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1. Thermonuclear reactionS30(p,γ)Cl31studied via Coulomb breakup ofCl31

Author

Ralf Plag, J. Benlliure, O. Lepyoshkina, T. Le Bleis, A. Klimkiewicz, G. Ickert, A. Kelic-Heil, Thomas Nilsson, F. Wamers, H. Simon, Michael Heil, V. Panin, Kristian Larsson, K. Sümmerer, Thomas Aumann, Y. Aksyutina, O. Ershova, Björn Jonson, J. V. Kratz, Roy Crawford Lemmon, J. Taylor, C. Wimmer, S. Schwertel, R. Krücken, J. Marganiec, Ushasi Datta Pramanik, Hans Geissel, D. Rossi, K. Boretzky, Rene Reifarth, B. Streicher, R. Kulessa, S. B. Novo, K. Mahata, Marielle Chartier, Roman Gernhäuser, W. Prokopowicz, Håkan T Johansson, J. R. Vignote, Christoph Langer, D. Cortina, P. Z. Wu, and V. Ricciardi

Subjects
Physics, Nuclear physics, Reaction rate, Nuclear and High Energy Physics, Thermonuclear fusion, Proton, Nucleosynthesis, Nuclear structure, Coulomb excitation, Atomic physics, rp-process, Excitation
Abstract

Coulomb breakup at high energy in inverse kinematics of proton-rich Cl-31 was used to constrain the thermonuclear S-30(p,gamma)Cl-31 capture reaction rate under typical Type I x-ray burst conditions. This reaction is a bottleneck during rapid proton-capture nucleosynthesis (rp process), where its rate depends predominantly on the nuclear structure of Cl-31. Two low-lying states just above the proton-separation threshold of S-p = 296( 50) keV in Cl-31 have been identified experimentally using the (RB)-B-3-LAND setup at the GSI Helmholtzzentrum fur Schwerionenforschung GmbH. Both states are considered to play a key role in the thermonuclear S-30( p,gamma)Cl-31 capture reaction. Excitation energies of the first J(pi) = 1/2(+), 5/2(+) states have been extracted and the reaction rate for proton capture on S-30 under typical rp-process temperatures has been investigated.

Published
2014
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2. Coulomb dissociation reactions on proton-rich Ar isotopes

Author

Michael Heil, Thomas Aumann, K. Sümmerer, J. Taylor, P. Z. Wu, Ralf Plag, J. Benlliure, O. Lepyoshkina, O. Ershova, J. V. Kratz, R. Kulessa, D. M. Rossi, Roy Crawford Lemmon, G. Ickert, V. Panin, T. Le Bleis, D. Cortina-Gil, Aleksandra Kelic, Y. Aksyutina, Hakaan Johansson, Haik Simon, Björn Jonson, Wimmer Christine, K. Mahata, Hans Geissel, K. Boretzky, B. Streicher, Rene Reifarth, S. Schwertel, J. R. Vignote, C. Langer, S. Beceiro, W. Prokopowicz, Roman Gernhaeuser, R. Kruecken, V. Ricciardi, K. Larsson, A. Klimkiewicz, Thomas Nilsson, F. Wamers, U. Datta-Pramanik, Marielle Chartier, and Helmholtz Association

Subjects
Isotope, Chemistry, Coulomb, Atomic physics, Dissociation (chemistry)
Abstract

5 pags., 3 figs., 1 tab. -- 11th Symposium on Nuclei in the Cosmos, 19-23 July 2010, Heidelberg, Germany, A Coulomb dissociation experiment on the proton-rich 32Ar and 34Ar isotopes was performed at the ALADIN-LAND setup at GSI in Darmstadt. Recent RQRPA calculations show a low-lying E1 soft-vibrational mode at an excitation energy Ex ≈ 9 MeV for proton-rich argon isotopes at the dripline. In a macroscopic picture, this can be understood as an out-of-phase oscillation of a thin proton skin against the isospin-saturated core, similar to the neutron pygmy resonance at the neutron dripline. On the other hand, the measured (γ, p) reactions are interesting for the calculation of reaction cross-sections and radiative proton capture rates for the rp-process. In this hydrogen burning process a lot of nuclear structure inputs are still missing. Especially in the argon region a bottleneck for the reaction flow is assumed at 30S and 34Ar. The impact of the predicted proton pygmy resonance on the reaction flow is not yet clear. The experimental motivation and the experiment itself are described. Identification plots for incoming and outgoing particles are shown and a tracking algorithm is applied and shows to work succesfully., This project is supported by the HGF Young Investigators Project VH-NG-327.

