Abstract
The magnetic and electric hyperfine splitting frequencies ¦gμ N B HF/h¦ ande 2 qQ/h of the 5/2−1/2[541] ground state of 14h 185Ir in Ni were measured with nuclear magnetic resonance on oriented nuclei to be 360.8(7) MHz and +6.7(2.0) MHz, respectively. The ground state magnetic dipole moment and electric quadrupole moment of185Ir are deduced to be ¦μ¦=2.601 (14)μ N andQ=−1.9(5)b, taking values for the hyperfine field and electric field gradient of BHF=−454.9 (2.3) kG and eq=−0.151(4) × 1017 V/cm2, respectively. The negative quadrupole moment is in agreement with nuclear-orientation data and proves again theI π K=5/2− 1/2 ground state configuration.
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We are indebted to Prof. P. Kienle and Prof. H.-J. Körner for their continuous interest and support of this work. We also wish to thank Dr. P. Maier-Komor and E. Kellner for the preparation of the Re and Ni foils, Dr. H. Schweickert, K. Assmus and the Karlsruhe cyclotron crew for the irradiations, E. Smolic and J. Hesol for experimental help and Prof. B. Turrell and K.-H. Ebeling for discussions. This work was supported by the Bundesministerium für Forschung und Technologie, Bonn, and, partly, by the Kernforschungszentrum, Karlsruhe, and the Walther Meißner Institut für Tieftemperaturforschung, Garching.