Results from a search for cosmic axions

Details Results from a search for cosmic axions Results from a search for cosmic axions

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvd..42.1297h&link_type=abstract

Physical Review D (Particles and Fields), Volume 42, Issue 4, 15 August 1990, pp.1297-1300

Physics

83

Scientific paper

A search experiment has been carried out to look for relic cosmic axions trapped in the halo of our Galaxy and limits on their coupling gaγγ and galactic abundance are presented for the axion mass range of ma=(5.4-5.9)×10-6 eV. The detector consisted of a tunable high-Q microwave cavity immersed in liquid helium and permeated by a strong magnetic field. A low-noise microwave receiver with a cryogenic HEMT amplifier as its first stage was coupled to the cavity. The noise power within successive cavity bandwidths was spectrum analyzed and searched for narrow peaks resulting from axion-to-photon conversions in the cavity.

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