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High-speed radioactive nuclei 12 B(T 1/2 =20.3ms), 8 Li(T 1/2 =838ms), and 17 N(T 1/2 =4.17s) were introduced into liquid helium at temperatures 4.20-1.15 K. The impurities were individually detected with a multi-counter detection system, which resolved the position and time of the beta-ray emission. Two regimes...
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