Limits on the abundance and coupling of cosmic axions at m(a) of between 4.5 and 5.0 microeV

Details Limits on the abundance and coupling of cosmic axions at m(a) of between 4.5 and 5.0 microeV Limits on the abundance and coupling of cosmic axions at m(a) of between 4.5 and 5.0 microeV

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phrvl..59..839d&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 59, Aug. 17, 1987, p. 839-842. DOE-supported research.

Physics

60

Abundance, Cosmic Rays, Elementary Particles, Galactic Radiation, Photons, Cavity Resonators, Fermions, Field Effect Transistors, Gallium Arsenides, Microwave Oscillators, Power Spectra

Scientific paper

Results from a search for galactic axions in the 4.5-5.0 microeV mass range, corresponding to the 1.09-1.22 GHz vacuum expectation energy range, are reported. A 6-T superconducting solenoid with a 20-cm bore is used in the experimental set-up. A limit of 10 to the -21st W on the power from a narrow axion-conversion line corresponding to 5sigma is given, and a theoretical expected power, P(a), that is a factor of 300 lower than the experimental limit is found. From a search for the presence of a continuous spectrum of light pseudoscalar particles, a limit on the coupling constant of about 10 to the -11th Ge/V is found under the assumption that the spectrum is bounded between the upper and lower frequencies, delta f = 130 MHz.

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