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159 results on '"Hesselink, W. H. A."'

1. 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., Böhm, R., 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., Benito, R. Pérez, 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 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., Comment: 5, pages, 3 figures

Published
2009
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2. Kekul\'e Cells for Molecular Computation

Author

Hesselink, W. H., Hummelen, J. C., Jonkman, H. T., Reker, H. G., de Lavalette, G. R. Renardel, and van der Veen, M. H.

Subjects
Computer Science - Other Computer Science, Computer Science - Discrete Mathematics
Abstract

The configurations of single and double bonds in polycyclic hydrocarbons are abstracted as Kekul\'e states of graphs. Sending a so-called soliton over an open channel between ports (external nodes) of the graph changes the Kekul\'e state and therewith the set of open channels in the graph. This switching behaviour is proposed as a basis for molecular computation. The proposal is highly speculative but may have tremendous impact. Kekul\'e states with the same boundary behaviour (port assignment) can be regarded as equivalent. This gives rise to the abstraction of Kekul\'e cells. The basic theory of Kekul\'e states and Kekul\'e cells is developed here, up to the classification of Kekul\'e cells with $\leq 4$ ports. To put the theory in context, we generalize Kekul\'e states to semi-Kekul\'e states, which form the solutions of a linear system of equations over the field of the bits 0 and 1. We briefly study so-called omniconjugated graphs, in which every port assignment of the right signature has a Kekul\'e state. Omniconjugated graphs may be useful as connectors between computational elements. We finally investigate some examples with potentially useful switching behaviour., Comment: Also on chemistry (unsaturated polycyclic hydrocarbons)

Published
2007

3. 16O(e,e'p) reaction at large missing energy

Author

Iodice, M., Cisbani, E., De Leo, R., Frullani, S., Garibaldi, F., Groep, D. L., Hesselink, W. H. A., Jans, E., Lapikas, L., Onderwater, C. J. G., Perrino, R., Ryckebusch, J., Starink, R., and Urciuoli, G. M.

Subjects
Nuclear Experiment
Abstract

We investigate the origin of the strength at large missing energies in electron-induced proton knockout reactions. For that purpose the reaction 16O(e,e'p) was studied at a central value omega=210 MeV of the energy transfer, and two values of the momentum transfer: q=300, 400 MeV/c, corresponding to the "dip region". Differential cross sections were determined in a large range of missing energy (Em=0-140 MeV) and proton emission angle (gamma_pq =0-110 deg), and compared to predictions of a model that includes nucleon-nucleon short-range correlations and two-body currents. It is observed that, in the kinematic domain covered by this experiment, the largest contribution to the cross section stems from two-body currents, while short-range correlations contribute a significant fraction, Comment: submitted to Physics Letters B

Published
2007
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4. First measurements of the ^16O(e,e'pn)^14N reaction

Author

Middleton, D. G., Annand, J. R. M., Barbieri, C., Barneo, P., Bartsch, P., Bauman, D., Bermuth, J., Bosnar, D., Blok, H. P., Bohm, R., Ding, M., Distler, M. O., Elsner, D., Friedrich, J., Giusti, C., Glazier, D. I., Grabmayr, P., Grozinger, S., Hehl, T., Heim, J., Hesselink, W. H. A, Jans, E., Klein, F., Kohl, M., Lapikas, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Merkel, H., Merle, P., Moschini, F., Muller, U., Pospischil, Th., Rosner, G., Schmieden, H., Seimetz, M., Sule, A., de Vries, H., Walcher, Th., Watts, D. P., Weis, M., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

This paper reports on the first measurement of the ^16O(e,e'pn)^14N reaction. Data were measured in kinematics centred on a super-parallel geometry at energy and momentum transfers of 215 MeV and 316 MeV/c. The experimental resolution was sufficient to distinguish groups of states in the residual nucleus but not good enough to separate individual states. The data show a strong dependence on missing momentum and this dependence appears to be different for two groups of states in the residual nucleus. Theoretical calculations of the reaction using the Pavia code do not reproduce the shape or the magnitude of the data., Comment: 10 pages, 11 figures, 2 tables, Accepted for publication in EPJA

Published
2007
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5. Investigation of the Exclusive 3He(e,e'pp)n Reaction

Author

Groep, D. L., van Batenburg, M. F., Bauer, Th. S., Blok, H. P., Boersma, D. J., Cisbani, E., De Leo, R., Frullani, S., Garibaldi, F., Gloeckle, W., Golak, J., Heimberg, P., Hesselink, W. H. A., Iodice, M., Ireland, D. G., Jans, E., Kamada, H., Lapikas, L., Lolos, G. J., Onderwater, C. J. G., Perrino, R., Scott, A., Starink, R., Steenbakkers, M. F. M., Urciuoli, G. M., de Vries, H., Weinstein, L. B., and Witala, H.

Subjects
Nuclear Experiment
Abstract

Cross sections for the 3He(e,e'pp)n reaction were measured over a wide range of energy and three- momentum transfer. At a momentum transfer q=375 MeV/c, data were taken at transferred energies omega ranging from 170 to 290 MeV. At omega=220 MeV, measurements were performed at three q values (305, 375, and 445 MeV/c). The results are presented as a function of the neutron momentum in the final-state, as a function of the energy and momentum transfer, and as a function of the relative momentum of the two-proton system. The data at neutron momenta below 100 MeV/c, obtained for two values of the momentum transfer at omega=220 MeV, are well described by the results of continuum-Faddeev calculations. These calculations indicate that the cross section in this domain is dominated by direct two-proton emission induced by a one-body hadronic current. Cross section distributions determined as a function of the relative momentum of the two protons are fairly well reproduced by continuum-Faddeev calculations based on various realistic nucleon-nucleon potential models. At higher neutron momentum and at higher energy transfer, deviations between data and calculations are observed that may be due to contributions of isobar currents., Comment: 14 pages, 1 table, 17 figures

Published
2000
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6. Investigation of the Exclusive 3He(e,e'pp) Reaction

Author

Groep, D. L., van Batenburg, M. F., Bauer, Th. S., Blok, H. P., Boersma, D. J., Cisbani, E., De Leo, R., Frullani, S., Garibaldi, F., Gloeckle, W., Golak, J., Heimberg, P., Hesselink, W. H. A., Iodice, M., Ireland, D. G., Jans, E., Kamada, H., Lapikas, L., Lolos, G. J., Perrino, R., Scott, A., Starink, R., Steenbakkers, M. F. M., Urciuoli, G. M., de Vries, H., Weinstein, L. B., and Witala, H.

Subjects
Nuclear Experiment
Abstract

Cross sections for the 3He(e,e'pp)n reaction were measured at an energy transfer of 220 MeV and three-momentum transfers q of 305, 375, and 445 MeV/c. Results are presented as a function of q and the final-state neutron momentum for slices in specific kinematic variables. At low neutron momenta, comparison of the data to results of continuum Faddeev calculations performed with the Bonn-B nucleon-nucleon potential indicates a dominant role for two-proton knockout induced by a one-body hadronic current., Comment: 4 pages, 3 figures

Published
1999
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7. The $^4$He$(e,e'p)$ Cross Section at Large Missing Energy

Author

van Leeuwe, J. J., Blok, H. P., Brand, J. F. J. van den, Bulten, H. J., Dodge, G. E., Ent, R., Hesselink, W. H. A., Jans, E., Kasdorp, W. J., Laget, J. M., Lapikás, L., Onderwater, C. J. G., Pellegrino, A. R., Spaltro, C. M., Steijger, J. J. M., Templon, J. A., and Unal, O.

Subjects
Nuclear Experiment
Abstract

The $(e,e'p)$ reaction on $^{4}{He}$ nuclei was studied in kinematics designed to emphasize effects of nuclear short-range correlations. The measured cross sections display a peak in the kinematical regions where two-nucleon processes are expected to dominate. Theoretical models incorporating short-range correlation effects agree reasonably with the data., Comment: 4 pages LaTeX, using espcrc1.sty and wrapfig.sty (included), two figures. Talk presented by J. Templon at the 15th Int. Conf. on Few-Body Problems in Physics, Groningen, The Netherlands, 22-26 July, 1997

Published
1997
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8. Two-nucleon knockout contributions to the $^{12}$C$(e,e'p)$ reaction in the dip and {$\Delta$}(1232) regions

Author

Ryckebusch, J., Van der Sluys, V., Waroquier, M., Kester, L. J. H. M., Hesselink, W. H. A., Jans, E., and Zondervan, A.

Subjects
Nuclear Theory
Abstract

The contributions from $^{12}$C$(e,e'pn)$ and $^{12}$C$(e,e'pp)$ to the semi-exclusive $^{12}$C$(e,e'p)$ cross section have been calculated in an unfactorized model for two-nucleon emission. We assume direct two-nucleon knockout after virtual photon coupling with the two-body pion-exchange currents in the target nucleus. Results are presented at several kinematical conditions in the dip and $\Delta$(1232) regions. The calculated two-nucleon knockout strength is observed to account for a large fraction of the measured $(e,e'p)$ strength above the two-nucleon emission threshold., Comment: 12 Revtex pages, 4 postscript figures (available upon request), University of Gent preprint SSF94-02-01

Published
1994
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9. Lock-Free Parallel Garbage Collection

Author

Gao, H., Groote, J. F., Hesselink, W. H., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Pan, Yi, editor, Chen, Daoxu, editor, Guo, Minyi, editor, Cao, Jiannong, editor, and Dongarra, Jack, editor

Published
2005
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10. A General Algorithm for Computing Distance Transforms in Linear Time

Author

Meijster, A., Roerdink, J. B. T. M., Hesselink, W. H., Viergever, Max A., editor, Bajcsy, Ruzena, editor, Brady, Mike, editor, Faugeras, Olivier D., editor, Koenderink, Jan J., editor, Pizer, Stephen M., editor, Tsuji, Saburo, editor, Zucker, Steven W., editor, Goutsias, John, editor, Vincent, Luc, editor, and Bloomberg, Dan S., editor

