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

Abstract

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.

References

Page 1

	Year	Citations
Spectroscopic nuclear quadrupole moments Pekka Pyykkö Molecular Physics	2001	532
Development and applications of the IGISOL technique J. Äystö Nuclear Physics A Sample PreparationAnalytical ChemistryIgisol TechniqueExperimental Methods	2001	278
Equilibrium shapes and high-spin properties of the neutron-rich A ≈ 100 nuclei J. Skalski, S. Mizutori, W. Nazarewicz Nuclear Physics A Nuclear DynamicsSpin DynamicExperimental Nuclear PhysicsNuclear PhysicsPhysics	1997	186
Laser Spectroscopy of Cooled Zirconium Fission Fragments P. Campbell, H. L. Thayer, J. Billowes, Physical Review Letters	2002	152
Medium-spin structure of 96,97Sr and 98,99Zr nuclei and the onset of deformation in the region W. Urban, J. L. Durell, A. G. Smith, Nuclear Physics A EngineeringNuclear PhysicsNuclear StructurePhysicsNatural Sciences	2001	132
First Precision Mass Measurements of Refractory Fission Fragments U. Hager, T. Eronen, J. Hakala, Physical Review Letters	2006	126
The shape transition in the neutron-rich yttrium isotopes and isomers B. Cheal, Michael D. Gardner, M. Avgoulea, Physics Letters B EngineeringNuclear PhysicsPhysicsNatural SciencesIsotope Geochemistry	2006	103
Nuclear core densities, isotope shifts, and the parametrization of the droplet model D. B. Berdichevsky, F. Tondeur The European Physical Journal A Isotope ShiftsNuclear PhysicsPhysicsNatural SciencesIsotope Geochemistry	1985	94
Precision mass measurements of neutron-rich yttrium and niobium isotopes U. Hager, A. Jokinen, V.-V. Elomaa, Nuclear Physics A Niobium IsotopesNuclear PhysicsPhysicsNatural SciencesNeutron Source	2007	82
Nuclear Gyromagnetic Ratios. III Robert E. Sheriff, Dudley Williams Physical Review MagnetismChart RecorderMagnetic Resonance FrequenciesExperimental Nuclear PhysicsNuclear Physics	1951	77

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