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Article ; Online: Measurement of the Charge-Averaged Elastic Lepton-Proton Scattering Cross Section by the OLYMPUS Experiment.

Bernauer, J C / Schmidt, A / Henderson, B S / Ice, L D / Khaneft, D / O'Connor, C / Russell, R / Akopov, N / Alarcon, R / Ates, O / Avetisyan, A / Beck, R / Belostotski, S / Bessuille, J / Brinker, F / Calarco, J R / Carassiti, V / Cisbani, E / Ciullo, G /

Contalbrigo, M / De Leo, R / Diefenbach, J / Donnelly, T W / Dow, K / Elbakian, G / Eversheim, P D / Frullani, S / Funke, Ch / Gavrilov, G / Gläser, B / Görrissen, N / Hasell, D K / Hauschildt, J / Hoffmeister, Ph / Holler, Y / Ihloff, E / Izotov, A / Kaiser, R / Karyan, G / Kelsey, J / Kiselev, A / Klassen, P / Krivshich, A / Kohl, M / Lehmann, I / Lenisa, P / Lenz, D / Lumsden, S / Ma, Y / Maas, F / Marukyan, H / Miklukho, O / Milner, R G / Movsisyan, A / Murray, M / Naryshkin, Y / Perez Benito, R / Perrino, R / Redwine, R P / Rodríguez Piñeiro, D / Rosner, G / Schneekloth, U / Seitz, B / Statera, M / Thiel, A / Vardanyan, H / Veretennikov, D / Vidal, C / Winnebeck, A / Yeganov, V

Physical review letters

2021 Volume 126, Issue 16, Page(s) 162501

Abstract: We report the first measurement of the average of the electron-proton and positron-proton elastic scattering cross sections. This lepton charge-averaged cross section is insensitive to the leading effects of hard two-photon exchange, giving more robust ... ...

Abstract	We report the first measurement of the average of the electron-proton and positron-proton elastic scattering cross sections. This lepton charge-averaged cross section is insensitive to the leading effects of hard two-photon exchange, giving more robust access to the proton's electromagnetic form factors. The cross section was extracted from data taken by the OLYMPUS experiment at DESY, in which alternating stored electron and positron beams were scattered from a windowless gaseous hydrogen target. Elastic scattering events were identified from the coincident detection of the scattered lepton and recoil proton in a large-acceptance toroidal spectrometer. The luminosity was determined from the rates of Møller, Bhabha, and elastic scattering in forward electromagnetic calorimeters. The data provide some selectivity between existing form factor global fits and will provide valuable constraints to future fits.
Language	English
Publishing date	2021-05-07
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.126.162501
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Article ; Online: First Observation of P-odd γ Asymmetry in Polarized Neutron Capture on Hydrogen.

Blyth, D / Fry, J / Fomin, N / Alarcon, R / Alonzi, L / Askanazi, E / Baeßler, S / Balascuta, S / Barrón-Palos, L / Barzilov, A / Bowman, J D / Birge, N / Calarco, J R / Chupp, T E / Cianciolo, V / Coppola, C E / Crawford, C B / Craycraft, K / Evans, D /

Fieseler, C / Frlež, E / Garishvili, I / Gericke, M T W / Gillis, R C / Grammer, K B / Greene, G L / Hall, J / Hamblen, J / Hayes, C / Iverson, E B / Kabir, M L / Kucuker, S / Lauss, B / Mahurin, R / McCrea, M / Maldonado-Velázquez, M / Masuda, Y / Mei, J / Milburn, R / Mueller, P E / Musgrave, M / Nann, H / Novikov, I / Parsons, D / Penttilä, S I / Počanić, D / Ramirez-Morales, A / Root, M / Salas-Bacci, A / Santra, S / Schröder, S / Scott, E / Seo, P-N / Sharapov, E I / Simmons, F / Snow, W M / Sprow, A / Stewart, J / Tang, E / Tang, Z / Tong, X / Turkoglu, D J / Whitehead, R / Wilburn, W S

Physical review letters

2019 Volume 121, Issue 24, Page(s) 242002

Abstract: We report the first observation of the parity-violating gamma-ray asymmetry A_{γ}^{np} in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at the Spallation Neutron Source at Oak Ridge National Laboratory. A_{ ... ...