Published
2000
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11. Electron-induced two-proton knockout from 3He

Author

Groep, D. L., van Batenburg, M. F., Bauer, Th. S., Blok, H. P., Boersma, D. J., Cisbani, E., Leo, R. De, Frullani, S., Garibaldi, F., Glöckle, W., Golak, J., Heimberg, P., Hesselink, W. H. A., Iodice, M., Ireland, D., Jans, E., Kamada, H., Lapikás, L., Lolos, G., Perrino, R., Scott, A., Starink, R., Steenbakkers, M. F. M., Urciuoli, G. M., de Vries, H., Weinstein, L. B., Witala, H., Plessas, W., editor, Desplanques, Bertrand, editor, Protasov, Konstantin, editor, Silvestre-Brac, Bernard, editor, and Carbonell, Jaume, editor

Published
1999
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13. High Missing-Momentum Components in 4He Studied with the (e, e′p) Reaction

Author

van Leeuwe, J. J., Blok, H. P., van den Brand, J. F. J., Bulten, H. J., Dodge, G. E., Ent, R., Hesselink, W. H. A., Jans, E., Kasdorp, W.-J., Laget, J. M., Lapikás, L., Onderwater, C. J. G., Pellegrino, A., Spaltro, C. M., Steijger, J. J. M., Templon, J. A., Unal, O., Mitter, H., editor, Plessas, W., editor, and Guardiola, Rafael, editor

Published
1996
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14. Spin density matrix elements in exclusive ρ 0 electroproduction on 1H and 2H targets at 27.5 GeV beam energy

Author

Airapetian, A., Akopov, N., Akopov, Z., Andrus, A., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetissian, E., Belostotski, S., Bianchi, N., Blok, H. P., Böttcher, H., Bonomo, C., Borissov, A., Brüll, A., Bryzgalov, V., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., Demey, M., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Dreschler, J., Düren, M., Ehrenfried, M., Elalaoui-Moulay, A., Elbakian, G., Ellinghaus, F., Elschenbroich, U., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Funel, A., Gabbert, D., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Grebeniouk, O., Gregor, I. M., Guler, H., Hadjidakis, C., Hartig, M., Hasch, D., Hasegawa, T., Hesselink, W. H. A., Hill, G., Hillenbrand, A., Hoek, M., Holler, Y., Hommez, B., Hristova, I., Iarygin, G., Imazu, Y., Ivanilov, A., Izotov, A., Jackson, H. E., Jgoun, A., Kaiser, R., Keri, T., Kinney, E., Kisselev, A., Kobayashi, T., Kopytin, M., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lamb, R., Lapikás, L., Lehmann, I., Lenisa, P., Liebing, P., Linden-Levy, L. A., Lorenzon, W., Lu, S., Lu, X.-R., Ma, B.-Q., Maiheu, B., Makins, N. C. R., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Mexner, V., Miller, C. A., Miyachi, Y., Muccifora, V., Murray, M., Mussgiller, A., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W.-D., Osborne, A., Pappalardo, L. L., Perez-Benito, R., Pickert, N., Raithel, M., Reggiani, D., Reimer, P. E., Reischl, A., Reolon, A. R., Riedl, C., Rith, K., Rock, S. E., Rosner, G., Rostomyan, A., Rubacek, L., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanjiev, I., Schäfer, A., Schnell, G., Schüler, K. P., Seitz, B., Shearer, C., Shibata, T.-A., Shutov, V., Stancari, M., Statera, M., Steffens, J. E., Steijger, J. J. M., Stenzel, H., Stewart, J., Stinzing, F., Streit, J., Tait, P., Taroian, S., Tchuiko, B., Terkulov, A., Trzcinski, A., Tytgat, M., Vandenbroucke, A., van der Nat, P. B., van der Steenhoven, G., Van Haarlem, Y., Van Hulse, C., Varanda, M., Veretennikov, D., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Ye, H., Ye, Y., Ye, Z., Yen, S., Yu, W., Zeiler, D., Zihlmann, B., Zupranski, P., and The HERMES Collaboration

Published
2009
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15. 3He(e,e′pp) and 3He(e,e′pn) reactions at AmPS and MAMI

Author

Middleton, D. G., Annand, J. R. M., Ases Antelo, M., 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., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H. A., Jans, E., 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., Pérez Benito, R., Pospischil, Th., Potokar, M., Rosner, G., Seimitz, M., de Vries, H., Walcher, Th., Watts, D. P., Weinriefer, M., Weiss, M., and Zihlmann, B.

Published
2008
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16. First measurements of the 16O(e, e'pn)14N reaction

Author

Middleton, D. G., Annand, J. R. M., Barbieri, C., Barneo, P., Blok, H. P., Böhm, R., Distler, M. O., Friedrich, J., Giusti, C., Glazier, D. I., Grabmayr, P., Hehl, T., Heim, J., Hesselink, W. H. A., Jans, E., Kohl, M., Lapikás, L., MacGregor, I. J. D., Martin, I., McGeorge, J. C., Merkel, H., Moschini, F., Rosner, G., Seimetz, M., de Vries, H., Walcher, Th., Watts, D. P., and Zihlmann, B.

Published
2006
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18. Deuteron Electrodisintegration at High Missing Momenta

Author

Kasdorp, W.-J., Hesselink, W. H. A., Groep, D., Jans, E., Kalantar-Nayestanaki, N., Lapikás, L., van Leeuwe, J. J., Misiejuk, A., Nooren, G. J. L., Onderwater, C. J. G., Pellegrino, A. R., Spaltro, C. M., Starink, R., van der Steenhoven, G., Steijger, J. J. M., and Templon, J. A.

Published
1998
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20. Electron-induced two-proton knockout from 3He

Author

Groep, D. L., primary, van Batenburg, M. F., additional, Bauer, Th. S., additional, Blok, H. P., additional, Boersma, D. J., additional, Cisbani, E., additional, Leo, R. De, additional, Frullani, S., additional, Garibaldi, F., additional, Glöckle, W., additional, Golak, J., additional, Heimberg, P., additional, Hesselink, W. H. A., additional, Iodice, M., additional, Ireland, D., additional, Jans, E., additional, Kamada, H., additional, Lapikás, L., additional, Lolos, G., additional, Perrino, R., additional, Scott, A., additional, Starink, R., additional, Steenbakkers, M. F. M., additional, Urciuoli, G. M., additional, de Vries, H., additional, Weinstein, L. B., additional, and Witala, H., additional

Published
1999
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21. High Missing-Momentum Components in 4He Studied with the (e, e′p) Reaction

Author

van Leeuwe, J. J., primary, Blok, H. P., additional, van den Brand, J. F. J., additional, Bulten, H. J., additional, Dodge, G. E., additional, Ent, R., additional, Hesselink, W. H. A., additional, Jans, E., additional, Kasdorp, W.-J., additional, Laget, J. M., additional, Lapikás, L., additional, Onderwater, C. J. G., additional, Pellegrino, A., additional, Spaltro, C. M., additional, Steijger, J. J. M., additional, Templon, J. A., additional, and Unal, O., additional

Published
1995
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22. Investigation of the Exclusive 3He(e, e’pn) 1H Reaction

Author

Kepler Centre for Astro and Particle Physics, Physikalisches Institut, Universität Tübingen, D-72076 Tübingen, Germany, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, Scotland, Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany, Nikhef, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands, Nikhef, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands, Department of Physics, VU-university, Amsterdam, The Netherlands, Department of Physics, University of Zagreb, Zagreb, Croatia, M. Smoluchowski Institute of Physics, Jagiellonian University, PL-30059 Kraków, Poland, Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44780 Bochum, Germany, Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan, Institute for Advanced Simulation, Institut für Kernphysik, and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany, Institute Jožef Stefan, University of Ljubljana, Ljubljana, Slovenia, 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., Zihlmann, B., Kepler Centre for Astro and Particle Physics, Physikalisches Institut, Universität Tübingen, D-72076 Tübingen, Germany, Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, Scotland, Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany, Nikhef, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands, Nikhef, P.O. Box 41882, 1009 DB Amsterdam, The Netherlands, Department of Physics, VU-university, Amsterdam, The Netherlands, Department of Physics, University of Zagreb, Zagreb, Croatia, M. Smoluchowski Institute of Physics, Jagiellonian University, PL-30059 Kraków, Poland, Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44780 Bochum, Germany, Department of Physics, Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan, Institute for Advanced Simulation, Institut für Kernphysik, and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany, Institute Jožef Stefan, University of Ljubljana, Ljubljana, Slovenia, 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.

Abstract

type:Journal Article, 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
2017

25. Spin density matrix elements in exclusive rho (0) electroproduction on H-1 and H-2 targets at 27.5 GeV beam energy

Author

Airapetian, A., Akopov, N., Akopov, Z., Andrus, A., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetissian, E., Belostotski, S., Bianchi, N., Blok, H. P., Böttcher, H., Bonomo, C., Borissov, A., Brüll, A., Bryzgalov, V., Capiluppi, M., Capitani, G. P., Cisbani, E., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., Demey, M., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Dreschler, J., Düren, M., Ehrenfried, M., Elalaoui-Moulay, A., Elbakian, G., Ellinghaus, F., Elschenbroich, U., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Funel, A., Gabbert, D., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Grebeniouk, O., Gregor, I. M., Guler, H., Hadjidakis, C., Hartig, M., Hasch, D., Hasegawa, T., Hesselink, W. H. A., Hill, G., Hillenbrand, A., Hoek, M., Holler, Y., Hommez, B., Hristova, I., Iarygin, G., Imazu, Y., Ivanilov, A., Izotov, A., Jackson, H. E., Jgoun, A., Kaiser, R., Keri, T., Kinney, E., Kisselev, A., Kobayashi, T., Kopytin, M., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Lagamba, L., Lamb, R., Lapikás, L., Lehmann, I., Lenisa, P., Liebing, P., Linden-Levy, L. A., Lorenzon, W., Lu, S., Lu, X.-R., Ma, B.-Q., Maiheu, B., Makins, N. C. R., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Mexner, V., Miller, C. A., Miyachi, Y., Muccifora, V., Murray, M., Mussgiller, A., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W.-D., Osborne, A., Pappalardo, L. L., Perez-Benito, R., Pickert, N., Raithel, M., Reggiani, D., Reimer, P. E., Reischl, A., Reolon, A. R., Riedl, C., Rith, K., Rock, S. E., Rosner, G., Rostomyan, A., Rubacek, L., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanjiev, I., Schäfer, A., Schnell, G., Schüler, K. P., Seitz, B., Shearer, C., Shibata, T.-A., Shutov, V., Stancari, M., Statera, M., Steffens, J. E., Steijger, J. J. M., Stenzel, H., Stewart, J., Stinzing, F., Streit, J., Tait, P., Taroian, S., Tchuiko, B., Terkulov, A., Trzcinski, A., Tytgat, M., Vandenbroucke, A., van der Nat, P. B., van der Steenhoven, G., Van Haarlem, Y., Van Hulse, C., Varanda, M., Veretennikov, D., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Yaschenko, S., Ye, H., Ye, Y., Ye, Z., Yen, S., Yu, W., Zeiler, D., Zihlmann, B., Zupranski, P., (Astro)-Particles Physics, Photo Conversion Materials, Network Institute, Student Lab and Education, and Artificial Intelligence (section level)

