Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971ap%26ss..14..422c&link_type=abstract
Astrophysics and Space Science, Volume 14, Issue 2, pp.422-430
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
The intensity and energy spectrum of cosmic ray VH-nuclei (20≤Z≤30) has been measured in a stack of nuclear emulsions exposed over Fort Churchill in 1968. The integral intensity above 300 MeV/nucleon was 1.04±0.04 nuclei m-2 sr-1 s-1 and three differential intensities were measured below 750 MeV/nucleon. Because of the current controversy regarding the true intensities of helium nuclei at this phase of the solar cycle we have also measured these nuclei, obtaining results intermediate between those quoted by other workers. Comparison of these results on the VH-and helium nuclei with those obtained in previous observations made at times of low solar modulation leads to the conclusion that there is no significant charge dependence in the modulation process. This conclusion is in conflict with an earlier analysis but depends on results of improved statistical weight and greater reliability for the VH nuclei and on our measurement of the helium nuclei in the same detector.
Cleghorn Timothy Fuller
Freier Phyllis S.
Waddington Jake C.
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