Abstract	We report the first observation of the parity-violating gamma-ray asymmetry A_{γ}^{np} in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at the Spallation Neutron Source at Oak Ridge National Laboratory. A_{γ}^{np} isolates the ΔI=1, ^{3}S_{1}→^{3}P_{1} component of the weak nucleon-nucleon interaction, which is dominated by pion exchange and can be directly related to a single coupling constant in either the DDH meson exchange model or pionless effective field theory. We measured A_{γ}^{np}=[-3.0±1.4(stat)±0.2(syst)]×10^{-8}, which implies a DDH weak πNN coupling of h_{π}^{1}=[2.6±1.2(stat)±0.2(syst)]×10^{-7} and a pionless EFT constant of C^{^{3}S_{1}→^{3}P_{1}}/C_{0}=[-7.4±3.5(stat)±0.5(syst)]×10^{-11} MeV^{-1}. We describe the experiment, data analysis, systematic uncertainties, and implications of the result.
Language	English
Publishing date	2019-01-04
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.121.242002
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Article ; Online: Measurement of the Vector and Tensor Asymmetries at Large Missing Momentum in Quasielastic (e[over →],e^{'}p) Electron Scattering from Deuterium.

DeGrush, A / Maschinot, A / Akdogan, T / Alarcon, R / Bertozzi, W / Booth, E / Botto, T / Calarco, J R / Clasie, B / Crawford, C / Dow, K / Farkhondeh, M / Fatemi, R / Filoti, O / Franklin, W / Gao, H / Geis, E / Gilad, S / Hasell, D K /

Karpius, P / Kohl, M / Kolster, H / Lee, T / Matthews, J / McIlhany, K / Meitanis, N / Milner, R / Rapaport, J / Redwine, R / Seely, J / Shinozaki, A / Sindile, A / Širca, S / Six, E / Smith, T / Tonguc, B / Tschalär, C / Tsentalovich, E / Turchinetz, W / Xiao, Y / Xu, W / Zhou, Z-L / Ziskin, V / Zwart, T

Physical review letters

2017 Volume 119, Issue 18, Page(s) 182501

Abstract: We report the measurement of the beam-vector and tensor asymmetries A_{ed}^{V} and A_{d}^{T} in quasielastic (e[over →],e^{'}p) electrodisintegration of the deuteron at the MIT-Bates Linear Accelerator Center up to missing momentum of 500 MeV/c. Data ... ...

Abstract	We report the measurement of the beam-vector and tensor asymmetries A_{ed}^{V} and A_{d}^{T} in quasielastic (e[over →],e^{'}p) electrodisintegration of the deuteron at the MIT-Bates Linear Accelerator Center up to missing momentum of 500 MeV/c. Data were collected simultaneously over a momentum transfer range 0.1<Q^{2}<0.5 (GeV/c)^{2} with the Bates Large Acceptance Spectrometer Toroid using an internal deuterium gas target polarized sequentially in both vector and tensor states. The data are compared with calculations. The beam-vector asymmetry A_{ed}^{V} is found to be directly sensitive to the D-wave component of the deuteron and has a zero crossing at a missing momentum of about 320 MeV/c, as predicted. The tensor asymmetry A_{d}^{T} at large missing momentum is found to be dominated by the influence of the tensor force in the neutron-proton final-state interaction. The new data provide a strong constraint on theoretical models.<br />
Language	English
Publishing date	2017-11-03
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.119.182501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering Determined by the OLYMPUS Experiment.

