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1. Investigation of the Exclusive He3(e,e′pn)H1 Reaction

Author

Middleton, D. G., Annand, J. R M, Antelo, M. Ases, Ayerbe, C., Barneo, P., Baumann, D., Bermuth, J., Bernauer, J., Blok, H. P., Böhm, R., Bosnar, D., Ding, M., Distler, M. O., Friedrich, J., Llongo, J. García, Glazier, D. I., Golak, J., Glöckle, W., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H A, Jans, E., Kamada, H., Mañas, G. Jover, Kohl, M., Lapikás, L., MacGregor, I. J D, Martin, I., McGeorge, J. C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Müller, U., Nogga, A., Pérez-Benito, R., Pospischil, Th, Potokar, M., Rosner, G., Seimetz, M., Skibiński, R., De Vries, H., Walcher, Th, Watts, D. P., Weinriefer, M., Weiss, M., Witała, H., and Zihlmann, B.

Subjects
Nuclear Theory, Physics and Astronomy(all), Nuclear Experiment
Abstract

Cross sections for the He3(e,e′pn)H1 reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming smaller at higher recoil proton momentum.

Published
2009
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2. Investigation of the Exclusive ^{3}He(e,e'pn)p Reaction

Author

Middleton, D. G., Annand, J. R. M., Antelo, M. Ases, Ayerbe, C., Barneo, P., Baumann, D., Bermuth, J., Bernauer, J., Blok, H. P., Bosnar, D., B��hm, R., Ding, M., Distler, M. O., Friedrich, J., Llongo, J. Garc��a, Glazier, D. I., Golak, J., Gl��ckle, W., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H. A., Jans, E., Kamada, H., Ma��as, G. Jover, Kohl, M., Lapik��s, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Merkel, H., Merle, P., Monstad, K., Moschini, F., M��ller, U., Nogga, A., Benito, R. P��rez, Pospischil, Th., Potokar, M., Rosner, G., Seimetz, M., Skibi��ski, R., de Vries, H., Walcher, Th., Watts, D. P., Weinriefer, M., Weiss, M., Wita��a, H., and Zihlmann, B.

Subjects
Nuclear Theory, FOS: Physical sciences, Physics::Accelerator Physics, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Cross sections for the ^{3}He(e,e'pn)p reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450 MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming much smaller at higher recoil momentum., 5, pages, 3 figures

Published
2009

3. Investigation of the Exclusive He-3(e, e ' pn)H-1 Reaction

Author

Middleton, D. G., Annand, J. R. M., Bosnar, D., Ding, M., Distler, M. O., Friedrich, J., Llongo, J. G., Glazier, D. I., Golak, J., Glöckle, W., Grabmayr, P., Hehl, T., Antelo, M. A., Heim, J., Hesselink, W. H. A., Jans, E., Kamada, H., Manas, G. Jover, Kohl, M., Lapikas, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Ayerbe, C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Müller, U., Nogga, A., Perez-Benito, R., Pospischil, Th., Potokar, M., Rosner, G., Barneo, P., Seimetz, M., Skibinski, R., de Vries, H., Walcher, Th., Watts, D. P., Weinriefer, M., Weiss, M., Witala, H., Zihlmann, B., Baumann, D., Bermuth, J., Bernauer, J., Blok, H. P., and Böhm, R.

Subjects
Nuclear Theory, ddc:550, Physics::Accelerator Physics, Nuclear Experiment
Abstract

Cross sections for the He-3(e, e' pn)H-1 reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450 MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming smaller at higher recoil proton momentum.

Published
2009
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4. Investigation of the Exclusive ^3He(e,e′pn)^1H Reaction

Author

Middleton, D. G., Annand, J. R. M., Antelo, M. Ases, Ayerbe, C., Barneo, P., Baumann, D., Bermuth, J., Bernauer, J., Blok, H. P., Böhm, R., Bosnar, D., Ding, M., Distler, M. O., Friedrich, J., García, Llongo J., Glazier, D. I., Golak, J., Glöckle, W., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H. A., Jans, E., Kamada, H., Jover, Mañas G., Kohl, M., Lapikás, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Müller, U., Nogga, A., Pérez-Benito, R., Pospischil, Th., Potokar, M., Rosner, G., Seimetz, M., Skibiński, R., de, Vries H., Walcher, Th., Watts, D. P., Weinriefer, M., Weiss, M., Witała, H., and Zihlmann, B.

