First application of the Laser Ion Source and Trap (LIST) for on-line experiments at ISOLDE

Fink, D.; Richter, Sven; Bastin, B.; Blaum, Klaus; Catherall, R.; Cocolios, T. E.; Fedorov, D. V.; Fedosseev, V. N.; Flanagan, Kieran; Ghys, L.; Gottberg, A.; Imai, N.; Kron, T.; Lecesne, N.; Lynch, K. M.; Marsh, B. A.; Mendonça, Tânia; Pauwels, D.; Rapisarda, E.; Ramos, J.P.; Rossel, R. E.; Rothe, S.; Seliverstov,; Sjödin, Marica; Stora, T.; Beveren, C. Van; Wendt, Κ.

doi:10.1016/j.nimb.2013.06.039

Cited by 25 publications

(41 citation statements)

References 14 publications

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“…It has been observed in previous studies that the efficiency of the laser ionization in the LIST mode is lower than in the ion-guide mode [31,36]. The losses are mostly due to the reduced spatial overlap of the atomic flux and the laser beams inside the LIST cavity in contrast to the 3-mm-diameter hot cavity that is used in normal RILIS operation or in ion-guide mode.…”

Section: Laser Ionizationmentioning

confidence: 93%

“…For a more detailed description of the technical aspects of the LIST and a summary of the performance during this and earlier on-line tests, we refer to Refs. [31,36].…”

Section: Listmentioning

confidence: 99%

“…5. However, this number is also dependent on the proton current on target, relating to the total number of charged particles in the hot cavity, and on the size and space position of laser beams [36]. In other measurements, loss factors of 10 and 20 are measured for polonium and magnesium, respectively.…”

Section: Laser Ionizationmentioning

confidence: 99%

“…We reported recently on the technical aspects of the first successful use of the LIST at ISOLDE for on-line production of radioisotopes from a uranium-based target with an improved laser ionization efficiency of a factor of 2.5 leading to a reduced loss of the beam of interest of only a factor of 20 [36]. We present here a performance study of the LIST for nuclei in the region of Z > 82 and N > 126 and its suitability for the study of nuclear ground-state properties.…”

Section: Introductionmentioning

confidence: 99%

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In-Source Laser Spectroscopy with the Laser Ion Source and Trap: First Direct Study of the Ground-State Properties ofPo217,219

Fink¹,

Cocolios²,

Andreyev³

et al. 2015

Phys. Rev. X

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A Laser Ion Source and Trap (LIST) for a thick-target, isotope-separation on-line facility has been implemented at CERN ISOLDE for the production of pure, laser-ionized, radioactive ion beams. It offers two modes of operation, either as an ion guide, which performs similarly to the standard ISOLDE resonance ionization laser ion source (RILIS), or as a more selective ion source, where surface-ionized ions from the hot ion-source cavity are repelled by an electrode, while laser ionization is done within a radiofrequency quadrupole ion guide. The first physics application of the LIST enables the suppression of francium contamination in ion beams of neutron-rich polonium isotopes at ISOLDE by more than 1000 with a reduction in laser-ionization efficiency of only 20. Resonance ionization spectroscopy is performed directly inside the LIST device, allowing the study of the hyperfine structure and isotope shift of 217 Po for the first time. Nuclear decay spectroscopy of 219 Po is performed for the first time, revealing its half-life, α-to-β-decay branching ratio, and α-particle energy. This experiment demonstrates the applicability of the LIST at radioactive ion-beam facilities for the production and study of pure beams of exotic isotopes.

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Section: Laser Ionizationmentioning

confidence: 93%

“…For a more detailed description of the technical aspects of the LIST and a summary of the performance during this and earlier on-line tests, we refer to Refs. [31,36].…”

Section: Listmentioning

confidence: 99%

Section: Laser Ionizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In-Source Laser Spectroscopy with the Laser Ion Source and Trap: First Direct Study of the Ground-State Properties ofPo217,219

Fink¹,

Cocolios²,

Andreyev³

et al. 2015

Phys. Rev. X

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“…Efforts are ongoing for developing the so-called Laser Ion Source Trap (LIST), with the aim of repelling surface-ionized contaminants before performing the laser ionization of the nuclides of interest in a quadrupole ion guide. Preliminary tests at ISOLDE show promising results [Fin13].…”

Section: Production and Preparation Of The Ion Ensemblementioning

confidence: 96%

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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In‐Source High‐Resolution Spectroscopy Using an Integrated Tunable Raman Laser

Granados,

Stoikos,

Bernerd

et al. 2023

Laser & Photonics Reviews

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Tunable single‐frequency lasers are the most prominent tool for high‐resolution spectroscopy, allowing for the study and exploitation of the electronic structure of atoms. A significant milestone relies on the demonstration of integrated laser technology for performing such a task. The device presented here is composed of a compact Fabry–Perot monolithic resonator capable of producing tunable and Fourier‐limited nanosecond pulses with a MHz‐class frequency stability without active cavity stabilization elements. It also has the remarkable capability of exploiting the Raman effect to funnel efficiently the broad spectrum of an input laser to a spectrally‐bright Stokes pulse at hard‐to‐access wavelength ranges. The targeted atom for the demonstrations is 152Sm, released as an atomic vapor in a hot cavity environment. Here, the Stokes field is tuned to a wavelength of 433.9 nm, while a crossed‐beams spectroscopy setup is used to minimize the Doppler broadened spectral features of the atoms. With this work, the suitability of integrated diamond Raman lasers as a high‐resolution in‐source spectroscopy tool is demonstrated, enabling many applications in atomic and nuclear physics. The integrated form‐factor and inherent simplicity makes such a laser an interesting prospect for quantum‐technology based sensing systems and related applications.

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First application of the Laser Ion Source and Trap (LIST) for on-line experiments at ISOLDE

Cited by 25 publications

References 14 publications

In-Source Laser Spectroscopy with the Laser Ion Source and Trap: First Direct Study of the Ground-State Properties ofPo217,219

In-Source Laser Spectroscopy with the Laser Ion Source and Trap: First Direct Study of the Ground-State Properties ofPo217,219

Binding Energy of Strongly Deformed Radionuclides

In‐Source High‐Resolution Spectroscopy Using an Integrated Tunable Raman Laser

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