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Determination of the g-factor for several short-lived nuclear states

Citation

Rogers, John David (1961) Determination of the g-factor for several short-lived nuclear states. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechTHESIS:04132011-071706545

Abstract

The g-factors of nine excited nuclear states have been measured by observing the rotation of the angular correlation of a γ-γ cascade in a magnetic field whose direction was alternately switched up and down with respect to the plane of the measurement. The results are: 280-kev state of As^(75) (τ = 4 x 10^(-10) sec) g = (0.39 ± 0.12); 9l-kev state of pm^(147) (τ = 3.4 x 10^(-9) sec) g = (0.93 ± 0.20)/ G_2 where G_2 is between 0.5 and 1.0 ; 118-kev state of Tm^(169) (τ = 9.0 x 10^(-11) sec) g = (0.21 ± 0.07) ; 114-kev state of Lu^(175) (τ = 9.4 x 10^(-11) sec) g = (0.65 ± 0.25); 113-kev state of Hf^(177) (τ = 7 x 10^(-10) sec) g = (0.20 ± 0.06) ; l22-kev state of Sm^(152) (τ = 2.0 x 10^(-9) sec) g = (0.28 ± 0.07); 123-kev state of Gd^(154) (τ = 1.7 x 10^(-9) sec) g = (0.4 ± 0.5); 87-kev state of Dy^(160) (τ = 2.6 x 10^(- 9) sec) g = (0.28 ± 0.08) ; 8l-kev state of Er^(166) (τ = 2.4x 10 ^(-9) sec) g = (0.31 ± 0.06). The measurements have been compared to theoretical predictions. On the basis of the shell model, the probable value of the spin for the 9l-kev level of Pm^(147) is 5/2+. The results for Tm^(169), Lu^(175), and Hf^(177) have been interpreted using the Nilsson model. The results found are in qualitative agreement with theory, but some deviations, especially in Hf^(177), are noted. The measurements for the 2+ states 0f Sm^(152), Dy^(160), and Er^(166) provide a direct eva1uation of the rotational g-factor, g_R, of the collective model. The values found are about 3/4 of the value g_R = Z/A predicted for uniform nuclear flow. The effects of electronic paramagnetism in rare earths on these measurements are treated in an appendix. The assumptions necessary to interpret the observed rotation in terms of the g-factor are discussed.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Physics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Boehm, Felix H.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1961
Record Number:CaltechTHESIS:04132011-071706545
Persistent URL:http://resolver.caltech.edu/CaltechTHESIS:04132011-071706545
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6314
Collection:CaltechTHESIS
Deposited By: Tony Diaz
Deposited On:13 Apr 2011 17:26
Last Modified:26 Dec 2012 04:34

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