학술논문
Measurement of polarization-transfer to bound protons in carbon and its virtuality dependence
Document Type
article
Author
D. Izraeli; T. Brecelj; P. Achenbach; A. Ashkenazi; R. Böhm; E.O. Cohen; M.O. Distler; A. Esser; R. Gilman; T. Kolar; I. Korover; J. Lichtenstadt; I. Mardor; H. Merkel; M. Mihovilovič; U. Müller; M. Olivenboim; E. Piasetzky; G. Ron; B.S. Schlimme; M. Schoth; C. Sfienti; S. Širca; S. Štajner; S. Strauch; M. Thiel; A. Weber; I. Yaron
Source
Physics Letters B, Vol 781, Iss , Pp 95-98 (2018)
Subject
Language
English
ISSN
0370-2693
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→,e′p→) 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.