The spin of neon-21 has been shown to be 3/2 by the atomic beam magnetic resonance method utilizing the metastable 2p*Zs z Pi state of neon. The assignment is made from a comparison of Zeeman frequencies in neon-20 and neon-21 at the same magnetic field.

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The atomic hyperfine structure of Plutonium-239 has been investigated by the atomic-beam magnetic resonance method. Research has centered about a relatively highly populated electronic energy level having unit angular momentum which is probably the first excited state of a ground-state 7 F 60 2 term arising from the configuration (5f) (6d) (7s) .. From the measured hype rfine structure separation and 5f wave functions derived from a Hartree relativistic calculation, the.nuclear magnetic moment is inferred to be ± .02 ii. m. under the assumption that the J. = 1 level under investigation arises from a pure 7 F term belonging to the con-6 figuration (Sf) .

The nuclear spins of four neutron-deficient isotopes of rubidium have been determined by the atomic-beam magnetic-resonance method. The isotopes, with half-lives between 4.7 hours and 80 days, are produced in quantities of 10 13 to 10 14 atoms by alpha spallation reactions in the Berkeley 60-inch cyclotron. Detection of the beam is accomplished by allowing the neutral beam to fall on a sulfur surface at room temperature, then removing the surface from the apparatus and counting with low-background high-efficiency scintillation counters which accept K x-rays accompanying K capture and internal conversion. Since all four isotopes are made in one bombardment, the identification is important (and is the subject of a separate discussion). The experimental results are: Rb 81 ,1=3/2; Rb 82 , 7=5; Rb 83 , 7=5/2; Rb 84 , 7 = 2.

Rf ZEEMAN EFFECT IN 0 2 723 = 2.002292. Kambe and Van Vleck 26 have examined corrections to gj( 3 Pi) ca io and gj( z P2)0*10 arising from departures from Russell-Saunders coupling in atomic oxygen, motion of the nucleus, relativistic corrections, and interference of the external magnetic field with the various magnetic interactions within the atom. Their results are that corrections of -171X10 -6 and -232Measured by an atomic-beam magnetic resonance method, the hyperfme-structure separations and magnetic moments of four neutron-deficient isotopes are found to be Rb 81 , A*>=5097±13 Mc/sec, ^7=+2.05 ±0.02 nm; Rb 82 , A*>=3094.1 ±2.4 Mc/sec, /*/= +1.50±0.02 nm; Rb 83 , AJ>=3183.3±5.8 Mc/sec, M/= + 1.42±0.02 nm; Rb 84 , A?=3077.5±5.1 Mc/sec, M /= -1-32±0.02 nm.