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On Wed, 06 Jun 2012 10:30:53 GMT, John Apostolakis wrote:
> You have found a feature of handling of decay at rest: it is handled > by the AtRest process of capture - not the usual decay process. > I think that there are technical reasons for this.
I believe this is not merely "technical", but from a physics standpoint it is correct. Any mu- that stops in a material is captured by some nucleus in a time that is short compared to the free muon lifetime. The lifetime of a captured muon is shorter than that of a free muon (~864 ns when bound to Al, and shorter still for higher Z), so this has an important effect on the decay lifetime.
Of course this does not apply to mu+. For it, electron capture to muonium is possible, bur rather rare.
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