Subjects
HERMES experiment, Particle physics, Hydrogen, Physics and Astronomy (miscellaneous), FOS: Physical sciences, chemistry.chemical_element, Kinematics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, SDG 14 - Life Below Water, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Physics, 010308 nuclear & particles physics, Polarization (waves), Helicity, Amplitude, Deuterium, chemistry, High Energy Physics::Experiment, Condensed Matter::Strongly Correlated Electrons, Beam energy
Abstract

Spin Density Matrix Elements (SDMEs) describing the angular distribution of exclusive rho^0 electroproduction and decay are determined in the HERMES experiment with 27.6 GeV beam energy and unpolarized hydrogen and deuterium targets. Eight (fifteen) SDMEs that are related (unrelated) to the longitudinal polarization of the beam are extracted in the kinematic region 1 GeV^2 < Q^2 < 7 GeV^2, 3.0 GeV < W < 6.3 GeV, and -t < 0.4 GeV^2. Within the given experimental uncertainties, a hierarchy of relative sizes of helicity amplitudes is observed. Kinematic dependences of all SDMEs on Q^2 and t are presented, as well as the longitudinal-to-transverse rho^0 electroproduction cross section ratio as a function of Q^2. A small but statistically significant deviation from the hypothesis of s-channel helicity conservation is observed. An indication is seen of a contribution of unnatural-parity-exchange amplitudes; these amplitudes are naturally generated with a quark-exchange mechanism., 41 pages, 20 figures, 16 table; revised version corrects small typos, text clarified on 6 pages, two references added and new data added to figure 20

Published
2009

28. 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

29. Spin density matrix elements in exclusive $\mathrm{\rho^0}$ electroproduction on $\mathrm{^1H}$ and $\mathrm{^2H}$ targets at 27.5 GeV beam energy

Author

Airapetian, A., Akopov, N., Bianchi, N., Muccifora, V., Murray, M., Mussgiller, A., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W.-D., Osborne, A., Blok, H. P., Pappalardo, L. L., Perez-Benito, R., Pickert, N., Raithel, M., Reggiani, D., Reimer, P. E., Reischl, A., Reolon, A. R., Riedl, C., Rith, K., Böttcher, H., Rock, S. E., Rosner, G., Rostomyan, A., Rubacek, L., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanjiev, I., Schäfer, A., Schnell, G., Bonomo, C., Schüler, K. P., Seitz, B., Shearer, C., Shibata, T.-A., Shutov, V., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stenzel, H., Borissov, A., Stewart, J., Stinzing, F., Streit, J., Tait, P., Taroian, S., Tchuiko, B., Terkulov, A., Trzcinski, A., Tytgat, M., Vandenbroucke, A., Brüll, A., van der Nat, P. B., van der Steenhoven, G., Van Haarlem, Y., Van Hulse, C., Varanda, M., Veretennikov, D., Vikhrov, V., Vilardi, I., Vogel, C., Wang, S., Bryzgalov, V., Yaschenko, S., Ye, H., Ye, Y., Ye, Z., Yen, S., Yu, W., Zeiler, D., Zihlmann, B., Zupranski, P., HERMES Collaboration, Capiluppi, M., Capitani, G. P., Cisbani, E., Akopov, Z., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., Demey, M., De Nardo, L., De Sanctis, E., Diefenthaler, M., Di Nezza, P., Andrus, A., Dreschler, J., Düren, M., Ehrenfried, M., Elalaoui-Moulay, A., Elbakian, G., Ellinghaus, F., Elschenbroich, U., Fabbri, R., Fantoni, A., Felawka, L., Aschenauer, E. C., Frullani, S., Funel, A., Gabbert, D., Gapienko, G., Gapienko, V., Garibaldi, F., Gavrilov, G., Gharibyan, V., Giordano, F., Gliske, S., Augustyniak, W., Grebeniouk, O., Gregor, I. M., Guler, H., Hadjidakis, C., Hartig, M., Hasch, D., Hasegawa, T., Hesselink, W. H. A., Hill, G., Hillenbrand, A., Avakian, R., Hoek, M., Holler, Y., Hommez, B., Hristova, I., Iarygin, G., Imazu, Y., Ivanilov, A., Izotov, A., Jackson, H. E., Jgoun, A., Avetissian, A., Kaiser, R., Keri, T., Kinney, E., Kisselev, A., Kobayashi, T., Kopytin, M., Korotkov, V., Kozlov, V., Kravchenko, P., Krivokhijine, V. G., Avetisyan, E., Lagamba, L., Lamb, R., Lapikás, L., Lehmann, I., Lenisa, P., Liebing, P., Linden-Levy, L. A., Lorenzon, W., Lu, S., Lu, X.-R., Belostotski, S., Ma, B.-Q., Maiheu, B., Makins, N. C. R., Manaenkov, S. I., Mao, Y., Marianski, B., Marukyan, H., Mexner, V., Miller, C. A., and Miyachi, Y.

Subjects
ddc:530
Published
2009

30. 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

31. O-16(e,e ' p) reaction at large missing energy

Author

Iodice, M., Cisbani, E., De Leo, R., Frullani, S., Garibaldi, F., Groep, D. L., Hesselink, W. H. A., Jans, E., Lapikas, L., Onderwater, C. J. G., Perrino, R., Ryckebusch, J., Starink, R., Urciuoli, G. M., and Precision Frontier

Subjects
ELECTRON-SCATTERING, two-body currents, electron-induced knockout reactions, Nuclear Theory, FACILITY, SHORT-RANGE CORRELATIONS, O-16, Nuclear Experiment
Abstract

We investigate the origin of the strength at large missing energies in electron-induced proton knockout reactions. For that purpose the reaction 160(e. e'p) was studied at a central value w) = 215 MeV of the energy transfer, and two values of the momentum transfer: q = 300, 400 MeV/c, corresponding to the "dip region". Differential cross sections were determined in a large range of missing energy (E-m = 0-140 MeV) and proton emission angle (gamma(pq),, = 0- 110 degrees), and compared to predictions of a model that includes nucleon-nucleon short-range correlations and two-body currents. It is observed that, in the kinematic domain covered by this experiment, the largest contribution to the cross section stems from two-body currents, while short-range correlations contribute a significant fraction. (C) 2007 Elsevier B.V. All rights reserved.

Published
2007

32. Transverse Polarization of Lambda and Lambda-bar Hyperons in Quasi-Real Photon-Nucleon Scattering at HERMES

Author

Airapetian, A., Akopov, N., Avetissian, E., Mikloukho, O., Miller, C. A., Miyachi, Y., Muccifora, V., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Nowak, W.-D., Oganessyan, K., Bailey, P., Ohsuga, H., Orlandi, G., Potashov, S., Potterveld, D. H., Raithel, M., Reggiani, D., Reimer, P. E., Reischl, A., Reolon, A. R., Rith, K., Baturin, V., Rosner, G., Rostomyan, A., Ryckbosch, D., Sanjiev, I., Savin, I., Scarlett, C., Schafer, A., Schill, C., Schnell, G., Schuler, K. P., Baumgarten, C., Schwind, A., Seibert, J., Seitz, B., Shanidze, R., Shibata, T.-A., Shutov, V., Simani, M. C., Sinram, K., Stancari, M., Statera, M., Beckmann, M., Steffens, E., Steijger, J. J. M., Stewart, J., Stosslein, U., Tanaka, H., Taroian, S., Tchuiko, B., Terkulov, A., Tessarin, S., Thomas, E., Belostotski, S., Tkabladze, A., Trzcinski, A., Tytgat, M., Urciuoli, G. M., van der Nat, P. B., van der Steenhoven, G., van de Vyver, R., Veretennikov, D., Vetterli, M. C., Vikhrov, V., Bernreuther, S., Vincter, M. G., Visser, J., Vogt, M., Volmer, J., Weiskopf, C., Wendland, J., Wilbert, J., Wise, T., Yen, S., Yoneyama, S., Bianchi, N., Zihlmann, B., Zohrabian, H., Zupranski, P., HERMES Collaboration, Blok, H. P., Bottcher, H., Akopov, Z., Borissov, A., Bouwhuis, M., Brack, J., Brull, A., Brunn, I., Capitani, G. P., Chiang, H. C., Ciullo, G., Contalbrigo, M., Court, G. R., Amarian, M., Dalpiaz, P. F., De Leo, R., De Nardo, L., De Sanctis, E., Devitsin, E., Di Nezza, P., Duren, M., Ehrenfried, M., Elalaoui-Moulay, A., Elbakian, G., Ammosov, V. V., Ellinghaus, F., Elschenbroich, U., Ely, J., Fabbri, R., Fantoni, A., Fechtchenko, A., Felawka, L., Fox, B., Franz, J., Frullani, S., Andrus, A., Garber, Y., Gapienko, G., Gapienko, V., Garibaldi, F., Garutti, E., Gaskell, D., Gavrilov, G., Gharibyan, V., Graw, G., Grebeniouk, O., Aschenauer, E. C., Greeniaus, L. G., Haeberli, W., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Henoch, M., Hertenberger, R., Hesselink, W. H. A., Hillenbrand, A., Augustyniak, W., Holler, Y., Hommez, B., Iarygin, G., Izotov, A., Jackson, H. E., Jgoun, A., Kaiser, R., Kinney, E., Kisselev, A., Konigsmann, K., Avakian, R., Kolster, H., Kopytin, M., Korotkov, V., Kozlov, V., Krauss, B., Krivokhijine, V. G., Lagamba, L., Lapikas, L., Laziev, A., Lenisa, P., Avetissian, A., Liebing, P., Lindemann, T., Lipka, K., Lorenzon, W., Makins, N. C. R., Marukyan, H., Masoli, F., Menden, F., Mexner, V., and Meyners, N.

