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Results from a search for cosmic axions

C. Hagmann, P. Sikivie, N. S. Sullivan, and D. B. Tanner
Phys. Rev. D 42, 1297(R) – Published 15 August 1990
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Abstract

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=(5.45.9)×106 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.

  • Received 26 March 1990

DOI:https://doi.org/10.1103/PhysRevD.42.1297

©1990 American Physical Society

Authors & Affiliations

C. Hagmann, P. Sikivie, N. S. Sullivan, and D. B. Tanner

  • University of Florida, Gainesville, Florida 32611

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Vol. 42, Iss. 4 — 15 August 1990

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