Search

Your search keyword '"Spoelgen, D."' showing total 5 results
Start Over Author "Spoelgen, D."
5 results on '"Spoelgen, D."'

1. Measurement of the Spin-Dependence of the pbar-p Interaction at the AD-Ring

Author

Barschel, C., Bechstedt, U., Dietrich, J., Dolfus, N., Engels, R., Gebel, R., Hadamek, H., Haidenbauer, J., Hanhart, C., Kacharava, A., Krol, G., Kueven, M., Langenberg, G., Lehrach, A., Lorentz, B., Maier, R., Martin, S., Meissner, U. -G., Nekipelov, M., Nikolaev, N. N., Oellers, D., d'Orsaneo, G., Prasuhn, D., Rathmann, F., Retzlaff, M., Sarkadi, J., Schleichert, R., Seyfarth, H., Sibirtsev, A., Spoelgen, D., Stein, H. J., Stockhorst, H., Stroeher, H., Weidemann, Chr., Welsch, D., Wieder, P., Barion, L., Bertelli, S., Carassiti, V., Ciullo, G., Contalbrigo, M., Cotta-Ramusino, A., Dalpiaz, P. F., Drago, A., Guidoboni, G., Lenisa, P., Pappalardo, L., Stancari, G., Stancari, M., Statera, M., Azarian, T., Kulikov, A., Kurbatov, V., Macharashvili, G., Merzliakov, S., Meshkov, I. N., Smirnov, A., Tsirkov, D., Uzikov, Yu., Barsov, S., Belostotski, S., Grigoryev, K., Kravtsov, P., Mikirtychiants, M., Mikirtychiants, S., Vasilyev, A., Esser, F. M., Greven, R., Hansen, G., Jadgfeld, F., Klehr, F., Soltner, H., Straatmann, H., Chiladze, D., Garishvili, A., Lomidze, N., Mchedlishvili, D., Nioradze, M., Tabidze, M., Akopov, N., Avetisyan, A., Elbakyan, G., Marukyan, H., Taroian, S., Benati, P., Erven, W., Kayser, F. J., Kleines, H., Wuestner, P., Bruncko, D., Ferencei, J., Musinsky, J., Urban, J., Augustyniak, W., Marianski, B., Trzcinski, A., Zupranski, P., Dymov, S., Nass, A., Steffens, E., Rathsman, K., Tegner, P. E., Engblom, P. Thoerngren, De Leo, R., Tagliente, G., Kaempfer, B., Trusov, S., Buttimore, N., and Meyer, H. O.

Subjects
Nuclear Experiment
Abstract

We propose to use an internal polarized hydrogen storage cell gas target in the AD ring to determine for the first time the two total spin-dependent pbar-p cross sections sigma_1 and sigma_2 at antiproton beam energies in the range from 50 to 450 MeV. The data obtained are of interest by themselves for the general theory of pbar-p interactions since they will provide a first experimental constraint of the spin-spin dependence of the nucleon-antinucleon potential in the energy range of interest. In addition, measurements of the polarization buildup of stored antiprotons are required to define the optimum parameters of a future, dedicated Antiproton Polarizer Ring (APR), intended to feed a double-polarized asymmetric pbar-p collider with polarized antiprotons. Such a machine has recently been proposed by the PAX collaboration for the new Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt, Germany. The availability of an intense stored beam of polarized antiprotons will provide access to a wealth of single- and double-spin observables, thereby opening a new window on QCD spin physics., Comment: 51 pages, 23 figures, proposal submitted to the SPS committee of CERN

Published
2009

2. Polarizing a stored proton beam by spin flip?

Author

Oellers, D., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dietrich, J., Dolfus, N., Dymov, S., Engels, R., Erven, W., Garishvili, A., Gebel, R., Goslawski, P., Grigoryev, K., Hadamek, H., Kacharava, A., Khoukaz, A., Kulikov, A., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Martin, S., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N. N., Nioradze, M., d'Orsaneo, G., Papenbrock, M., Prasuhn, D., Rathmann, F., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Sowinski, J., Spoelgen, D., Stancari, G., Stancari, M., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatmann, H., Stroeher, H., Tabidze, M., Tagliente, G., Engblom, P. Thoerngren, Trusov, S., Vasilyev, A., Weidemann, Chr., Welsch, D., Wieder, P., Wuestner, P., and Zupranski, P.