Published
2011

3. Precise Extraction of the Induced Polarization in theHe4(e,e′p→)H3Reaction

Author

P. Solvignon, Michael Paolone, E. Khrosinkova, Alexandre Camsonne, R. A. Lindgren, D. J. Margaziotis, J. R. Vignote, J. Glister, A. Saha, B. Craver, B. L. Berman, Bumsung Lee, Ronald Gilman, D. J. Tedeschi, C. E. Keppel, S. Strauch, X. Zhan, J. P. Chen, A. J. Sarty, C. E. Hyde-Wright, F. R. Wesselmann, R. Michaels, E. Cisbani, O. Glamazdin, E. Piasetzky, L. G. Tang, B. Briscoe, S. Malace, F. Cusanno, V. Tvaskis, Ronald Ransome, Yujie Qiang, Andrew Puckett, Xin Qian, E. J. Brash, X. Jiang, Bogdan Wojtsekhowski, E. Chudakov, K. Park, J. Arrington, E. Kuchina, C. W. de Jager, I. Albayrak, F. Garibaldi, C. F. Perdrisat, G. J. Kumbartzki, M. E. Christy, V. A. Punjabi, D. G. Meekins, Rolf Ent, P. E. Ulmer, Yordanka Ilieva, E. Schulte, Douglas Higinbotham, M. K. Jones, J. M. Udías, Lubomir Pentchev, and R. Subedi

Subjects
Physics, Quantum electrodynamics, General Physics and Astronomy, Impulse (physics), Atomic physics, Polarization (waves), Nuclear matter, Induced polarization, Charge exchange
Abstract

We measured with unprecedented precision the induced polarization P(y) in (4)He(e,e'p)(3)H at Q(2)=0.8 and 1.3 (GeV/c)(2). The induced polarization is indicative of reaction-mechanism effects beyond the impulse approximation. Our results are in agreement with a relativistic distorted-wave impulse approximation calculation but are overestimated by a calculation with strong charge-exchange effects. Our data are used to constrain the strength of the spin-independent charge-exchange term in the latter calculation.

Published
2011
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4. The electronion scattering experiment ELISe at the International Facility for Antiproton and Ion Research (FAIR) - A conceptual design study

