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.

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