A determination of γ-mesotron rest lifetime and a verification of the relativistic expression for variation of lifetime with momentum
✍ Scribed by D.W. Seymour; W.F.G. Swann
- Publisher
- Elsevier Science
- Year
- 1954
- Tongue
- English
- Weight
- 698 KB
- Volume
- 258
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
Measurements of cosmic ray intensity have been made simultaneously with counter telescopes at altitudes differing by about 3000 ft. and in locations which were the same within a distance of about 8 miles. Data were obtained for various thicknesses of lead absorber and with an additional thickness of absorbing material in the upper telescopes to compensate for absorption in the air column between the two sets of telescopes.
From the foregoing data the rest mean life values have been calculated on the basis of the relativistic variation of mean life with momentum for various ranges of momenta of the rays concerned. The theory 2 of the calculation allows for the continual change of mean life resulting from loss of momentum of the mesotrons as they pass through the air.
The value of the rest mean life obtained is 2.3 X 10 -6 sec. and is constant over the ranges of momenta concerned, within the limits of accuracy of the data, thus confirming to this extent the relativistic expression.
The results are in close agreement with those of Rossi et al, but differ from the results obtained by Nielsen.