Author

E. Garrido, Igor Meshkov, E. Khan, Pedro Sarriguren, B. Franzke, A. Chatillon, Marielle Chartier, M. Aiche, D. Doré, B. Jurado, Dirk Rudolph, I.A. Koop, S. N. Ershov, M. Fujiwara, Mikhail V. Zhukov, Roy Crawford Lemmon, R. Johnson, S. A. Krupko, D. N. Kadrev, S. Karataglidis, Yurii M. Shatunov, G. Belier, Thomas Nilsson, Oliver Kester, C. Schmitt, C. Fernandez Ramirez, E. Moya de Guerra, Norbert Pietralla, S. Czajkowski, F. Nolden, M. K. Gaidarov, Thomas Rauscher, G. P. A. Berg, E. Berthoumieux, Harald Merkel, D. Ridikas, I. Seleznev, Achim Richter, Andreas Zilges, F. Farget, A. Kelic-Heil, J. A. Caballero, L. V. Chulkov, Tatuya Adachi, V. Lisin, Helmut Weick, H. Lenske, Håkan T Johansson, Kai Hencken, Anton Nikolaev Antonov, K.-H. Schmidt, B. Krusche, A.A. Korsheninnikov, A. M. Rodin, Björn Jonson, Y. Litvinov, A.V. Otboev, P. Beller, Nasser Kalantar-Nayestanaki, U. Müller, Ch. Scheidenberger, L. V. Grigorenko, A. Dolinskii, N. Kurz, D. G. Jenkins, Laurent Tassan-Got, Pavel Golubev, N. V. Rudnev, Thomas Aumann, Andreas Martin Heinz, Seigo Kato, J. Taieb, A.N. Skrinsky, R. Alvarez Rodriguez, W. N. Catford, M. J. G. Borge, A. A. Ogloblin, J. Jourdan, A. V. Gorshkov, G. Münzenberg, Elena Litvinova, A. Letourneau, Takeshi Suda, A. Artukh, B. V. Danilin, G. Schrieder, A.N. Vorontsov, G. M. Ter-Akopian, P.V. Logatchov, D.I. Shvartz, S. Hamieh, K. Boretzky, Sergei Kamerdzhiev, A. N. Mushkarenkov, C. J. Barton, Peter Egelhof, Jim Al-Khalili, H. Emling, Paul Stevenson, Carlos A. Bertulani, Arnd R. Junghans, D. M. Cullen, E. Dupont, Dirk Trautmann, Joachim Enders, M. Steck, J. Udias-Moinelo, L.M. Fraile Prieto, M. O. Distler, Vasilii V. Parkhomchuk, Mohsen Harakeh, Göran Hugo Nyman, M. V. Ivanov, Vladimir Avdeichikov, Stefano Panebianco, Y. Sereda, J.E. Amaro Soriano, S.V. Shiyankov, D. Kiselev, A. S. Fomichev, E. Syresin, Hans Geissel, V. Volkov, L. Audouin, E. A. Kuzmin, Y. Teterev, S. Klygin, A. Polonski, A. A. Turinge, S. I. Sidorchuk, T. Granier, H. J. Wörtche, V. G. Nedorezov, P.Y. Shatunov, J. R. Vignote, J. Lopez Herraiz, A.M. Lallena Rojo, D.N. Shatilov, Haik Simon, Y. Grishkin, G. Barreau, S. V. Stepantsov, M. S. Golovkov, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), KVI - Center for Advanced Radiation Technology, Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear and High Energy Physics, electronscattering, FORM-FACTORS, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], DATA-ACQUISITION SYSTEM, NUCLEAR-STRUCTURE, 01 natural sciences, BINDING-ENERGIES, CHARGE-DENSITY DISTRIBUTIONS, Ion, CROSS-SECTIONS, Nuclear physics, Nuclei far off stability, Conceptual design, eA collider, 0103 physical sciences, CENTRAL DEPRESSION, Electron scattering, 010306 general physics, Instrumentation, Physics, 010308 nuclear & particles physics, Scattering, 29.27.-a, 25.30.Bf,25.30.Dh,21.10.Ft,29.20.Dh,29.30.-h, RELATIVISTIC HEAVY-IONS, EXOTIC NUCLEI, Facility for Antiproton and Ion Research, GIANT-RESONANCES, Storage ring
Abstract

The electronion scattering experiment ELISe is part of the installations envisaged at the new experimental storage ring at the International Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany. It offers an unique opportunity to use electrons as probe in investigations of the structure of exotic nuclei. The conceptual design and the scientific challenges of ELISe are presented. © 2011 Elsevier B.V. All rights reserved., The authors acknowledge financial support from the EC via the INTAS pro- gramme, grants No. 03-54-6545 and 05-1000008-8272. This work was partially supported by the Hessian LOEWE initiative Helmholtz International Center for FAIR

Published
2011
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5. Measurements of the Electric Form Factor of the Neutron up toQ2=3.4 GeV2Using the Reaction3He→(e→,e′n)pp

Author

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. Fernández-Ramírez, 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. de Jager, 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. M. Sargsian, B. Sawatzky, J. Segal, M. Shabestari, A. Shahinyan, Yu. Shestakov, J. Singh, S. Širca, P. Souder, S. Stepanyan, V. Stibunov, V. Sulkosky, S. Tajima, W. A. Tobias, J. M. Udias, G. M. Urciuoli, B. Vlahovic, H. Voskanyan, K. Wang, F. R. Wesselmann, J. R. Vignote, S. A. Wood, J. Wright, H. Yao, and X. Zhu