Henderson, B S / Ice, L D / Khaneft, D / O'Connor, C / Russell, R / Schmidt, A / Bernauer, J C / Kohl, M / Akopov, N / Alarcon, R / Ates, O / Avetisyan, A / Beck, R / Belostotski, S / Bessuille, J / Brinker, F / Calarco, J R / Carassiti, V / Cisbani, E /

Ciullo, G / Contalbrigo, M / De Leo, R / Diefenbach, J / Donnelly, T W / Dow, K / Elbakian, G / Eversheim, P D / Frullani, S / Funke, Ch / Gavrilov, G / Gläser, B / Görrissen, N / Hasell, D K / Hauschildt, J / Hoffmeister, Ph / Holler, Y / Ihloff, E / Izotov, A / Kaiser, R / Karyan, G / Kelsey, J / Kiselev, A / Klassen, P / Krivshich, A / Lehmann, I / Lenisa, P / Lenz, D / Lumsden, S / Ma, Y / Maas, F / Marukyan, H / Miklukho, O / Milner, R G / Movsisyan, A / Murray, M / Naryshkin, Y / Perez Benito, R / Perrino, R / Redwine, R P / Rodríguez Piñeiro, D / Rosner, G / Schneekloth, U / Seitz, B / Statera, M / Thiel, A / Vardanyan, H / Veretennikov, D / Vidal, C / Winnebeck, A / Yeganov, V

Physical review letters

2017 Volume 118, Issue 9, Page(s) 92501

Abstract: The OLYMPUS Collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, R_{2γ}, a direct measure of the contribution of hard two-photon exchange to the elastic cross section. In the OLYMPUS ... ...

Abstract	The OLYMPUS Collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, R_{2γ}, a direct measure of the contribution of hard two-photon exchange to the elastic cross section. In the OLYMPUS measurement, 2.01 GeV electron and positron beams were directed through a hydrogen gas target internal to the DORIS storage ring at DESY. A toroidal magnetic spectrometer instrumented with drift chambers and time-of-flight scintillators detected elastically scattered leptons in coincidence with recoiling protons over a scattering angle range of ≈20° to 80°. The relative luminosity between the two beam species was monitored using tracking telescopes of interleaved gas electron multiplier and multiwire proportional chamber detectors at 12°, as well as symmetric Møller or Bhabha calorimeters at 1.29°. A total integrated luminosity of 4.5 fb^{-1} was collected. In the extraction of R_{2γ}, radiative effects were taken into account using a Monte Carlo generator to simulate the convolutions of internal bremsstrahlung with experiment-specific conditions such as detector acceptance and reconstruction efficiency. The resulting values of R_{2γ}, presented here for a wide range of virtual photon polarization 0.456<ε<0.978, are smaller than some hadronic two-photon exchange calculations predict, but are in reasonable agreement with a subtracted dispersion model and a phenomenological fit to the form factor data.
Language	English
Publishing date	2017-03-03
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.118.092501
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Article: Measurement of Neutron Decay Parameters-The abBA Experiment.

Wilburn, W S / Bowman, J D / Mitchell, G S / O'Donnell, J M / Penttila, S I / Seo, P-N / Calarco, J R / Hersmann, F W / Chupp, T E / Cianciolo, T V / Rykaczewski, K P / Young, G R / De Souza, R T / Snow, W M / Desai, D / Greene, G L / Grzywacz, R K / Frlez, E / Pocanic, D /

Gentile, T R / Gudkov, V / Jones, G L

Journal of research of the National Institute of Standards and Technology

2005 Volume 110, Issue 4, Page(s) 389–393

Abstract: We are developing an experiment to measure the correlations a, A, and B, and the Fierz interference term b in neutron decay, with a precision of approximately 10(-4). The experiment uses an electromagnetic spectrometer in combination with two large-area ... ...

Abstract	We are developing an experiment to measure the correlations a, A, and B, and the Fierz interference term b in neutron decay, with a precision of approximately 10(-4). The experiment uses an electromagnetic spectrometer in combination with two large-area segmented silicon detectors to detect the proton and electron from the decay in coincidence, with 4π acceptance for both particles. For the neutron-polarization-dependent observables A and B, precision neutron polarimetry is achieved through the combination of a pulsed neutron beam, under construction at the SNS, and a polarized (3)He neutron polarizer. Measuring a and A in the same apparatus provides a redundant determination of λ = gA/gV . Uncertainty in λ dominates the uncertainty of CKM unitarity tests.
Language	English
Publishing date	2005-07
Publishing country	United States
Document type	Journal Article
ZDB-ID	1473724-3
ISSN	1044-677X ; 0160-1741
ISSN	1044-677X ; 0160-1741
DOI	10.6028/jres.110.058
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Precise measurement of deuteron tensor analyzing powers with BLAST.

