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2003

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November

  

Reviews of topical problems


Helium-isotope mass-spectrometric method for studying tritium beta decay (idea, experiment, nuclear and molecular physics applications)

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Ioffe Institute, ul. Polytekhnicheskaya 26, St. Petersburg, 194021, Russian Federation

Experimental data on the variation of tritium nucleus beta decay constant caused by the interaction of the resulting beta-electron with orbital electrons and shell vacancies are reviewed for free atomic tritium and molecular tritium and used to obtain the half-life of atomic tritium (T1/2)a=(12.264±0.018) y, the half-life of the free triton (T1/2)t=(12.238±0.020) y, the axial-vector-to-vector weak-interaction coupling constant ratio (GA/GV)t=-1.2646 ± 0.0035 for beta decay of the triton, and an independent estimate of the free neutron lifetime τn= (890.3 ± 3.9stat ± 1.4syst) s.

Text can be downloaded in Russian. English translation is available on IOP Science.
PACS: 14.20.Dh, 23.40.−s, 25.55.−e (all)
DOI: 10.1070/PU2003v046n11ABEH001382
URL: https://ufn.ru/en/articles/2003/11/c/
Citation: Akulov Yu A, Mamyrin B A "Helium-isotope mass-spectrometric method for studying tritium beta decay (idea, experiment, nuclear and molecular physics applications)" Phys. Usp. 46 1153–1162 (2003)
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Оригинал: Акулов Ю А, Мамырин Б А «Изотопно-гелиевый масс-спектрометрический метод исследования бета-распада трития (идея, эксперимент, применение в ядерной и молекулярной физике)» УФН 173 1187–1197 (2003); DOI: 10.3367/UFNr.0173.200311c.1187

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