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Time resolved on-line nuclear orientation (TR-OLNO): Principles and a review of existing experiments

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Abstract

This paper introduces the principles of a new method of making on-line nuclear orientation (OLNO) experiments. The source is pulsed and nuclear spin lattice relaxation is observed directly through the growth of anisotropy of angular distribution of emitted radiation with time after implantation. It is shown that Time Resolved studies (TR-OLNO) are necessary if useful analysis of orientation experiments is to be possible when relaxation times and half-lives become comparable. In the application of OLNO to decays following the initial implant, use of TR-OLNO can overcome difficulties which arise when polarisation is inherited from precursors in the decay chain. Such inheritance introduces ambiguity into analysis of continuous implantation, Time Integral (TI-OLNO), data.

Two important features of the new method are discussed. TR-OLNO relaxation rates are sensitive measures of the nuclear g-factor, and combined with TI-OLNO can yield both nuclear spin and magnetic moment. A second feature is the ability to simplify complex spectra, to establish assignments of transitions to members of a decay chain with clarity and to establish the presence of long lived isomers.

Experiments performed with TR-OLNO are briefly reviewed.

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

    N. J. Stone

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Stone, N.J. Time resolved on-line nuclear orientation (TR-OLNO): Principles and a review of existing experiments. Hyperfine Interact 75, 489–518 (1992). https://doi.org/10.1007/BF02399006

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