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: 208 Fr I = 7, 209 Fr I = 9/2, 210 Fr I = 6, 211 Fr I = 9/2, 212 Fr I = 5, 213 Fr I = 9/2, 220 Fr I = 1, 221 Fr I = 5/2 and 222 Fr I = 2. The spin values are discussed briefly in terms of current nuclear models.
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Ekström et al. (1978) studied this question.