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A facility for production and laser cooling of cesium isotopes and isomers

Authors: Giatzoglou, Alexandros; Poomaradee, Tanapoom; Pohjalainen, Ilkka; Rinta-Antila, Sami; Moore, Iain; Walker, Philip M.; Marmugi, Luca; +2 Authors

A facility for production and laser cooling of cesium isotopes and isomers

Abstract

We report on the design, installation, and test of an experimental facility for the production of ultra-cold atomic isotopes and isomers of cesium. The setup covers a broad span of mass numbers and nuclear isomers, allowing one to directly compare chains of isotopes and isotope/isomer pairs. Cesium nuclei are produced by fission or fusion-evaporation reactions using primary proton beams from a 130 MeV cyclotron impinging upon a suitable target. The species of interest is ejected from the target in ionic form, electrostatically accelerated, mass separated, and routed to a science chamber. Here, ions are neutralized by implantation in a thin foil, and extracted by thermal diffusion. A neutral vapor at room temperature is thus formed and trapped in a magneto-optical trap. Real-time fluorescence imaging and destructive absorption imaging provide information on the number of trapped atoms, their density, and their temperature. Tests with a dedicated beam of $^{133}$Cs$^{+}$ ions at 30 keV energy confirm neutralization, evaporation, and laser cooling to 150 $��$K, with an average atomic density of 10$^{10}$ cm$^{-3}$. Availability of cold and dense atomic samples of Cs isotopes and isomers opens new avenues for high-precision measurements of isotopic and isomeric shifts thereby gaining deeper insight into the nuclear structure, as well as for sensitive measurements of isotopes' concentration ratios in trace quantities. The facility also constitutes the core for future experiments of many-body physics with nuclear isomers.

11 pages; 12 figures

Countries
Finland, United Kingdom
Keywords

ultra-cold nuclei, Physics - Instrumentation and Detectors, ta114, Atomic Physics (physics.atom-ph), tutkimuslaitteet, Kiihdytinlaboratorio, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), 541, Ultra-cold nuclei, Physics - Atomic Physics, laser cooling, Accelerator Laboratory, Laser cooling, Isotopes and isomers, Nuclear Experiment (nucl-ex), ydinfysiikka, isotopes and isomers, Nuclear Experiment

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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    4
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Average
Average
Average
Green
hybrid