Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268

Thu., October 21, 2004, at ...

***CANCELED*** The Resonance Laser Ion Source

V.N. Fedosseev, CERN, Geneva, Switzerland

PRODUCTION OF RADIOACTIVE ION BEAMS AND ISOMER SEPARATION AT ISOLDE/CERN WITH The ISOLDE on-line isotope separation facility resonance ionisation laser ion source (RILIS) is based on the method of step-wise resonance ionization of atoms in a hot metal cavity. Using a system of dye lasers pumped by a copper-vapour laser, ion beams of 23 chemical elements have been produced at ISOLDE with ionization efficiencies from a few to 27%. The high selectivity of the resonance ionization process is an important asset for the study of short-lived nuclides produced in targets irradiated with proton beams from the CERN Booster accelerator. Radioactive ion beams of Be, Mg, Al, Mn, Ni, Cu, Zn, Ga, Ag, Cd, In, Sn, Tb, Yb, Tl, Pb and Bi have been generated with the RILIS. Setting the RILIS laser in the narrow line-width mode provides conditions for high-resolution studies of hyperfine structure and isotopic shifts of atomic lines in short-lived isotopes. Selective ionization of isomers of Cu, Ag and Pb isotopes has been achieved by appropriate tuning of the laser wavelength.