Nuclear Ground State Spins of the Francium Isotopes^{208-213, 220-222}Fr

Abstract

The nuclear ground state spins of some francium isotopes have been measured using on-line atomic-beam magnetic resonance techniques. The following results have been obtained: 208Fr I = 7, 209Fr I = 9/2, 210Fr I = 6, 211Fr I = 9/2, 212Fr I = 5, 213Fr I = 9/2, 220Fr I = 1, 221Fr I = 5/2 and 222Fr I = 2. The spin values are discussed briefly in terms of current nuclear models.