# THE Rb$sup 85$-Rb$sup 86$ HYPERFINE-STRUCTURE ANAOMALY

## Abstract

The atomic beam magnetic-resonance method with separated oscillatory fields was used to measure the hyperfine structure separation and magnetic dipole moment of the isotopes Rb/sup 85/ and 18.6d Rb/sup 86/ in the /sup 2/S/sub 1/2/ electr onic ground state. Observation of the separation of a DELTA F = plus or minus 1 doublet in the intermediate field region gave the value of the moment; the minimum value of the mean doublet frequency gave the value of DELTA nu . Obserwation of another DELTA F = plus or minus 1 doublet in low field also yielded a value for plus or minus nu . Results obtained for Rb/sup 85/ are in good agreement with previously published values and indicate that transition frequencies calculated from the Briet-Rabi equation agree with experiment to at least one part per million. For Rb/sup 86/ the following values were obtained for the /sup 2/S/sup 1/4/, ground state: DELTA nu = 3946.883(2) Mc, g/sub I/ = -4.590(4) x 10/sup -4/, and mu /sub I/ = hyperfine-structure anomaly arose in part from the difference of the volume distribution of nuclear magnetism in the two nuclei and is defined as the deviation from equality of the ratio of themore »

- Authors:

- Publication Date:

- Research Org.:
- California. Univ., Berkeley. Lawrence Radiation Lab.

- OSTI Identifier:
- 4050079

- Report Number(s):
- UCRL-9130(Rev.)

- NSA Number:
- NSA-15-016412

- DOE Contract Number:
- W-7405-ENG-48

- Resource Type:
- Technical Report

- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-61

- Country of Publication:
- United States

- Language:
- English

- Subject:
- PHYSICS; ATOMIC MODELS; ATOMS; BEAMS; BREIT-RABI FORMULA; CONFIGURATION; CYCLOTRONS; DIPOLES; ELECTRONS; ELEMENTARY PARTICLES; ENERGY LEVELS; FREQUENCY; GYROMAGNETIC RATIO; HYPERFINE STRUCTURE; HYPERONS; INDEPENDENT PARTICLE MODEL; INTERACTIONS; MAGNETIC FIELDS; MAGNETIC MOMENTS; MAGNETIC RESONANCE; MATHEMATICS; MEASURED VALUES; MESONS; MODULATION; NUCLEAR MODELS; NUCLEAR THEORY; NUCLEI; NUCLEONS; ORBITS; PHOTOPRODUCTION; PIONS; PRODUCTION; RUBIDIUM 85; RUBIDIUM 86; SPIN; SYNCHROCYCLOTRONS; SYNCHROTRONS; VOLUME

### Citation Formats

```
Braslau, N, Brink, G O, and Khan, J M.
```*THE Rb$sup 85$-Rb$sup 86$ HYPERFINE-STRUCTURE ANAOMALY*. United States: N. p., 1960.
Web.

```
Braslau, N, Brink, G O, & Khan, J M.
```*THE Rb$sup 85$-Rb$sup 86$ HYPERFINE-STRUCTURE ANAOMALY*. United States.

```
Braslau, N, Brink, G O, and Khan, J M. Mon .
"THE Rb$sup 85$-Rb$sup 86$ HYPERFINE-STRUCTURE ANAOMALY". United States.
```

```
@article{osti_4050079,
```

title = {THE Rb$sup 85$-Rb$sup 86$ HYPERFINE-STRUCTURE ANAOMALY},

author = {Braslau, N and Brink, G O and Khan, J M},

abstractNote = {The atomic beam magnetic-resonance method with separated oscillatory fields was used to measure the hyperfine structure separation and magnetic dipole moment of the isotopes Rb/sup 85/ and 18.6d Rb/sup 86/ in the /sup 2/S/sub 1/2/ electr onic ground state. Observation of the separation of a DELTA F = plus or minus 1 doublet in the intermediate field region gave the value of the moment; the minimum value of the mean doublet frequency gave the value of DELTA nu . Obserwation of another DELTA F = plus or minus 1 doublet in low field also yielded a value for plus or minus nu . Results obtained for Rb/sup 85/ are in good agreement with previously published values and indicate that transition frequencies calculated from the Briet-Rabi equation agree with experiment to at least one part per million. For Rb/sup 86/ the following values were obtained for the /sup 2/S/sup 1/4/, ground state: DELTA nu = 3946.883(2) Mc, g/sub I/ = -4.590(4) x 10/sup -4/, and mu /sub I/ = hyperfine-structure anomaly arose in part from the difference of the volume distribution of nuclear magnetism in the two nuclei and is defined as the deviation from equality of the ratio of the hyperfine-splitting factors of two isotopes to the ratio of their nuclear g factors. For these two isotopes its value was found to be /sup 85/ DELTA /sup 86/ = 0.17(9)%. The Bohr-Weisskopf theory of the hfs anomaly was applied to these isotopes with calculations based on a single particle model with varying distributions of spin and orbital contributions to the magnetic moment. (auth)},

doi = {},

url = {https://www.osti.gov/biblio/4050079},
journal = {},

number = ,

volume = ,

place = {United States},

year = {1960},

month = {8}

}