Speaker
Bradley Cheal
(The University of Manchester)
Description
Collinear laser spectroscopy measurements of nuclear moments and mean-square charge
radii at JYFL have benefited from the introduction of an ion beam cooler. The
reduced energy spread of the emerging beam increases the spectral resolution while
the smaller emittance allows a narrower waist of the laser-ion overlap, thus
requiring less laser power. A lower background from the decreased continuous
scattering of laser light is further improved by pulsing the release of the ions from
the cooler. The installation of ISCOOL at ISOLDE will couple these advantages with
the higher beam intensities offered.
Axial confinement of the slowly traveling cooled ions at the end of the cooler
provides an opportunity to excite transitions and redistribute the electronic level
populations. This may be done using broad band lasers which can readily access a
wide range of wavelengths. Manipulation of state population in such a way extends
the number of transitions available for study by collinear techniques. Transitions
may be chosen on the basis of strength, preferred spins or hyperfine structure and
hindered less by the lower state population.
Author
Bradley Cheal
(The University of Manchester)