Subjects
+Lambda+positron+anything%22">positron nucleon --> Lambda positron anything, longitudinal [polarized target], transverse [polarization], momentum dependence, HERMES, transverse momentum dependence, deep inelastic scattering [positron nucleon], polarized target: longitudinal, polarization: transverse, ddc:530, Nuclear Experiment, Antilambda: polarization, longitudinal [polarized beam], photoproduction [Lambda], 27.6 GeV, High Energy Physics::Phenomenology, Lambda: polarization, Lambda: photoproduction, DESY HERA Stor, positron nucleon: deep inelastic scattering, polarized beam: longitudinal, High Energy Physics::Experiment, polarization [Antilambda], polarization [Lambda], experimental results
Abstract

Physical review / D 76(9), 092008 (2007). doi:10.1103/PhysRevD.76.092008, The HERMES experiment has measured the transverse polarization of Lambda and Lambda-bar hyperons produced inclusively in quasireal photoproduction at a positron beam energy of 27.6 GeV. The transverse polarization of the Lambda hyperon is found to be positive while the observed Lambda-bar polarization is compatible with zero. The transverse polarization values averaged over the kinematic acceptance of HERMES are 0.078 +/- 0.006(stat) +/- 0.012(syst) and -0.025 +/- 0.015(stat) +/- 0.018(syst) for Lambda and Lambda-bar hyperons, respectively. The dependences of Lambda and Lambda-bar polarizations on the fraction $\zeta$ of the beam's light-cone momentum carried by the hyperon and on the hyperon's transverse momentum $p_T$ were investigated. The measured Lambda polarization rises linearly with $p_T$ and exhibits a different behavior for low and high values of $\zeta$, which approximately correspond to the backward and forward regions in the center-of-mass frame of the $\gamma^*N$ reaction., Published by Soc., [S.l.]

Published
2007

33. Shape Coexistence in Neutron-Deficient Pb Isotopes

Author

Penninga, J., primary, Hesselink, W. H. A., additional, Stolk, A., additional, Verheul, H., additional, Ho, J. K., additional, van Klinken, J., additional, Riezenbos, H. J., additional, de Voigt, M. J. A., additional, and Zemel, A., additional

Published
1986
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35. Search for an exotic S = -2, Q = -2 baryon resonance at a mass near 1862-MeV in quasi-real photoproduction

Author

Airapetian, A., Akopov, N., Bailey, P., Meyners, N., Michler, T., Mikloukho, O., Miller, C. A., Miyachi, Y., Muccifora, V., Murray, M., Nagaitsev, A., Nappi, E., Naryshkin, Y., Balin, D., Negodaev, M., Nowak, W.-D., Oganessyan, K., Ohsuga, H., Osborne, A., Pickert, N., Potterveld, D. H., Raithel, M., Reggiani, D., Reimer, P. E., Beckmann, M., Reischl, A., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubacek, L., Rubin, J., Ryckbosch, D., Salomatin, Y., Belostotski, S., Sanjiev, I., Savin, I., Schafer, A., Schnell, G., Schuler, K. P., Seele, J., Seidl, R., Seitz, B., Shearer, C., Shibata, T.-A., Bianchi, N., Shutov, V., Sinram, K., Sommer, W., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stenzel, H., Stewart, J., Stinzing, F., Blok, H. P., Tait, P., Tanaka, H., Taroian, S., Tchuiko, B., Terkulov, A., Trzcinski, A., Tytgat, M., Vandenbroucke, A., van der Nat, P. B., van der Steenhoven, G., Bottcher, H., van Haarlem, Y., Vikhrov, V., Vincter, M. G., Vogel, C., Volmer, J., Wang, S., Wendland, J., Ye, Y., Ye, Z., Yen, S., Borissov, A., Zihlmann, B., Zupranski, P., HERMES Collaboration, Borysenko, A., Bouwhuis, M., Akopov, Z., Brull, A., Bryzgalov, V., Capiluppi, M., Capitani, G. P., Chen, T., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Deconinck, W., De Leo, R., Amarian, M., Demey, M., De Nardo, L., De Sanctis, E., Devitsin, E., Diefenthaler, M., Di Nezza, P., Drechsler, J., Duren, M., Ehrenfried, M., Elalaoui-Moulay, A., Andrus, A., Elbakian, G., Ellinghaus, F., Elschenbroich, U., Fabbri, R., Fantoni, A., Felawka, L., Frullani, S., Funel, A., Gapienko, G., Gapienko, V., Aschenauer, E. C., Garibaldi, F., Garrow, K., Gavrilov, G., Gharibyan, V., Giordano, F., Grebeniouk, O., Gregor, I. M., Hadjidakis, C., Hafidi, K., Hartig, M., Augustyniak, W., Hasch, D., Hesselink, W. H. A., Hillenbrand, A., Hoek, M., Holler, Y., Hommez, B., Hristova, I., Iarygin, G., Ivanilov, A., Izotov, A., Avakian, R., Jackson, H. E., Jgoun, A., Kaiser, R., Keri, T., Kinney, E., Kisselev, A., Kobayashi, T., Kopytin, M., Korotkov, V., Kozlov, V., Avetissian, A., Krauss, B., Krivokhijine, V. G., Lagamba, L., Lapikas, L., Laziev, A., Lenisa, P., Liebing, P., Linden-Levy, L. A., Lorenzon, W., Lu, H., Avetissian, E., Lu, J., Lu, S., Ma, B.-Q., Maiheu, B., Makins, N. C. R., Mao, Y., Marianski, B., Marukyan, H., Masoli, F., and Mexner, V.

Subjects
inclusive reaction [positron deuteron], (p 3pi-) [mass spectrum], branching ratio [channel cross section], DESY HERA Stor, 27.5 GeV, search for [pentaquark], ddc:530, exotic [baryon resonance], hadroproduction [Xi(1530)], (p pi+ 2pi-) [mass spectrum], Xi(1862) [postulated particle], upper limit
Abstract

A search for an exotic baryon resonance with $S=-2, Q=-2$ has been performed in quasi-real photoproduction on a deuterium target through the decay channel $\Xi^- \pi^- \to \Lambda \pi^- \pi^- \to p \pi^- \pi^- \pi^-$. No evidence for a previously reported $\Xi^{--}(1860)$ resonance is found in the $\Xi^- \pi^-$invariant mass spectrum. An upper limit for the photoproduction cross section of 2.1 nb is found at the 90% confidence level. The photoproduction cross section for the $\Xi^{0}(1530)$ is found to be between 9 and 24 nb.

Published
2005

36. First measurement of the tensor structure function $b_1$ of the deuteron

Author

Airapetian, A., Akopov, N., Avetissian, E., Makins, N. C. R., Mao, Y., Marianski, B., Marukyan, H., Masoli, F., Mexner, V., Meyners, N., Mikloukho, O., Miller, C. A., Miyachi, Y., Bailey, P., Muccifora, V., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W.-D., Oganessyan, K., Ohsuga, H., Pickert, N., Balin, D., Potashov, S., Potterveld, D. H., Raithel, M., Reggiani, D., Reimer, P. E., Reischl, A., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Baturin, V., Rostomyan, A., Rubacek, L., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanjiev, I., Savin, I., Schafer, A., Schill, C., Schnell, G., Beckmann, M., Schuler, K. P., Seele, J., Seidl, R., Seitz, B., Shanidze, R., Shearer, C., Shibata, T.-A., Shutov, V., Simani, M. C., Sinram, K., Belostotski, S., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stenzel, H., Stewart, J., Stinzing, F., Stosslein, U., Tait, P., Tanaka, H., Bernreuther, S., Taroian, S., Tchuiko, B., Terkulov, A., Tkabladze, A., Trzcinski, A., Tytgat, M., Vandenbroucke, A., van der Nat, P. B., van der Steenhoven, G., Vetterli, M. C., Bianchi, N., Vikhrov, V., Vincter, M. G., Vogel, C., Vogt, M., Volmer, J., Weiskopf, C., Wendland, J., Wilbert, J., Ye, Y., Ye, Z., Blok, H. P., Yen, S., Zihlmann, B., Zupranski, P., HERMES Collaboration, Bottcher, H., Akopov, Z., Borissov, A., Borysenko, A., Bouwhuis, M., Brack, J., Brull, A., Bryzgalov, V., Capitani, G. P., Chen, T., Chiang, H. C., Ciullo, G., Amarian, M., Contalbrigo, M., Dalpiaz, P. F., Leo, R. De, Demey, M., Nardo, L. De, Sanctis, E. De, Devitsin, E., Nezza, P. Di, Dreschler, J., Duren, M., Ammosov, V. V., Ehrenfried, M., Elalaoui-Moulay, A., Elbakian, G., Ellinghaus, F., Elschenbroich, U., Fabbri, R., Fantoni, A., Fechtchenko, A., Felawka, L., Fox, B., Andrus, A., Frullani, S., Gapienko, G., Gapienko, V., Garibaldi, F., Garrow, K., Garutti, E., Gaskell, D., Gavrilov, G., Gharibyan, V., Graw, G., Aschenauer, E. C., Grebeniouk, O., Greeniaus, L. G., Gregor, I. M., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Henoch, M., Hertenberger, R., Hesselink, W. H. A., Augustyniak, W., Hillenbrand, A., Hoek, M., Holler, Y., Hommez, B., Iarygin, G., Ivanilov, A., Izotov, A., Jackson, H. E., Jgoun, A., Kaiser, R., Avakian, R., Kinney, E., Kisselev, A., Kopytin, M., Korotkov, V., Kozlov, V., Krauss, B., Krivokhijine, V. G., Lagamba, L., Lapikas, L., Laziev, A., Avetissian, A., Lenisa, P., Liebing, P., Linden-Levy, L. A., Lipka, K., Lorenzon, W., Lu, H., Lu, J., Lu, S., Ma, B.-Q., and Maiheu, B.

