2017/11/30 by A1 Collaboration, Tilen Brecelj, D. Izraeli +28 · 17 citations
Chemistry · Physics and Astronomy · #Advanced Chemical Physics Studies #Advanced NMR Techniques and Applications #Atomic and Molecular Physics #Atomic physics #Chemistry #Electron #Microtron #Nuclear physics #Physics #Polarization (electrochemistry) #Proton #nucl-ex
paper · pdf · open access · doi:10.1016/j.physletb.2018.03.027
published in Physics Letters B 781, 95-98 (Elsevier BV)
openalex created_date 2017/12/04 · arxiv created 2018/02/16 · openalex publication_date 2018/03/21 · arxiv updated 2018/03/28 · openalex updated_date 2026/08/06
We measured the ratio P x / P z of the transverse to longitudinal components of polarization transferred from electrons to bound protons in C 12 by the C 12 ( e → , e ′ 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 ) C 12 / ( P x / P z ) H 1 , 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 H 2 and He 4 , suggesting a universal behavior. It further implies no dependence on average local nuclear density.