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71 results on '"Gebel, R."'

1. Spin decoherence and off-resonance behavior of radiofrequency-driven spin rotations in storage rings

Author: Nikolaev, N. N., Rathmann, F., Slim, J., Andres, A., Hejny, V., Nass, A., Kacharava, A., Lenisa, P., Pretz, J., Saleev, A., Shmakova, V., Soltner, H., Abusaif, F., Aggarwal, A., Aksentev, A., Alberdi, B., Barion, L., Bekman, I., Beyß, M., Böhme, C., Breitkreutz, B., Canale, N., Ciullo, G., Dymov, S., Fröhlich, N. -O., Gebel, R., Gaisser, M., Grigoryev, K., Grzonka, D., Hetzel, J., Javakhishvili, O., Kamerdzhiev, V., Karanth, S., Keshelashvili, I., Kononov, A., Laihem, K., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Magiera, A., Mchedlishvili, D., Melnikov, A., Müller, F., Pesce, A., Poncza, V., Prasuhn, D., Shergelashvili, D., Shurkhno, N., Siddique, S., Silenko, A., Stassen, S., Stephenson, E. J., Ströher, H., Tabidze, M., Tagliente, G., Valdau, Y., Vitz, M., Wagner, T., Wirzba, A., Wrońska, A., Wüstner, P., Żurek, M., Nikolaev, N. N., Rathmann, F., Slim, J., Andres, A., Hejny, V., Nass, A., Kacharava, A., Lenisa, P., Pretz, J., Saleev, A., Shmakova, V., Soltner, H., Abusaif, F., Aggarwal, A., Aksentev, A., Alberdi, B., Barion, L., Bekman, I., Beyß, M., Böhme, C., Breitkreutz, B., Canale, N., Ciullo, G., Dymov, S., Fröhlich, N. -O., Gebel, R., Gaisser, M., Grigoryev, K., Grzonka, D., Hetzel, J., Javakhishvili, O., Kamerdzhiev, V., Karanth, S., Keshelashvili, I., Kononov, A., Laihem, K., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Magiera, A., Mchedlishvili, D., Melnikov, A., Müller, F., Pesce, A., Poncza, V., Prasuhn, D., Shergelashvili, D., Shurkhno, N., Siddique, S., Silenko, A., Stassen, S., Stephenson, E. J., Ströher, H., Tabidze, M., Tagliente, G., Valdau, Y., Vitz, M., Wagner, T., Wirzba, A., Wrońska, A., Wüstner, P., and Żurek, M.
Abstract: Radiofrequency-driven resonant spin rotators are routinely used as standard instruments in polarization experiments in particle and nuclear physics. Maintaining the continuous exact parametric spin-resonance condition of the equality of the spin rotator and the spin precession frequency during operation constitutes one of the challenges. We present a detailed analytic description of the impact of detuning the exact spin resonance on the vertical and the in-plane precessing components of the polarization. An important part of the formalism presented here is the consideration of experimentally relevant spin-decoherence effects. We discuss applications of the developed formalism to the interpretation of the experimental data on the novel pilot bunch approach to control the spin-resonance condition during the operation of the radiofrequency-driven Wien filter that is used as a spin rotator in the first direct deuteron electric dipole moment measurement at COSY. We emphasize the potential importance of the hitherto unexplored phase of the envelope of the horizontal polarization as an indicator of the stability of the radiofrequency-driven spin rotations in storage rings. The work presented here serves as a satellite publication to the work published concurrently on the proof of principle experiment about the so-called pilot bunch approach that was developed to provide co-magnetometry for the deuteron electric dipole moment experiment at COSY., Comment: 31 pages, 10 figures, 5 tables
Published: 2023

2. Pilot bunch and co-magnetometry of polarized particles stored in a ring

Author: Slim, J., Rathmann, F., Andres, A., Hejny, V., Nass, A., Kacharava, A., Lenisa, P., Nikolaev, N. N., Pretz, J., Saleev, A., Shmakova, V., Soltner, H., Abusaif, F., Aggarwal, A., Aksentev, A., Alberdi, B., Barion, L., Bekman, I., Beyß, M., Böhme, C., Breitkreutz, B., Canale, N., Ciullo, G., Dymov, S., Fröhlich, N. -O., Gebel, R., Gaisser, M., Grigoryev, K., Grzonka, D., Hetzel, J., Javakhishvili, O., Kamerdzhiev, V., Karanth, S., Keshelashvili, I., Kononov, A., Laihem, K., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Magiera, A., Mchedlishvili, D., Melnikov, A., Müller, F., Pesce, A., Poncza, V., Prasuhn, D., Shergelashvili, D., Shurkhno, N., Siddique, S., Silenko, A., Stassen, S., Stephenson, E. J., Ströher, H., Tabidze, M., Tagliente, G., Valdau, Y., Vitz, M., Wagner, T., Wirzba, A., Wrońska, A., Wüstner, P., Żurek, M., Slim, J., Rathmann, F., Andres, A., Hejny, V., Nass, A., Kacharava, A., Lenisa, P., Nikolaev, N. N., Pretz, J., Saleev, A., Shmakova, V., Soltner, H., Abusaif, F., Aggarwal, A., Aksentev, A., Alberdi, B., Barion, L., Bekman, I., Beyß, M., Böhme, C., Breitkreutz, B., Canale, N., Ciullo, G., Dymov, S., Fröhlich, N. -O., Gebel, R., Gaisser, M., Grigoryev, K., Grzonka, D., Hetzel, J., Javakhishvili, O., Kamerdzhiev, V., Karanth, S., Keshelashvili, I., Kononov, A., Laihem, K., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Magiera, A., Mchedlishvili, D., Melnikov, A., Müller, F., Pesce, A., Poncza, V., Prasuhn, D., Shergelashvili, D., Shurkhno, N., Siddique, S., Silenko, A., Stassen, S., Stephenson, E. J., Ströher, H., Tabidze, M., Tagliente, G., Valdau, Y., Vitz, M., Wagner, T., Wirzba, A., Wrońska, A., Wüstner, P., and Żurek, M.
Abstract: In polarization experiments at storage rings, one of the challenges is to maintain the spin-resonance condition of a radio-frequency spin rotator with the spin-precessions of the orbiting particles. Time-dependent variations of the magnetic fields of ring elements lead to unwanted variations of the spin precession frequency. We report here on a solution to this problem by shielding (or masking) one of the bunches stored in the ring from the high-frequency fields of the spin rotator, so that the masked pilot bunch acts as a co-magnetometer for the other signal bunch, tracking fluctuations in the ring on a time scale of about one second. While the new method was developed primarily for searches of electric dipole moments of charged particles, it may have far-reaching implications for future spin physics facilities, such as the EIC and NICA., Comment: 5 pages, 3 figures + references + supplemental material (6 pages, 2 figures, 6 tables + references)
Published: 2023