Subjects
DESY HERA Stor, 27.6 GeV/c, structure function [deuteron], deep inelastic scattering [positron deuteron], asymmetry [polarization], ddc:550, tensor [polarization], HERMES, moment [structure function], polarized target [deuteron], momentum transfer dependence, x-dependence, experimental results
Published
2005

37. Quark helicity distributions in the nucleon for up, down, and strange quarks from semi-inclusive deep-inelastic scattering

Author

Airapetian, A., Akopov, N., Avetissian, E., Marianski, B., Marukyan, H., Masoli, F., Mexner, V., Meyners, N., Mikloukho, O., Miller, C. A., Miyachi, Y., Muccifora, V., Nagaitsev, A., Bailey, P., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W. D., Oganessyan, K., Ohsuga, H., Pickert, N., Potashov, S., Potterveld, D. H., Baturin, V., Raithel, M., Reggiani, D., Reimer, P. E., Reischl, A., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubacek, L., Baumgarten, C., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanjiev, I., Savin, I., Scarlett, C., Schafer, A., Schill, C., Schnell, G., Schuler, K. P., Beckmann, M., Schwind, A., Seele, J., Seidl, R., Seitz, B., Shanidze, R., Shearer, C., Shibata, T. A., Shutov, V., Simani, M. C., Sinram, K., Belostotski, S., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stenzel, H., Stewart, J., Stosslein, U., Tait, P., Tanaka, H., Taroian, S., Bernreuther, S., Tchuiko, B., Terkulov, A., Tkabladze, A., Trzcinski, A., Tytgat, M., Vandenbroucke, A., van der Nat, P., van der Steenhoven, G., Vetterli, M. C., Vikhrov, V., Bianchi, N., Vincter, M. G., Vogel, C., Vogt, M., Volmer, J., Weiskopf, C., Wendland, J., Wilbert, J., Ybeles Smit, G., Yen, S., Zihlmann, B., Blok, H. P., Zohrabian, H., Zupranski, P., HERMES Collaboration, Blumlein, J., Akopov, Z., Bottcher, H., Borissov, A., Borysenko, A., Bouwhuis, M., Brack, J., Brull, A., Bryzgalov, V., Capitani, G. P., Chiang, H. C., Ciullo, G., Amarian, M., Contalbrigo, M., Dalpiaz, P. F., De Leo, R., De Nardo, L., De Sanctis, E., Devitsin, E., Di Nezza, P., Duren, M., Ehrenfried, M., Elalaoui-Moulay, A., Ammosov, V. V., Elbakian, G., Ellinghaus, F., Elschenbroich, U., Ely, J., Fabbri, R., Fantoni, A., Fechtchenko, A., Felawka, L., Fox, B., Franz, J., Andrus, A., Frullani, S., Gapienko, G., Gapienko, V., Garibaldi, F., Garrow, K., Garutti, E., Gaskell, D., Gavrilov, G., Gharibyan, V., Graw, G., Aschenauer, E. C., Grebeniouk, O., Greeniaus, L. G., Gregor, I. M., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Henoch, M., Hertenberger, R., Hesselink, W. H. A., Augustyniak, W., Hillenbrand, A., Hoek, M., Holler, Y., Hommez, B., Iarygin, G., Ivanilov, A., Izotov, A., Jackson, H. E., Jgoun, A., Kaiser, R., Avakian, R., Kinney, E., Kisselev, A., Konigsmann, K., Kopytin, M., Korotkov, V., Kozlov, V., Krauss, B., Krivokhijine, V. G., Lagamba, L., Lapikas, Louk, Avetissian, A., Laziev, A., Lenisa, P., Liebing, P., Lindemann, T., Linden-Levy, L. A., Lipka, K., Lorenzon, W., Lu, J., Maiheu, B., Makins, N. C. R., (Astro)-Particles Physics, Photo Conversion Materials, and Student Lab and Education

Subjects
Quark, internal [polarized target], Nuclear and High Energy Physics, Particle physics, Strange quark, sea [quark], High Energy Physics::Lattice, deep inelastic scattering [positron deuteron], Hadron, Nuclear Theory, dependence [flavor], Down quark, FOS: Physical sciences, HERMES, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), density [helicity], 27.5 GeV, Pion, 0103 physical sciences, ddc:530, SDG 14 - Life Below Water, deep inelastic scattering [positron p], 010306 general physics, electroproduction [pi], Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, polarization [quark], Deep inelastic scattering, moment, Baryon, DESY HERA Stor, electroproduction [K], Up quark, valence [quark], polarization [cross section], High Energy Physics::Experiment, polarized beam [positron], asymmetry [spin], experimental results
Abstract

Polarized deep-inelastic scattering data on longitudinally polarized hydrogen and deuterium targets have been used to determine double-spin asymmetries of cross sections. Inclusive and semi-inclusive asymmetries for the production of positive and negative pions from hydrogen were obtained in a reanalysis of previously published data. Inclusive and semi-inclusive asymmetries for the production of negative and positive pions and kaons were measured on a polarized deuterium target. The separate helicity densities for the up and down quarks and the anti-up, anti-down, and strange sea quarks were computed from these asymmetries in a "leading order" QCD analysis. The polarization of the up-quark is positive and that of the down-quark is negative. All extracted sea quark polarizations are consistent with zero, and the light quark sea helicity densities are flavor symmetric within the experimental uncertainties. First and second moments of the extracted quark helicity densities in the measured range are consistent with fits of inclusive data. © 2005 The American Physical Society.

Published
2005

38. Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target

Author

Airapetian, A., Akopov, N., Bacchetta, A., Mikloukho, O., Miller, C. A., Miyachi, Y., Muccifora, V., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W. D., Bailey, P., Oganessyan, K., Ohsuga, H., Osborne, A., Pickert, N., Potterveld, D. H., Raithel, M., Reggiani, D., Reimer, P. E., Reischl, A., Reolon, A. R., Balin, D., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubacek, L., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanjiev, I., Savin, Igor A., Beckmann, M., Schafer, A., Schill, C., Schnell, G., Schuler, K. P., Seele, J., Seidl, R., Seitz, B., Shanidze, R., Shearer, C., Shibata, T. A., Belostotski, S., Shutov, V., Sinram, K., Sommer, W., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stenzel, H., Stewart, J., Stinzing, F., Bianchi, N., Tait, P., Tanaka, H., Taroian, S., Tchuiko, B., Terkulov, A., Trzcinski, A., Tytgat, M., Vandenbroucke, A., van der Nat, P. B., van der Steenhoven, G., Blok, H. P., van Haarlem, Y., Vetterli, M. C., Vikhrov, V., Vincter, M. G., Vogel, C., Volmer, J., Wang, S., Wendland, J., Wilbert, J., Ybeles Smit, G., Bottcher, H., Ye, Y., Ye, Z., Yen, S., Zihlmann, B., Zupranski, P., HERMES Collaboration, Borissov, A., Borysenko, A., Akopov, Z., Bouwhuis, M., Brull, A., Bryzgalov, V., Capitani, G. P., Cappiluppi, M., Chen, T., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., De Leo, R., Amarian, M., Demey, M., De Nardo, L., De Sanctis, E., Devitsin, E., Di Nezza, P., Duren, M., Ehrenfried, M., Elalaoui-Moulay, A., Elbakian, G., Ellinghaus, F., Andrus, A., Elschenbroich, U., Fabbri, R., Fantoni, A., Fechtchenko, A., Felawka, L., Frullani, S., Gapienko, G., Gapienko, V., Garibaldi, F., Garrow, K., Aschenauer, E. C., Gavrilov, G., Gharibyan, V., Grebeniouk, O., Gregor, I. M., Hadjidakis, C., Hafidi, K., Hartig, M., Hasch, D., Henoch, M., Hesselink, W. H. A., Augustyniak, W., Hillenbrand, A., Hoek, M., Holler, Y., Hommez, B., Hristova, I., Iarygin, G., Ilyichev, A., Ivanilov, A., Izotov, A., Jackson, H. E., Avakian, R., Jgoun, A., Kaiser, R., Kinney, E., Kisselev, A., Kobayashi, T., Kopytin, M., Korotkov, V., Kozlov, V., Krauss, B., Krivokhijine, V. G., Avetissian, A., Lagamba, L., Lapikas, Louk, Laziev, A., Lenisa, P., Liebing, P., Linden-Levy, L. A., Lorenzon, W., Lu, H., Lu, J., Lu, S., Avetissian, E., Ma, B. Q., Maiheu, B., Makins, N. C. R., Mao, Y., Marianski, B., Marukyan, H., Masoli, F., Mexner, V., Meyners, N., Michler, T., (Astro)-Particles Physics, Photo Conversion Materials, and Student Lab and Education

Subjects
Particle physics, transverse [polarization], Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, HERMES, 13.60.–r, Inelastic scattering, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 27.5 GeV, Pion, 13.88.+e, ddc:550, Vector meson, SDG 14 - Life Below Water, deep inelastic scattering [positron p], 14.20.Dh, 14.65.–q, Nuclear Experiment, Physics, Scattering, polarized target [hydrogen], High Energy Physics::Phenomenology, polarization [quark], Deep inelastic scattering, +pi+positron+anything%22">positron p --> pi positron anything, angular dependence, DESY HERA Stor, Distribution function, High Energy Physics::Experiment, transverse momentum [quark], Nucleon, electroproduction [pi+], asymmetry [spin], electroproduction [pi-], Lepton, experimental results
Abstract

Single-spin asymmetries for semi-inclusive electroproduction of charged pions in deep-inelastic scattering of positrons are measured for the first time with transverse target polarization. The asymmetry depends on the azimuthal angles of both the pion ($\ensuremath{\phi}$) and the target spin axis (${\ensuremath{\phi}}_{S}$) about the virtual-photon direction and relative to the lepton scattering plane. The extracted Fourier component $\mathbf{⟨}\mathrm{sin} (\ensuremath{\phi}+{\ensuremath{\phi}}_{S}){\mathbf{⟩}}_{UT}^{\ensuremath{\pi}}$ is a signal of the previously unmeasured quark transversity distribution, in conjunction with the Collins fragmentation function, also unknown. The component $\mathbf{⟨}\mathrm{sin} (\ensuremath{\phi}\ensuremath{-}{\ensuremath{\phi}}_{S}{\mathbf{⟩}}_{UT}^{\ensuremath{\pi}}$ arises from a correlation between the transverse polarization of the target nucleon and the intrinsic transverse momentum of quarks, as represented by the previously unmeasured Sivers distribution function. Evidence for both signals is observed, but the Sivers asymmetry may be affected by exclusive vector meson production.

