Abstract

Fluorescent atom coincidence spectroscopy (FACS) has been used to measure the nuclear mean square radii and moments of the extremely neutron-deficient isotopes 120–124Ba. At N=65 an abrupt change in nuclear mean square charge radii is observed which can be understood in terms of the occupation of the spin-orbit partner g 7 2 5 2 [413] neutron and g 9 2 9 2 [404] proton orbitals and the consequent enhancement of the n-p interaction.

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