Zhang, C / Kohl, M / Akdogan, T / Alarcon, R / Bertozzi, W / Booth, E / Botto, T / Calarco, J R / Clasie, B / Crawford, C / DeGrush, A / Dow, K / Farkhondeh, M / Fatemi, R / Filoti, O / Franklin, W / Gao, H / Geis, E / Gilad, S /

Hasell, D / Karpius, P / Kolster, H / Lee, T / Maschinot, A / Matthews, J / McIlhany, K / Meitanis, N / Milner, R / Rapaport, J / Redwine, R / Seely, J / Shinozaki, A / Sindile, A / Širca, S / Six, E / Smith, T / Tonguc, B / Tschalär, C / Tsentalovich, E / Turchinetz, W / Xiao, Y / Xu, W / Zhou, Z-L / Ziskin, V / Zwart, T

Physical review letters

2011 Volume 107, Issue 25, Page(s) 252501

Abstract: We report a precision measurement of the deuteron tensor analyzing powers T(20) and T(21) at the MIT-Bates Linear Accelerator Center. Data were collected simultaneously over a momentum transfer range Q=2.15-4.50 fm(-1) with the Bates Large Acceptance ... ...

Abstract	We report a precision measurement of the deuteron tensor analyzing powers T(20) and T(21) at the MIT-Bates Linear Accelerator Center. Data were collected simultaneously over a momentum transfer range Q=2.15-4.50 fm(-1) with the Bates Large Acceptance Spectrometer Toroid using a highly polarized deuterium internal gas target. The data are in excellent agreement with calculations in a framework of effective field theory. The deuteron charge monopole and quadrupole form factors G(C) and G(Q) were separated with improved precision, and the location of the first node of G(C) was confirmed at Q=4.19±0.05 fm(-1). The new data provide a strong constraint on theoretical models in a momentum transfer range covering the minimum of T(20) and the first node of G(C).
Language	English
Publishing date	2011-12-16
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.107.252501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Quasielastic 3He(e,e'p)2H reaction at Q2 = 1.5 GeV2 for recoil momenta up to 1 GeV/c.

Rvachev, M M / Benmokhtar, F / Penel-Nottaris, E / Aniol, K A / Bertozzi, W / Boeglin, W U / Butaru, F / Calarco, J R / Chai, Z / Chang, C C / Chen, J-P / Chudakov, E / Cisbani, E / Cochran, A / Cornejo, J / Dieterich, S / Djawotho, P / Duran, W / Epstein, M B /

Finn, J M / Fissum, K G / Frahi-Amroun, A / Frullani, S / Furget, C / Garibaldi, F / Gayou, O / Gilad, S / Gilman, R / Glashausser, C / Hansen, J-O / Higinbotham, D W / Hotta, A / Hu, B / Iodice, M / Iomni, R / de Jager, C W / Jiang, X / Jones, M K / Kelly, J J / Kox, S / Kuss, M / Laget, J M / De Leo, R / Lerose, J J / Liatard, E / Lindgren, R / Liyanage, N / Lourie, R W / Malov, S / Margaziotis, D J / Markowitz, P / Merchez, F / Michaels, R / Mitchell, J / Mougey, J / Perdrisat, C F / Punjabi, V A / Quéméner, G / Ransome, R D / Réal, J-S / Roché, R / Sabatié, F / Saha, A / Simon, D / Strauch, S / Suleiman, R / Tamae, T / Templon, J A / Tieulent, R / Ueno, H / Ulmer, P E / Urciuoli, G M / Voutier, E / Wijesooriya, K / Wojtsekhowski, B

Physical review letters

2005 Volume 94, Issue 19, Page(s) 192302

Abstract: We have studied the quasielastic 3He(e,e(')p)2H reaction in perpendicular coplanar kinematics, with the energy and the momentum transferred by the electron fixed at 840 MeV and 1502 MeV/c, respectively. The 3He(e,e(')p)2H cross section was measured for ... ...