Published
2005

39. Flavor decomposition of the sea quark helicity distributions in the nucleon from semiinclusive deep inelastic scattering

Author

Airapetian, A., Akopov, N., Avetissian, E., Mexner, V., Meyners, N., Mikloukho, O., Miller, C. A., Miyachi, Y., Muccifora, V., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Bailey, P., Negodaev, M., Nowak, W.-D., Oganessyan, K., Ohsuga, H., Orlandi, G., Pickert, N., Potashov, S., Potterveld, D. H., Raithel, M., Reggiani, D., Baturin, V., Reimer, P. E., Reischl, A., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomyan, A., Rubacek, L., Ryckbosch, D., Salomatin, Y., Baumgarten, C., Sanjiev, I., Savin, I., Scarlett, C., Schafer, A., Schill, C., Schnell, G., Schuler, K. P., Schwind, A., Seele, J., Seidl, R., Beckmann, M., Seitz, B., Shanidze, R., Shearer, C., Shibata, T.-A., Shutov, V., Simani, M. C., Sinram, K., Stancari, M., Statera, M., Steffens, E., Belostotski, S., Steijger, J. J. M., Stewart, J., Stosslein, U., Tait, P., Tanaka, H., Taroian, S., Tchuiko, B., Terkulov, A., Tkabladze, A., Trzcinski, A., Bernreuther, S., Tytgat, M., Vandenbroucke, A., van der Nat, P., van der Steenhoven, G., Vetterli, M. C., Vikhrov, V., Vincter, M. G., Visser, J., Vogel, C., Vogt, M., Bianchi, N., Volmer, J., Weiskopf, C., Wendland, J., Wilbert, J., Ybeles Smit, G., Yen, S., Zihlmann, B., Zohrabian, H., Zupranski, P., HERMES Collaboration, Blok, H. P., Bottcher, H., Akopov, Z., Borissov, A., Bouwhuis, M., Brack, J., Brull, A., Bryzgalov, V., Capitani, G. P., Chiang, H. C., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Amarian, M., De Leo, R., De Nardo, L., De Sanctis, E., Devitsin, E., Di Nezza, P., Duren, M., Ehrenfried, M., Elalaoui-Moulay, A., Elbakian, G., Ellinghaus, F., Ammosov, V. V., Elschenbroich, U., Ely, J., Fabbri, R., Fantoni, A., Fechtchenko, A., Felawka, L., Fox, B., Franz, J., Frullani, S., Garber, Y., Andrus, A., Gapienko, G., Gapienko, V., Garibaldi, F., Garrow, K., Garutti, E., Gaskell, D., Gavrilov, G., Gharibyan, V., Graw, G., Grebeniouk, O., Aschenauer, E. C., Greeniaus, L. G., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Henoch, M., Hertenberger, R., Hesselink, W. H. A., Hillenbrand, A., Hoek, M., Augustyniak, W., Holler, Y., Hommez, B., Iarygin, G., Ivanilov, A., Izotov, A., Jackson, H. E., Jgoun, A., Kaiser, R., Kinney, E., Kisselev, A., Avakian, R., Konigsmann, K., Kopytin, M., Korotkov, V., Kozlov, V., Krauss, B., Krivokhijine, V. G., Lagamba, L., Lapikas, L., Laziev, A., Lenisa, P., Avetissian, A., Liebing, P., Lindemann, T., Lipka, K., Lorenzon, W., Lu, J., Maiheu, B., Makins, N. C. R., Marianski, B., Marukyan, H., and Masoli, F.

Subjects
sea [quark], momentum spectrum [quark], High Energy Physics::Lattice, deep inelastic scattering [positron deuteron], Nuclear Theory, HERMES, absorption [photon], x-dependence, inclusive reaction [positron deuteron], helicity [quark], ddc:550, Nuclear Experiment, 27.6 GeV, High Energy Physics::Phenomenology, DESY HERA Stor, electroproduction [K+], electroproduction [K-], flavor [quark], High Energy Physics::Experiment, asymmetry [flavor], polarized beam [positron], polarized target [deuteron], electroproduction [pi+], asymmetry [spin], electroproduction [pi-], experimental results
Abstract

Double-spin asymmetries of semi-inclusive cross sections for the production of identified pions and kaons have been measured in deep-inelastic scattering of polarized positrons on a polarized deuterium target. Five helicity distributions including those for three sea quark flavors were extracted from these data together with re-analyzed previous data for identified pions from a hydrogen target. These distributions are consistent with zero for all three sea flavors. A recently predicted flavor asymmetry in the polarization of the light quark sea appears to be disfavored by the data.

Published
2004

40. Nuclear polarization of molecular hydrogen recombined on a non-metallic surface

Author

Airapetian, A., Akopov, N., Avetissian, E., Makins, N. C. R., Marianski, B., Marukian, H., Masoli, F., Mexner, V., Meyners, N., Mikloukho, O., Miller, C. A., Miyachi, Y., Muccifora, V., Bailey, P., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaev, M., Nowak, W. D., Oganessyan, K., Ohsuga, H., Pickert, N., Potashov, S., Baturin, V., Potterveld, David H., Raithel, M., Reggiani, D., Reimer, P. E., Reischl, A., Reolon, A. R., Riedl, C., Rith, K., Rosner, G., Rostomian, A., Baumgarten, C., Rubacek, L., Rubin, J., Ryckbosch, D., Salomatin, Y., Sanjiev, I., Savin, Igor A., Scarlett, C., Schill, C., Schnell, G., Schuler, K. P., Beckmann, M., Schwind, A., Seele, J., Seidl, R., Seitz, B., Shanidze, R., Shearer, C., Shibata, T. A., Shutov, V., Simani, M. C., Sinram, K., Belostotsky, S., Stancari, M., Statera, M., Steffens, E., Steijger, J. J. M., Stenzel, H., Stewart, J., Stosslein, U., Tait, P., Tanaka, H., Taroian, S., Bernreuther, S., Chuiko, B., Terkulov, A., Tkabladze, A., Trzcinski, A., Tytgat, M., Vandenbroucke, A., van der Nat, P., van der Steenhoven, G., Vetterli, M. C., Vikhrov, V., Bianchi, N., Vincter, M. G., Vogel, C., Vogt, M., Volmer, J., Weiskopf, C., Wendland, J., Wilbert, J., Wise, T., Ybeles Smit, G., Zihlmann, B., Blok, H. P., Zohrabian, H., Zupranski, P., HERMES Collaboration, Bottcher, H., Akopov, Z., Borissov, A., Borisenko, A., Bouwhuis, M., Brack, J., Brull, A., Bryzgalov, V., Capitani, G. P., Chiang, H. C., Ciullo, G., Contalbrigo, M., Amarian, M., Court, G., Dalpiaz, P. F., De Leo, R., De Nardo, L., De Sanctis, E., Devitsin, E., Di Nezza, P., Duren, M., Ehrenfried, M., Elalaoui-Moulay, A., Ammosov, V. V., Elbakian, G., Ellinghaus, F., Elschenbroich, U., Ely, J., Fabbri, R., Fantoni, A., Feshchenko, A., Felawka, L., Fox, B., Franz, J., Andrus, A., Frullani, S., Gapienko, G., Gapienko, V., Garibaldi, F., Garrow, K., Garutti, E., Gaskell, D., Gavrilov, G., Gharibyan, V., Graw, G., Aschenauer, E. C., Grebenyuk, O., Greeniaus, L. G., Gregor, I. M., Haeberli, W., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Henoch, M., Hertenberger, R., Augustyniak, W., Hesselink, W. H. A., Hillenbrand, A., Hoek, M., Holler, Y., Hommez, B., Yarygin, G., Ivanilov, A., Izotov, A., Jackson, H. E., Jgoun, A., Avakian, R., Kaiser, R., Kinney, E., Kiselev, A., Kolster, H., Konigsmann, Kay, Kopytin, M., Korotkov, V., Kozlov, V., Krauss, B., Krivokhizhin, V. G., Avetissian, A., Lagamba, L., Lapikas, Louk, Laziev, A., Lenisa, P., Liebing, P., Linden-Levy, L. A., Lipka, K., Lorenzon, W., Lu, J., and Maiheu, B.