3. Measurement of deuteron carbon vector analyzing powers in the kinetic energy range 170-380 MeV

Author: JEDI Collaboration, Müller, F., Zurek, M., Bagdasarian, Z., Barion, L., Berz, M., Ciepal, I., Ciullo, G., Dymov, S., Eversmann, D., Gaisser, M., Gebel, R., Grigoryev, K., Grzonka, D., Hejny, V., Hempelmann, N., Hetzel, J., Hinder, F., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Mchedlishvili, D., Nass, A., Nikolaev, N. N., Pesce, A., Prasuhn, D., Pretz, J., Rathmann, F., Rolando, V., Rosenthal, M., Saleev, A., Schmidt, V., Senichev, Y., Shergelashvili, D., Shmakova, V., Silenko, A., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stephenson, E., Ströher, H., Tabidze, M., Tagliente, G., Talman, R., Trinkel, F., Uzikov, Yu., Valdau, Yu., Valetov, E., Weidemann, C., Wronska, A., Wüstner, P., JEDI Collaboration, Müller, F., Zurek, M., Bagdasarian, Z., Barion, L., Berz, M., Ciepal, I., Ciullo, G., Dymov, S., Eversmann, D., Gaisser, M., Gebel, R., Grigoryev, K., Grzonka, D., Hejny, V., Hempelmann, N., Hetzel, J., Hinder, F., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Mchedlishvili, D., Nass, A., Nikolaev, N. N., Pesce, A., Prasuhn, D., Pretz, J., Rathmann, F., Rolando, V., Rosenthal, M., Saleev, A., Schmidt, V., Senichev, Y., Shergelashvili, D., Shmakova, V., Silenko, A., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stephenson, E., Ströher, H., Tabidze, M., Tagliente, G., Talman, R., Trinkel, F., Uzikov, Yu., Valdau, Yu., Valetov, E., Weidemann, C., Wronska, A., and Wüstner, P.
Abstract: A measurement of vector analyzing powers in elastic deuteron-carbon scattering has been performed at the Cooler Synchrotron COSY of Forschungszentrum J\"ulich, Germany. Seven kinetic beam energies between 170 and 380 MeV have been used. A vector-polarized beam from a polarized deuteron source was injected, accelerated to the final desired energy and stored in COSY. A thin needle-shaped diamond strip was used as a carbon target, onto which the beam was slowly steered. Elastically scattered deuterons were identified in the forward direction using various layers of scintillators and straw tubes. Where data exist in the literature (at 200 and 270 MeV), excellent agreement of the angular shape was found. The beam polarization of the presented data was deduced by fitting the absolute scale of the analyzing power to these references. Our results extend the world data set and are necessary for polarimetry of future electric dipole moment searches at storage rings. They will as well serve as an input for theoretical description of polarized hadron-hadron scattering.
Published: 2020

4. Measurement of deuteron carbon vector analyzing powers in the kinetic energy range 170-380 MeV

Author: JEDI Collaboration, Müller, F., Zurek, M., Bagdasarian, Z., Barion, L., Berz, M., Ciepal, I., Ciullo, G., Dymov, S., Eversmann, D., Gaisser, M., Gebel, R., Grigoryev, K., Grzonka, D., Hejny, V., Hempelmann, N., Hetzel, J., Hinder, F., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Mchedlishvili, D., Nass, A., Nikolaev, N. N., Pesce, A., Prasuhn, D., Pretz, J., Rathmann, F., Rolando, V., Rosenthal, M., Saleev, A., Schmidt, V., Senichev, Y., Shergelashvili, D., Shmakova, V., Silenko, A., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stephenson, E., Ströher, H., Tabidze, M., Tagliente, G., Talman, R., Trinkel, F., Uzikov, Yu., Valdau, Yu., Valetov, E., Weidemann, C., Wronska, A., Wüstner, P., JEDI Collaboration, Müller, F., Zurek, M., Bagdasarian, Z., Barion, L., Berz, M., Ciepal, I., Ciullo, G., Dymov, S., Eversmann, D., Gaisser, M., Gebel, R., Grigoryev, K., Grzonka, D., Hejny, V., Hempelmann, N., Hetzel, J., Hinder, F., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Mchedlishvili, D., Nass, A., Nikolaev, N. N., Pesce, A., Prasuhn, D., Pretz, J., Rathmann, F., Rolando, V., Rosenthal, M., Saleev, A., Schmidt, V., Senichev, Y., Shergelashvili, D., Shmakova, V., Silenko, A., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stephenson, E., Ströher, H., Tabidze, M., Tagliente, G., Talman, R., Trinkel, F., Uzikov, Yu., Valdau, Yu., Valetov, E., Weidemann, C., Wronska, A., and Wüstner, P.
Abstract: A measurement of vector analyzing powers in elastic deuteron-carbon scattering has been performed at the Cooler Synchrotron COSY of Forschungszentrum J\"ulich, Germany. Seven kinetic beam energies between 170 and 380 MeV have been used. A vector-polarized beam from a polarized deuteron source was injected, accelerated to the final desired energy and stored in COSY. A thin needle-shaped diamond strip was used as a carbon target, onto which the beam was slowly steered. Elastically scattered deuterons were identified in the forward direction using various layers of scintillators and straw tubes. Where data exist in the literature (at 200 and 270 MeV), excellent agreement of the angular shape was found. The beam polarization of the presented data was deduced by fitting the absolute scale of the analyzing power to these references. Our results extend the world data set and are necessary for polarimetry of future electric dipole moment searches at storage rings. They will as well serve as an input for theoretical description of polarized hadron-hadron scattering.
Published: 2020

