LXVI. Capture of negative mesons

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Abstract
The time taken for a negative meson, stopping in a solid, to reach its lowest Bohr orbit about a nucleus, is discussed, with special reference to the possibility of “trapping” for a long time in a bound orbit in insulators. It is shown that there are more ways in which this can happen than are dealt with in Fermi and Teller's discussion ; and an approximate calculation is made of the time spent in a trap. The results are consistent with the experimental observations on π and μ mesons. For heavy mesons (mass∼900 me ), the time of approach to a nucleus is found to be normally 10-13-10-12 sec., but trapping of mesons may be expected in certain circumstances for times up to 10-5 sec.

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