Subjects
Nuclear Experiment
Abstract

We discuss polarizing a proton beam in a storage ring, either by selective removal or by spin flip of the stored ions. Prompted by recent, conflicting calculations, we have carried out a measurement of the spin flip cross section in low-energy electron-proton scattering. The experiment uses the cooling electron beam at COSY as an electron target. The measured cross sections are too small for making spin flip a viable tool in polarizing a stored beam. This invalidates a recent proposal to use co-moving polarized positrons to polarize a stored antiproton beam., Comment: 18 pages, 6 figures

Published
2009
Full Text
View/download PDF

3. Measurement of the Spin–Dependence of the $\overline{p}-p$ Interaction at the AD–Ring

Author

Barschel, C., Bechstedt, U., Dietrich, J., Dolfus, N., Engels, R., Gebel, R., Hadamek, H., Haidenbauer, J., Hanhart, C., Kacharava, A., Krol, G., Kueven, M., Langenberg, G., Lehrach, A., Lorentz, B., Maier, R., Martin, S., Meissner, U.-G., Nekipelov, M., Nikolaev, N.N., Oellers, D., d'Orsaneo, G., Prasuhn, D., Rathmann, F., Retzlaff, M., Sarkadi, J., Schleichert, R., Seyfarth, H., Sibirtsev, A., Spoelgen, D., Stein, H.J., Stockhorst, H., Stroeher, H., Weidemann, Chr., Welsch, D., Wieder, P., Barion, L., Bertelli, S., Carassiti, V., Ciullo, G., Contalbrigo, M., Cotta-Ramusino, A., Dalpiaz, P.F., Drago, A., Guidoboni, G., Lenisa, P., Pappalardo, L., Stancari, G., Stancari, M., Statera, M., Azarian, T., Kulikov, A., Kurbatov, V., Macharashvili, G., Merzliakov, S., Meshkov, I.N., Smirnov, A., Tsirkov, D., Uzikov, Yu., Barsov, S., Belostotski, S., Grigoryev, K., Kravtsov, P., Mikirtychiants, M., Mikirtychiants, S., Vasilyev, A., Esser, F.M., Greven, R., Hansen, G., Jadgfeld, F., Klehr, F., Soltner, H., Straatmann, H., Chiladze, D., Garishvili, A., Lomidze, N., Mchedlishvili, D., Nioradze, M., Tabidze, M., Akopov, N., Avetisyan, A., Elbakyan, G., Marukyan, H., Taroian, S., Benati, P., Erven, W., Kayser, F.J., Kleines, H., Wuestner, P., Bruncko, D., Ferencei, J., Musinsky, J., Urban, J., Augustyniak, W., Marianski, B., Trzcinski, A., Zupranski, P., Dymov, S., Nass, A., Steffens, E., Rathsman, K., Tegner, P.E., Engblom, P. Thoerngren, De Leo, R., Tagliente, G., Kaempfer, B., Trusov, S., Buttimore, N., and Meyer, H.O.

Subjects
Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Physics - Experiment, Detectors and Experimental Techniques, Nuclear Experiment
Abstract

We propose to use an internal polarized hydrogen storage cell gas target in the AD ring to determine for the first time the two total spin–dependent pbar-p cross sections σ1 and σ2 at antiproton beam energies in the range from 50 to 450 MeV. The data obtained are of interest by themselves for the general theory of pbar-p interactions since they will provide a first experimental constraint of the spin–spin dependence of the nucleon–antinucleon potential in the energy range of interest. In addition, measurements of the polarization buildup of stored antiprotons are required to define the optimum parameters of a future, dedicated Antiproton Polarizer Ring (APR), intended to feed a double–polarized asymmetric pbar-p collider with polarized antiprotons. Such a machine has recently been proposed by the PAX collaboration for the new Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt, Germany. The availability of an intense stored beam of polarized antiprotons will provide access to a wealth of single– and double–spin observables, thereby opening a new window on QCD spin physics. A recent experiment at COSY revealed that ep spin–flip cross sections are too small to cause a detectable depolarization of a stored proton beam. This measurement rules out a proposal to use polarized positrons to polarize an antiproton beam by e+pbar spin–flip interactions. Thus, our approach to provide a beam of polarized antiprotons is based on spin filtering, using an internal polarized hydrogen gas target – a method that has been tested with stored protons. We expect to produce a polarized antiproton beam with at least ten orders of magnitude higher intensity than a secondary polarized antiproton beam previously available. Provided that antiproton beams with a polarization of about 15% can be obtained with the APR, the antiproton machine at FAIR (the High Energy Storage Ring) could be converted into a double–polarized asymmetric pbar-p collider by installation of an additional COSY–like ring. In this setup, antiprotons of 3.5 GeV/c collide with protons of 15 GeV/c at c.m. energies of √s ≈ √200 GeV with a luminosity in excess of 10^31 cm−2s−1. The PAX physics program proposed for FAIR has been highly rated, and would include, most importantly, a first direct measurement of the transversity distribution of the valence quarks in the proton, and a first measurement of the moduli and the relative phase of the time–like electric and magnetic form factors G_E,M of the proton. We propose to use an internal polarized hydrogen storage cell gas target in the AD ring to determine for the first time the two total spin-dependent pbar-p cross sections sigma_1 and sigma_2 at antiproton beam energies in the range from 50 to 450 MeV. The data obtained are of interest by themselves for the general theory of pbar-p interactions since they will provide a first experimental constraint of the spin-spin dependence of the nucleon-antinucleon potential in the energy range of interest. In addition, measurements of the polarization buildup of stored antiprotons are required to define the optimum parameters of a future, dedicated Antiproton Polarizer Ring (APR), intended to feed a double-polarized asymmetric pbar-p collider with polarized antiprotons. Such a machine has recently been proposed by the PAX collaboration for the new Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt, Germany. The availability of an intense stored beam of polarized antiprotons will provide access to a wealth of single- and double-spin observables, thereby opening a new window on QCD spin physics.

