Physical Review Letters
Author:
Keywords:
Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, LASER-SPECTROSCOPY, GROUND-STATE, NUCLEAR-STRUCTURE, CHARGE RADII, ISOTOPES, SPIN, PHYSICS, SE-83, BEAM, ZINC, nucl-ex, nucl-th, 01 Mathematical Sciences, 02 Physical Sciences, 09 Engineering, General Physics, 40 Engineering, 49 Mathematical sciences, 51 Physical sciences
Abstract:
Collinear laser spectroscopy is performed on the 79
30Zn49 isotope at ISOLDE-CERN. The existence of a
long-lived isomer with a few hundred milliseconds half-life is confirmed, and the nuclear spins and
moments of the ground and isomeric states in 79Zn as well as the isomer shift are measured. From the
observed hyperfine structures, spins I = 9/2 and I = 1/2 are firmly assigned to the ground and isomeric
states. The magnetic moment μ (79Zn) = −1.1866(10)μN, confirms the spin-parity 9=2þ with a νg−1
9=2
shell-model configuration, in excellent agreement with the prediction from large scale shell-model theories.
The magnetic moment μ (79mZn) = −1.0180(12)μN supports a positive parity for the isomer, with a wave
function dominated by a 2h-1p neutron excitation across the N = 50 shell gap. The large isomer shift
reveals an increase of the intruder isomer mean square charge radius with respect to that of the ground state,
δ