Subjects
fabrication [polarized target], DESY HERA Stor, 13.88.+e, molecule [hydrogen], polarized target [hydrogen], 39.10.+j, measurement [polarization], 34.09.+q, ddc:530, silicon [plastics], HERMES, surface [plastics], 29.25.P
Abstract

The nuclear polarization of ${\rm H}_2$ molecules formed by recombination of nuclear polarized H atoms on

Published
2004
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42. Double-spin asymmetries in the cross section of rho(0) and phi production at intermediate energies

Author

Airapetian, A., Akopov, N., Akopov, Z., Amarian, M., Ammosov, V. V., Andrus, A., Aschenauer, E. C., Augustyniak, W., Avakian, R., Avetissian, A., Avetissian, E., Bailey, P., Baturin, V., Baumgarten, C., Beckmann, M., Belostotski, S., Bernreuther, S., Bianchi, N., Blok, H. P., Bottcher, H., Borissov, A., Bouwhuis, M., Brack, J., Brull, A., Bryzgalov, V., Capitani, G. P., Chiang, H. C., Ciullo, Giuseppe, Contalbrigo, Marco, Court, G. R., Ferretti, Paola, De Leo, R., De Nardo, L., De Sanctis, E., Devitsin, E., Di Nezza, P., Duren, M., Ehrenfried, M., Elalaoui Moulay, A., Elbakian, G., Ellinghaus, F., Elschenbroich, U., Ely, J., Fabbri, Riccardo, Fantoni, A., Fechtchenko, A., Felawka, L., Fox, B., Franz, J., Frullani, S., Garber, Y., Gapienko, G., Gapienko, V., Garibaldi, F., Garutti, E., Gaskell, D., Gavrilov, G., Gharibyan, V., Graw, G., Grebeniouk, O., Greeniaus, L. G., Haeberli, W., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Henoch, M., Hertenberger, R., Hesselink, W. H. A., Hillenbrand, A., Holler, Y., Hommez, B., Iarygin, G., Ivanilov, A., Izotov, A., Jackson, H. E., Jgoun, A., Kaiser, R., Kinney, E., Kisselev, A., Konigsmann, Kay C., Kolster, H., Kopytin, M., Korotkov, V., Kozlov, V., Krauss, B., Krivokhijine, V. G., Lagamba, L., Lapikas, L., Laziev, A., Lenisa, Paolo, Liebing, P., Lindemann, T., Lipka, K., Lorenzon, W., Maiheu, B., Makins, N. C. R., Marianski, B., Marukyan, H., Masoli, Francesco Antonio, Menden, F., Mexner, V., Meyners, N., Mikloukho, O., Miller, C. A., Miyachi, Y., Muccifora, V., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Nowak, W. D., Oganessyan, K., Ohsuga, H., Orlandi, G., Pickert, N., Potashov, S., Potterveld, D. H., Raithel, M., Reggiani, Davide, Reimer, P., Reischl, A., Reolon, A. R., Rith, K., Rosner, G., Rostomyan, A., Rubacek, L., Ryckbosch, D., Salomatin, Y., Sanjiev, I., Savin, Igor A., Scarlett, C., Schafer, A., Schill, C., Schnell, G., Schuler, K. P., Schwind, A., Seidl, R., Seitz, B., Shanidze, R., Shearer, C., Shibata, T. A., Shutov, V., Simani, M. C., Sinram, K., Stancari, Michelle Dawn, Statera, Marco, Steffens, E., Steijger, J. J. M., Stewart, J., Stosslein, U., Tait, P., Tanaka, H., Taroian, S., Tchuiko, B., Terkulov, A., Thomas, E., Tkabladze, A., Trzcinski, A., Tytgat, M., Urciuoli, G. M., van der Nat, P., van der Steenhoven, G., van de Vyver, R., Vetterli, M. C., Vikhrov, V., Vincter, M. G., Visser, J., Vogel, C., Vogt, M., Volmer, J., Weiskopf, C., Wendland, J., Wilbert, J., Wise, T., Yen, S., Yoneyama, S., Zihlmann, B., Zohrabian, H., Zupranski, P., and (Astro)-Particles Physics

Subjects
HERMES experiment, Particle physics, Photon, Physics and Astronomy (miscellaneous), Meson, media_common.quotation_subject, Nuclear Theory, rho(770) electroproduction, electron p inelastic scattering, electron deuteron inelastic scattering, electron polarized beam, polarized target, Phi(1020) electroproduction, spin asymmetry, x-dependence, momentum transfer dependence, transverse momentum dependence, quark strangeness, quark sea, pomeron exchange, magnetic spectrometer, HERMES experimental results, DESY HERA Stored 27.5 GeV, 01 natural sciences, 7. Clean energy, Asymmetry, High Energy Physics - Experiment, 0103 physical sciences, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), media_common, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Parity (physics), 3. Good health, Deuterium, High Energy Physics::Experiment, Nucleon
Abstract

Double-spin asymmetries in the cross section of electroproduction of $\rho^0$ and $\phi$ mesons on the proton and deuteron are measured at the HERMES experiment. The photoabsorption asymmetry in exclusive $\rho^0$ electroproduction on the proton exhibits a positive tendency. This is consistent with theoretical predictions that the exchange of an object with unnatural parity contributes to exclusive $\rho^0$ electroproduction by transverse photons. The photoabsorption asymmetry on the deuteron is found to be consistent with zero. Double-spin asymmetries in $\rho^0$ and $\phi $ meson electroproduction by quasi-real photons were also found to be consistent with zero; the asymmetry in the case of the $\phi$ meson is compatible with a theoretical prediction which involves $s\bar{s}$ knockout from the nucleon., Comment: 8 pages, 7 figures

Published
2003

43. Single spin azimuthal asymmetries in electroproduction of neutral pions in semiinclusive deep inelastic scattering

Author

Airapetian, A., Akopov, N., Akopov, Z., Amarian, M., Aschenauer, E. C., Avakian, H., Avakian, R., Avetissian, A., Avetissian, E., Bailey, P., Bains, B., Baturin, V., Baumgarten, C., Beckmann, M., Belostotski, S., Bernreuther, S., Bianchi, N., Bottcher, H., Borissov, A., Bouhali, O., Bouwhuis, M., Brack, J., Brauksiepe, S., Bruckner, W., Brull, A., Brunn, I., Bulten, H. J., Capitani, G. P., Chumney, P., Cisbani, E., Ciullo, G., Court, G. R., Dalpiaz, P. F., De Leo, R., De Nardo, L., De Sanctis, E., De Schepper, D., Devitsin, E., De Witt Huberts, P. K. A., Di Nezza, P., Djordjadze, V., Duren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Ely, J., Fantoni, A., Fechtchenko, A., Felawka, L., Filippone, B. W., Fischer, H., Fox, B., Franz, J., Frullani, S., Garber, Y., Garibaldi, F., Garutti, E., Gavrilov, G., Gharibyan, V., Golendukhin, A., Graw, G., Grebeniouk, O., Green, P. W., Greeniaus, L. G., Gute, A., Haeberli, W., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Heinsius, F. H., Henoch, M., Hertenberger, R., Hesselink, W. H. A., Hofman, G., Holler, Y., Holt, R. J., Hommez, B., Iarygin, G., Izotov, A., Jackson, H. E., Jgoun, A., Jung, P., Kaiser, R., Kanesaka, J., Kinney, E., Kisselev, A., Kitching, P., Kobayashi, H., Koch, N., Konigsmann, K., Kolster, H., Korotkov, V., Kotik, E., Kozlov, V., Krauss, B., Krivokhijine, V. G., Kyle, G., Lagamba, L., Laziev, A., Lenisa, P., Liebing, P., Lindemann, T., Lorenzon, W., Maas, A., Makins, N. C. R., Marukyan, H., Masoli, F., McAndrew, M., McIlhany, K., Meissner, F., Menden, F., Meyners, N., Mikloukho, O., Miller, C. A., Milner, R., Muccifora, V., Mussa, R., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaeva, K., Nowak, W.-D., Oganessyan, K., O'Neill, T. G., Owen, B. R., Pate, S. F., Potashov, S., Potterveld, D. H., Raithel, M., Rakness, G., Rappoport, V., Redwine, R., Reggiani, D., Reolon, A. R., Rith, K., Robinson, D., Rostomyan, A., Ruh, M., Ryckbosch, D., Sakemi, Y., Sanjiev, I., Sato, F., Savin, I., Scarlett, C., Schafer, A., Schill, C., Schmidt, F., Schnell, G., Schuler, K. P., Schwind, A., Seibert, J., Seitz, B., Shibata, T.-A., Shutov, V., Simani, M. C., Simon, A., Sinram, K., Steffens, E., Steijger, J. J. M., Stewart, J., Stosslein, U., Suetsugu, K., Taroian, S., Terkulov, A., Teryaev, O., Tessarin, S., Thomas, E., Tipton, B., Tytgat, M., Urciuoli, G. M., Van Den Brand, J. F. J., Van Der Steenhoven, G., Van De Vyver, R., Van Hunen, J. J., Vetterli, M. C., Vikhrov, V., Vincter, M. G., Visser, J., Weiskopf, C., Wendland, J., Wilbert, J., Wise, T., Yen, S., Yoneyama, S., and Zohrabian, H.

