Abstract

Systematic deviations were found below 0.003°K in the temperature dependence of nuclear orientation of Ce137m in cerous magnesium nitrate, using the temperature scale proposed by Daniels and Robinson. The temperature scale below 0.006°K was redetermined using a new method: nuclear orientation. This has the advantage over the 'Y-ray heating method of high sensitivity at the lowest temperature. The most striking result is hat a value of 1/T of 520, rather than the previously accepted 324, is obtained by demagnetization from initial condItions of 18.8 kG deg-1. The useful absolute temperature range is thus extended by at least 60% in 1/T. Auxiliary experiments on oriented Pm144 gave similar results and provided independent confirmation both of the inadequacy of the old temperature scale and of the validity of the new one.

Disciplines

Physics

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This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society. The following article appeared in Physical Review.

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URL: http://digitalcommons.calpoly.edu/phy_fac/195