Published
2009

4. Measurement of the eta -> 3 pi(0) Dalitz plot distribution with the WASA detector at COSY

Author

Adolph, C, Angelstein, M, Bashkanov, M, Bechstedt, U, Belostotski, S, Berlowski, M, Bhatt, H, Bisplinghoff, J, Bondar, A, Borasoy, B, Buescher, M, Calèn, H, Chandwani, K, Clement, H, Czerwinski, E, Czyzykiewicz, R, D'Orsaneo, G, Duniec, D, Ekström, C, Engels, R, Erven, W, Eyrich, W, Fedorets, P, Felden, O, Fransson, K, Gil, D, Goldenbaum, F, Grigoryev, K, Heczko, A, Hanhart, C, Hejny, V, Hinterberger, F, Hodana, M, Hoeistad, B, Izotov, A, Jacewicz, M, Janusz, M, Jany, R, Jarczyk, L, Johansson, T, Kamys, B, Kemmerling, G, Keshelashvili, I, Khakimova, O, Khoukaz, A, Kilian, K, Kimura, N, Kistryn, S, Klaja, J, Klaja, P, Kleines, H, Klos, B, Kowalczyk, A, Kren, F, Krzemien, W, Kulessa, P, Kullander, S, Kupsc, A, Kuzmin, A, Kyryanchuk, V, Majewski, J, Machner, H, Magiera, A, Maier, R, Marciniewski, R, Migdal, W, Meissner, U.-G., Mikirtychiants, M, Miklukho, O, Milke, N, Mittag, M, Moskal, P, Nandi, K, Nawrot, A, Nissler, R, Odoyo, A, Oelert, W, Ohm, H, Paul, N, Pauly, C, Petukhov, Y, Piskunov, N, Plucinski, P, Podkopal, P, Povtoreyko, A, Prasuhn, D, Pricking, A, Pysz, K, Rachowski, J, Rausmann, T, Redmer, F, Ritman, J, Roy, A, Ruber, R. J. M. Y, Rudy, Z, Salmin, R, Schadmand, S, Schmidt, A, Schneider, H, Schroeder, W, Scobel, W, Sefzick, T, Serdyuk, V, Shah, N, Siemaszko, M, Siudak, R, Skorodko, T, Smolinski, T, Smyrski, J, Sopov, V, Spoelgen, D, Stepaniak, J, Sterzenbach, G, Stroeher, H, Szczurek, A, Teufel, A, Tolba, T, Trzcinski, A, Ulbrich, K, Varma, R, Vlasov, P, Weglorz, W, Winnemoeller, A, Wirzba, A, Wolke, M, Wronska, A, Wuestner, R, Xu, H, Yamamoto, A, Yamaoka, H, Yuan, X, Yurev, L, Zabierowski, J, Zheng, C, Zielinski, J, Zipper, W, Zlomanczuk, J, Zwoll, K, Zychor, I, Adolph, C, Angelstein, M, Bashkanov, M, Bechstedt, U, Belostotski, S, Berlowski, M, Bhatt, H, Bisplinghoff, J, Bondar, A, Borasoy, B, Buescher, M, Calèn, H, Chandwani, K, Clement, H, Czerwinski, E, Czyzykiewicz, R, D'Orsaneo, G, Duniec, D, Ekström, C, Engels, R, Erven, W, Eyrich, W, Fedorets, P, Felden, O, Fransson, K, Gil, D, Goldenbaum, F, Grigoryev, K, Heczko, A, Hanhart, C, Hejny, V, Hinterberger, F, Hodana, M, Hoeistad, B, Izotov, A, Jacewicz, M, Janusz, M, Jany, R, Jarczyk, L, Johansson, T, Kamys, B, Kemmerling, G, Keshelashvili, I, Khakimova, O, Khoukaz, A, Kilian, K, Kimura, N, Kistryn, S, Klaja, J, Klaja, P, Kleines, H, Klos, B, Kowalczyk, A, Kren, F, Krzemien, W, Kulessa, P, Kullander, S, Kupsc, A, Kuzmin, A, Kyryanchuk, V, Majewski, J, Machner, H, Magiera, A, Maier, R, Marciniewski, R, Migdal, W, Meissner, U.-G., Mikirtychiants, M, Miklukho, O, Milke, N, Mittag, M, Moskal, P, Nandi, K, Nawrot, A, Nissler, R, Odoyo, A, Oelert, W, Ohm, H, Paul, N, Pauly, C, Petukhov, Y, Piskunov, N, Plucinski, P, Podkopal, P, Povtoreyko, A, Prasuhn, D, Pricking, A, Pysz, K, Rachowski, J, Rausmann, T, Redmer, F, Ritman, J, Roy, A, Ruber, R. J. M. Y, Rudy, Z, Salmin, R, Schadmand, S, Schmidt, A, Schneider, H, Schroeder, W, Scobel, W, Sefzick, T, Serdyuk, V, Shah, N, Siemaszko, M, Siudak, R, Skorodko, T, Smolinski, T, Smyrski, J, Sopov, V, Spoelgen, D, Stepaniak, J, Sterzenbach, G, Stroeher, H, Szczurek, A, Teufel, A, Tolba, T, Trzcinski, A, Ulbrich, K, Varma, R, Vlasov, P, Weglorz, W, Winnemoeller, A, Wirzba, A, Wolke, M, Wronska, A, Wuestner, R, Xu, H, Yamamoto, A, Yamaoka, H, Yuan, X, Yurev, L, Zabierowski, J, Zheng, C, Zielinski, J, Zipper, W, Zlomanczuk, J, Zwoll, K, and Zychor, I

