Limits on Anomalous Spin-Spin Couplings between Neutrons

Details Limits on Anomalous Spin-Spin Couplings between Neutrons Limits on Anomalous Spin-Spin Couplings between Neutrons

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvl.101z1801g&link_type=abstract

Physical Review Letters, vol. 101, Issue 26, id. 261801

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7

Electromagnetic Form Factors, Lorentz And Poincare Invariance, Axions And Other Nambu-Goldstone Bosons, Zeeman And Stark Effects

Scientific paper

We report experimental limits on new spin-dependent macroscopic forces between neutrons. We measured the nuclear Zeeman frequencies of a He3/Xe129 maser while modulating the nuclear spin polarization of a nearby He3 ensemble in a separate glass cell. We place limits on the coupling strength of neutron spin-spin interactions mediated by light pseudoscalar particles like the axion [gpgp/(4πℏc)] at the 3×10-7 level for interaction ranges longer than about 40 cm. This limit is about 10-5 the size of the magnetic dipole-dipole interaction between neutrons.

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