Nuclear magnetic resonance of beta-unstable nuclei produced in polarized triton and proton reactions

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5003174

Westervelt, R T

The polarized-beam {beta}-NMR technique uses an incident polarized ion beam as a source of polarization which is transferred to the residual nucleus in a nuclear reaction. The nuclear polarization of the implanted residual nucleus is maintained in an external static magnetic field and detected by the directional asymmetry of the electrons or positrons emitted during the subsequent {beta}-decay. The frequency of a radio frequency magnetic field at which the resonant depolarization destroys the {beta}-decay asymmetry is used to measure the nuclear magnetic dipole moment. The ground state nuclear magnetic moments of {sup 12}B, {sup 39}Ca and {sup 25}Al were measured in a systematic and self-consistent manner relative to the proton moment and to the {sup 8}Li moment using the polarized beam {beta}-NMR technique. An NMR response was found at twice the normal Zeeman frequency for {sup 12}B in an amorphous {sup 13}C target. This resonance is attributed to the mixing of the {sup 12}B spin substates in the large electric quadrupole field in the amorphous {sup 13}C sample. The polarized triton and proton beams at the Los Alamos National Laboratory were used to conduct an extensive search for candidates for magnetic moment measurements with the {beta}-NMR technique. Small {beta}-decay asymmetries were found for {sup 16}N in a target of titanium nitride and {sup 23}Mg in potassium bromide. However, the magnetic moments of these nuclei could not be measured because of instabilities in the ion beam.

• Research Organization: Stanford Univ., CA (USA)
• OSTI ID: 5003174
• Country of Publication: United States
• Language: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ALUMINIUM 25
ALUMINIUM ISOTOPES
BEAMS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BORON 12
BORON ISOTOPES
CALCIUM 39
CALCIUM ISOTOPES
DATA
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
INFORMATION
ISOTOPES
LIGHT NUCLEI
MAGNETIC MOMENTS
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
MEASURING METHODS
NUCLEAR MAGNETIC MOMENTS
NUCLEAR MAGNETIC RESONANCE
NUCLEAR PROPERTIES
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
POLARIZED BEAMS
RADIOISOTOPES
RESONANCE
SECONDS LIVING RADIOISOTOPES