Abstract
Polarized116In nuclei have been produced by capture of polarized thermal neutrons in several In compounds. At temperaturesT below 77 °K and magnetic field strengthsH 0 of several kOe, asymmetries of a few percent of the β− decay of the116In ground state could be observed in polycrystalline InP, InAs and InSb, thus indicating the nuclear polarization. Nuclear magnetic resonance signals have been measured with the result for the magnetic moment μ i (116In)=2.7723 (10) nm (uncorrected). β− decay asymmetry and spin lattice relaxation timeT 1 have been studied as a function ofH 0 andT. The effect ofH 0 is to decouple the hyperfine interaction caused by the capture-γ recoil process. However,H 0 has no influence uponT 1, which demonstrates the absence of nuclear relaxation due to paramagnetic impurities.T 1 is determined by quadrupolar relaxation. A quadrupole momentQ(116In)=0.09 (2) b was calculated by comparison of the116In relaxation rates with those of the stable115In isotope in the same compounds. Above 30 °K the temperature dependence of 1/T 1 agrees with a recent theoretical investigation. Below 30 °K the relaxation rate shows an anomalous behaviour, which can be explained by resonance modes due to recoil lattice defects.
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This paper is dedicated to the memory of Jost Mertens who died August 4, 1970 in a mountaineering accident.
It is a pleasure to the authors to express their thanks to Prof. G. zu Putlitz for his helpful advice and encouragement in starting this experiment and for reading the manuscript. We are indebted to Prof. K. H. Beckurts for his constant support of this work. We are grateful to Prof. B. Povh and Prof. J. Heintze for valuable suggestions. We wish to thank Dipl.-Ing. W. Farr and Feinmechanikermeister E. Ehrbar for their assistance with the electronic and mechanical equipment, and the many members of the staff of the Reaktorbetrieb who helped to make these experiments possible. Dr. R. Gremmelmaier and Dipl.-Ing. E. Nitsche of the Siemens-Schuckert Forschungslaboratorium Erlangen generously supplied the InAs and InSb samples.
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Winnacker, A., Ackermann, H., Dubbers, D. et al. Relaxation phenomena and nuclear magnetic resonance of116In(T 1/2=14s) produced by capture of polarized neutrons in the indium III–V compounds. Z. Physik 244, 289–311 (1971). https://doi.org/10.1007/BF01396789
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DOI: https://doi.org/10.1007/BF01396789