• Crystal shape effect on nuclear orientation thermometry at ultra-low temperatures

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    • Keywords


      Ultra-low temperatures; nuclear orientation thermometry; closure domains

    • Abstract


      Absolute temperature measurement (T < 100 mK region) from anisotropy of gamma radiations emitted from oriented60Co nuclei in a single crystal of hcp cobalt is found to depend on the shape of the crystal. This dependence is attributed to some closure magnetic domains not oriented along thec-axis of the disc shaped crystal studied. A long rectangular strip of cobalt crystal is found to give correct angular distribution ofγ-radiations and, therefore, suitable for thermometry.

    • Author Affiliations


      T S Radhakrishnan1 Girish Chandra1

      1. Tata Institute of Fundamental Research, Bombay - 400005
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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