5. A New Beam Polarimeter at COSY to Search for Electric Dipole Moments of Charged Particles

Author: Müller, F., Javakhishvili, O., Shergelashvili, D., Keshelashvili, I., Mchedlishvili, D., Abusaif, F., Aggarwal, A., Barion, L., Basile, S., Böker, J., Canale, N., Ciullo, G., Dymov, S., Felden, O., Gagoshidze, M., Gebel, R., Demary, N., Grigoryev, K., Grzonka, D., Hahnraths, T., Hejny, V., Kacharava, A., Kamerdzhiev, V., Karanth, S., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Magiera, A., Metreveli, Z., Nass, A., Nikolaev, N. N., Nioradze, M., Pesce, A., Poncza, V., Prasuhn, D., Pretz, J., Rathmann, F., Saleev, A., Sefzick, T., Senichev, Yu., Shmakova, V., Slim, J., Soltner, H., Stephenson, E., Ströher, H., Tabidze, M., Tagliente, G., Uzikov, Yu., Valdau, Yu., Wagner, T., Wrońska, A., Wüstner, P., Żurek, M., Müller, F., Javakhishvili, O., Shergelashvili, D., Keshelashvili, I., Mchedlishvili, D., Abusaif, F., Aggarwal, A., Barion, L., Basile, S., Böker, J., Canale, N., Ciullo, G., Dymov, S., Felden, O., Gagoshidze, M., Gebel, R., Demary, N., Grigoryev, K., Grzonka, D., Hahnraths, T., Hejny, V., Kacharava, A., Kamerdzhiev, V., Karanth, S., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Magiera, A., Metreveli, Z., Nass, A., Nikolaev, N. N., Nioradze, M., Pesce, A., Poncza, V., Prasuhn, D., Pretz, J., Rathmann, F., Saleev, A., Sefzick, T., Senichev, Yu., Shmakova, V., Slim, J., Soltner, H., Stephenson, E., Ströher, H., Tabidze, M., Tagliente, G., Uzikov, Yu., Valdau, Yu., Wagner, T., Wrońska, A., Wüstner, P., and Żurek, M.
Abstract: A calorimetric polarimeter based on inorganic LYSO scintillators is described. It has been designed for use in a storage ring to search for electric dipole moments (EDM) of charged particles such as the proton and deuteron. Its development and first use was on the Cooler Synchrotron (COSY) at the Forschungszentrum J\"ulich with 0.97 GeV/c polarized deuterons, a particle and energy suitable for an EDM search. The search requires a polarimeter with high efficiency, large analyzing power, and stable operating characteristics. With typical beam momenta of about 1 GeV/c, the scattering of protons or deuterons from a carbon target into forward angles becomes a nearly optimal choice of an analyzing reaction. The polarimeter described here consists of 52 LYSO detector modules, arranged in 4 symmetric blocks (up, down, left, right) for energy determination behind plastic scintillators for particle identification via energy loss. The commissioning results of the current setup demonstrate that the polarimeter is ready to be employed in a first direct search for an EDM on the deuteron, which is planned at COSY in the next two years.
Published: 2020
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6. Storage Ring to Search for Electric Dipole Moments of Charged Particles -- Feasibility Study

Author: Abusaif, F., Aggarwal, A., Aksentev, A., Alberdi-Esuain, B., Andres, A., Atanasov, A., Barion, L., Basile, S., Berz, M., Böhme, C., Böker, J., Borburgh, J., Canale, N., Carli, C., Ciepał, I., Ciullo, G., Contalbrigo, M., De Conto, J. -M., Dymov, S., Felden, O., Gaisser, M., Gebel, R., Giese, N., Gooding, J., Grigoryev, K., Grzonka, D., Tahar, M. Haj, Hahnraths, T., Heberling, D., Hejny, V., Hetzel, J., Hölscher, D., Javakhishvili, O., Jorat, L., Kacharava, A., Kamerdzhiev, V., Karanth, S., Keshelashvili, I., Koop, I., Kulikov, A., Laihem, K., Lamont, M., Lehrach, A., Lenisa, P., Lomidze, I., Lomidze, N., Lorentz, B., Macharashvili, G., Magiera, A., Makino, K., Martin, S., Mchedlishvili, D., Meißner, U. -G., Metreveli, Z., Michaud, J., Müller, F., Nass, A., Natour, G., Nikolaev, N., Nogga, A., Okropiridze, D., Pesce, A., Poncza, V., Prasuhn, D., Pretz, J., Rathmann, F., Ritman, J., Rosenthal, M., Saleev, A., Schott, M., Sefzick, T., Senichev, Y., Shankar, R., Shergelashvili, D., Shmakova, V., Siddique, S., Silenko, A., Simon, M., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stephenson, E., Straatmann, H., Ströher, H., Tabidze, M., Tagliente, G., Talman, R., Uzikov, Y., Valdau, Y., Valetov, E., Vilella, E., Vitz, M., Vossebeld, J., Wagner, T., Weidemann, C., Wirzba, A., Wrońska, A., Wüstner, P., Zupranski, P., Żurek, M., Abusaif, F., Aggarwal, A., Aksentev, A., Alberdi-Esuain, B., Andres, A., Atanasov, A., Barion, L., Basile, S., Berz, M., Böhme, C., Böker, J., Borburgh, J., Canale, N., Carli, C., Ciepał, I., Ciullo, G., Contalbrigo, M., De Conto, J. -M., Dymov, S., Felden, O., Gaisser, M., Gebel, R., Giese, N., Gooding, J., Grigoryev, K., Grzonka, D., Tahar, M. Haj, Hahnraths, T., Heberling, D., Hejny, V., Hetzel, J., Hölscher, D., Javakhishvili, O., Jorat, L., Kacharava, A., Kamerdzhiev, V., Karanth, S., Keshelashvili, I., Koop, I., Kulikov, A., Laihem, K., Lamont, M., Lehrach, A., Lenisa, P., Lomidze, I., Lomidze, N., Lorentz, B., Macharashvili, G., Magiera, A., Makino, K., Martin, S., Mchedlishvili, D., Meißner, U. -G., Metreveli, Z., Michaud, J., Müller, F., Nass, A., Natour, G., Nikolaev, N., Nogga, A., Okropiridze, D., Pesce, A., Poncza, V., Prasuhn, D., Pretz, J., Rathmann, F., Ritman, J., Rosenthal, M., Saleev, A., Schott, M., Sefzick, T., Senichev, Y., Shankar, R., Shergelashvili, D., Shmakova, V., Siddique, S., Silenko, A., Simon, M., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stephenson, E., Straatmann, H., Ströher, H., Tabidze, M., Tagliente, G., Talman, R., Uzikov, Y., Valdau, Y., Valetov, E., Vilella, E., Vitz, M., Vossebeld, J., Wagner, T., Weidemann, C., Wirzba, A., Wrońska, A., Wüstner, P., Zupranski, P., and Żurek, M.
Abstract: The proposed method exploits charged particles confined as a storage ring beam (proton, deuteron, possibly $^3$He) to search for an intrinsic electric dipole moment (EDM) aligned along the particle spin axis. Statistical sensitivities could approach 10$^{-29}$ e$\cdot$cm. The challenge will be to reduce systematic errors to similar levels. The ring will be adjusted to preserve the spin polarisation, initially parallel to the particle velocity, for times in excess of 15 minutes. Large radial electric fields, acting through the EDM, will rotate the polarisation from the longitudinal to the vertical direction. The slow rise in the vertical polarisation component, detected through scattering from a target, signals the EDM. The project strategy is outlined. A stepwise plan is foreseen, starting with ongoing COSY activities that demonstrate technical feasibility. Achievements to date include reduced polarization measurement errors, long horizontal plane polarization lifetimes, and control of the polarization direction through feedback from scattering measurements. The project continues with a proof-of-capability measurement (precursor experiment; first direct deuteron EDM measurement), an intermediate prototype ring (proof-of-principle; demonstrator for key technologies), and finally a high-precision electric-field storage ring., Comment: 243 pages
Published: 2019
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7. Phase measurement for driven spin oscillations in a storage ring

