Elsevier

Nuclear Physics A

Volume 166, Issue 3, 10 May 1971, Pages 661-666
Nuclear Physics A

Properties of 13B and 20Na: The second-class current problem

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Abstract

The half-lives of 13B and 20Na are measured: t12(13B) = 17.33 ± 0.17 ms; t12(20Na) = 442 ± 5 ms. The mass difference is measured: 20Na−20Ne = 13.892 ± 0.007 MeV. Combined with other data these measurements lead to (ft)+/(ft) = 1.166 ± 0.026 for A = 13 and 1.054 ± 0.023 for A = 20. If these numbers were to be directly interpreted in terms of secondclass currents we should find for the induced tensor coupling constant: gIT(13) = (2.6 ± 0.5) × 10−3; gIT(20) = (1.5 ± 0.6) × 10−3.

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††

Work performed under the auspices of the US Atomic Energy Commission.

Battelle Distinguished Professor 1970–1971, University of Washington. Permanent address: Nuclear Physics Laboratory, Oxford, England.

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