Subjects
PRIRODNE ZNANOSTI. Fizika, Nuclear Theory, Physics::Accelerator Physics, Nuclear Experiment, NATURAL SCIENCES. Physics
Abstract

Cross sections for the ^3He(e,e′pn)^1H reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450 MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming smaller at higher recoil proton momentum.

Published
2009
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5. Investigation of the Exclusive ^{; ; ; 3}; ; ; He(e, e'pn)p Reaction

Author

Middleton, D.G., Annand, J.R.M., Ases Antelo, M., Ayerbe, C., Barneo, P., Baumann, D., Bermuth, J., Bernauer, J., Blok, H.P., Bosnar, Damir, Böhm, R., Ding, M., Distler, M.O., Friedrich, J., García Llongo, J., Glazier, D. G., Golak, J., Glöckle, W., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W.H.A., Jans, E., Kamada, H., Jover Mañ, As, G., Kohl, M., Lapikás, L., MacGregor, I.J.D., Martin, I., McGeorge, J.C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Müller, U., Nogga, A., Pérez Benito, R., Pospischil, Th., Potokar, M., Rosner, G., Seimetz, M., Skibiński, R., de Vries, H., Walcher, Th., Watts, D.P., Weinriefer, M., Weiss, M., Witała, H., and Zihlmann, B.

Subjects
Nuclear Theory, Physics::Accelerator Physics, nuclear reactions, inelastic electron scattering, few-body systems, Forces in hadronic systemf, Nuclear Experiment
Abstract

Cross sections for the ^{; ; ; 3}; ; ; He(e, e'pn)p reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450 MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming much smaller at higher recoil momentum.

Published
2009

6. Separated cross sections in ��^0 electroproduction at threshold at Q^2 = 0.05 GeV^2/c^2

Author

Weis, M., Bartsch, P., Baumann, D., Bermuth, J., Bernstein, A. M., Bohinc, K., B��hm, R., Ding, M., Distler, M. O., Ewald, I., Friedrich, J. M., Friedrich, J., Kahrau, M., Kohl, M., Krygier, K. W., Liesenfeld, A., Merkel, H., Merle, P., M��ller, U., Neuhausen, R., Pavan, M. M., Pospischil, Th., Potokar, M., Rosner, G., Schmieden, H., Seimetz, M., ��irca, S., Wagner, A., and Walcher, Th.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The differential cross sections ��_0=��_T+����_L, ��_{LT}, and ��_{TT} of ��^0 electroproduction from the proton were measured from threshold up to an additional center of mass energy of 40 MeV, at a value of the photon four-momentum transfer of Q^2= 0.05 GeV^2/c^2 and a center of mass angle of ��=90^\circ. By an additional out-of-plane measurement with polarized electrons ��_{LT'} was determined. This showed for the first time the cusp effect above the ��^+ threshold in the imaginary part of the s-wave. The predictions of Heavy Baryon Chiral Perturbation Theory are in disagreement with these data. On the other hand, the data are somewhat better predicted by the MAID phenomenological model and are in good agreement with the dynamical model DMT., 6 pages, 4 figures

Published
2007
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7. Measurement of the LT-asymmetry in pi(0) electroproduction at the energy of the Delta(1232)-resonance

Author

Elsner, D., Süle, A., Barneo, P., Bartsch, P., Baumann, D., Bermuth, J., Böhm, R., Bosnar, D., Ding, M., Distler, M., Drechsel, D., Ewald, I., Friedrich, J., Friedrich, J. M., Grözinger, S., Jennewein, P., Kamalov, S., Klein, F. H., Kohl, M., Krygier, K. W., Merkel, H., Merle, P., Müller, U., Neuhausen, R., Pospischil, Th., Potokar, M., Rosner, G., Schmieden, H., Strähle, M. Seimetz O., Tiator, L., Walcher, Th., and Weis, M.

