MTV-G experiment : probing a non-standard strong gravitational field at nuclear scale using geodetic precession

Neutron interferometry and tests of short-range modifications of gravity

“…In the microscopic domain, this parameter has been investigated too, by examining possible effects of short-range modifications of gravity through the analysis of the gravitational spin-orbit coupling, which depends on γ [49]. The MTV-G experiment, for example, is based on the spin precession of electrons that are scattered by heavy nuclei [42,43]. The absence of any anomalous signal in the empirical data establishes some bounds on short-distance deviations of the parameter γ [42,44].…”

“…It is interesting to compare (see Figure 1) the MTV-G and spectroscopic bounds with the constraint extracted from neutron interferometry, since, for a restricted class of metric theories, the coefficient α in (20) can be viewed effectively as the Yukawa parameter related to the short-distance modifications of γ, i.e., γ (r) = 1 + αe −r/λ . the MTV-G and spectroscopy limits (extracted from [42][43][44]). The region above the lines are excluded.…”

“…For a restricted class of metric theories, the interferometric constraints obtained here can be compared to the bounds extracted from the MTV-G experiment [42][43][44] and from the spectroscopy [44] concerning short-distance modifications of the post-Newtonian γparameter (related to the curvature of spatial sections of the spacetime). As we shall see, neutron interferometry establishes the most stringent bounds for this parameter in the length scale between 1.4 × 10 −7 m and 10 −4 m.…”

T-Violation experiment at TRIUMF-ISAC using polarized8Li

“…The first physics data-taking using the CDC is scheduled to occur in autumn 2013. This experimental setup is also used for a different experiment, MTV-G aiming gravity physics using an un-polarized Sr(Y)-90 source, partially as a final check and calibration for the MTV experiment [6]. The highest statistical precision data with reduced systematic effects are expected to be obtained for finding the T-violating Rcorrelation.…”

Development of a novel scintillation-trigger detector for the MTV experiment using aluminum-metallized film tapes

“…The electrons emitted from the Li-8 nuclei fly out from the FRP stopper tube, and their polarization is measured using the MTV detector array. In addition to the Li-8 measurement, we also used this detector setup to perform a calibration measurement using an artificially produced transversely polarized electron source, and also, a gravity experiment named MTV-G [7], which probes large spin precession around the nuclei. In the MTV-G and calibration measurements, the electron's polarization is measured in a double scattering experiment, using an un- polarized Sr (Y)-90 radiation source.…”