The Measurement of Magnetic Moments of Excited States in Palladium, Tungsten, and Thulium Nuclei

Citation

Kaufmann, Elton Neil (1969) The Measurement of Magnetic Moments of Excited States in Palladium, Tungsten, and Thulium Nuclei. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/85AT-X002. https://resolver.caltech.edu/CaltechTHESIS:06082017-112608016

Abstract

The perturbed gamma - gamma angular correlation technique has been used to measure the magnetic moments of several nuclear excited states. The magnetic moment of the second excited 2⁺ state in ¹⁰⁶Pd has been measured to be μ = 0.74 ± 0.14 nm, in good agreement with the interpretation of that state as a two-phonon quadrupole vibration about spherical equilibrium. The magnetic moment of the two-quasiparticle 2^- state at 1289 keV in ¹⁸²W has been measured to be μ = 1.04 ± 0.24 nm) in poor agreement with the predictions of the "strong-coupling" approximation. The probable origin of the discrepancy is discussed. The following magnetic moments in odd-mass thulium nuclei have been measured: the 5/2⁺ level at 118.2 keV in ¹⁶⁹Tm with μ 0.79 ± 0.08 nm; the 7/2⁺ level at 138.9 keV in ¹⁶⁹Tm with μ = 1.33 ± 0.07 nm; the 5/2⁺ level at 116.7 keV in ¹⁷¹Tm with μ 0.81 ± 0.37 nm; and the 7/2⁺ level at 129.1 keV in ¹⁷¹Tm with μ = 1.44 ± 0.14 nm. In addition, the multipole mixing amplitude for the 109.8 keV transition in ¹⁶⁹Tm has been measured to be δ(E2/M1) = -0.15 ± 0.02) and the crossover-to-cascade transition intensity ratios for the 5/2⁺(116.7 keV) and 7/2⁺(129.1 keV) states in ¹⁷¹Tm have been measured to be I_γ (5/2 → 1/2)/I_γ(5/2 → 3/2) = 0.115 ± 0.005 and I_tot(7/2 → 3/2)/I_tot(7/2 → 5/2) = 3.22 ± 0.58, respectively. The results of the measurement in the thulium nuclei have been us ed in conjunction with other data to determine the parameters in the rotational model description of the nuclei. The magnetic parameters are interpreted in terms of transverse and longitudinal spin polarization effects; where only qualitative agreement with theory is found. A correction to the rotational model predictions of electric quadrupole transition rates is also discussed.

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