Subjects
positron p: deep inelastic scattering, polarization: longitudinal, HERMES, transverse momentum dependence, fragmentation function, energy dependence, x-dependence, DESY HERA Stor, 27.5 GeV, p: polarized target, pi0: electroproduction, analyzing power, polarization: transverse, quark: polarization, spin: asymmetry, experimental results
Abstract

Physical review / D 64(9), 097101 (2001). doi:10.1103/PhysRevD.64.097101, A single-spin asymmetry in the azimuthal distribution of neutral pions relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. The analysing power in the sin(phi) moment of the cross section is 0.019 +/- 0.007(stat.) +/- 0.003(syst.). This result is compared to single-spin asymmetries for charged pion production measured in the same kinematic range. The pi^0 asymmetry is of the same size as the pi^+ asymmetry and shows a similar dependence on the relevant kinematic variables. The asymmetry is described by a phenomenological calculation based on a fragmentation function that represents sensitivity to the transverse polarization of the struck quark., Published by Inst., Woodbury, NY

Published
2001
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44. Measurement of the beam spin azimuthal asymmetry associated with deeply virtual Compton scattering

Author

Airapetian, A., Akopov, N., Akopov, Z., Amarian, M., Aschenauer, E. C., Avakian, H., Avakian, R., Avetissian, A., Avetissian, E., Bailey, P., Bains, B., Baturin, V., Baumgarten, C., Beckmann, M., Belostotski, S., Bernreuther, S., Bianchi, N., Bottcher, H., Borissov, A., Bouhali, O., Bouwhuis, M., Brack, J., Brauksiepe, S., Bruckner, W., Brull, A., Brunn, I., Bulten, H. J., Capitani, G. P., Chumney, P., Cisbani, E., Ciullo, G., Court, G. R., Dalpiaz, P. F., De Leo, R., De Nardo, L., De Sanctis, E., De Schepper, D., Devitsin, E., De Witt Huberts, P. K. A., Di Nezza, P., Duren, M., Ehrenfried, M., Elbakian, G., Ellinghaus, F., Ely, J., Fabbri, R., Fantoni, A., Fechtchenko, A., Felawka, L., Filippone, B. W., Fischer, H., Fox, B., Franz, J., Frullani, S., Garber, Y., Garibaldi, F., Garutti, E., Gavrilov, G., Gharibyan, V., Golendukhin, A., Graw, G., Grebeniouk, O., Green, P. W., Greeniaus, L. G., Gute, A., Haeberli, W., Hafidi, K., Hartig, M., Hasch, D., Heesbeen, D., Heinsius, F. H., Henoch, M., Hertenberger, R., Hesselink, W. H. A., Hofman, G., Holler, Y., Holt, R. J., Hommez, B., Iarygin, G., Izotov, A., Jackson, H. E., Jgoun, A., Jung, P., Kaiser, R., Kanesaka, J., Kinney, E., Kisselev, A., Kitching, P., Kobayashi, H., Koch, N., Konigsmann, K., Kolster, H., Korotkov, V., Kotik, E., Kozlov, V., Krauss, B., Krivokhijine, V. G., Kyle, G., Lagamba, L., Laziev, A., Lenisa, P., Liebing, P., Lindemann, T., Lorenzon, W., Maas, A., Makins, N. C. R., Marukyan, H., Masoli, F., McAndrew, M., McIlhany, K., Meissner, F., Menden, F., Meyners, N., Mikloukho, O., Miller, C. A., Milner, R., Muccifora, V., Mussa, R., Nagaitsev, A., Nappi, E., Naryshkin, Y., Nass, A., Negodaeva, K., Nowak, W.-D, Oganessyan, K., O'Neill, T. G., Owen, B. R., Pate, S. F., Potashov, S., Potterveld, D. H., Raithel, M., Rakness, G., Rappoport, V., Redwine, R., Reggiani, D., Reolon, A. R., Rith, K., Robinson, D., Rostomyan, A., Ruh, M., Ryckbosch, D., Sakemi, Y., Sanjiev, I., Sato, F., Savin, I., Scarlett, C., Schafer, A., Schill, C., Schmidt, F., Schnell, G., Schuler, K. P., Schwind, A., Seibert, J., Seitz, B., Shibata, T.-A., Shutov, V., Simani, M. C., Simon, A., Sinram, K., Steffens, E., Steijger, J. J. M., Stewart, J., Stosslein, U., Suetsugu, K., Taroian, S., Terkulov, A., Tessarin, S., Thomas, E., Tipton, B., Tytgat, M., Urciuoli, G. M., Van Den Brand, J. F. J., Van Steenhoven, G., Van Vyver, R., Van Hunen, J. J., Vetterli, M. C., Vikhrov, V., Vincter, M. G., Visser, J., Weiskopf, C., Wendland, J., Wilbert, J., Wise, T., Yen, S., Yoneyama, S., and Zohrabian, H.

Subjects
positron: polarized beam, angular distribution: asymmetry, positron p: deep inelastic scattering, polarization: longitudinal, approximation: Bethe-Heitler, interference, HERMES, photon: electroproduction, helicity: dependence, DESY HERA Stor, analyzing power, Compton scattering: off-shell, 26.7 GeV, experimental results
Abstract

Physical review letters 87(18), 182001 (2001). doi:10.1103/PhysRevLett.87.182001, The beam-spin asymmetry in hard electroproduction of photons has been measured for the first time. The data have been accumulated by the HERMES experiment at DESY using the HERA 27.6 GeV longitudinally polarized positron beam and an unpolarized hydrogen gas target. The asymmetry in the azimuthal distribution of the produced photons in the angle phi relative to the lepton scattering plane was determined with respect to the helicity state of the incoming positron beam. The beam-spin analyzing power in the sin(phi) moment was measured to be -0.23 +/- 0.04(stat) +/- 0.03(syst) in the missing-mass range below 1.7 GeV. The observed asymmetry is attributed to the interference of the Bethe-Heitler and deeply-virtual Compton scattering processes., Published by APS, College Park, Md.

Published
2001
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46. Viscosity, fission time scale and deformation of Dy-156

Author

van't Hof, G, Bacelar, J C S, Dioszegi, I, Harakeh, M N, Hesselink, W H A, Kalantar-Nayestanaki, N, Kugler, A, van der Ploeg, H, Plompen, A J M, van Schagen, J P S, KVI - Center for Advanced Radiation Technology, and Research unit Nuclear & Hadron Physics

Subjects
DYNAMICS, EXCITED NUCLEI, GIANT-DIPOLE RESONANCE, E = 216,238 MeV, statistical model calculations, NEUTRON EMISSION, QUASI-FISSION, Nuclear Theory, GDR parameters, deduced fusion-fission time scale, DY NUCLEI, HEAVY-ION REACTIONS, viscosity, FUSION-FISSION, ANGULAR-MOMENTUM, Nuclear Experiment, Cd-116(Ar-40, X), measured E-gamma, I-gamma, (fragment)gamma-coin, GAMMA-RAY DECAY, compound nucleus features
Abstract

In the fusion-fission reaction Ar-40 + Cd-116 --> Dy-156*, fission, at E-b = 216 MeV and 238 MeV, gamma-rays were measured in coincidence with fission fragments. The interpretation of the gamma-ray spectra is done with the help of a modified version of the statistical-model code CASCADE. The spectra can be reproduced with nuclear viscosities in the range 0.01

Published
1998

47. Signatures for Short-Range Correlations in $\mathrm{^{16}O}$ Observed in the Reaction $\mathrm{^{16}O(e , e' p p)^{14}C}$

Author

Onderwater, C. J. G., Allaart, K., Aschenauer, E. C., Bauer, Th. S., Boersma, D. J., Cisbani, E., Dickhoff, W. H., Frullani, S., Garibaldi, F., Geurts, W. J. W., Giusti, C., Groep, D. L., Hesselink, W. H. A., Iodice, M., Jans, E., Kalantar-Nayestanaki, N., Kasdorp, W.-J., Kormanyos, C., Lapikás, L., Van Leeuwe, J. J., De Leo, R., Misiejuk, A., Müther, H., Pacati, F. D., Pellegrino, A. R., Perrino, R., Starink, R., Steenbakkers, M., Van Der Steenhoven, G., Steijger, J. J. M., Van Uden, M. A., Urciuoli, G. M., Weinstein, L. B., and Willering, H. W.

Subjects
ddc:550
Abstract

Physical review letters 81(11), 2213 - 2216 (1998). doi:10.1103/PhysRevLett.81.2213, The reaction 16O(e,e′pp)14C has been studied at a transferred four-momentum (ω,|q|)=(210MeV,300MeV/c). The differential cross sections for the transitions to the ground state and the lowest excited states in 14C were determined as a function of the momentum of the recoiling 14C nucleus and the angle between the momentum of the proton emitted in the forward direction and the momentum transfer q. A comparison of the data to the results of calculations, performed with a microscopic model, shows clear signatures for short-range correlations in the 16O ground state., Published by APS, College Park, Md.

Published
1998

48. Viscosity and fission time scale of Dy-156

Author

van 't Hof, G, Hesselink, W H A, Plompen, A J M, van Schagen, JPS, Harakeh, M N, Kalantar-Nayestanaki, N, Bacelar, J C S, van der Ploeg, H, Dioszegi, I, Kugler, A, and Research unit Nuclear & Hadron Physics

Subjects
DYNAMICS, NEUTRON EMISSION, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FUSION-FISSION, Nuclear Experiment, DISSIPATION
Abstract

In the fusion-fission reaction Ar-40+Cd-116-->Dy-156-->fission, performed at beam energies E(b) = 216 MeV and 238 MeV, gamma rays were measured in coincidence with fission fragments. The gamma-ray spectra are interpreted using a modified version of the statistical-model code CASCADE. From a comparison of the experimental and calculated spectra it is deduced that the nuclear viscosity is in the range 0.01

Published
1996

49. Almost Wait-free Resizable Hashtables

Author

Gao, H., Gao, H., Groote, J. F., Hesselink, W. H., Gao, H., Gao, H., Groote, J. F., and Hesselink, W. H.

Abstract

In multiprogrammed systems, synchronization often turns out to be a performance bottleneck and the source of poor fault-tolerance. Wait-free and lock-free algorithms can do without locking mechanisms, and therefore do not suffer from these problems. We present an efficient almost wait-free algorithm for parallel accessible hashtables, which promises more robust performance and reliability than conventional lock-based implementations. Our solution is as efficient as sequential hashtables. It can easily be implemented using C-like languages and requires on average only constant time for insertion, deletion or accessing of elements. The algorithm allows the hashtables to grow and shrink when needed. A true problem of wait-free and lock-free algorithms is that they are hard to design correctly, even when apparently straightforward. The reason for this is that processes can execute all statements in every conceivable order. Since our algorithm is quite large and rather complex, we turned to the interactive theorem prover PVS to prove safety of our algorithm, which we could not have done reliably by hand. To our knowledge no algorithms of comparable complexity have ever been mechanically verified. Wait-freedom is shown informally.

Published
2004

50. Investigation of the ExclusiveHe3(e,e′pn)H1Reaction

Author

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

Published
2009
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