Abstract	We have studied the quasielastic 3He(e,e(')p)2H reaction in perpendicular coplanar kinematics, with the energy and the momentum transferred by the electron fixed at 840 MeV and 1502 MeV/c, respectively. The 3He(e,e(')p)2H cross section was measured for missing momenta up to 1000 MeV/c, while the A(TL) asymmetry was extracted for missing momenta up to 660 MeV/c. For missing momenta up to 150 MeV/c, the cross section is described by variational calculations using modern 3He wave functions. For missing momenta from 150 to 750 MeV/c, strong final-state interaction effects are observed. Near 1000 MeV/c, the experimental cross section is more than an order of magnitude larger than predicted by available theories. The A(TL) asymmetry displays characteristic features of broken factorization with a structure that is similar to that generated by available models.
Language	English
Publishing date	2005-05-20
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.94.192302
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Article: Measurement of the 3He(e,e'p)pn reaction at high missing energies and momenta.

Benmokhtar, F / Rvachev, M M / Penel-Nottaris, E / Aniol, K A / Bertozzi, W / Boeglin, W U / Butaru, F / Calarco, J R / Chai, Z / Chang, C C / Chen, J-P / Chudakov, E / Cisbani, E / Cochran, A / Cornejo, J / Dieterich, S / Djawotho, P / Duran, W / Epstein, M B /

Physical review letters

2005 Volume 94, Issue 8, Page(s) 82305

Abstract: Results of the Jefferson Lab Hall A quasielastic 3He(e,e'p)pn measurements are presented. These measurements were performed at fixed transferred momentum and energy, q=1502 MeV/c and omega=840 MeV, respectively, for missing momenta p(m) up to 1 GeV/c and ...

Abstract	Results of the Jefferson Lab Hall A quasielastic 3He(e,e'p)pn measurements are presented. These measurements were performed at fixed transferred momentum and energy, q=1502 MeV/c and omega=840 MeV, respectively, for missing momenta p(m) up to 1 GeV/c and missing energies in the continuum region, up to pion threshold; this kinematic coverage is much more extensive than that of any previous experiment. The cross section data are presented along with the effective momentum density distribution and compared to theoretical models.
Language	English
Publishing date	2005-03-04
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.94.082305
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Compton-scattering cross section on the proton at high momentum transfer.

Danagoulian, A / Mamyan, V H / Roedelbronn, M / Aniol, K A / Annand, J R M / Bertin, P Y / Bimbot, L / Bosted, P / Calarco, J R / Camsonne, A / Chang, C C / Chang, T-H / Chen, J-P / Choi, Seonho / Chudakov, E / Degtyarenko, P / de Jager, C W / Deur, A / Dutta, D /

Egiyan, K / Gao, H / Garibaldi, F / Gayou, O / Gilman, R / Glamazdin, A / Glashausser, C / Gomez, J / Hamilton, D J / Hansen, J-O / Hayes, D / Higinbotham, D W / Hinton, W / Horn, T / Howell, C / Hunyady, T / Hyde, C E / Jiang, X / Jones, M K / Khandaker, M / Ketikyan, A / Kubarovsky, V / Kramer, K / Kumbartzki, G / Laveissière, G / Lerose, J / Lindgren, R A / Margaziotis, D J / Markowitz, P / McCormick, K / Meekins, D G / Meziani, Z-E / Michaels, R / Moussiegt, P / Nanda, S / Nathan, A M / Nikolenko, D M / Nelyubin, V / Norum, B E / Paschke, K / Pentchev, L / Perdrisat, C F / Piasetzky, E / Pomatsalyuk, R / Punjabi, V A / Rachek, I / Radyushkin, A / Reitz, B / Roche, R / Ron, G / Sabatié, F / Saha, A / Savvinov, N / Shahinyan, A / Shestakov, Y / Sirca, S / Slifer, K / Solvignon, P / Stoler, P / Tajima, S / Sulkosky, V / Todor, L / Vlahovic, B / Weinstein, L B / Wang, K / Wojtsekhowski, B / Voskanyan, H / Xiang, H / Zheng, X / Zhu, L

Physical review letters

2007 Volume 98, Issue 15, Page(s) 152001

Abstract: Cross-section values for Compton scattering on the proton were measured at 25 kinematic settings over the range s=5-11 and -t=2-7 GeV2 with a statistical accuracy of a few percent. The scaling power for the s dependence of the cross section at fixed ... ...

