We present the first measurements of the double ratio of the polarization-transfer components (Px/Pz)p/(Px/Pz)s for knock-out protons from the s and p shells in C12 measured by the C12(e→,ep→) reaction in quasi-elastic kinematics. The data are compared to theoretical predictions in the relativistic distorted-wave impulse approximation. Our results show that the differences between s- and p-shell protons, observed when compared at the same initial momentum (missing momentum), largely disappear when the comparison is done at the same proton virtuality. We observe no difference in medium modifications between protons from the s and p shells with the same virtuality in spite of the large differences in the respective nuclear densities.

Original languageEnglish
Article number135903
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - 10 Dec 2020


FundersFunder number
Israel Academy of Arts and Sciences
U.S. National Science Foundation
National Science Foundation2017630, PHY-1205782
National Science Foundation
Directorate for Mathematical and Physical Sciences1205782
Directorate for Mathematical and Physical Sciences
Bonfils-Stanton Foundation
Bloom's Syndrome Foundation
Deutsche Forschungsgemeinschaft
Ministry of Science, Technology and Space
United States-Israel Binational Science Foundation
Israel Science Foundation951/19, 390/15
Israel Science Foundation
Javna Agencija za Raziskovalno Dejavnost RSP1-0102
Javna Agencija za Raziskovalno Dejavnost RS
Hrvatska Zaklada za Znanost8570
Hrvatska Zaklada za Znanost
PAZY Foundation294/18
PAZY Foundation


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