The shape transition in the neutron-rich yttrium isotopes and isomers

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• 作者：B. Cheal ; M.D. Gardner ; M. Avgoulea ; J. Billowes ; M.L. Bissell ; P. Campbell ; T. Eronen ; K.T. Flanagan ; D.H. Forest ; J. Huikari ; et al.
• 关键词：Nuclear moments ; Isotope shift ; Nuclear charge radius
• 刊名：Physics Letters B
• 出版年：2007
• 出版时间：8 February 2007
• 年：2007
• 卷：645
• 期：2-3
• 页码：133-137
• 全文大小：187 K

文摘

Laser spectroscopy has been used to study ^{86–90,92–102}Y and isomeric states of ^{87–90,93,96,97,98}Y. Nuclear charge radii differences, magnetic dipole and electric quadrupole moments have been obtained. Information on the nature of the Z≈40, N≈60 sudden onset of deformation has been derived from all three parameters. It is seen that with increasing neutron number from the N=50 shell closure that the nuclear deformation becomes increasingly oblate and increasingly soft. At N=60 a transition to a strongly deformed rigid prolate shape occurs but prior to this, although the nuclear deformation is increasing with N, a proportionate increase in softness is also observed.