Subjects
Meson production, Electromagnetic processes and properties, Baryon resonances, Nuclear Experiment
Abstract

The reaction p(e,e'p)pi^0 has been studied at Q^2=0.2 (GeV/c)^2 in the region of W=1232 MeV. From measurements left and right of q, cross section asymmetries \rho_LT have been obtained in forward kinematics \rho_LT(\theta_\pi^0=20deg) = (-11.68 +/- 2.36_stat +/- 2.36_sys)$ and backward kinematics \rho_LT(\theta_\pi^0=160deg) =(12.18 +/- 0.27_stat +/- 0.82_sys). Multipole ratios \Re(S_1+^* M_1+)/|M_1+|^2 and \Re(S_0+^* M_1+)/|M_1+|^2 were determined in the framework of the MAID2003 model. The results are in agreement with older data. The unusally strong negative \Re(S_0+^* M_1+)/|M_1+|^2 required to bring also the result of Kalleicher et al. in accordance with the rest of the data is almost excluded., Comment: 7 pages, 7 figures, 4 tables. Changed content. Accepted for publication in EPJA

Published
2006

8. Measurement of the LT-asymmetry in ��^0 electroproduction at the energy of the ��(1232) resonance

Author

Elsner, D., S��le, A., Barneo, P., Bartsch, P., Baumann, D., Bermuth, J., B��hm, R., Bosnar, D., Ding, M., Distler, M., Drechsel, D., Ewald, I., Friedrich, J., Friedrich, J. M., Gr��zinger, S., Jennewein, P., Kamalov, S., Klein, F. H., Kohl, M., Krygier, K. W., Merkel, H., Merle, P., M��ller, U., Neuhausen, R., Pospischil, Th., Potokar, M., Rosner, G., Schmieden, H., Str��hle, M. Seimetz O., Tiator, L., Walcher, Th., and Weis, M.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract

The reaction p(e,e'p)pi^0 has been studied at Q^2=0.2 (GeV/c)^2 in the region of W=1232 MeV. From measurements left and right of q, cross section asymmetries ��_LT have been obtained in forward kinematics ��_LT(��_��^0=20deg) = (-11.68 +/- 2.36_stat +/- 2.36_sys)$ and backward kinematics ��_LT(��_��^0=160deg) =(12.18 +/- 0.27_stat +/- 0.82_sys). Multipole ratios \Re(S_1+^* M_1+)/|M_1+|^2 and \Re(S_0+^* M_1+)/|M_1+|^2 were determined in the framework of the MAID2003 model. The results are in agreement with older data. The unusally strong negative \Re(S_0+^* M_1+)/|M_1+|^2 required to bring also the result of Kalleicher et al. in accordance with the rest of the data is almost excluded., 7 pages, 7 figures, 4 tables. Changed content. Accepted for publication in EPJA

Published
2005
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9. Final State Interaction Effects in pol 3He(pol e,e'p)

Author

Carasco, C., Bermuth, J., Merle, P., Bartsch, P., Baumann, D., Boehm, R., Bosnar, D., Ding, M., Distler, M. O., Friedrich, J., Friedrich, J. M., Golak, J., Gloeckle, W., Hauger, M., Heil, W., Jennewein, P., Jourdan, J., Kamada, H., Klein, A., Kohl, M., Krygier, K. W., Merkel, H., Mueller, U., Neuhausen, R., Nogga, A., Normand, Ch., Otten, E., Pospischil, Th., Potokar, M., Rohe, D., Schmieden, H., Schmiedeskamp, J., Seimetz, M., Sick, I., Sirca, S., Skibinski, R., Testa, G., Walcher, Th., Warren, G., Weis, M., Witala, H., Woehrle, H., and Zeier, M.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Asymmetries in quasi-elastic pol 3He(pol e,e'p) have been measured at a momentum transfer of 0.67 (GeV/c)^2 and are compared to a calculation which takes into account relativistic kinematics in the final state and a relativistic one-body current operator. With an exact solution of the Faddeev equation for the 3He-ground state and an approximate treatment of final state interactions in the continuum good agreement is found with the experimental data., Comment: 11 pages, 6 figures, submitted to Phys. Lett. B, revised version, sensitivity study to relativity and NN-potential added

Published
2003
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10. The neutron charge form factor and target analyzing powers from 3He-pol.(e-pol., e'n) scattering

Author

Bermuth, J., Merle, P., Carasco, C., Baumann, D., Bohm, D., Bosnar, Damir, Ding, M., Distler, M.O., Friedrich, J., Friedrich, J.M., Golak, J., Glockle, W., Hauger, M., Heil, W., Jennewein, P., Jourdan, J., Kamada, H., Klein, A., Kohl, M., Krusche, B., Krygier, K.W., Merkel, H., Muller, U., Neuhausen, R., Nogga, A., Normand, C., Otten, E., Pospischil, T., Potokar, M., Rohe, D., Schmieden, H., Schmiedeskamp, J., Seimetz, M., Sick, I., Sirca, S., Skibinski, R., Testa, G., Walcher, T., Warren, G., Weis, M., Witala, H., Wohrle, H., and Zeier M.