Author: Hempelmann, N., Hejny, V., Pretz, J., Soltner, H., Augustyniak, W., Bagdasarian, Z., Bai, M., Barion, L., Berz, M., Chekmenev, S., Ciullo, G., Dymov, S., Eversmann, D., Gaisser, M., Gebel, R., Grigoryev, K., Grzonka, D., Guidoboni, G., Heberling, D., Hetzel, J., Hinder, F., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Mchedlishvili, D., Mey, S., Mueller, F., Nass, A., Nikolaev, N. N., Nioradze, M., Pesce, A., Prasuhn, D., Rathmann, F., Rosenthal, M., Saleev, A., Schmidt, V., Semertzidis, Y., Senichev, Y., Shmakova, V., Silenko, A., Slim, J., Stahl, A., Stassen, R., Stephenson, E., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Talman, R., Thörngren Engblom, Pia, Trinkel, F., Uzikov, Yu., Valdau, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wronska, A., Wuestner, P., Zupranski, P., Zurek, M., Hempelmann, N., Hejny, V., Pretz, J., Soltner, H., Augustyniak, W., Bagdasarian, Z., Bai, M., Barion, L., Berz, M., Chekmenev, S., Ciullo, G., Dymov, S., Eversmann, D., Gaisser, M., Gebel, R., Grigoryev, K., Grzonka, D., Guidoboni, G., Heberling, D., Hetzel, J., Hinder, F., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Mchedlishvili, D., Mey, S., Mueller, F., Nass, A., Nikolaev, N. N., Nioradze, M., Pesce, A., Prasuhn, D., Rathmann, F., Rosenthal, M., Saleev, A., Schmidt, V., Semertzidis, Y., Senichev, Y., Shmakova, V., Silenko, A., Slim, J., Stahl, A., Stassen, R., Stephenson, E., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Talman, R., Thörngren Engblom, Pia, Trinkel, F., Uzikov, Yu., Valdau, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wronska, A., Wuestner, P., Zupranski, P., and Zurek, M.
Abstract: This paper reports the first simultaneous measurement of the horizontal and vertical components of the polarization vector in a storage ring under the influence of a radio frequency (rf) solenoid. The experiments were performed at the Cooler Synchrotron COSY in Julich using a vector polarized, bunched 0.97 GeV/c deuteron beam. Using the new spin feedback system, we set the initial phase difference between the solenoid field and the precession of the polarization vector to a predefined value. The feedback system was then switched off, allowing the phase difference to change over time, and the solenoid was switched on to rotate the polarization vector. We observed an oscillation of the vertical polarization component and the phase difference. The oscillations can be described using an analytical model. The results of this experiment also apply to other rf devices with horizontal magnetic fields, such as Wien filters. The precise manipulation of particle spins in storage rings is a prerequisite for measuring the electric dipole moment (EDM) of charged particles., QC 20180504
Published: 2018
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8. Connection between zero chromaticity and long in-plane polarization lifetime in a magnetic storage ring