Subjects
Physics, Momentum transfer, Electric form factor, General Physics and Astronomy, Neutron, Atomic physics, Polarized target
Abstract

The electric form factor of the neutron was determined from studies of the reaction ${}^{3}\stackrel{\ensuremath{\rightarrow}}{\mathrm{He}}(\stackrel{\ensuremath{\rightarrow}}{e},{e}^{\ensuremath{'}}n)pp$ 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 ${Q}^{2}$ range over which it is known, we find ${G}_{E}^{n}=0.0236\ifmmode\pm\else\textpm\fi{}0.0017(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.0026(\mathrm{syst})$, $0.0208\ifmmode\pm\else\textpm\fi{}0.0024\ifmmode\pm\else\textpm\fi{}0.0019$, and $0.0147\ifmmode\pm\else\textpm\fi{}0.0020\ifmmode\pm\else\textpm\fi{}0.0014$ for ${Q}^{2}=1.72$, 2.48, and $3.41\text{ }\text{ }{\mathrm{GeV}}^{2}$, respectively.

Published
2010
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6. Relativistic description of 3He(e,e'p)2H

Author

E. Moya de Guerra, Pedro Sarriguren, J. M. Udias, Giovanni Salmè, J. R. Vignote, Emanuele Pace, R. Álvarez-Rodríguez, Eduardo Garrido, and A. Kievsky

Subjects
Physics, Proton, Nuclear Theory, 010308 nuclear & particles physics, media_common.quotation_subject, Scalar (mathematics), Física, Observable, 01 natural sciences, Asymmetry, Atomic and Molecular Physics, and Optics, Settore FIS/04 - Fisica Nucleare e Subnucleare, symbols.namesake, Dirac equation, Quantum electrodynamics, 0103 physical sciences, symbols, 010306 general physics, Wave function, Adiabatic process, Nucleon, Nuclear Experiment, media_common
Abstract

The relativistic distorted-wave impulse approximation is used to describe the 3He(e, e′ p)2H process. We describe the 3He nucleus within the adiabatic hyperspherical expansion method with realistic nucleon-nucleon interactions. The overlap between the 3He and the deuteron wave functions can be accurately computed from a three-body calculation. The nucleons are described by solutions of the Dirac equation with scalar and vector (S-V) potentials. The wave function of the outgoing proton is obtained by solving the Dirac equation with a S-V optical potential fitted to elastic proton scattering data on the residual nucleus. Within this theoretical framework, we compute the cross section of the reaction and other observables like the transverse-longitudinal asymmetry, and compare them with the available experimental data measured at JLab. © 2010 Springer-Verlag., This work was partly supported by funds provided by DGI of MEC (Spain) under Contracts No. FPA2007- 62216, FIS2008-01301 and the Spanish Consolider-Ingenio programme CPAN (Programme No. CSD2007-00042). R.A.R. and J.R.V. acknowledge support by Ministerio de Ciencia e Innovación (Spain) under the >Juan de la Cierva> programme

Published
2010

7. Precise extraction of the induced polarization in the 4He(e,e'p)3H reaction

Author

S P, Malace, M, Paolone, S, Strauch, I, Albayrak, J, Arrington, B L, Berman, E J, Brash, B, Briscoe, A, Camsonne, J-P, Chen, M E, Christy, E, Chudakov, E, Cisbani, B, Craver, F, Cusanno, R, Ent, F, Garibaldi, R, Gilman, O, Glamazdin, J, Glister, D W, Higinbotham, C E, Hyde-Wright, Y, Ilieva, C W, de Jager, X, Jiang, M K, Jones, C E, Keppel, E, Khrosinkova, E, Kuchina, G, Kumbartzki, B, Lee, R, Lindgren, D J, Margaziotis, D, Meekins, R, Michaels, K, Park, L, Pentchev, C F, Perdrisat, E, Piasetzky, V A, Punjabi, A J R, Puckett, X, Qian, Y, Qiang, R D, Ransome, A, Saha, A J, Sarty, E, Schulte, P, Solvignon, R R, Subedi, L, Tang, D, Tedeschi, V, Tvaskis, J M, Udias, P E, Ulmer, J R, Vignote, F R, Wesselmann, B, Wojtsekhowski, and X, Zhan

