期刊
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
卷 31, 期 2, 页码 129-139出版社
IOP PUBLISHING LTD
DOI: 10.1088/0954-3899/31/2/005
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The observed alpha decay half-life values of favoured alpha transitions of l = 5 in bismuth isotopes have been analysed in the framework of a model based on quantum mechanical tunnelling through a potential barrier where the centrifugal and overlapping effects are taken into account. In particular, the very recently measured alpha decay half-life value of (1.9 +/- 0.2) x 10(19) y for the unique naturally occurring Bi-209 isotope has been reproduced by the present approach as (1.0 +/- 0.3) x 10(19) y. Also, the partial alpha decay half-lives for a number of unmeasured alpha transitions of l = 5 in bismuth isotopes are predicted by the model, thus making it possible to demonstrate the influence of the 126 neutron shell closure on the alpha decay half-life. The present approach is shown to be successfully applicable to other isotopic sequences of alpha-emitter nuclides.
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