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RATIOS OF RELATIVE ABUNDANCE, MAGNETIC MOMENTS, AND CAPTURE CROSS SECTIONS OF GADOLINIUM ISOTOPES FROM PARAMAGNETIC RESONANCE SPECTRUM

Journal Article · · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
Precision measurements on the hyperfine structure of the transitions corresponding to DELTA M = 4 of the cubicfield paramagnetic resonance spectrum of gadolinium in single crystals of thorium oxide yield the following values of isotopic abundance: even isotopes, 69.45%; Gd/sup 155/, 15.05 plus or minus 0.2%; Gd/sup 157/, 15.5 plus or minus 0.2%. Ratio of magnetic moments was reported to be mu /sup 155/ mu /sup 157/ = 0.7495 plus or minus 0.0045. Irradiation of crystals at the Harwell pile with a thermal neutron flux of 1.2 x 10/sup 12/ n/cm/sup 2/ sec, and a fast flux of 2.3 x 10/sup 11/ n/cm/sup 2/ sec, yields the ratio of nuclear capture cross sections alpha /sup 157/ sigma /sup 155/ = 2.82, using the above abundance values. No F-center spectrum was detected in crystals irradiated with a total neutron flux of about 10/sup 18/ n/cm/sup 2/. The paramagnetic resonance spectrum of gadolinium in irradiated crystals is unchanged, indicating negligible radiation damage in the neighborhood of the paramagnetic ions. (auth)
Research Organization:
Hebrew Univ., Jerusalem; Israel Inst. of Tech., Haifa
NSA Number:
NSA-14-000967
OSTI ID:
4218607
Journal Information:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 115; ISSN PHRVA
Country of Publication:
Country unknown/Code not available
Language:
English