Subjects
Neutron charge form factor, Final-state interaction, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The charge form factor of the neutron has been determined from asymmetries measured in quasi-elastic 3He-pol.(e-pol., e'n) at a momentum transfer of 0.67(GeV/c)2. In addition, the target analysing power Ay0, has been measured to study effects of final state interactions and meson exchange currents.

Published
2003

11. Final state interaction effects in 3He-pol(e-pol, e'p)

Author

Carasco, C., Bermuth, J., Merle, P., Bartsch, P., Baumann, D., Bohm, R., Bosnar, Damir, Ding, M., Distler, M.O., Friedrich, J., Friedrich, J.M., Golak, J., Glockle, W., Hauger, M., Heil, W., Jennewein, P., Jourdan, J., Kamada, H., Klein, A., Kohl, M., Krygier, K.W., Merkel, H., Muller, U., Neuhausen, R., Nogga, A., Normand, C., Otten, E., Pospischil, T., Potokar, M., Rohe, D., Schmieden, H., Schmiedeskamp, J., Seimetz, M., Sick, I., Sirca, S., Skibinski, R., Testa, G., Walcher, T., Warren, G., Weis, M., Witala, H., and Wohrle, H.

Subjects
Polarized electron scattering, 3He-structure, Final-state interaction
Abstract

Asymmetries in quasi-elastic 3He-pol(e-pol, e'P)have been measured at a momentum transfer of 0.67 (GeV/c)2 and are compared to a calculation which takes into account relativistic kinematics in the final state and a relativistic one-body current operator. With an exact solution of the Faddeev equation for the 3He-ground state and an approximate treatment of final state interactions in the continuum good agreement is found with the experimental data.

Published
2003

12. Measurement of the beam helicity asymmetry in the p(e_pol), e' p)pi0 reaction at the energy of delta(1232) resonance

Author

Bartsch, P., Baumann, D., Bermuth, J., Bohm, R., Bohinc, K., Bosnar, Damir, Ding, M., Distler, M., Drechsel, D., Elsner, D., Ewald, I., Friedrich, J., Friedrich, J.M., Grozinger, S., Hedicke, S., Jennewein, P., Kahrau, M., Kamalov, S.S., Klein, F., Krygier, K.W., Liesenfeld, A., Merkel, H., Merle, P., Muller, U., Neuhausen, R., Pospischil, T., Potokar, M., Rosner, G., Schmieden, H., Seimetz, M., Sule, A., Tiator, L., Wagner, A., Walcher, T., and Weis M.

Subjects
Beam-helicity asymmetry, Delta particle, hadron models, Nuclear Experiment
Abstract

In a p(e_pol, e'p)pi_0 out-of-plane coincidence experiment at the 3-spectrometer setup of the Mainz Microtron MAMI, the beam-helicity asymmetry has been precisely measured around the energy of the Delta(1232) resonance and Q^2 = 0.2 (GeV/c)^2. The results are in disagreement with three up-to-date model calculations. This is interpreted as lack of understanding of the non-resonant background, which in dynamical models is related to the pion cloud.

Published
2002

13. Measurement of the beam-helicity asymmetry in the p(e_pol,e'p)pi_0 reaction at the energy of the Delta(1232) resonance

Author

Bartsch, P., Baumann, D., Bermuth, J., Boehm, R., Bohinc, K., Bosnar, D., Ding, M., Distler, M., Drechsel, D., Elsner, D., Ewald, I., Friedrich, J., Friedrich, J. M., Groezinger, S., Hedicke, S., Jennewein, P., Kahrau, M., Kamalov, S. S., Klein, F., Krygier, K. W., Liesenfeld, A., Merkel, H., Merle, P., Mueller, U., Neuhausen, R., Pospischil, Th., Potokar, M., Rosner, G., Schmieden, H., Seimetz, M., Suele, A., Tiator, L., Wagner, A., Walcher, Th., and Weis, M.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

