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      Measurement of polarization-transfer to bound protons in carbon and its virtuality dependence

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          Abstract

          We measured the ratio \(P_{x}/P_{z}\) of the transverse to longitudinal components of polarization transferred from electrons to bound protons in \(^{12}\mathrm{C}\) by the \(^{12}\mathrm{C}(\vec{e},e'\vec{p})\) process at the Mainz Microtron (MAMI). We observed consistent deviations from unity of this ratio normalized to the free-proton ratio, \((P_{x}/P_{z})_{^{12}\mathrm{C}}/(P_{x}/P_{z})_{^{1}\mathrm{H}}\), for both \(s\)- and \(p\)-shell knocked out protons, even though they are embedded in time averaged local densities that differ by about a factor of two. The dependence of the double ratio on proton virtuality is similar to the one for knocked out protons from \(^{2}\mathrm{H}\) and \(^{4}\mathrm{He}\), suggesting a universal behavior. It further implies no dependence on average local nuclear density.

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          The three-spectrometer facility at the Mainz microtron MAMI

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            Polarization transfer in the \(^{4}\)He\((\vec{e},e' \vec{p}^{3}\)H reaction

            , , (2010)
            Polarization transfer in the 4He(e,e'p)3H reaction at a Q^2 of 0.4 (GeV/c)^2 was measured at the Mainz Microtron MAMI. The ratio of the transverse to the longitudinal polarization components of the ejected protons was compared with the same ratio for elastic ep scattering. The results are consistent with a recent fully relativistic calculation which includes a predicted medium modification of the proton form factor based on a quark-meson coupling model.
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              Polarization transfer in the\({}^{16}\mathrm{O}(\overrightarrow{e}{,e}^{\prime }\overrightarrow{p}{)}^{15}\mathrm{N}\)reaction

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                Author and article information

                Journal
                27 November 2017
                Article
                1711.09680
                42f88354-2c5a-49f5-aac9-8c6499388ee5

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                (*) These authors contributed equally to this work
                nucl-ex

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