Measurements of spin, magnetic moment, and electric quadrupole moment of 41.5 h Ir188

R. Eder, E. Hagn, and E. Zech
Phys. Rev. C 32, 582 – Published 1 August 1985
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Abstract

The techniques of nuclear orientation and nuclear magnetic resonance on oriented nuclei were applied to Ir188 after recoil implantation into Fe and Ni. Combining the results of nuclear orientation and nuclear magnetic resonance on oriented nuclei, which are sensitive to the magnetic moment and the g factor, respectively, the spin of Ir188 was determined to be I=1, in contradiction to I=2 adopted previously. In addition, the splitting of the nuclear magnetic resonance on oriented nuclei resonance into two subresonances due to quadrupole interaction was observed, which proves again I=1.

The magnetic and electric hyperfine splitting frequencies, νM=‖gμNBHF/h and νQ=e2qQ/h, were determined for Fe188, νM=315.8(3) MHz and for Ni188, νM=104.8(1) MHz, νQ=-1.98(4) MHz. Taking into account a 3% uncertainty arising from hyperfine anomalies, the magnetic moment of Ir188 is deduced to be ‖μ‖=0.302(10) μN.

With the electric field gradients of Ir in Fe and Ni, recalculated to be -0.283(6)×1017 V/cm2 and -0.151(4)×1017 V/cm2, respectively, the spectroscopic quadrupole moment of Ir188 is deduced to be +0.543(8) b. The β decay of Ir188 to the 2214 keV level in Os188 takes place to about 88% with tensor rank 0. Assuming the validity of the ξ approximation, the ratio of the remaining matrix elements is ‖V/Y‖=5.3(1.5). Our measurements show further that nuclear orientation experiments, from which γ-decay properties in Os188 have been derived, will have to be reinterpreted. In addition, the spectroscopic quadrupole moments of Ir192 and Ir194 were redetermined to be +2.28(6) b and +0.339(12) b, respectively.

  • Received 28 February 1985

DOI:https://doi.org/10.1103/PhysRevC.32.582

©1985 American Physical Society

Authors & Affiliations

R. Eder, E. Hagn, and E. Zech

  • Physik-Department, Technische Universitat München, D-8046 Garching, Federal Republic of Germany

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Issue

Vol. 32, Iss. 2 — August 1985

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