In a p(e_pol,e'p)pi_0 out-of-plane coincidence experiment at the 3-spectrometer setup of the Mainz Microtron MAMI, the beam-helicity asymmetry has been precisely measured around the energy of the Delta(1232) resonance and Q^2 = 0.2 (GeV/c)^2. The results are in disagreement with three up-to-date model calculations. This is interpreted as lack of understanding of the non-resonant background, which in dynamical models is related to the pion cloud., 5 pages, 2 figures, 2 tables

Published
2001

14. Neutral pion threshold production at Q^2=0.05 GeV^2/c^2 and Chiral Perturbation Theory

Author

Merkel, Harald, Bartsch, Peter, Baumann, Dagmar, Bermuth, J��rg, Bernstein, Aron M., Bohinc, Klemen, B��hm, Ralph, Clawiter, Norbert, Derber, Sabine, Ding, Matthias, Distler, Michael O., Ewald, Ingo, Friedrich, Jan M., Friedrich, J��rg, Jennewein, Peter, Kahrau, Marco, Kohl, Michael, Krygier, Klaus Werner, Kuss, Michael, Liesenfeld, Arnd, Merle, Pascal, Miskimen, Rory A., M��ller, Ulrich, Neuhausen, Reiner, Pavan, Marcello M., Pospischil, Thomas, Potokar, Milan, Rosner, G��nther, Schmieden, Hartmut, Seimetz, Michael, ��irca, Simon, Wagner, Axel, Walcher, Thomas, and Weis, Markus

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

New data are presented on the p(e,e'p)\pi^0 reaction at threshold at a four-momentum transfer of Q^2=0.05 GeV^2/c^2. The data were taken with the three-spectrometer setup of the A1 Collaboration at the Mainz Microtron MAMI. The complete center of mass solid angle was covered up to a center of mass energy of 4 MeV above threshold. Combined with measurements at three different values of the virtual photon polarization \epsilon, the structure functions \sigma_T, \sigma_L, \sigma_{TT}, and \sigma_{TL} are determined. The results are compared with calculations in Heavy Baryon Chiral Perturbation Theory and with a phenomenological model. The measured cross section is significantly smaller than both predictions., Comment: 4 pages, 3 Postscript figures, latex2e, v2 minor changes

Published
2001

15. Measurement of the recoil polarization in the p(e, e'p)π0 reaction at the Δ(1232) resonance

Author

Pospischil, T.H., Bartsch, P., Baumann, D., Bermuth, J., Bohm, R., Bohinc, K., Derber, S., Ding, M., Distler, M., Drechsel, D., Elsner, D., Ewald, I., Friedrich, J., Friedrich, J.M., Geiges, R., Hedicke, S., Jennewein, P., Kahrau, M., Kamalov, S.S., Klein, F., Krygier, K.W., Lac, J., Liesenfeld, A., McIntyre, J., Merkel, H., Merle, P., Muller, U., Neuhausen, R., Potokar, M., Ransome, R.D., Rohe, D., Rosner, G., Schmieden, H., Seimetz, M., Sirca, S., Sick, I., Sule, A., Tiator, L., Wagner, A., Walcher, T., Warren, G.A., and Weis, M.

Subjects
QC
Abstract

The recoil proton polarization in the reaction P(e, elp)φ0 at the energy of the [Triangle Open] (1232) resonance was measured. Because of the spin precession in the magnetic spectrometer all three polarization components Px, Py, and Pz were simultaneously accessible. From Px the Coulomb quadrupole to magnetic dipole ratio was determined in the framework of the Mainz Unitary Isobar Model as colossal magnetoresistance (CMR)(Q2 = 0.121 GeV) = (-6.4 ± 0.7stat ± 0.8syst)%, which is in good agreement with the result obtained from the polarization ratio Px/Pz.

Published
2001

16. Polarization transfer in the $^{4}$He$(\vec{e},e' \vec{p}^{3}$H reaction

Author

Dieterich, S., Bartsch, P., Baumann, D., Bermuth, J., Bohinc, K., B��hm, R., Bosnar, D., Derber, S., Ding, M., Distler, M., Ewald, I., Friedrich, J., Friedrich, J. M., Gilman, R., Glashausser, C., Hauger, M., Jennewein, P., Jourdan, J., Kelly, J. J., Kohl, M., Kozlov, A., Krygier, K. W., Kumbartzki, G., Lac, J., Liesenfeld, A., Merkel, H., M��ller, U., Neuhausen, R., Pospischil, Th., Ransome, R. D., Rohe, D., Rosner, G., Schmieden, H., Seimetz, M., Sick, I., Strauch, S., Udias, J. M., Vignote, J. R., Wagner, A., Walcher, Th., Warren, G., and Weis, M.

