Upgrades to the collinear laser spectroscopy experiment at the IGISOL

Groote, R. P. de; Roubin, A. de; Campbell, P.; Cheal, B.; Devlin, C. S.; Eronen, T.; Geldhof, S.; Moore, I. D.; Reponen, M.; Rinta‐Antila, S.; Schuh, M.

doi:10.1016/j.nimb.2019.04.028

Cited by 24 publications

(11 citation statements)

References 17 publications

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“…1c. More details on the beamline and data acquisition system can be found in [29]. Stable 89 Y, pro-duced by a spark discharge source, was measured on the 363.4157 nm transition from the ionic ground state using the Matisse TS laser, pumped by a cw frequency doubled YAG-laser (Millenia eV, Spectra Physics) and stabilized to a fixed setpoint in the wavelength meter.…”

Section: Measurement Protocolmentioning

confidence: 99%

On the performance of wavelength meters: Part 1—consequences for medium-to-high-resolution laser spectroscopy

et al. 2020

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Section: Measurement Protocolmentioning

confidence: 99%

On the performance of wavelength meters: Part 1—consequences for medium-to-high-resolution laser spectroscopy

et al. 2020

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“…It is also noted, that the study of isomeric states by nuclear decay spectroscopy is limited if the states are too long-lived or too close in energy to the ground state to be cleanly separated with mass-purification techniques. At the IGISOL facility in the Accelerator Laboratory of the University of Jyväskylä [2], collinear laser spectroscopy [3,4] of actinide elements is a currently ongoing program of research. By combining highly efficient laser resonance ionization in the IGISOL gas cell [5] with thermal desorption of long-lived actinide elements, an efficient ion source can be realized even with trace amounts of isotopes.…”

Section: Introductionmentioning

confidence: 99%

Gas cell studies of thorium using filament dispensers at IGISOL

Pohjalainen

Moore

Geldhof

et al. 2020

Nuclear Instruments and Methods in Physics Research Section B:

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Filament-based dispensers of thorium have been investigated at the IGISOL facility, Jyväskylä, for potential use as a thorium ion source for future collinear laser spectroscopy experiments. Several different filaments were manufactured in the Institute of Atomic and Subatomic Physics of TU Wien, with 232 Th and 229 Th prepared on tantalum substrates either by drying thorium nitrate solution or via molecular plating, while adding a layer of zirconium for oxide reduction. The filaments were characterized in a helium-filled gas cell by performing selective and efficient in-gas-cell resonance laser ionization and by analyzing the resulting ion beams by mass spectrometry. Additionally, the in-gas-cell laser ionization process of thorium was further characterized by wavelength scans, saturation measurements and by recording the temporal behavior of extracted ion pulses. Although an ion source was successfully created with mass-separated intensities over 10 6 ions/s, the required high filament temperature resulted in significant contributions from interfering impurities and deterioration of the filament structure.

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“…The charge radii of the neutron-rich silver isotopes were measured using bunched-beam collinear laser spectroscopy at the IGISOL collinear laser spectroscopy setup 73 , 74 . The isotopes of interest, produced by proton-induced fission of natural uranium, recoil from the target and are stopped in a high-pressure (300 mbar) helium buffer gas.…”

Section: Methodsmentioning

confidence: 99%

Evidence of a sudden increase in the nuclear size of proton-rich silver-96

Reponen

Groote

et al. 2021

Nat Commun

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Understanding the evolution of the nuclear charge radius is one of the long-standing challenges for nuclear theory. Recently, density functional theory calculations utilizing Fayans functionals have successfully reproduced the charge radii of a variety of exotic isotopes. However, difficulties in the isotope production have hindered testing these models in the immediate region of the nuclear chart below the heaviest self-conjugate doubly-magic nucleus 100Sn, where the near-equal number of protons (Z) and neutrons (N) lead to enhanced neutron-proton pairing. Here, we present an optical excursion into this region by crossing the N = 50 magic neutron number in the silver isotopic chain with the measurement of the charge radius of 96Ag (N = 49). The results provide a challenge for nuclear theory: calculations are unable to reproduce the pronounced discontinuity in the charge radii as one moves below N = 50. The technical advancements in this work open the N = Z region below 100Sn for further optical studies, which will lead to more comprehensive input for nuclear theory development.

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Upgrades to the collinear laser spectroscopy experiment at the IGISOL

Cited by 24 publications

References 17 publications

On the performance of wavelength meters: Part 1—consequences for medium-to-high-resolution laser spectroscopy

On the performance of wavelength meters: Part 1—consequences for medium-to-high-resolution laser spectroscopy

Gas cell studies of thorium using filament dispensers at IGISOL

Evidence of a sudden increase in the nuclear size of proton-rich silver-96

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