Laser spectroscopy of niobium fission fragments: first use of optical pumping in an ion beam cooler buncher

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-s...

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Bibliographic Details
Published in:Physical review letters 2009-06, Vol.102 (22), p.222501-222501, Article 222501
Main Authors: Cheal, B, Baczynska, K, Billowes, J, Campbell, P, Charlwood, F C, Eronen, T, Forest, D H, Jokinen, A, Kessler, T, Moore, I D, Reponen, M, Rothe, S, Rüffer, M, Saastamoinen, A, Tungate, G, Aystö, J
Format: Article
Language:English
Subjects:
FISSION FRAGMENTS
ION BEAMS
METASTABLE STATES
NIOBIUM 101
NIOBIUM 103
NIOBIUM 90
NIOBIUM 91
NIOBIUM 92
NIOBIUM 93
NIOBIUM 99
NUCLEAR PHYSICS AND RADIATION PHYSICS
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Summary: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 approximately 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 beta softness observed before and after N=60.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.102.222501