Abstract
We review a series of experiments on time reversal invariance in nuclear beta decay based on measurements of the angular correlation DJ⋅(pe×pν) in the beta decay of polarized 19Ne. The measurements, spanning a period of 25 years, began with the discovery of CP non‐conservation in neutral kaon decay. During this period, four measurements of the angular correlation were made with increasing accuracy, bringing the upper limit on D to the present value of 0.0004±0.0008, consistent with time reversal invariance. The progress in experimental technique is traced and a new experiment currently under development is described. The planned experiment is expected to reach a sensitivity 5 to 10 times below the present limit. The expected experimental sensitivity is discussed in the context of recent theoretical considerations of CP violation.
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