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

Giatzoglou, Alexandros, Poomaradee, Tanapoom, Pohjalainen, Ilkka, Rinta-Antila, Sami, Moore, Iain D., Walker, Philip M., Marmugi, Luca and Renzoni, Ferruccio (2018) A facility for production and laser cooling of cesium isotopes and isomers Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 908. pp. 367-375.

A Facility for Production and Laser Cooling of Cesium Isotopes and Isomers.pdf - Accepted version Manuscript

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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 133Cs + ions at 30 KeV energy confirm neutralization, evaporation, and laser cooling to 150 μ K, with an average atomic density of 1010 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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Giatzoglou, Alexandros
Poomaradee, Tanapoom
Pohjalainen, Ilkka
Rinta-Antila, Sami
Moore, Iain D.
Walker, Philip
Marmugi, Luca
Renzoni, Ferruccio
Date : 30 August 2018
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1016/j.nima.2018.08.095
Copyright Disclaimer : © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Uncontrolled Keywords : Laser cooling; Ultra-cold nuclei; Isotopes and isomers
Depositing User : Clive Harris
Date Deposited : 17 Sep 2018 09:57
Last Modified : 31 Aug 2019 02:08

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