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Phys. Rev. 59, 223–228 (1941)

[Issue 3 – 1 February 1941 ]

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Variation of the Rate of Decay of Mesotrons with Momentum

Bruno Rossi* and David B. Hall
University of Chicago, Chicago, Illinois
Received 13 December 1940

In order to determine the dependence of the probability of decay on momentum, mesotrons with range between 196 and 311 g/cm2 of lead and mesotrons with range larger than 311 g/cm2 of lead were investigated separately. The softer group of mesotrons was found to disintegrate at a rate about three times faster than the more penetrating group, in agreement with the theoretical predictions based on the relativity change in rate of a moving clock. A new value of the proper lifetime of mesotrons of (2.4±0.3) x 10-6 sec. is determined, based upon measurements with particles with momentum of approximately 5 x 108 ev/c.

©1941 The American Physical Society

URL: http://link.aps.org/abstract/PR/v59/p223
DOI: 10.1103/PhysRev.59.223


* Now at Cornell University, Ithaca, New York.

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References

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  1. B. Rossi, N. Hilberry and J. B. Hoag, (a) Phys. Rev. 56, 837 (1939) ; (b) 57, 461 (1940) .
  2. W. M. Nielsen, C. M. Ryerson, L. W. Nordheim and K. Z. Morgan, Phys. Rev. 57, 158 (1940) .
  3. M. Ageno, G. Bernardini, N. B. Cacciapuoti, B. Ferretti and G. C. Wick, Phys. Rev. 57, 945 (1940) .
  4. H. V. Neher and H. G. Stever, Phys. Rev. 58, 766 (1940) .
  5. A. Ehmert, Zeits. f. Physik 115, 333 (1940) [CAS].
  6. B. Rossi, Phys. Rev. 57, 660 (1940) .
  7. E. Fermi, Phys. Rev. 57, 485 (1940) .
  8. p. 464, reference 1(b).
  9. O. Halpern and H. Hall, Phys. Rev. 57, 459 (1940) .
  10. Halpern and Hall (reference (7)).
  11. "The disintegration of mesotrons" by B. Rossi, Rev. Mod. Phys. 11, 296 (1939).
  12. P. M. S. Blackett, Proc. Roy. Soc. A159, 1 (1937) [CAS]; D. J. Hughes, Phys. Rev. 57, 592 (1940) .
  13. reference 2; M. A. Pomerantz, Phys. Rev. 57, 3 (1940) .


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