Abstract

In the first production run of the WASA experiment at COSY, the eta decay into three neutral pions was measured in proton-proton interactions at a proton beam kinetic energy of 1.4 GeV. The Dalitz plot of the three pious was Studied using 1.2 x 10(5) fully reconstructed events. and the quadratic slope parameter alpha was determined to be -0.027 +/- 0.008(stat) +/- 0.005(syst). The result is consistent with previous measurements and further corroborates the importance of pion-pion final state interactions. (C) 2009 Elsevier B.V. All rights reserved.

Published
2009
Full Text
View/download PDF

5. Polarizing a stored proton beam by spin flip?

Author

Oellers, D., primary, Barion, L., additional, Barsov, S., additional, Bechstedt, U., additional, Benati, P., additional, Bertelli, S., additional, Chiladze, D., additional, Ciullo, G., additional, Contalbrigo, M., additional, Dalpiaz, P.F., additional, Dietrich, J., additional, Dolfus, N., additional, Dymov, S., additional, Engels, R., additional, Erven, W., additional, Garishvili, A., additional, Gebel, R., additional, Goslawski, P., additional, Grigoryev, K., additional, Hadamek, H., additional, Kacharava, A., additional, Khoukaz, A., additional, Kulikov, A., additional, Langenberg, G., additional, Lehrach, A., additional, Lenisa, P., additional, Lomidze, N., additional, Lorentz, B., additional, Macharashvili, G., additional, Maier, R., additional, Martin, S., additional, Merzliakov, S., additional, Meshkov, I.N., additional, Meyer, H.O., additional, Mielke, M., additional, Mikirtychiants, M., additional, Mikirtychiants, S., additional, Nass, A., additional, Nekipelov, M., additional, Nikolaev, N.N., additional, Nioradze, M., additional, d'Orsaneo, G., additional, Papenbrock, M., additional, Prasuhn, D., additional, Rathmann, F., additional, Sarkadi, J., additional, Schleichert, R., additional, Smirnov, A., additional, Seyfarth, H., additional, Sowinski, J., additional, Spoelgen, D., additional, Stancari, G., additional, Stancari, M., additional, Statera, M., additional, Steffens, E., additional, Stein, H.J., additional, Stockhorst, H., additional, Straatmann, H., additional, Ströher, H., additional, Tabidze, M., additional, Tagliente, G., additional, Engblom, P. Thörngren, additional, Trusov, S., additional, Vasilyev, A., additional, Weidemann, Chr., additional, Welsch, D., additional, Wieder, P., additional, Wüstner, P., additional, and Zupranski, P., additional

Published
2009
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results