S Alsalmi, I Albayrak, A Ahmidouch, J Arrington, A Asaturyan, A Bodek, P Bosted, R Bradford, E Brash, A Bruell, C Butuceanu, M E Christy, S J Coleman, M Commisso, S H Connell, M M Dalton, S Danagoulian, A Daniel, D B Day, S Dhamija, J Dunne, D Dutta, R Ent, D Gaskell, A Gasparian, R Gran, T Horn, Liting Huang, G M Huber, C Jayalath, M Johnson, M K Jones, N Kalantarians, A Liyanage, C E Keppel, E Kinney, Y Li, S Malace, V Mamyan, S Manly, P Markowitz, J Maxwell, N N Mbianda, K S McFarland, M Meziane, Z E Meziani, G B Mills, H Mkrtchyan, A Mkrtchyan, J Mulholland, J K Nelson, G Niculescu, I Niculescu, L Pentchev, A Puckett, V Punjabi, I A Qattan, P E Reimer, J Reinhold, V M Rodriguez, O Rondon-Aramayo, M Sakuda, W K Sakumoto, E Segbefia, T Seva, I Sick, K Slifer, G R Smith, J Steinman, P Solvignon, V Tadevosyan, S Tajima, V Tvaskis, W F Vulcan, T Walton, F R Wesselmann, S A Wood, Zhihong Ye, JUPITER Collaboration: JLab E02-109 E04-001 E06-009
We present results from a high precision experimental study of the nuclear modification of the longitudinal (F_{L}) to transverse (F_{1}) structure function ratio for bound nucleons in the resonance region. The inclusive electron scattering cross sections were measured in Jefferson Lab Experimental Hall C on carbon and deuterium nuclei for a large range of kinematics, allowing for separations of the longitudinal and transverse structure functions to be performed at a range of four-momentum transfer values 0.5≤Q^{2}≤3.75 GeV^{2}. In contrast to the significant body of measurements of the nuclear modification of the F_{2} structure function in the deep inelastic scattering region, there is very little on F_{L} and R=F_{L}/2xF_{1} in the region of the nucleon resonances. In this Letter we present measurements of the nuclear effect on R for ^{12}C (R_{C}) relative to deuterium (R_{D}). These results indicate regions in which in R_{C}>R_{D}, requiring that the nuclear modifications be different in all three structure functions, F_{2}, F_{1}, and F_{L}.