Abstract

We measured with unprecedented precision the induced polarization P(y) in (4)He(e,e'p)(3)H at Q(2)=0.8 and 1.3 (GeV/c)(2). The induced polarization is indicative of reaction-mechanism effects beyond the impulse approximation. Our results are in agreement with a relativistic distorted-wave impulse approximation calculation but are overestimated by a calculation with strong charge-exchange effects. Our data are used to constrain the strength of the spin-independent charge-exchange term in the latter calculation.

Published
2010

8. Polarization Transfer in theHe4(e→,e′p→)H3Reaction atQ2=0.8and1.3 (GeV/c)2

Author

V. Tvaskis, F. Garibaldi, Rolf Ent, A. Camsonne, J. R. Vignote, P. E. Ulmer, Y. Ilieva, B. L. Berman, R. Michaels, B. Craver, R. A. Lindgren, B. Briscoe, Andrew Puckett, K. Park, X. Zhan, X. Jiang, Jian-Ping Chen, L. Pentchev, E. Chudakov, J. Glister, C. E. Hyde-Wright, Ronald Ransome, Yi Qiang, O. Glamazdin, C. W. de Jager, Xin Qian, Bogdan Wojtsekhowski, D. G. Meekins, S. Strauch, M. E. Christy, D. J. Tedeschi, F. R. Wesselmann, L. G. Tang, Byounghoon Lee, Cynthia Keppel, V. A. Punjabi, E. Kuchina, J. Arrington, E. J. Brash, E. Cisbani, G. Kumbartzki, S. Malace, C. F. Perdrisat, F. Cusanno, E. Schulte, P. Solvignon, Ronald Gilman, R. Subedi, A. J. Sarty, Douglas Higinbotham, M. K. Jones, D. J. Margaziotis, J. M. Udías, Michael Paolone, E. Khrosinkova, Eli Piasetzky, Arijit Saha, and I. Albayrak

Subjects
Nuclear reaction, Physics, Proton, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Fermion, Nuclear physics, Baryon, Atomic physics, Nuclear Experiment, Nucleon, Dimensionless quantity
Abstract

Here, proton recoil polarization was measured in the quasielastic 4He(e→,e'p→)3H reaction at Q2 = 0.8 (GeV/c)2 and 1.3 (GeV/c)2 with unprecedented precision. The polarization-transfer coefficients are found to differ from those of the 1H(e→,e'p→) reaction, contradicting a relativistic distorted-wave approximation, and favoring either the inclusion of medium-modified proton form factors predicted by the quark-meson coupling model or a spin-dependent charge-exchange final-state interaction. For the first time, the polarization-transfer ratio is studied as a function of the virtuality of the proton.

Published
2010
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9. Measurements of the electric form factor of the neutron up to Q2=3.4 GeV2 using the reaction 3He(e,e'n)pp

Author

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, Fernández-Ramírez, 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, de Jager, 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 M, Sargsian, B, Sawatzky, J, Segal, M, Shabestari, A, Shahinyan, Yu, Shestakov, J, Singh, S, Sirca, P, Souder, S, Stepanyan, V, Stibunov, V, Sulkosky, S, Tajima, W A, Tobias, J M, Udias, G M, Urciuoli, B, Vlahovic, H, Voskanyan, K, Wang, F R, Wesselmann, J R, Vignote, S A, Wood, J, Wright, H, Yao, and X, Zhu

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.