Subjects
Nuclear Theory, FOS: Physical sciences, Physics::Accelerator Physics, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Polarization transfer in the 4He(e,e'p)3H reaction at a Q^2 of 0.4 (GeV/c)^2 was measured at the Mainz Microtron MAMI. The ratio of the transverse to the longitudinal polarization components of the ejected protons was compared with the same ratio for elastic ep scattering. The results are consistent with a recent fully relativistic calculation which includes a predicted medium modification of the proton form factor based on a quark-meson coupling model., 5 pages, Latex, 2 postscript figures, submitted to Physics Letters B

Published
2000

17. Measurement of the recoil polarization in the p (\vec e, e' \vec p) pi^0 reaction at the \Delta(1232) resonance

Author

Pospischil, Th., Bartsch, P., Baumann, D., Bermuth, J., Boehm, R., Bohinc, K., Derber, S., Ding, M., Distler, M., Drechsel, D., Elsner, D., Ewald, I., Friedrich, J., Friedrich, J. M., Geiges, R., Hedicke, S., Jennewein, P., Kahrau, M., Kamalov, S. S., Klein, F., Krygier, K. W., Lac, J., Liesenfeld, A., McIntyre, J., Merkel, H., Merle, P., Mueller, U., Neuhausen, R., Potokar, M., Ransome, R. D., Rohe, D., Rosner, G., Schmieden, H., Seimetz, M., Sirca, S., Sick, I., Suele, A., Tiator, L., Wagner, A., Walcher, Th, Warren, G. A., and Weis, M.

Subjects
Nuclear Experiment
Abstract

The recoil proton polarization has been measured in the p (\vec e,e'\vec p) pi^0 reaction in parallel kinematics around W = 1232 MeV, Q^2 = 0.121 (GeV/c)^2 and epsilon = 0.718 using the polarized c.w. electron beam of the Mainz Microtron. Due to the spin precession in a magnetic spectrometer, all three proton polarization components P_x/P_e = (-11.4 \pm 1.3 \pm 1.4) %, P_y = (-43.1 \pm 1.3 \pm 2.2) %, and P_z/P_e = (56.2 \pm 1.5 \pm 2.6) % could be measured simultaneously. The Coulomb quadrupole to magnetic dipole ratio CMR = (-6.4\pm 0.7_{stat}\pm 0.8_{syst}) % was determined from P_x in the framework of the Mainz Unitary Isobar Model. The consistency among the reduced polarizations and the extraction of the ratio of longitudinal to transverse response is discussed., Comment: 5 pages LaTeX, 1 table, 2 eps figures

Published
2000

18. Coherent ��^0 threshold production from the deuteron at Q^2 = 0.1 GeV^2/c^2

Author

Ewald, Ingo, Bartsch, Peter, Baumann, Dagmar, Bermuth, J��rg, Bernstein, Aron M., Bohinc, Klemen, B��hm, Ralph, Clawiter, Norbert, Derber, Sabine, Ding, Matthias, Distler, Michael O., Friedrich, Jan M., Friedrich, J��rg, Kahrau, Marco, Kohl, Michael, Kozlov, Alexander, Krygier, K. W., Liesenfeld, Arnd, Merkel, Harald, Merle, Pascal, M��ller, Ulrich, Neuhausen, Reiner, Pavan, Marcello, Pospischil, Thomas, Potokar, M., Rohe, Daniela, Rosner, G��nther, Schmieden, Hartmut, ��irca, Simon, Wagner, Axel, Walcher, Thomas, and Weis, Markus

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

First data on coherent threshold ��^0 electroproduction from the deuteron taken by the A1 Collaboration at the Mainz Microtron MAMI are presented. At a four-momentum transfer of q^2=-0.1 GeV^2/c^2 the full solid angle was covered up to a center-of-mass energy of 4 MeV above threshold. By means of a Rosenbluth separation the longitudinal threshold s wave multipole and an upper limit for the transverse threshold s wave multipole could be extracted and compared to predictions of Heavy Baryon Chiral Perturbation Theory., 7 pages, 7 figures, latex2e

Published
2000
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19. Measurement of the recoil polarization in the p (\vec e, e' \vec p) pi^0 reaction at the ��(1232) resonance