Author: Guidoboni, G., Stephenson, E. J., Wronska, A., Bagdasarian, Z., Bsaisou, J., Chekmenev, S., Ciullo, G., Dymov, S., Eversmann, D., Gaisser, M., Gebel, R., Hejny, V., Hempelmann, N., Hinder, F., Kacharava, A., Keshelashvili, I., Kulessa, P., Lenisa, P., Lehrach, A., Lorentz, B., Maanen, P., Maier, R., Mchedlishvili, D., Mey, S., Nass, A., Pesce, A., Orlov, Y., Pretz, J., Prasuhn, D., Rathmann, F., Rosenthal, M., Saleev, A., Semertzidis, Y. K., Senichev, Y., Shmakova, V., Stockhorst, H., Stroeher, H., Talman, R., Thörngren Engblom, Pia, Trinkel, F., Valdau, Yu., Weidemann, C., Wuestner, P., Zurek, M., Zyuzin, D., Guidoboni, G., Stephenson, E. J., Wronska, A., Bagdasarian, Z., Bsaisou, J., Chekmenev, S., Ciullo, G., Dymov, S., Eversmann, D., Gaisser, M., Gebel, R., Hejny, V., Hempelmann, N., Hinder, F., Kacharava, A., Keshelashvili, I., Kulessa, P., Lenisa, P., Lehrach, A., Lorentz, B., Maanen, P., Maier, R., Mchedlishvili, D., Mey, S., Nass, A., Pesce, A., Orlov, Y., Pretz, J., Prasuhn, D., Rathmann, F., Rosenthal, M., Saleev, A., Semertzidis, Y. K., Senichev, Y., Shmakova, V., Stockhorst, H., Stroeher, H., Talman, R., Thörngren Engblom, Pia, Trinkel, F., Valdau, Yu., Weidemann, C., Wuestner, P., Zurek, M., and Zyuzin, D.
Abstract: In this paper, we demonstrate the connection between a magnetic storage ring with additional sextupole fields set so that the x and y chromaticities vanish and the maximizing of the lifetime of in-plane polarization (IPP) for a 0.97-GeV/c deuteron beam. The IPP magnitude was measured by continuously monitoring the down-up scattering asymmetry (sensitive to sideways polarization) in an in-beam, carbontarget polarimeter and unfolding the precession of the IPP due to the magnetic anomaly of the deuteron. The optimum operating conditions for a long IPP lifetime were made by scanning the field of the storage ring sextupole magnet families while observing the rate of IPP loss during storage of the beam. The beam was bunched and electron cooled. The IPP losses appear to arise from the change of the orbit circumference, and consequently the particle speed and spin tune, due to the transverse betatron oscillations of individual particles in the beam. The effects of these changes are canceled by an appropriate sextupole field setting., QC 20180222
Published: 2018
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9. Feasibility Study for an EDM Storage Ring

Author: Abusaif, F., Aggarwal, A., Aksentev, A., Alberdi-Esuain, B., Barion, L., Basile, S., Berz, M., Beyß, M., Böhme, C., Böker, J., Borburgh, J., Carli, C., Ciepał, I., Ciullo, G., Contalbrigo, M., De Conto, J. -M., Dymov, S., Engels, R., Felden, O., Gagoshidze, M., Gaisser, M., Gebel, R., Giese, N., Grigoryev, K., Grzonka, D., Hanraths, T., Hanhart, C., Heberling, D., Hejny, V., Hetzel, J., Hölscher, D., Javakhishvili, O., Kacharava, A., Karanth, S., Käseberg, C., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Laihem, K., Lamont, M., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Magiera, A., Maier, R., Makino, K., Martin, S., Mchedlishvili, D., Meißner, U. -G., Metreveli, Z., Michaud, J., Müller, F., Nass, A., Natour, G., Nikolaev, N., Nogga, A., Pesce, A., Poncza, V., Prasuhn, D., Pretz, J., Rathmann, F., Ritman, J., Rosenthal, M., Saleev, A., Schott, M., Sefzick, T., Senichev, Y., Shergelashvili, D., Shmakova, V., Siddique, S., Silenko, A., Simon, M., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stephenson, E., Straatmann, H., Ströher, H., Tabidze, M., Tagliente, G., Tahar, M., Talman, R., Uzikov, Yu., Valdau, Yu., Valetov, E., Wagner, T., Weidemann, C., Wilkin, C., Wirzba, A., Wrońska, A., Wüstner, P., Abusaif, F., Aggarwal, A., Aksentev, A., Alberdi-Esuain, B., Barion, L., Basile, S., Berz, M., Beyß, M., Böhme, C., Böker, J., Borburgh, J., Carli, C., Ciepał, I., Ciullo, G., Contalbrigo, M., De Conto, J. -M., Dymov, S., Engels, R., Felden, O., Gagoshidze, M., Gaisser, M., Gebel, R., Giese, N., Grigoryev, K., Grzonka, D., Hanraths, T., Hanhart, C., Heberling, D., Hejny, V., Hetzel, J., Hölscher, D., Javakhishvili, O., Kacharava, A., Karanth, S., Käseberg, C., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Laihem, K., Lamont, M., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Magiera, A., Maier, R., Makino, K., Martin, S., Mchedlishvili, D., Meißner, U. -G., Metreveli, Z., Michaud, J., Müller, F., Nass, A., Natour, G., Nikolaev, N., Nogga, A., Pesce, A., Poncza, V., Prasuhn, D., Pretz, J., Rathmann, F., Ritman, J., Rosenthal, M., Saleev, A., Schott, M., Sefzick, T., Senichev, Y., Shergelashvili, D., Shmakova, V., Siddique, S., Silenko, A., Simon, M., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stephenson, E., Straatmann, H., Ströher, H., Tabidze, M., Tagliente, G., Tahar, M., Talman, R., Uzikov, Yu., Valdau, Yu., Valetov, E., Wagner, T., Weidemann, C., Wilkin, C., Wirzba, A., Wrońska, A., and Wüstner, P.
Abstract: This project exploits charged particles confined as a storage ring beam (proton, deuteron, possibly $^3$He) to search for an intrinsic electric dipole moment (EDM, $\vec d$) aligned along the particle spin axis. Statistical sensitivities can approach $10^{-29}$~e$\cdot$cm. The challenge will be to reduce systematic errors to similar levels. The ring will be adjusted to preserve the spin polarization, initially parallel to the particle velocity, for times in excess of 15 minutes. Large radial electric fields, acting through the EDM, will rotate the polarization ($\vec d \times\vec E$). The slow rise in the vertical polarization component, detected through scattering from a target, signals the EDM. The project strategy is outlined. It foresees a step-wise plan, starting with ongoing COSY activities that demonstrate technical feasibility. Achievements to date include reduced polarization measurement errors, long horizontal-plane polarization lifetimes, and control of the polarization direction through feedback from the scattering measurements. The project continues with a proof-of-capability measurement (precursor experiment; first direct deuteron EDM measurement), an intermediate prototype ring (proof-of-principle; demonstrator for key technologies), and finally the high precision electric-field storage ring.
Published: 2018

