On-Line Laser Spectroscopy
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Laser spectroscopy experiments on short-lived isotopes have provided a wealth of information on changes in the mean square charge radii and nuclear moments Much of this information is used for testing and improving nuclear models, which are used to understand processes involving exotic nuclei or exotic nuclear matter. We have studied on- line to accelerators neutron rich krypton isotopes at Brookhaven National Laboratory(BNL), and the long chain of neutron deficient isotopes of thallium at Oakridge National Laboratory(ORNL).At present we use ISAC at TRIUMF to perform collinear fast beam laser spectroscopy on the rare earth element lanthanum. Nuclear moment and isotope shift measurements provide in this way sensitive tests of nuclear sizes and deformations.
While nuclear charge distributions are by now well known, their magnetic counterpart, namely the distribution of nuclear magnetization, could so far only be observed for a few isotopes. The Bohr-Weisskopf effect in the hyperfine structure interaction of atoms quantifies this magnetization distribution, and when measured systematically for a chain of short-lived isotopes, will give in addition also information on the distribution of the neutrons, a feature of nuclear structure still not sufficiently understood. We have recently collaborated in the initial steps necessary for such systematic experimental studies of the Bohr-Weisskopf effect for short-lived isotopes on-line to the fragment separator (RIPS) at the RIKEN accelerator facility.
We have also developed an ultra sensitive variant of collinear fast beam laser spectroscopy using multi step resonant laser excitation to a Rydberg level followed by fied ionization and applied it to 85Kr detection.
- Hans A. Schuessler
- Fritz Buchinger
- Jonathan Lee
- John Crawford
- Hideki Iimura
- Jens Lassen
- Phil Levy