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# Laser Spectroscopy of Niobium Fission Fragments: First Use of Optical Pumping in an Ion Beam Cooler Buncher

Cheal, B and Baczynska, K and Billowes, J and Campbell, P and Charlwood, F.C and Eronen, T and Forest, T.H and Jokinen, A and Kessler, T and Moore, I.D and Reponen, M and Rothe, T and Rueffer, M and Saastamoinen, A and Tungate, G and Aeysto, J (2009) Laser Spectroscopy of Niobium Fission Fragments: First Use of Optical Pumping in an Ion Beam Cooler Buncher. Physical Review Letters (PRL), 102. ISSN 0031-9007

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URL of Published Version: http://prl.aps.org/abstract/PRL/v102/i22/e222501

Identification Number/DOI: http://dx.doi.org/10.1103/PhysRevLett.102.222501

A new method of optical pumping in an ion beam cooler buncher has been developed to selectively enhance ionic metastable state populations. The technique permits the study of elements previously inaccessible to laser spectroscopy and has been applied here to the study of Nb. Model independent mean-square charge radii and nuclear moments have been studied for $$^{90,90 m,91,91 m,92,93,99,101,103}$$Nb to cover the region of the N=50 shell closure and N≈60 sudden onset of deformation. The increase in mean-square charge radius is observed to be less than that for Y, with a substantial degree of β softness observed before and after N=60.

Type of Work: Article 05 June 2009 (Publication) Colleges (2008 onwards) > College of Engineering & Physical Sciences School of Physics and Astronomy QC Physics University of Birmingham American Physical Society 374 YES

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