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Helioseismological sound-speed profiles severely constrain possible deviations from standard solar models, allowing us to derive new limits on anomalous solar energy losses by the Primakoff emission of axions. For an axion-photon coupling gay 5 × 10−10 GeV−1, the solar model is almost indistinguishable from the standard case, while gay 10 × 10−10 GeV−1 is probably excluded, corresponding to an axion luminosity of about 0.20 L. This constraint on gay is much weaker than the well-known globular-cluster limit, but about a factor of 3 more restrictive than previous solar limits. Our result is primarily of interest to the large number of current or proposed search experiments for solar axions because our limit defines the maximum gay for which it is self-consistent to use a standard solar model to calculate the axion luminosity. 相似文献
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Dieter Kley 《Journal of Atmospheric Chemistry》1984,2(2):203-210
The absorption cross-sections of water vapor and oxygen were measured, using a low-pressure radio frequency discharge through traces of hydrogen in argon as a light source for Ly() radiation. The cross-sections are H2O = 1.59 × 10–17 cm2 and O2 = 1.13 × 10–20 + 1.72 × 10–23 for water and oxygen, respectively, where P is the oxygen pressure in units of Torr. Ly() lamps, such as used for this work, are important light sources for photochemical laboratory work and find applications for trace-gas detection in the atmosphere. For the latter application, accurate cross-sections of water vapor and oxygen are needed. 相似文献
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