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

A1 Collaboration

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Abstract

We measured the ratio Px/Pz of the transverse to longitudinal components of polarization transferred from electrons to bound protons in C12 by the C12(e→,ep→) process at the Mainz Microtron (MAMI). We observed consistent deviations from unity of this ratio normalized to the free-proton ratio, (Px/Pz)C12/(Px/Pz)H1, for both s- and p-shell knocked out protons, even though they are embedded in 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 H2 and He4, suggesting a universal behavior. It further implies no dependence on average local nuclear density.

Original languageAmerican English
Pages (from-to)95-98
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume781
DOIs
StatePublished - 10 Jun 2018

Bibliographical note

Funding Information:
We would like to thank the Mainz Microtron operators and technical crew for the excellent operation of the accelerator. This work is supported by the Israel Science Foundation (Grant 390/15 ) of the Israel Academy of Arts and Sciences, by the Israel Ministry of Science, Technology and Space , by the Deutsche Forschungsgemeinschaft ( Collaborative Research Center 1044 ), by the U.S. National Science Foundation ( PHY-1205782 ), and by the Croatian Science Foundation Project No. 1680 . We acknowledge the financial support from the Slovenian Research Agency (research core funding No. P1–0102 ).

Funding Information:
We would like to thank the Mainz Microtron operators and technical crew for the excellent operation of the accelerator. This work is supported by the Israel Science Foundation (Grant 390/15) of the Israel Academy of Arts and Sciences, by the Israel Ministry of Science, Technology and Space, by the Deutsche Forschungsgemeinschaft (Collaborative Research Center 1044), by the U.S. National Science Foundation (PHY-1205782), and by the Croatian Science Foundation Project No. 1680. We acknowledge the financial support from the Slovenian Research Agency (research core funding No. P1–0102).

Publisher Copyright:
© 2018 The Author(s)

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