10. Locking the Spin Precession in a Storage Ring

Author: Hempelmann, N., Hejny, V., Pretz, J., Stephenson, E., Augustyniak, W., Bagdasarian, Z., Bai, M., Barion, L., Berz, M., Chekmenev, S., Ciullo, G., Dymov, S., Etzkorn, F. -J, Eversmann, D., Gaisser, M., Gebel, R., Grigoryev, K., Grzonka, D., Guidoboni, G., Hanraths, T., Heberling, D., Hetzel, J., Hinder, F., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Mchedlishvili, D., Mey, S., Mueller, F., Nass, A., Nikolaev, N. N., Pesce, A., Prasuhn, D., Rathmann, F., Rosenthal, M., Saleev, A., Schmidt, V., Semertzidis, Y., Shmakova, V., Silenko, A., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Talman, R., Thörngren Engblom, Pia, Trinkel, F., Uzikov, Yu., Valdau, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wronska, A., Wuestner, P., Zupranski, P., Zurek, M., Hempelmann, N., Hejny, V., Pretz, J., Stephenson, E., Augustyniak, W., Bagdasarian, Z., Bai, M., Barion, L., Berz, M., Chekmenev, S., Ciullo, G., Dymov, S., Etzkorn, F. -J, Eversmann, D., Gaisser, M., Gebel, R., Grigoryev, K., Grzonka, D., Guidoboni, G., Hanraths, T., Heberling, D., Hetzel, J., Hinder, F., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Mchedlishvili, D., Mey, S., Mueller, F., Nass, A., Nikolaev, N. N., Pesce, A., Prasuhn, D., Rathmann, F., Rosenthal, M., Saleev, A., Schmidt, V., Semertzidis, Y., Shmakova, V., Silenko, A., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Talman, R., Thörngren Engblom, Pia, Trinkel, F., Uzikov, Yu., Valdau, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wronska, A., Wuestner, P., Zupranski, P., and Zurek, M.
Abstract: This Letter reports the successful use of feedback from a spin polarization measurement to the revolution frequency of a 0.97 GeV= c bunched and polarized deuteron beam in the Cooler Synchrotron (COSY) storage ring in order to control both the precession rate (approximate to 121 kHz) and the phase of the horizontal polarization component. Real time synchronization with a radio frequency (rf) solenoid made possible the rotation of the polarization out of the horizontal plane, yielding a demonstration of the feedback method to manipulate the polarization. In particular, the rotation rate shows a sinusoidal function of the horizontal polarization phase (relative to the rf solenoid), which was controlled to within a 1 standard deviation range of sigma= 0.21 rad. The minimum possible adjustment was 3.7 mHz out of a revolution frequency of 753 kHz, which changes the precession rate by 26 mrad/s. Such a capability meets a requirement for the use of storage rings to look for an intrinsic electric dipole moment of charged particles., QC 20170801
Published: 2017
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11. Spin tune mapping as a novel tool to probe the spin dynamics in storage rings

Author: Saleev, A., Nikolaev, N. N., Rathmann, F., Augustyniak, W., Bagdasarian, Z., Bai, M., Barion, L., Berz, M., Chekmenev, S., Ciullo, G., Dymov, S., Eversmann, D., Gaisser, M., Gebel, R., Grigoryev, K., Grzonka, D., Guidoboni, G., Heberling, D., Hejny, V., Hempelmann, N., Hetzel, J., Hinder, F., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Mchedlishvili, D., Mey, S., Mueller, F., Nass, A., Pesce, A., Prasuhn, D., Pretz, J., Rosenthal, M., Schmidt, V., Semertzidis, Y., Senichev, Y., Shmakova, V., Silenko, A., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stephenson, E., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Talman, R., Thörngren Engblom, Pia, Trinkel, F., Uzikov, Yu., Valdau, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wronska, A., Wuestner, P., Zupranski, P., Zurek, M., Saleev, A., Nikolaev, N. N., Rathmann, F., Augustyniak, W., Bagdasarian, Z., Bai, M., Barion, L., Berz, M., Chekmenev, S., Ciullo, G., Dymov, S., Eversmann, D., Gaisser, M., Gebel, R., Grigoryev, K., Grzonka, D., Guidoboni, G., Heberling, D., Hejny, V., Hempelmann, N., Hetzel, J., Hinder, F., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Koop, I., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Mchedlishvili, D., Mey, S., Mueller, F., Nass, A., Pesce, A., Prasuhn, D., Pretz, J., Rosenthal, M., Schmidt, V., Semertzidis, Y., Senichev, Y., Shmakova, V., Silenko, A., Slim, J., Soltner, H., Stahl, A., Stassen, R., Stephenson, E., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Talman, R., Thörngren Engblom, Pia, Trinkel, F., Uzikov, Yu., Valdau, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wronska, A., Wuestner, P., Zupranski, P., and Zurek, M.
Abstract: Precision experiments, such as the search for electric dipole moments of charged particles using storage rings, demand for an understanding of the spin dynamics with unprecedented accuracy. The ultimate aim is to measure the electric dipole moments with a sensitivity up to 15 orders in magnitude better than the magnetic dipole moment of the stored particles. This formidable task requires an understanding of the background to the signal of the electric dipole from rotations of the spins in the spurious magnetic fields of a storage ring. One of the observables, especially sensitive to the imperfection magnetic fields in the ring is the angular orientation of stable spin axis. Up to now, the stable spin axis has never been determined experimentally, and in addition, the JEDI collaboration for the first time succeeded to quantify the background signals that stem from false rotations of the magnetic dipole moments in the horizontal and longitudinal imperfection magnetic fields of the storage ring. To this end, we developed a new method based on the spin tune response of a machine to artificially applied longitudinal magnetic fields. This novel technique, called spin tune mapping, emerges as a very powerful tool to probe the spin dynamics in storage rings. The technique was experimentally tested in 2014 using polarized deuterons stored in the cooler synchrotron COSY, and for the first time, the angular orientation of the stable spin axis at two different locations in the ring has been determined to an unprecedented accuracy of better than 2.8 mu rad., QC 20170801
Published: 2017
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12. How to Reach a Thousand-Second in-Plane Polarization Lifetime with 0.97-GeV/c Deuterons in a Storage Ring

