Nuclear moments of secondary beams from a recoil mass spectrometer
Thesis/Dissertation
·
OSTI ID:102587
Static magnetic dipole and electric quadrupole moments of nuclear isomers were measured using secondary beam techniques. The isomers were produced by heavy-ion fusion evaporation reactions and formed into secondary beams by the Rochester recoil mass spectrometer (RMS). These isomer beams were oriented and stopped in a perturbing environment. Perturbed angular distributions of the isomers` decay radiations were observed to extract the nuclear moments. Three distinct studies were made using variations of this general technique. The preservation, following separation by the RMS, of reaction-induced nuclear alignment for Ar-like {sup 60}Ge and Ne-like {sub 54}Fe ions was established. The degree of alignment observed is estimated to be roughly 25% of the initial alignment. Electric quadrupole moments of polarized {sup 92}Mo(8{sup +}) and {sup 93}Ru(21/2{sup +}) isomers were measured. The sign of Q{sub 92Mo} was found to be negative, indicating that the state is of a proton particle rather than hole character. Q{sub 93Ru} was found to be +0.03(1)b. This result is consistent with the isomer`s small B(E2,21/2{sup +} {yields} 17/2{sup +}) but is not well predicted by shell-model calculations. The third experiment, which has not yet been completed, is an application of the {beta}-NMR technique to a measurement of the magnetic dipole moment of {sup 23}Mg. A preliminary result of {vert_bar}{mu}{sub 23Mg}{vert_bar} = 0.536(13) {mu}{sub N} has been obtained.
- Research Organization:
- Rochester Univ., NY (United States)
- OSTI ID:
- 102587
- Country of Publication:
- United States
- Language:
- English
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