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Reduction in Nuclear Size and Quadrupole Deformation of High-Spin Isomers of ^{127,129}In
A R Vernon1,2,3, C L Binnersley1, R F Garcia Ruiz2,4
1The University of Manchester, Department of Physics and Astronomy, Manchester M13 9PL, United Kingdom.
Abstract:
We employed laser spectroscopy of atomic transitions to measure the nuclear charge radii and electromagnetic properties of the high-spin isomeric states in neutron-rich indium isotopes (Z=49) near the closed proton and neutron shells at Z=50 and N=82. Our data reveal a reduction in the nuclear charge radius and intrinsic quadrupole moment when protons and neutrons are fully aligned in ^{129}In(N=80), to form the high spin isomer. Such a reduction is not observed in ^{127}In(N=78), where more complex configurations can be formed by the existence of four neutron holes. These observations are not consistently described by nuclear theory.
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