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arXiv · 1008.1738

Measurements of the Electric Form Factor of the Neutron up to Q2=3.4 GeV2 using the Reaction He3(e,e'n)pp

S. Riordan·S. Abrahamyan·B. Craver·A. Kelleher·A. Kolarkar·J. Miller·G. D. Cates·N. Liyanage·B. Wojtsekhowski·A. Acha·K. Allada·B. Anderson·K. A. Aniol·J. R. M. Annand·J. Arrington·T. Averett·A. Beck·M. Bellis·W. Boeglin·H. Breuer·J. R. Calarco·A. Camsonne·J. P. Chen·E. Chudakov·L. Coman·B. Crowe·F. Cusanno·D. Day·P. Degtyarenko·P. A. M. Dolph·C. Dutta·C. Ferdi·C. Fernandez-Ramirez·R. Feuerbach·L. M. Fraile·G. Franklin·S. Frullani·S. Fuchs·F. Garibaldi·N. Gevorgyan·R. Gilman·A. Glamazdin·J. Gomez·K. Grimm·J. O. Hansen·J. L. Herraiz·D. W. Higinbotham·R. Holmes·T. Holmstrom·D. Howell·C. W. deJager·X. Jiang·M. K. Jones·J. Katich·L. J. Kaufman·M. Khandaker·J. J. Kelly·D. Kiselev·W. Korsch·J. LeRose·R. Lindgren·P. Markowitz·D. J. Margaziotis·S. May-Tal Beck·S. Mayilyan·K. McCormick·Z. E. Meziani·R. Michaels·B. Moffit·S. Nanda·V. Nelyubin·T. Ngo·D. M. Nikolenko·B. Norum·L. Pentchev·C. F. Perdrisat·E. Piasetzky·R. Pomatsalyuk·D. Protopopescu·A. J. R. Puckett·V. A. Punjabi·X. Qian·Y. Qiang·B. Quinn·I. Rachek·R. D. Ransome·P. E. Reimer·B. Reitz·J. Roche·G. Ron·O. Rondon·G. Rosner·A. Saha·M. Sargsian·B. Sawatzky·J. Segal·M. Shabestari·A. Shahinyan·Yu. Shestakov·J. Singh
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Abstract

The electric form factor of the neutron was determined from studies of the reaction He3(e,e'n)pp in quasi-elastic kinematics in Hall A at Jefferson Lab. Longitudinally polarized electrons were scattered off a polarized target in which the nuclear polarization was oriented perpendicular to the momentum transfer. The scattered electrons were detected in a magnetic spectrometer in coincidence with neutrons that were registered in a large-solid-angle detector. More than doubling the Q2-range over which it is known, we find GEn = 0.0225 +/- 0.0017 (stat) +/- 0.0024 (syst), 0.0200 +/- 0.0023 +/- 0.0018, and 0.0142 +/- 0.0019 +/- 0.0013 for Q2 = 1.72, 2.48, and 3.41 GeV2, respectively.

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S. Riordan, S. Abrahamyan, B. Craver, A. Kelleher, A. Kolarkar, J. Miller, G. D. Cates, N. Liyanage, B. Wojtsekhowski, A. Acha, K. Allada, B. Anderson, K. A. Aniol, J. R. M. Annand, J. Arrington, T. Averett, A. Beck, M. Bellis, W. Boeglin, H. Breuer, J. R. Calarco, A. Camsonne, J. P. Chen, E. Chudakov, L. Coman, B. Crowe, F. Cusanno, D. Day, P. Degtyarenko, P. A. M. Dolph, C. Dutta, C. Ferdi, C. Fernandez-Ramirez, R. Feuerbach, L. M. Fraile, G. Franklin, S. Frullani, S. Fuchs, F. Garibaldi, N. Gevorgyan, R. Gilman, A. Glamazdin, J. Gomez, K. Grimm, J. O. Hansen, J. L. Herraiz, D. W. Higinbotham, R. Holmes, T. Holmstrom, D. Howell, C. W. deJager, X. Jiang, M. K. Jones, J. Katich, L. J. Kaufman, M. Khandaker, J. J. Kelly, D. Kiselev, W. Korsch, J. LeRose, R. Lindgren, P. Markowitz, D. J. Margaziotis, S. May-Tal Beck, S. Mayilyan, K. McCormick, Z. E. Meziani, R. Michaels, B. Moffit, S. Nanda, V. Nelyubin, T. Ngo, D. M. Nikolenko, B. Norum, L. Pentchev, C. F. Perdrisat, E. Piasetzky, R. Pomatsalyuk, D. Protopopescu, A. J. R. Puckett, V. A. Punjabi, X. Qian, Y. Qiang, B. Quinn, I. Rachek, R. D. Ransome, P. E. Reimer, B. Reitz, J. Roche, G. Ron, O. Rondon, G. Rosner, A. Saha, M. Sargsian, B. Sawatzky, J. Segal, M. Shabestari, A. Shahinyan, Yu. Shestakov, J. Singh. 2010-08-10. Measurements of the Electric Form Factor of the Neutron up to Q2=3.4 GeV2 using the Reaction He3(e,e'n)pp. https://doi.org/10.1103/physrevlett.105.262302

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