# Indiana University

 dc.contributor.advisor Snow, William M en dc.contributor.advisor Klein, Susan B en dc.contributor.author Khosravi, Marjan en dc.date.accessioned 2015-02-10T17:10:08Z en dc.date.available 2015-02-10T17:10:08Z en dc.date.issued 2014-12 en dc.date.submitted 2014 en dc.identifier.uri http://hdl.handle.net/2022/19413 en dc.description Thesis (M.S.) - Indiana University, Physics, 2014 en dc.description.abstract Various studies have been done on exotic spin-dependent short-range forces in the mm to μm range. We are using an ensemble of optically polarized $^3$He gas and an unpolarized test mass to search for such forces. The presence or absence of a Nuclear Magnetic Resonance (NMR) frequency shift when an unpolarized mass is moved away and towards the $^3$He is our experimental signal [1]. It is very important to have no influence from the magnetism of the mass itself on the NMR frequency measurement. This research explicitly deals with preparation and characterization of unpolarized non-magnetic test masses using Gallium/Indium alloys that have very low magnetic susceptibility. We believe the current limit on the NMR frequency shift ceramic (2.6 ± 1.7 10$^{-5}$ Hz), salt water (-0.8 ± 2.6 10$^{-5}$ Hz) due to such spin-dependent forces from a previous experiment using Macor ceramic and 1.02% MnCl$_2$ solution can be improved with the use of these lower magnetic susceptibility test masses. en dc.language.iso en en dc.publisher [Bloomington, Ind.] : Indiana University en dc.subject Fifth Force en dc.subject Gallium-Indium en dc.subject Magnetic Susceptibility en dc.subject Non-Magnetic mass en dc.subject.classification Physics en dc.subject.classification Nuclear physics en dc.title DEVELOPMENT OF GALLIUM-INDIUM ALLOYS AS NONMAGNETIC TEST MASSES FOR SPIN-DEPENDENT SHORT-RANGE FORCE EXPERIMENTS en dc.type Thesis en
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