Author: Guidoboni, G., Stephenson, E., Andrianov, S., Augustyniak, W., Bagdasarian, Z., Bai, M., Baylac, M., Bernreuther, W., Bertelli, S., Berz, M., Boeker, J., Boehme, C., Bsaisou, J., Chekmenev, S., Chiladze, D., Ciullo, G., Contalbrigo, M., de Conto, J. -M, Dymov, S., Engels, R., Esser, F. M., Eversmann, D., Felden, O., Gaisser, M., Gebel, R., Glueckler, H., Goldenbaum, F., Grigoryev, K., Grzonka, D., Hahnraths, T., Heberling, D., Hejny, V., Hempelmann, N., Hetze, J., Hinder, F., Hipple, R., Hoelscher, D., Ivanov, A., Kacharava, A., Kamerdzhiev, V., Kamys, B., Keshelashvili, I., Khoukaz, A., Koop, I., Krause, H. -J, Krewald, S., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., macharashvili, G., Magiera, A., Maier, R., Iviakino, K., Marianski, B., Mchedlishvili, D., Meissner, Ulf-G., Mey, S., Morse, W., Mueller, F., Nass, A., Natour, G., Nikolaev, N., Nioradze, M., Nowakowski, K., Orlov, Y., Pesce, A., Prasuhn, D., Pretz, J., Rathmann, F., Ritman, J., Rosenthal, M., Rudy, Z., Saleev, A., Sefzick, T., Senriertzidis, Y., Senichev, Y., Shmakova, V., Silenko, A., Simon, M., Slim, J., Soltner, H., Stah, A., Stassen, R., Statera, M., Stockhorst, H., Straatmann, H., Stroeher, H., Tabidze, M., Talman, R., Engblom Thorngren, Pia, Trinke, F., Trzcinski, A., Uzikov, Yu., Valdati, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wilkin, C., Wronska, A., Wuestner, P., Zakrzewska, M., Zupranski, P., Zyuzin, D., Guidoboni, G., Stephenson, E., Andrianov, S., Augustyniak, W., Bagdasarian, Z., Bai, M., Baylac, M., Bernreuther, W., Bertelli, S., Berz, M., Boeker, J., Boehme, C., Bsaisou, J., Chekmenev, S., Chiladze, D., Ciullo, G., Contalbrigo, M., de Conto, J. -M, Dymov, S., Engels, R., Esser, F. M., Eversmann, D., Felden, O., Gaisser, M., Gebel, R., Glueckler, H., Goldenbaum, F., Grigoryev, K., Grzonka, D., Hahnraths, T., Heberling, D., Hejny, V., Hempelmann, N., Hetze, J., Hinder, F., Hipple, R., Hoelscher, D., Ivanov, A., Kacharava, A., Kamerdzhiev, V., Kamys, B., Keshelashvili, I., Khoukaz, A., Koop, I., Krause, H. -J, Krewald, S., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., macharashvili, G., Magiera, A., Maier, R., Iviakino, K., Marianski, B., Mchedlishvili, D., Meissner, Ulf-G., Mey, S., Morse, W., Mueller, F., Nass, A., Natour, G., Nikolaev, N., Nioradze, M., Nowakowski, K., Orlov, Y., Pesce, A., Prasuhn, D., Pretz, J., Rathmann, F., Ritman, J., Rosenthal, M., Rudy, Z., Saleev, A., Sefzick, T., Senriertzidis, Y., Senichev, Y., Shmakova, V., Silenko, A., Simon, M., Slim, J., Soltner, H., Stah, A., Stassen, R., Statera, M., Stockhorst, H., Straatmann, H., Stroeher, H., Tabidze, M., Talman, R., Engblom Thorngren, Pia, Trinke, F., Trzcinski, A., Uzikov, Yu., Valdati, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wilkin, C., Wronska, A., Wuestner, P., Zakrzewska, M., Zupranski, P., and Zyuzin, D.
Abstract: We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of a magnetic storage ring (COSY). This long spin coherence time is maintained through a combination of beam bunching, electron cooling, sextupole field corrections, and the suppression of collective effects through beam current limits. This record lifetime is required for a storage ring search for an intrinsic electric dipole moment on the deuteron at a statistical sensitivity level approaching 10(-29) e cm., QC 20161005
Published: 2016
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13. New Method for a Continuous Determination of the Spin Tune in Storage Rings and Implications for Precision Experiments