Published
2010

10. Dynamics of the quasielasticO16(e,e′p)reaction atQ2≈0.8(GeV∕c)2

Author

A. V. Glamazdin, E. A.J.M. Offermann, Seigo Kato, D. M. Manley, H. Fonvieille, R. Roche, S. Malov, P.Y. Bertin, E. Burtin, M. Holtrop, J. Gomez, Jing Zhao, Nilanga Liyanage, R. W. Lourie, R. Michaels, S. Jaminion, R. Holmes, T. Terasawa, Vincent Breton, D. J. Margaziotis, Branislav Vlahovic, H. Voskanyan, C. Jutier, W. Kahl, F. T. Baker, C. F. Perdrisat, Leonid Levchuk, J. M. Finn, R. I. Pomatsalyuk, V. A. Punjabi, K. Joo, David L. Prout, Olivier Ravel, H. Ueno, Bogdan Wojtsekhowski, K. McCormick, P. Vernin, P. E. Ulmer, S. K. Nanda, S. Kerhoas, J. Y. Mougey, L. B. Auerbach, A. Leone, T. Pussieux, L. S. Cardman, Y. Roblin, S. van Verst, R. A. Lindgren, J. J. LeRose, G. M. Huber, Z. Papandreou, J. A. Templon, F. Garibaldi, T. Saito, M. Khayat, Dimitri Debruyne, P. M. Rutt, V. Gorbenko, B. Frois, Kevin Fissum, D. Neyret, G. G. Petratos, A. Saha, Z. E. Meziani, B. Diederich, C. E. Hyde-Wright, G. Rutledge, L. Bimbot, James J. Kelly, K. Kino, M. Liang, Wolfgang Korsch, J. S. McCarthy, T. P. Smith, G. Quéméner, S. Platchkov, Mauro Iodice, Kazushige Maeda, L. Todor, K. Wijesooriya, Justin I. McIntyre, J. W. Watson, Larry Weinstein, J. Martino, C. R. Howell, Hiroaki Tsubota, J. P. Chen, J. R. Calarco, N. d'Hose, Jan Ryckebusch, Z. L. Zhou, G. M. Urciuoli, D. G. Zainea, Ronald Gilman, Ronald Ransome, R. L.J. van der Meer, C. C. Chang, D. Rowntree, K. S. Kumar, J. Gao, B. D. Anderson, G. J. Lolos, M. B. Epstein, Pavel Sorokin, Laird Kramer, G. J. Kumbartzki, G. Laveissière, M. K. Jones, A. Gasparian, R. Madey, William Bertozzi, W. U. Boeglin, Pete Markowitz, D. S. Dale, M. Khandaker, V. Zeps, Roberto Perrino, R. De Leo, E. Cisbani, J. Berthot, S. Frullani, H. Breuer, E. J. Brash, J. R. Vignote, T. P. Gorringe, J. M. Udías, F. W. Hersman, L. A. Ewell, J. Domingo, Gordon D. Cates, Paul Souder, A. Serdarevic-Offermann, A. Deur, C. Cavata, A. Soldi, J.E. Ducret, A. J. Sarty, P. Djawotho, C. Glashausser, R. Suleiman, Shalev Gilad, C. W. de Jager, and K. A. Aniol

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Two-body problem, 01 natural sciences, Asymmetry, Eikonal approximation, Nuclear physics, Classical mechanics, 0103 physical sciences, Isobar, 010306 general physics, Relativistic quantum chemistry, Glauber, Oxygen-16, media_common
Abstract

The physics program in Hall A at Jefferson Lab commenced in the summer of 1997 with a detailed investigation of the ^(16)O(e,e′p) reaction in quasielastic, constant (q,ω) kinematics at Q^2≈0.8(GeV/c)^2, q≈1GeV/c, and ω≈445MeV. Use of a self-calibrating, self-normalizing, thin-film waterfall target enabled a systematically rigorous measurement. Five-fold differential cross-section data for the removal of protons from the 1p-shell have been obtained for 0

Published
2004
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11. Polarization Transfer in theHe4(e→,e′p→)H3Reaction up toQ2=2.6 (GeV/c)2

