ATOMIC-BEAM INVESTIGATIONS OF ELECTRONIC AND NUCLEAR GROUND STATES IN THE RARE-EARTH REGION

Journal Article · Thu Jun 15 04:00:00 EDT 1961 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.122.1796· OSTI ID:4062024

Cabezas, A Y; Lindgren, I; Marrus, R

A number of radioactive isotopes in the rare-earth region are investigated, using the atomic-beam magneticresonance technique. The total electronic angular momentum (J) and the atomic g value (gJ) are determined for some low-lying levels in, Pm, Dy, Ho, and Er. These observations are consistent with the following ground- state assignments: PmI-- (4f)/sup 5/ (6s)/sup 2/, /sup 6/H/sub 5/2/; DyI- (4f)/sup 1//sup 0/(6s)/sup 2/, /sup 5/I/sub 8/; HoI - (4f)/sup 1//sup 1/(6s)/sup 2/, 4I/sub 15/2/; snd ErI - (4f) (6s)/sup 2/, /sup 3/H/sub 6/ . The groundlevel assignments agree with the Hund's-rule predictions, and the g values approximate the Lande values well. Experimental knowledge concerning electronic ground states in the rare-earth region is summarized. The following nuclear spin (I) values are obtained: Pm/sup 1//sup 4//sup 9/, 7/2; Pm/sup 1//sup 5//sup 1/, Gd/sup 1//sup 5//sup 9/ 3/2. Tb/sup 1//sup 6//sup 0/ 3; Dy/sup 1//sup 6//sup 5/ 7/2; Dy/sup 1//sup 6//sup 6/, 0; 27 hr Ho/sup 1//sup 6//sup 6/, 0; Er/ sup 1//sup 6//sup 9/ 1/2; Er/sup 1//sup 7//sup 1/, 5/2; and Tm/sup 1//sup 7//sup 1/, 1/2. These values are compar ed with beta-decay results. Most of these isotopes have large nuclear deformations, and the spin values are discussed in relation to the single-particle energy-level diagrams given by Nilsson. A few results are explained with the shell model. (auth)

• Research Organization: Univ. of California, Berkeley
• NSA Number: NSA-15-021572
• OSTI ID: 4062024
• Report Number(s): UCRL-9225; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 122; ISSN PHRVA
• Country of Publication: United States
• Language: English

Related Subjects

ANGULAR MOMENTUM
ATOMS
BEAMS
BETA DECAY
COLLECTIVE MODEL
DEFORMATION
DYSPROSIUM 165
DYSPROSIUM 166
ELECTRONS
ENERGY LEVELS
ERBIUM 169
ERBIUM 171
GADOLINIUM 159
GYROMAGNETIC RATIO
HOLMIUM 166
HUND RULES
MAGNETIC MOMENTS
MEASURED VALUES
MOMENTUM
MULTIPLETS
NILSSON- MOTTELSON MODEL
NUCLEAR MAGNETIC RESONANCE
NUCLEAR MODELS
NUCLEI
PHYSICS
PROMETHIUM 149
PROMETHIUM 151
RARE EARTHS
SHELL MODELS
SPIN
TERBIUM 160
THULIUM 171