Test of spatial isotropy using a cryogenic torsion pendulum

Details Test of spatial isotropy using a cryogenic torsion pendulum Test of spatial isotropy using a cryogenic torsion pendulum

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phrvl..59.1784p&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 59, Oct. 12, 1987, p. 1784-1787. Research supported by the Research Corp., McDonn

Physics

14

Cryogenics, Earth Motion, Electron Energy, Electron Spin, Pendulums, Spatial Distribution, Liquid Helium, Magnetic Fields, Magnetic Moments, Nuclear Spin, Vacuum Chambers, Special Relativity

Scientific paper

Motion of the earth through the cosmic neutrino background, or through certain kinds of vacuum states, produces a term of the form g(sigma) x v in the energy of an electron. To search for such a term, a cryogenic torsion pendulum carrying a transversely polarized magnet was used. Superconducting shields reduced magnetic torques. A sigma x v term would produce a sinusoidal oscillation of the pendulum with a period of one sidereal day. Such an oscillation was not detected, and a new limit of 8.5 x 10 to the -18th eV has been set for the splitting of the spin states of an electron at rest on the earth.

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