Author

S. Strauch, Kevin Fissum, James J. Kelly, Paul Gueye, K. Wijesooriya, J. O. Hansen, G. Rosner, F. Garibaldi, Ronald Ransome, A. J. Sarty, C. E. Keppel, J. Nappa, C. Jones, J. D. Kellie, R. Michaels, D. P. Watts, William Bertozzi, T. A. Forest, D. J. Margaziotis, Bogdan Wojtsekhowski, K. Livingston, E. Chudakov, C. Glashausser, M. Boswell, V. Gorbenko, J. M. Finn, Ronald Gilman, Nilanga Liyanage, D. Meekins, J. R. Vignote, M. B. Epstein, J. H. Mitchell, C. Jackson, J. LeRose, Douglas Higinbotham, M. K. Jones, R. De Leo, V. A. Punjabi, J. M. Udías, J. Gomez, J. F. J. van den Brand, Jrm Annand, Z. Chai, S. Frullani, M. Kuss, X. Jiang, Rolf Ent, Shalev Gilad, C. W. de Jager, R. Roche, B. Hu, F. Sabatié, A. Gasparian, A. Cochran, K. A. Aniol, Olivier Gayou, Jian-Ping Chen, Larry Weinstein, M. E. Christy, O. K. Baker, S. Malov, C. F. Perdrisat, G. M. Urciuoli, G. Kumbartzki, E. J. Brash, D. G. Ireland, C. E. Hyde-Wright, Sonja Dieterich, Arijit Saha, S. Nanda, M. Rvachev, and P. E. Ulmer

Subjects
Nuclear physics, Physics, Nuclear Theory, General Physics and Astronomy, High Energy Physics::Experiment, Atomic physics, Proton recoil, Nuclear Experiment, Polarization (waves)
Abstract

We have measured the proton recoil polarization in the 4He(e-->,e(')p-->)4H reaction at Q(2)=0.5, 1.0, 1.6, and 2.6 (GeV/c)(2). The measured ratio of polarization transfer coefficients differs from a fully relativistic calculation, favoring the inclusion of a medium modification of the proton form factors predicted by a quark-meson coupling model. In addition, the measured induced polarizations agree reasonably well with the fully relativistic calculation indicating that the treatment of final-state interactions is under control.

Published
2003
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12. Relativity in Polarized Electron Scattering Observables

Author

J. A. Caballero, María Carmen del Camino Martínez, J. R. Vignote, T.W. Donnelly, Jose Manuel Udias, and E. Moya de Guerra

Subjects
Physics, Theory of relativity, Scattering, Quantum electrodynamics, Quantum mechanics, Nuclear Theory, Relativistic dynamics, Electron, Polarization (waves), Wave function, Nucleon, Relativistic quantum chemistry
Abstract

Coincidence scattering of polarized electrons from nuclei with polarization transfer to outgoing nucleons is studied within the context of relativistic mean field theory. Effects introduced by the dynamical enhancement of the lower components of the bound and scattered nucleon wave functions are analyzed for the polarized response functions and transferred polarization asymmetries. Results obtained by projecting out the negative-energy components are compared with the fully-relativistic calculation. The crucial role played by the relativistic dynamics in some spin-dependent observables is clearly manifested even for low/medium values of the missing momentum. Kinematical relativistic effects are also analyzed. A discussion of the factorization approach and the mechanism for its breakdown is also briefly presented.

Published
2003
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13. Quasi elastic cross sections for the209Bi(e,e'p)208Pbreaction: Jefferson Lab experiment E06007

Author

K A Aniol, Joaquin L. Herraiz, J R Vignote, Arijit Saha, J. M. Udías, Alexandre Camsonne, J C Cornejo, and G Urciuoli

Subjects
Nuclear physics, Physics, History, Proton, Atomic physics, Orbit (control theory), Nuclear Experiment, Ground state, Computer Science Applications, Education
Abstract

6 pags., 4 figs., 1 tab. -- Rutherford Centennial Conference on Nuclear Physics 8–12 August 2011, Manchester, UK, Quasi elastic cross sections were measured for the first time for both negative and positive missing momenta for the 209Bi(e, e′p) 208P b reaction leading to the ground state and hole states of 208P b. Experimental cross sections obtained between -0.3 GeV/c to 0.3 GeV/c agree with theoretical calculations using RDWIA techniques both in shape and magnitude for the ground state. The data for the ground state production of 208P b are consistent with a theoretical model assuming a single proton(1.06 ± 0.10) in the 1h9/2 orbit in 209Bi.

Published
2012
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