XXVI. The mean life of charged V-particles

Astbury, J. P.; Buchanan, J. Scott; Chippindale, P.; Millar, D. D.; Newth, J.A.; Page, D.I.; Rytz, A.; Sahiar, A. B.

doi:10.1080/14786440308520303

Cited by 10 publications

(2 citation statements)

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“…But the available data approaching the low-rigidity end of the spectrum are in substantial disagreement. Thus, the Minnesota group 6 reports a steepening of the integral number spectrum of nuclei of Z>10 toward low energies, whereas the Rochester group reports a flattening. 7 Indeed, the definitive investigation of the low-rigidity portion of the spectra of heavy particles is, at present, impractical by balloon methods due to the altitude limitation of balloon flights.…”

Section: Introductionmentioning

confidence: 99%

Low-Momentum End of the Spectra of Heavy Primary Cosmic Rays

1954

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Measurements of the intensity of heavy primary cosmic-ray nuclei have been made above the atmosphere by means of the new Iowa balloon-launched rocket ("rockoon") technique at geomagnetic latitudes \ = 56°, 76°, and 86°. The measuring instrument was a thin-walled, pulse-ionization chamber of 15-cm diameter. The observed data, in conjunction with geomagnetic theory, demonstrate a complete or nearly complete absence of primary heavy nuclei of Z>6 having a magnetic rigidity less than 1.5X10 9 volts (p/mc<0.S) } the result being the most significant for the C, N, O group. It is noted that this spectral cutoff occurs at closely the same magnetic rigidity, and distinctly not at the same velocity, as the previously reported cutoff in the spectra of primary protons and a particles.* Based on doctoral dissertation of R. A. Ellis, Jr., February, 1954 (unpublished).

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Section: Introductionmentioning

confidence: 99%

Low-Momentum End of the Spectra of Heavy Primary Cosmic Rays

1954

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“…Earlier cloud-chamber mean life estimates gave lower and upper bounds of 4 and 10 ntyisec. 7 ' 8 In addition to the K^s, these estimates probably involved other K particles with mean lives short enough not to show up after 12.4 m/*sec.…”

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confidence: 99%