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On the decrease in charge radii of multi-quasi particle isomers

Authors:	ML Bissell KT Flanagan MD Gardner M Avgoulea J Billowes P Campbell B Cheal T Eronen DH Forest J Huikari A Jokinen ID Moore A Nieminen H Penttilä S Rinta-Antila B Tordoff G Tungate J Äystö

Institution:	1. School of Physics and Astronomy, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;2. Schuster Laboratory, The University of Manchester, Manchester M13 9PL, UK;3. Department of Physics, University of Jyväskylä, PB 35 (YFL) FIN-40351 Jyväskylä, Finland

Abstract:	We report changes in mean-square charge radii, δ〈r²〉 $δ 〈 r^{2} 〉$ , magnetic moments and quadrupole moments for three multi-quasi particle isomers; ^97m2Y, ^176mYb and ^178m1Hf. All the isomers are observed to display a decrease in 〈r²〉 $〈 r^{2} 〉$ compared to the lower-lying nuclear state on which the isomer is built. The decreases in 〈r²〉 $〈 r^{2} 〉$ occur despite the isomers showing increases in quadrupole moment. Possible mechanisms for the effect, which is now seen for six multi-quasi particle isomers, are discussed.

Keywords:	21 10 Ft 21 10 Ky 42 62 Fi
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