isotopes

Binding Energy of Strongly Deformed Radionuclides

Self-consistent Mean-Field Calculations

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