1. Dispersive corrections in elastic electron-nucleus scattering: an investigation in the intermediate energy regime and their impact on the nuclear matter
- Author
-
L. Coman, Karl Slifer, E. Schulte, Guy Ron, P. Solvignon, S. May-Tal Beck, J. Song, R. Subedi, E. Piasetzky, R. Michaels, C. F. Perdrisat, B. Craver, Young Do Oh, M. Olson, P. Gueye, C. E. Hyde, G. G. Petratos, V. A. Punjabi, E. McCullough, G. M. Urciuoli, Asghar Askarpour Kabir, Pete Markowitz, A. Kelleher, Ronald Ransome, Ishay Pomerantz, J. J. LeRose, M. Potokar, A. J. Sarty, A. J. R. Puckett, R. Pomatsalyuk, J. Dumas, Xin Qian, C. Dutta, H. F. Ibrahim, A. P. Freyberger, R. Lindgren, M. Meziane, Kent Paschke, A. Shahinyan, B. Sawatzky, E. Kuchina, R. Sparks, Xiaofeng Zhu, S. Strauch, D. G. Meekins, B. L. Berman, F. Cusanno, Z. E. Meziani, A. T. Katramatou, J. Glister, T. Holmstrom, X. Yan, R. J. Feuerbach, J. Arrington, E. Chudakov, Y. Qiang, Fatiha Benmokhtar, B. E. Norum, H. Arenaövel, M. Paolone, J. O. Hansen, J. Roche, W. U. Boeglin, Bryan J. Moffit, A. Camsonne, Franco Garibaldi, H. Yao, M. Schwamb, Byounghoon Lee, Simon Širca, X. Zhan, S. Choi, X. Jiang, R. Shneor, Whitney Armstrong, Kalyan Allada, E. J. Brash, G. J. Kumbartzki, P. Giuliani, Y. Ilieva, M. H. Shabestari, A. Beck, M. Reyhan, Salvatore Frullani, Ronald Gilman, J. P. Chen, Douglas Higinbotham, M. K. Jones, J. R. Calarco, Yannick Rousseau, K. Wang, A. Adeyemi, Bogdan Wojtsekhowski, E. Khrosinkova, Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Jefferson Lab Hall A, and Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
- Subjects
Diffraction ,Elastic scattering ,Physics ,Nuclear and High Energy Physics ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,010308 nuclear & particles physics ,Scattering ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear matter ,01 natural sciences ,7. Clean energy ,Effective nuclear charge ,Cross section (physics) ,0103 physical sciences ,Nuclear fusion ,Atomic physics ,Born approximation ,010306 general physics - Abstract
Measurements of elastic electron scattering data within the past decade have highlighted two-photon exchange contributions as a necessary ingredient in theoretical calculations to precisely evaluate hydrogen elastic scattering cross sections. This correction can modify the cross section at the few percent level. In contrast, dispersive effects can cause significantly larger changes from the Born approximation. The purpose of this experiment is to extract the carbon-12 elastic cross section around the first diffraction minimum, where the Born term contributions to the cross section are small to maximize the sensitivity to dispersive effects. The analysis uses the LEDEX data from the high resolution Jefferson Lab Hall A spectrometers to extract the cross sections near the first diffraction minimum of $$^{12}$$ C at beam energies of 362 MeV and 685 MeV. The results are in very good agreement with previous world data, although with less precision. The average deviation from a static nuclear charge distribution expected from linear and quadratic fits indicate a 30.6% contribution of dispersive effects to the cross section at 1 GeV. The magnitude of the dispersive effects near the first diffraction minimum of $$^{12}$$ C has been confirmed to be large with a strong energy dependence and could account for a large fraction of the magnitude for the observed quenching of the longitudinal nuclear response. These effects could also be important for nuclei radii extracted from parity-violating asymmetries measured near a diffraction minimum.
- Published
- 2020
- Full Text
- View/download PDF