Abstract	Cross-section values for Compton scattering on the proton were measured at 25 kinematic settings over the range s=5-11 and -t=2-7 GeV2 with a statistical accuracy of a few percent. The scaling power for the s dependence of the cross section at fixed center-of-mass angle was found to be 8.0+/-0.2, strongly inconsistent with the prediction of perturbative QCD. The observed cross-section values are in fair agreement with the calculations using the handbag mechanism, in which the external photons couple to a single quark.
Language	English
Publishing date	2007-04-13
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.98.152001
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Article ; Online: Measurements of the electric form factor of the neutron up to Q2=3.4 GeV2 using the reaction 3He(e,e'n)pp.

Riordan, S / Abrahamyan, S / Craver, B / Kelleher, A / Kolarkar, A / Miller, J / Cates, G D / Liyanage, N / Wojtsekhowski, B / Acha, A / Allada, K / Anderson, B / Aniol, K A / Annand, J R M / Arrington, J / Averett, T / Beck, A / Bellis, M / Boeglin, W /

Breuer, H / Calarco, J R / Camsonne, A / Chen, J P / Chudakov, E / Coman, L / Crowe, B / Cusanno, F / Day, D / Degtyarenko, P / Dolph, P A M / Dutta, C / Ferdi, C / Fernández-Ramírez, C / Feuerbach, R / Fraile, L M / Franklin, G / Frullani, S / Fuchs, S / Garibaldi, F / Gevorgyan, N / Gilman, R / Glamazdin, A / Gomez, J / Grimm, K / Hansen, J-O / Herraiz, J L / Higinbotham, D W / Holmes, R / Holmstrom, T / Howell, D / de Jager, C W / Jiang, X / Jones, M K / Katich, J / Kaufman, L J / Khandaker, M / Kelly, J J / Kiselev, D / Korsch, W / LeRose, J / Lindgren, R / Markowitz, P / Margaziotis, D J / Beck, S May-Tal / Mayilyan, S / McCormick, K / Meziani, Z-E / Michaels, R / Moffit, B / Nanda, S / Nelyubin, V / Ngo, T / Nikolenko, D M / Norum, B / Pentchev, L / Perdrisat, C F / Piasetzky, E / Pomatsalyuk, R / Protopopescu, D / Puckett, A J R / Punjabi, V A / Qian, X / Qiang, Y / Quinn, B / Rachek, I / Ransome, R D / Reimer, P E / Reitz, B / Roche, J / Ron, G / Rondon, O / Rosner, G / Saha, A / Sargsian, M M / Sawatzky, B / Segal, J / Shabestari, M / Shahinyan, A / Shestakov, Yu / Singh, J / Sirca, S / Souder, P / Stepanyan, S / Stibunov, V / Sulkosky, V / Tajima, S / Tobias, W A / Udias, J M / Urciuoli, G M / Vlahovic, B / Voskanyan, H / Wang, K / Wesselmann, F R / Vignote, J R / Wood, S A / Wright, J / Yao, H / Zhu, X

Physical review letters

2010 Volume 105, Issue 26, Page(s) 262302

Abstract: The electric form factor of the neutron was determined from studies of the reaction 3He(e,e'n)pp in quasielastic kinematics in Hall A at Jefferson Lab. Longitudinally polarized electrons were scattered off a polarized target in which the nuclear ... ...

Abstract	The electric form factor of the neutron was determined from studies of the reaction 3He(e,e'n)pp in quasielastic 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 G(E)(n)=0.0236±0.0017(stat)±0.0026(syst), 0.0208±0.0024±0.0019, and 0.0147±0.0020±0.0014 for Q(2)=1.72, 2.48, and 3.41 GeV2, respectively.
Language	English
Publishing date	2010-12-31
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.105.262302
Database	MEDical Literature Analysis and Retrieval System OnLINE

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