Author

Pospischil, Th., Bartsch, P., Baumann, D., Bermuth, J., Boehm, R., Bohinc, K., Derber, S., Ding, M., Distler, M., Drechsel, D., Elsner, D., Ewald, I., Friedrich, J., Friedrich, J. M., Geiges, R., Hedicke, S., Jennewein, P., Kahrau, M., Kamalov, S. S., Klein, F., Krygier, K. W., Lac, J., Liesenfeld, A., McIntyre, J., Merkel, H., Merle, P., Mueller, U., Neuhausen, R., Potokar, M., Ransome, R. D., Rohe, D., Rosner, G., Schmieden, H., Seimetz, M., Sirca, S., Sick, I., Suele, A., Tiator, L., Wagner, A., Walcher, Th, Warren, G. A., and Weis, M.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract

The recoil proton polarization has been measured in the p (\vec e,e'\vec p) pi^0 reaction in parallel kinematics around W = 1232 MeV, Q^2 = 0.121 (GeV/c)^2 and epsilon = 0.718 using the polarized c.w. electron beam of the Mainz Microtron. Due to the spin precession in a magnetic spectrometer, all three proton polarization components P_x/P_e = (-11.4 \pm 1.3 \pm 1.4) %, P_y = (-43.1 \pm 1.3 \pm 2.2) %, and P_z/P_e = (56.2 \pm 1.5 \pm 2.6) % could be measured simultaneously. The Coulomb quadrupole to magnetic dipole ratio CMR = (-6.4\pm 0.7_{stat}\pm 0.8_{syst}) % was determined from P_x in the framework of the Mainz Unitary Isobar Model. The consistency among the reduced polarizations and the extraction of the ratio of longitudinal to transverse response is discussed., 5 pages LaTeX, 1 table, 2 eps figures

Published
2000
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20. Investigation of the Exclusive 3He(e,e'pn)1H Reaction

Author

Middleton, D. G., Annand, J. R. M., Antelo, M. Ases, Ayerbe, C., Barneo, P., Baumann, D., Bermuth, J., Bernauer, J., Blok, H. P., Bohm, R., Bosnar, D., Ding, M., Distler, M. O., Friedrich, J., Llongo, J. Garcia, Glazier, D. I., Golak, J., Glockle, W., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H. A., Jans, E., Kamada, H., Manas, G. Jover, Kohl, M., Lapikas, L., Ian MacGregor, Martin, I., Mcgeorge, J. C., Merkel, H., Merle, P., Monstad, K., Moschini, F., Muller, U., Nogga, A., Perez-Benito, R., Pospischil, Th, Potokar, M., Rosner, G., Seimetz, M., Skibinski, R., Vries, H., Walcher, Th, Watts, D. P., Weinriefer, M., Weiss, M., Witala, H., Zihlmann, B., Kepler Centre for Astro and Particle Physics, Physikalisches Institut, Universität Tübingen, Department of Physics and Astronomy, University of Glasgow, Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Nikhef, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands, Department of Physics, VU-university, Department of Physics, University of Zagreb, M. Smoluchowski Institute of Physics, Jagiellonian University, Institut für Theoretische Physik II, Ruhr-Universität Bochum, Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, Institute for Advanced Simulation, Institut für Kernphysik, and Jülich Center for Hadron Physics, Forschungszentrum Jülich, and Institute Jožef Stefan, University of Ljubljana

Subjects
Nuclear Theory, Physics::Accelerator Physics, Nuclear Experiment
Abstract

Cross sections for the 3He(e,e[prime]pn)1H reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450 MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming smaller at higher recoil proton momentum.

Published
2009
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21. Measurement of the beam-helicity asymmetry in the p(e→,e′p)π0 reaction at the energy of the Δ(1232) resonance

Author

Bartsch, P., Baumann, D., Bermuth, J., Böhm, R., Bohinc, K., Bosnar, D., Ding, M., Distler, M., Drechsel, D., Elsner, D., Ewald, I., Jan Friedrich, Friedrich, J. M., Grözinger, S., Hedicke, S., Jennewein, P., Kahrau, M., Kamalov, S. S., Klein, F., Krygier, K. W., Liesenfeld, A., Merkel, H., Merle, P., Müller, U., Neuhausen, R., Pospischil, Th, Potokar, M., Rosner, G., Schmieden, H., Seimetz, M., Süle, A., Tiator, L., Wagner, A., Walcher, Th, and Weis, M.

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