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The magnetic moment of103Ru

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Abstract

The nuclear magnetic moment of103Ru has been determined using the technique of low-temperature nuclear orientation on103Ru as a dilute impurity in Fe. The Fe lattice was cooled to 1.7 mK using a PrNi5 enhanced nuclear demagnetisation stage precooled with a3He−4He dilution refrigerator. The103RuFe system was observed to have a long nuclear spin-lattice relaxation time, but analysis of the relaxation indicates that the103Ru nuclei are close to thermal equilibrium with the Fe lattice at times>200 min after demagnetising. From the near thermal equilibrium anisotropy of the 497 keV γ-ray in103Rh we have deduced the nuclear magnetic moment as |μ(103Ru)|=0.18(2)μN. This value is almost independent of the choice of spinI=3/2 or 5/2 for the nucleus, but is only consistent with systematics ifI(103Ru)=3/2 and μ<0. UsingI=3/2 we obtain the E2/M1 mixing ratio of the 497 keV γ-ray as δ=−0.42(4). The sign of the anisotropy of the 610 keV γ-ray from the 650 keV level in103Rh is only consistent with an allowed β-decay to the state ifI(650 keV,103Rh)=5/2. The E2/M1 mixing ratio of the 610 keV γ-ray is then δ=+0.15(3) or +60( +∞−40 ), <−80. From the initial rise in γ-ray anisotropy following demagnetisation we determine the Korringa constant for103RuFe to beC=5.7(5) K·s.

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  1. D. W. Murray

    Present address: Norman Bridge Laboratory of Physics 161-33, California Institute of Technology, 91125, Pasadena, Ca, USA

Authors and Affiliations

  1. Mullard Cryomagnetic Laboratory, Clarendon Laboratory, Parks Road, OX1 3PU, Oxford, UK

    D. W. Murray, A. L. Allsop & N. J. Stone

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Murray, D.W., Allsop, A.L. & Stone, N.J. The magnetic moment of103Ru. Hyperfine Interact 11, 127–139 (1981). https://doi.org/10.1007/BF01026471

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