Search for new gravity-like interactions at nanometer range using cold neutron beams
We propose to search for new gravity-like short-range forces by measuring the angular distribution of 5 A neutrons scattering off atomic Xenon gas. Some beyond-the-standard-model theories of particle physics, based on supersymmetry or extra space dimensions, involve gravity or gravity-like interactions, and modify Newton's inverse-square law of gravity at short range. They predict new mediating particles which are sufficiently light to be detected by our experimental scheme. The new interactions may also provide a mechanism which violates the weak equivalence principle, as implied by quantum gravity, therefore such a short-range test is crucial to understand the nature of gravity. An experimental search was recently performed in 2014 and new stringent constraints were obtained using this scheme. The results was published by Y. Kamiya et al., in PRL 114, 161101 (2015). The experimental sensitivity is still limited by statistics, so we propose beam time at ILL's beam lines at which the world's most intense neutron beams are supplied.
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KAMIYA Yoshio; CUBITT Robert; YAMADA Koji and ZIMMER Oliver. (2017). Search for new gravity-like interactions at nanometer range using cold neutron beams. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.3-15-89
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