Spins, moments and mean square charge radii of 104–127In determined by laser spectroscopy

Abstract

Hyperfine structures and isotope shifts of indium isotopes in the mass range 104–127 have been measured in the atomic transitions 5 p 2 P 1 2 -6 s 2 S 1 2 (410 nm) and 5 p 2 P 3 2 -6 s 2 S 1 2 (451 nm) by collinear fast-beam laser spectroscopy. Nuclear magnetic dipole and electric quadrupole moments have been determined for 37 ground and isomeric states. The magnetic moments in the sequence of the 1 2 − isomers are found to cross the Schmidt limit. Magnetic dipole and electric quadrupole moments of the odd-odd isotopes are compared to values obtained by additivity rules. The 8 − isomers exhibit a strong change in the coupling of the h 11 2 neutrons to the collective motion. The mean square charge radii show a parabolic behavior with a maximum in the middle of the neutron shell at N = 66. This is interpreted by collective effects, which are considerably stronger than seen in the quadrupole moments or in the B(E2) values of neighbouring doubly-even nuclides.