New Limit on Lorentz-Invariance- and C P T -Violating Neutron Spin Interactions Using a Free-Spin-Precession He 3 - Xe 129 Comagnetometer

New Limit on Lorentz-Invariance- and C P T -Violating Neutron Spin Interactions Using a Free-Spin-Precession He 3 - Xe 129 Comagnetometer