Search for Anomalous SpinLike Gravitational Interactions Using a Torsion Pendulum.
Abstract
A torsion pendulum is used in the timeofswing method to search for weak anomalous spindependent forces between test masses containing polarized electrons. The large attracting masses have 2 times 10^{23} aligned electrons and the small beam masses have onetenth as many. In order to avoid the problems associated with superconducting shields, the masses were fabricated from a DyFe compound. This compound has internal orbital compensation of the magnetic moment of the aligned spins. With this internal compensation of the magnetic moments, a minimum amount of shielding is needed to account for the imperfectly compensated moment at room temperature. The unique features of this experiment include the spinpolarized masses fabricated from the DyFe compound, the novel use of a modified Fast Fourier Transform algorithm, and the use of the highly sensitive relative precision mode of the torsion pendulum. In terms of the limit on the anomalous spincoupling constant, alpha _{rm s}, consider that there exists a spindependent potential of the form V _{rm a} = alpha _{rm s}S(vec sigma_1, vecsigma _2), where alpha_{ rm s} is the constant which determines the strength of the interaction and S is a tensor interaction of the dipoledipole form. Given a potential of this form, alpha_{rm s} can be written asalpha_ {s} = {anomalous^in torque over magnetic^in torque}. This experiment places a value on alpha _{rm s} of alpha _{rm s} = (0.7 +/ 7.1) times 10^{12}.
 Publication:

Ph.D. Thesis
 Pub Date:
 1989
 Bibcode:
 1989PhDT.......100G
 Keywords:

 Physics: General; Physics: Elementary Particles and High Energy