Precision laser and microwave spectroscopy of radioactive Be isotopes provided from a projectile fragment separator RIPS
Abstract
Radioactive Be isotope beams from RIKEN RIPS at approximately 1 GeV were thermalized in an RF ion guide gas cell and extracted by a combination of DC and inhomogeneous RF electric fields. The extracted ions were transported via a carbon-OPIG to a linear RF trap located in UHV environment. They were further cooled down to 10-6 eV by laser cooling for precision atomic spectroscopy. The ground state hyperfine splitting of ^7Be and ^11Be were measured directly with accuracies of 10-7 by microwave-laser double resonance method. The optical transition frequencies for 2s1/2-2p3/2 transition of ^7Be, ^9Be, ^10Be, and ^11Be ions were also measured with accuracies of 10-9 by laser-laser double resonance method. These experiments aim to independently measure the nuclear charge and magnetization radii by the isotope shift and the Bohr-Weisskpf effect, respectively, especially for one neutron halo nucleus ^11Be. We discuss the RF-carpet ion guide technique and the results of spectroscopy experiments.
- Publication:
-
APS Meeting Abstracts
- Pub Date:
- October 2009
- Bibcode:
- 2009APS..HAW.BE004T