Elsevier

Nuclear Physics A

Volume 195, Issue 2, 13 November 1972, Pages 534-544
Nuclear Physics A

Proximity 3He(n, p)3H reaction following the sequential 6Li(d,3He)5He(n)4He reaction and the lifetime of 5He

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Abstract

Evidence for the proximity 3He(n, p)3H reaction in the final state of the sequential 6Li(d,3He)5He(n)4He process was observed. The behaviour of the positions of the peaks in the two-dimensional spectra was consistent with kinematical predictions. It should be emphasized that the proximity scattering was extended to a rearrangement process. The strength of the process gave direct information on the lifetime of the ground state of 5He. A classical estimate led to τ = 1.4 × 10−21 sec, which is the shortest nuclear lifetime directly measured. The consistency of this value with the level width gives quantitative support for the occurrence of the proximity reaction.

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Present address: Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo, Japan.

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