THE HYPERFINE STRUCTURE AND NUCLEAR MOMENTS OF $sup 143$Nd AND $sup 145$Nd

Journal Article · Tue Jan 01 04:00:00 EST 1963 · Proc. Phys. Soc. (London)

DOI:https://doi.org/10.1088/0370-1328/81/1/322· OSTI ID:4694730

Spalding, I J

The atomic-beam inagnetic-resonance technique was used to measure the hyperfine structure of the stable isotopes, Nd/sup 143/ and Nd/sup 145/ in the ground state 4f/sup 4/, 5I/sub 4/, and of Nd/sup 145/ in the metastable atomic state /sup 5/I/sub 5/. The values of the magnetic dipole and electric quadrupole interaction constants A and B are, for Nd/sup 143/, A(/sup 5/I/sub 4/) = - 195.649(9) Mc/s, B(/sup 5/I/sub 4/) = +122.25(28) Mc/s, and for Nd//sup 145/, A(/ sup 5/I/su b 4/) = g/sub j/ measurements for the /sup 5/I multiplet indicated that the valence electrons were adequately described by RussellSaunders coupling within a single configuration, and so Nierenberg's formulas for the hyperfine structure of a Hund's Rule ground term of equivalent electrons were used to calculate A(/sup 5/I/sub 5/)/A(/sup 5/I/sub 4/) = +0.79129 and B(/sup 5/I/sub 5/)/ B(/sup 5/I/sub 4/) = +0.9390. These ratios agree well with experimental values. For (r/sup -3/)/sub 4f/ = 28.6 A/sup -3/ ( 450 deg C in a 10%), /sup 143/ = - 1.25(13) n.m. , /sup 145/ = -0.78(8) n.m., Q/sup 143/ = -0.57(6) bn and Q/ sup 145/ = -0.30(3) bn, where the moments are not corrected for core polarization effects and the errors given in parenthesis are those due to the uncertainty in ( r/sup -3/) only. Neglecting hyperfine structure anomalies, which should be small for 4f configurations, the ratios /sup 143// /sup 145/ = +1.60860(36) and Q/sup 143//Q/sup 145/ = +1.8 93(16) can be deduced from our measurements of A and B. Existing theoretical work accounts adequately for the dipole ratio, but not for the measured ratio of the quadrupole moments. (auth)

• Research Organization: Cavendish Lab., Cambridge, Eng.
• NSA Number: NSA-17-021068
• OSTI ID: 4694730
• Journal Information: Proc. Phys. Soc. (London), Journal Name: Proc. Phys. Soc. (London) Vol. Vol: 81
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR MOMENTUM
ATOMS
BEAMS
BINDING ENERGY
CONFIGURATION
ELECTRIC MOMENTS
ELECTRONS
ENERGY LEVELS
ERRORS
HUND RULES
HYPERFINE STRUCTURE
INTERACTIONS
ISOTOPES
L-S COUPLING
MAGNETIC MOMENTS
MAGNETIC RESONANCE
MEASURED VALUES
METASTABLE STATES
MOMENTUM
MULTIPLETS
NEODYMIUM 143
NEODYMIUM 145
NUCLEAR MODELS
ORBITS
PHYSICS
POLARIZATION
SPIN