Status and development of the MARA low-energy branch

Papadakis, P.; Moore, I. D.; Eronen, T.; Liimatainen, Jarkko; Kalvas, Taneli; Partanen, J.; Pohjalainen, I.; Reponen, M.; Rinta‐Antila, S.; Sarén, J.; Uusitalo, J.

doi:10.1063/1.5053355

Cited by 4 publications

(5 citation statements)

References 13 publications

(15 reference statements)

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“…In a later phase of MARA-LEB, an RFQ cooler and buncher will be introduced, reducing the achievable ion energies to the eV scale. In addition, a similar MR-TOF spectrometer as currently being commissioned at the IGISOL-4 will be installed for atomic mass measurements [17,18].…”

Section: Mara Low-energy Branchmentioning

confidence: 99%

“…has already proven to be an effective tool for the production of isotopes for research on the proton-rich side of beta stability. Its expansion, MARA-LEB, the low-energy branch of MARA, will utilize the gas cell technique and laser ionization of the recoils stopped and neutralized in flowing noble gas, providing a means to convert MeV-scale radioactive beams to low-energy ones [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Radioactive ion beam manipulation at the IGISOL-4 facility

et al. 2020

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The IGISOL-4 facility in the JYFL Accelerator Laboratory of the University of Jyvaskyla (JYFL-ACCLAB) produces low-energy radioactive ion beams, primarily for nuclear spectroscopy, utilizing an ion guide-based, ISOL-type mass separator. Recently, new ion manipulation techniques have been introduced at the IGISOL-4 including the application of the PI-ICR (Phase-Imaging Ion Cyclotron Resonance) technique at the JYFLTRAP Penning trap, as well as commissioning of a Multi-Reflection Time-Of-Flight (MR-TOF) separator/spectrometer. The successful operation of the MR-TOF also required significant improvement of the Radio-Frequency Quadrupole (RFQ) cooler and buncher device beam pulse time structure. In addition, laser ionization techniques have been developed for particular cases, for example, a hot cavity laser ion source for silver production. A new stable isotope ion source and a beam line has been introduced for tuning and calibration purposes. In addition to the installations at the IGISOL-4 facility, the extension of the vacuum-mode recoil separator MARA (Mass Analysing Recoil Apparatus), MARA-LEB (MARA Low Energy Branch) has been under development. MARA-LEB will utilize the gas-cell technique and laser ionization to convert MeV-scale radioactive beams to low-energy ones.

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Section: Mara Low-energy Branchmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radioactive ion beam manipulation at the IGISOL-4 facility

et al. 2020

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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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“…A project to build a stopping gas cell followed by a low-energy branch LEB behind MARA focal plane has also been started (see figure 6 [13]). This setup will be used to measure masses of exotic very proton rich nuclei as well as to perform variety of laser-spectroscopic studies.…”

Section: Future Plans and Conclusionmentioning

confidence: 99%