The Circular Polarization of Gamma Radiation Following Allowed Beta Transitions

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The degree of circular polarization of gamma rays following allowed beta transitions was investigated as a function of the angle THETA /sub beta gamma / between beta-particle momentum and gamma direction and as a function of the energy of the beta particle. The anisotropy of the beta-gamma circular polarization correlation observed for pure Gamow-Teller transitions ( DELTA 1 = 1) is used to determine the validity of C/sub A/' = C/sub A/. The experimental results for Co/sup 60/ and Na/sup 22/ are W( THETA /sub beta gamma /) = 1- (0.345 plus or minus 0.019)(v/c) cos THETA /sub beta gamma … continued below

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31 pages : illustrations

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Steffen, R. M. (Rolf M.), 1922- January 1959.

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  • Main Title: The Circular Polarization of Gamma Radiation Following Allowed Beta Transitions
  • Series Title: Atomic Energy Commission Reports
  • Added Title: Atomic Energy Commission Report AECU-#

Description

The degree of circular polarization of gamma rays following allowed beta transitions was investigated as a function of the angle THETA /sub beta gamma / between beta-particle momentum and gamma direction and as a function of the energy of the beta particle. The anisotropy of the beta-gamma circular polarization correlation observed for pure Gamow-Teller transitions ( DELTA 1 = 1) is used to determine the validity of C/sub A/' = C/sub A/. The experimental results for Co/sup 60/ and Na/sup 22/ are W( THETA /sub beta gamma /) = 1- (0.345 plus or minus 0.019)(v/c) cos THETA /sub beta gamma / and W( THETA / sub beta gamma /) = 1 + (0.35 plus or minus 0.02)(v/c) cos THETA /sub beta gamma /, respectively. These values yield C/sub A/' = (1 plus or minus 0.2)C/ sub A/ . The degree of circular polarization of the gamma rays following mixed beta transitions ( DELTA I = 0) confirms the existence of V-A interference terms. For Sc/sup 46/ and Na/sup 24/ the beta-gamma circular polarization correlations, W( THETA /sub beta gamma /) = 1 + (0.24 plus or minus 0.02)(v/c) cos THETA / sub beta gamma /, and W( THETA /sub beta gamma /) = 1 + (0-07 plus or minus 0-O3)(v/c) cos THETA /sub beta beta /, were observed. From these measurements the ratios of Fermi to Gamow-Teller components for the Sc/sup 46/ beta transition, (Msub F//-M/sub GT/)/sup 2 0.13 plus or minus 0.04, and for the Nail beta transition, (M/sub F//M/sub GT/)/sup 2/ = 0.002 plus or minus 0.010, were determined. (auth)

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31 pages : illustrations

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Digitized from microopaque cards (2).

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  • Report No.: AECU-4147
  • Grant Number: AT(11-1)-122
  • SuDoc Number: Y 3.At 7:22/AECU-4147
  • Accession or Local Control No: metadc1240574
  • Archival Resource Key: ark:/67531/metadc1240574

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  • January 1959

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  • Nov. 5, 2023, 7:57 a.m.

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  • Oct. 9, 2024, 12:47 p.m.

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Steffen, R. M. (Rolf M.), 1922-. The Circular Polarization of Gamma Radiation Following Allowed Beta Transitions, report, January 1959; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1240574/: accessed June 20, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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