MEASUREMENT OF THE NUCLEAR gI FACTOR BY LASER OPTICAL PUMPING AND LARMOR PRECESSION IN A FAST ATOMIC BEAM

J.L. VIALLE; M. CARRE; J. LERME; M. PELLARIN

doi:doi:10.1051/jphyscol:19877165

Issue		J. Phys. Colloques Volume 48, Number C7, Décembre 1987 1^st International Laser M2P Conference


Page(s)		C7-679 - C7-681
DOI		https://doi.org/10.1051/jphyscol:19877165

1^st International Laser M2P Conference

J. Phys. Colloques 48 (1987) C7-679-C7-681
DOI: 10.1051/jphyscol:19877165

MEASUREMENT OF THE NUCLEAR g_I FACTOR BY LASER OPTICAL PUMPING AND LARMOR PRECESSION IN A FAST ATOMIC BEAM

J.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

Abstract
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 g_I 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.