A gas-jet apparatus for high-resolution laser spectroscopy on the heaviest elements at SHIP

Raeder, S.; Block, M.; Chhetri, P.; Ferrer, R.; Kraemer, Sandro; Kron, T.; Laatiaoui, M.; Nothhelfer, Steven; Schneider, F.; Duppen, P. Van; Verlinde, M.; Verstraelen, E.; Walther, Thomas; Zadvornaya, A.

doi:10.1016/j.nimb.2019.05.016

Cited by 19 publications

(38 citation statements)

References 18 publications

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“…With the short cycle, it was possible to detect 154 Yb from resonant laser ionization for the first time. The limited resolution in the gas cell [27] did not allow resolving the hyperfine structure of three expected hyperfine components in 155 Yb with a nuclear spin of I = 7/2. In addition, the expected isotope shift of around 1 GHz [29][30][31][32] is much smaller compared to the spectral linewidth of the FES laser of approximately 6 GHz and has therefore not been properly determined with the available statistics.…”

Section: Results With the Short Radris Cycle Implementationmentioning

confidence: 99%

“…Due to the limited mobility [6,26] of the Yb ions in the argon buffer gas, the ions reach the detector with a certain delay. The stopping distribution of the recoils in the gas cell [27] in addition to diffusion processes lead to an increased width of the distribution of the ions' arrival time at the detector. To determine the time required for the ions to reach the detector, one has to solve the differential equation describing the increasing number of 154 Yb ions on the detector after every accelerator beam pulse with respect to their successive decay as…”

Section: Short Radris Cycle Developmentmentioning

confidence: 99%

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Advancing Radiation-Detected Resonance Ionization towards Heavier Elements and More Exotic Nuclides

Warbinek

Anđelić

Block

et al. 2022

Atoms

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RAdiation-Detected Resonance Ionization Spectroscopy (RADRIS) is a versatile method for highly sensitive laser spectroscopy studies of the heaviest actinides. Most of these nuclides need to be produced at accelerator facilities in fusion-evaporation reactions and are studied immediately after their production and separation from the primary beam due to their short half-lives and low production rates of only a few atoms per second or less. Only recently, the first laser spectroscopic investigation of nobelium (Z=102) was performed by applying the RADRIS technique in a buffer-gas-filled stopping cell at the GSI in Darmstadt, Germany. To expand this technique to other nobelium isotopes and for the search for atomic levels in the heaviest actinide element, lawrencium (Z=103), the sensitivity of the RADRIS setup needed to be further improved. Therefore, a new movable double-detector setup was developed, which enhances the overall efficiency by approximately 65% compared to the previously used single-detector setup. Further development work was performed to enable the study of longer-lived (t1/2>1 h) and shorter-lived nuclides (t1/2<1 s) with the RADRIS method. With a new rotatable multi-detector design, the long-lived isotope 254Fm (t1/2=3.2 h) becomes within reach for laser spectroscopy. Upcoming experiments will also tackle the short-lived isotope 251No (t1/2=0.8 s) by applying a newly implemented short RADRIS measurement cycle.

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Section: Results With the Short Radris Cycle Implementationmentioning

confidence: 99%

Section: Short Radris Cycle Developmentmentioning

confidence: 99%

Advancing Radiation-Detected Resonance Ionization towards Heavier Elements and More Exotic Nuclides

Warbinek

Anđelić

Block

et al. 2022

Atoms

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“…This new technique enabled a detailed characterization of gas jets created by different nozzle geometries [175]. Dedicated apparatuses are developed to employ laser spectroscopy in a supersonic gas jet at the in-flight separator S 3 at GANIL [173,129], the Mass Analysing Recoil Apparatus (MARA) separator at Jyväskylä University [176,177] and in a modified version using ionguiding electric fields and neutralization on filaments at the Separator for Heavy-Ion reaction Products (SHIP) of the GSI [178].…”

Section: Laser Ionization In a Gas Jetmentioning

confidence: 99%

Recent progress in laser spectroscopy of the actinides

Block,

Laatiaoui,

Raeder

2020

Preprint

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The interest to perform laser spectroscopy in the heaviest elements arises from the strong impact of relativistic effects, electron correlations and quantum electrodynamics on their atomic structure. Once this atomic structure is well understood, laser spectroscopy also provides access to nuclear properties such as spins, mean square charge radii and electromagnetic moments in a nuclear-model independent way. This is of particular interest for the heaviest actinides around N = 152, a region of shell-stabilized deformed nuclei. The experimental progress of laser spectroscopy in this region benefitted from continuous methodological and technical developments such as the introduction of buffer-gas-stopping techniques that enabled the access to ever more exotic nuclei far-off stability. The key challenges faced in this endeavor are small yields, nuclides with rather short half-lives and the need to search for atomic transitions in a wide spectral range guided by theoretical predictions. This paper describes the basics of the most common experimental methods and discusses selected recent results on the atomic and nuclear properties of the actinides up to nobelium where pioneering experiments were performed at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany.

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“…Due to the pressure and temperature conditions in the gas cell, the spectral resolution is limited to about 3 GHz. This is often insufficient to resolve all individual hyperfine components of the studied optical transition, as, e.g., in the case of 253 No [10]. Additionally, species with half-lives of less than approximately one second are inaccessible to the RADRIS technique due to decay losses during recoil ion collection.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, species with half-lives of less than approximately one second are inaccessible to the RADRIS technique due to decay losses during recoil ion collection. To overcome both of these limitations, JetRIS has been constructed for high-resolution resonance ionization spectroscopy in a hypersonic gas-jet [10]. JetRIS combines the high resolution of the in-gas-jet laser spectroscopy technique developed at KU Leuven [11][12][13] with the sensitivity of the ion collection and neutral desorption from a heated filament used in the RADRIS technique [14,15].…”

Section: Introductionmentioning

confidence: 99%

Resolution Characterizations of JetRIS in Mainz Using 164Dy

Münzberg

Block

Claessens

et al. 2022

Atoms

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Laser spectroscopic studies of elements in the heavy actinide and transactinide region help understand the nuclear ground state properties of these heavy systems. Pioneering experiments at GSI, Darmstadt identified the first atomic transitions in the element nobelium. For the purpose of determining nuclear properties in nobelium isotopes with higher precision, a new apparatus for high-resolution laser spectroscopy in a gas-jet called JetRIS is under development. To determine the spectral resolution and the homogeneity of the gas-jet, the laser-induced fluorescence of 164Dy atoms seeded in the jet was studied. Different hypersonic nozzles were investigated for their performance in spectral resolution and efficiency. Under optimal conditions, a spectral linewidth of about 200–250 MHz full width at half maximum and a Mach number of about 7 was achieved, which was evaluated in context of the density profile of the atoms in the gas-jet.

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A gas-jet apparatus for high-resolution laser spectroscopy on the heaviest elements at SHIP

Cited by 19 publications

References 18 publications

Advancing Radiation-Detected Resonance Ionization towards Heavier Elements and More Exotic Nuclides

Advancing Radiation-Detected Resonance Ionization towards Heavier Elements and More Exotic Nuclides

Recent progress in laser spectroscopy of the actinides

Resolution Characterizations of JetRIS in Mainz Using 164Dy

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