Limits on the Electromagnetic Coupling and Density of Galactic Axions.

Details Limits on the Electromagnetic Coupling and Density of Galactic Axions. Limits on the Electromagnetic Coupling and Density of Galactic Axions.

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt........98r&link_type=abstract

Thesis (PH.D.)--THE UNIVERSITY OF ROCHESTER, 1987.Source: Dissertation Abstracts International, Volume: 49-01, Section: B, page:

Computer Science

Scientific paper

We present results from a search for axions in the galactic halo. A microwave cavity placed in a strong magnetic field was used to attempt to detect these axions through their electromagnetic coupling. The experimental signature of the cold axions that may comprise the galactic dark matter is their conversion to microwave photons in the cavity when its resonant frequency coincides with the axion energy. The fractional width of the microwave line is determined by the average kinetic energy of the axions and is expected to be 3 times 10 ^{-7}. A sensitive microwave receiver is used to detect the converted power. The cavity and receiver were tuned through two frequency ranges, 1.09059 to 1.21833 GHz and 2.73179 to 2.80097 GHz. None of the lines observed in the spectrum demonstrated the magnetic field dependence of received power required in axion conversion. We obtained an upper limit on the product of the axion's electromagnetic coupling and local density. For 4.51035 mueV <=q m_{rm a} <=q 5.03865 mueV, g^2_{rm agammagamma} /m^2_{rm a} < 2.6 times 10^{-41}. For 11.2978 mueV <=q m _{rm a} <=q 11.5840 mueV, g ^2_{rm agammagamma }/m ^2_{rm a} < 3.6 times 10^ {-40}. The theoretical prediction, using = 300 MeV/cm^3, is g^2 _{rm agammagamma}< rho>/m^2_ {rm a} = 3.9 times 10^{-44}. We also obtained a limit g_{ rm agammagamma} < 6 times 10^ {-26} MeV^{1/2} cdot cm^{3/2} for m_{rm a} <=q 5.851 mueV from the absence of damping of microwave energy in the cavity due to conversion to axions. These are the first limits established by a laboratory experiment on the axion coupling in this low energy range.

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