J. Phys. Colloques
Volume 48, Numéro C7, Décembre 19871st International Laser M2P Conference
|Page(s)||C7-679 - C7-681|
J. Phys. Colloques 48 (1987) C7-679-C7-681
MEASUREMENT OF THE NUCLEAR gI FACTOR BY LASER OPTICAL PUMPING AND LARMOR PRECESSION IN A FAST ATOMIC BEAMJ.L. VIALLE, M. CARRE, J. LERME and M. PELLARIN
Laboratoire de Spectrométrie Ionique et Moléculaire, (CNRS UA-171 et Celphyra), Université Claude Bernard Lyon-I, 43, Bd du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France
The extraction of the nuclear dipolar magnetic moment [MATH]n from the hyperfine structure constants requires the calculation of the electronic contribution and this limits the accuracy which moreover depends on the hyperfine anomaly. To overcome these difficulties, we present an original method of determining the nuclear Landé factor gI for diamagnetic atoms. This new technique is illustrated with two experiments using respectively the odd-A isotopes 135,137Ba (I = 3/2 - test experiment /1/) and the odd-A isotopes 213,225Ra (I = 1/2 - this experiment was carried out at C.E.R.N. on line with the ISOLDE mass separator). The method, based on the fast atomic beam laser spectroscopy technique, consists of detecting the in-flight Larmor precession of the nuclear magnetic moment in a static field, via the fluorescence induced by a resonant laser light.