Author: Eversmann, D., Hejny, V., Hinder, F., Kacharava, A., Pretz, J., Rathmann, F., Rosenthal, M., Trinkel, F., Andrianov, S., Augustyniak, W., Bagdasarian, Z., Bai, M., Bernreuther, W., Bertelli, S., Berz, M., Bsaisou, J., Chekmenev, S., Chiladze, D., Ciullo, G., Contalbrigo, M., de Vries, J., Dymov, S., Engels, R., Esser, F. M., Felden, O., Gaisser, M., Gebel, R., Glueckler, H., Goldenbaum, F., Grigoryev, K., Grzonka, D., Guidoboni, G., Hanhart, C., Heberling, D., Hempelmann, N., Hetzel, J., Hipple, R., Hoelscher, D., Ivanov, A., Kamerdzhiev, V., Kamys, B., Keshelashvili, I., Khoukaz, A., Koop, I., Krause, H-J, Krewald, S., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Maier, R., Makino, K., Marianski, B., Mchedlishvili, D., Meiner, Ulf-G., Mey, S., Nass, A., Natour, G., Nikolaev, N., Nioradze, M., Nogga, A., Nowakowski, K., Pesce, A., Prasuhn, D., Ritman, J., Rudy, Z., Saleev, A., Semertzidis, Y., Senichev, Y., Shmakova, V., Silenko, A., Slim, J., Soltner, H., Stahl, A., Stassen, R., Statera, M., Stephenson, E., Stockhorst, H., Straatmann, H., Stroeher, H., Tabidze, M., Talman, R., Engblom, Pia Thörngren, Trzcinski, A., Uzikov, Yu., Valdau, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wilkin, C., Wirzba, A., Wronska, A., Wuestner, P., Zakrzewska, M., Zupranski, P., Zyuzin, D., Eversmann, D., Hejny, V., Hinder, F., Kacharava, A., Pretz, J., Rathmann, F., Rosenthal, M., Trinkel, F., Andrianov, S., Augustyniak, W., Bagdasarian, Z., Bai, M., Bernreuther, W., Bertelli, S., Berz, M., Bsaisou, J., Chekmenev, S., Chiladze, D., Ciullo, G., Contalbrigo, M., de Vries, J., Dymov, S., Engels, R., Esser, F. M., Felden, O., Gaisser, M., Gebel, R., Glueckler, H., Goldenbaum, F., Grigoryev, K., Grzonka, D., Guidoboni, G., Hanhart, C., Heberling, D., Hempelmann, N., Hetzel, J., Hipple, R., Hoelscher, D., Ivanov, A., Kamerdzhiev, V., Kamys, B., Keshelashvili, I., Khoukaz, A., Koop, I., Krause, H-J, Krewald, S., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Maier, R., Makino, K., Marianski, B., Mchedlishvili, D., Meiner, Ulf-G., Mey, S., Nass, A., Natour, G., Nikolaev, N., Nioradze, M., Nogga, A., Nowakowski, K., Pesce, A., Prasuhn, D., Ritman, J., Rudy, Z., Saleev, A., Semertzidis, Y., Senichev, Y., Shmakova, V., Silenko, A., Slim, J., Soltner, H., Stahl, A., Stassen, R., Statera, M., Stephenson, E., Stockhorst, H., Straatmann, H., Stroeher, H., Tabidze, M., Talman, R., Engblom, Pia Thörngren, Trzcinski, A., Uzikov, Yu., Valdau, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wilkin, C., Wirzba, A., Wronska, A., Wuestner, P., Zakrzewska, M., Zupranski, P., and Zyuzin, D.
Abstract: A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, the spin tune-defined as the number of spin precessions per turn-is given by nu(s) = gamma G (gamma is the Lorentz factor, G the gyromagnetic anomaly). At 970 MeV/c, the deuteron spins coherently process at a frequency of approximate to 120 kHz in the Cooler Synchrotron COSY. The spin tune is deduced from the up-down asymmetry of deuteron-carbon scattering. In a time interval of 2.6 s, the spin tune was determined with a precision of the order 10(-8), and to 1 x 10(-10) for a continuous 100 s accelerator cycle. This renders the presented method a new precision tool for accelerator physics; controlling the spin motion of particles to high precision is mandatory, in particular, for the measurement of electric dipole moments of charged particles in a storage ring., QC 20140924
Published: 2015
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14. Analysing powers and spin correlations in deuteron–proton charge exchange at 726 MeV

Author: Dymov, S., Azaryan, T., Bagdasarian, Z., Barsov, S., Carbonell, J., Chiladze, D., Engels, R., Gebel, R., Grigoryev, K., Hartmann, M., Kacharava, A., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lomidze, N., Lorentz, B., Macharashvili, G., Mchedlishvili, D., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Shmakova, V., Stroeher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., Weidemann, C., Wilkin, C., Dymov, S., Azaryan, T., Bagdasarian, Z., Barsov, S., Carbonell, J., Chiladze, D., Engels, R., Gebel, R., Grigoryev, K., Hartmann, M., Kacharava, A., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lomidze, N., Lorentz, B., Macharashvili, G., Mchedlishvili, D., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Shmakova, V., Stroeher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., Weidemann, C., and Wilkin, C.
Abstract: The charge exchange of vector polarised deuterons on a polarised hydrogen target has been studied in a high statistics experiment at the COSY-ANKE facility at a deuteron beam energy of Td=726 MeV. By selecting two fast protons at low relative energy Epp, the measured analysing powers and spin correlations are sensitive to interference terms between specific neutron–proton charge-exchange amplitudes at a neutron kinetic energy of Tn≈1/2 Td=363 MeV. An impulse approximation calculation, which takes into account corrections due to the angular distribution in the diproton, describes reasonably the dependence of the data on both Epp and the momentum transfer. This lends broad support to the current neutron–proton partial wave solution that was used in the estimation.
Published: 2015

15. Study of the p\vec{d}→n{pp}s charge-exchange reaction using a polarised deuterium target

Author: Gou, B., Mchedlishvili, D., Bagdasarian, Z., Barsov, S., Garbonell, J., Chiladze, D., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Grigoryev, K., Hartmann, M., Kacharava, A., Khoukaz, A., Kulessa, P., Kulikov, A., Lehrach, A., Li, Z., Lomidze, N., Lorentz, B., Macharashvili, G., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Shmakova, V., Ströher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., Wang, T., Weidemann, C., Wilkin, C., Yuan, X., Gou, B., Mchedlishvili, D., Bagdasarian, Z., Barsov, S., Garbonell, J., Chiladze, D., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Grigoryev, K., Hartmann, M., Kacharava, A., Khoukaz, A., Kulessa, P., Kulikov, A., Lehrach, A., Li, Z., Lomidze, N., Lorentz, B., Macharashvili, G., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Shmakova, V., Ströher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., Wang, T., Weidemann, C., Wilkin, C., and Yuan, X.
Abstract: The vector and tensor analysing powers, Ayand Ayy, of the p d→n{pp}scharge-exchange reaction have been measured at a beam energy of 600MeV at the COSY-ANKE facility by using an unpolarised proton beam incident on an internal storage cell target filled with polarised deuterium gas. The low energy recoiling protons were measured in a pair of silicon tracking telescopes placed on either side of the target. Putting a cut of 3MeV on the diproton excitation energy ensured that the two protons were dominantly in the 1S0state, here denoted by {pp}s. The polarisation of the deuterium gas was established through measurements in parallel of proton–deuteron elastic scattering. By analysing events where both protons entered the same telescope, the charge-exchange reaction was measured for momentum transfers q ≥160MeV/c. These data provide a good continuation of the earlier results at q ≤140MeV/cobtained with a polarised deuteron beam. They are also consistent with impulse approximation predictions with little sign evident for any modifications due to multiple scatterings. These successful results confirm that the ANKE deuteron charge-exchange programme can be extended to much higher energies with a polarised deuterium target than can be achieved with a polarised deuteron beam.
Published: 2015

16. Absence of spin dependence in the final state interaction of the d(pol) p --> 3He eta reaction

Author: Papenbrock, M., Barsov, S., Burmeister, I., Chiladze, D., Dymov, S., Fritzsch, C., Gebel, R., Goslawski, P., Hartmann, M., Kacharava, A., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lorentz, B., Mchedlishvili, D., Mersmann, T., Merzliakov, S., Mielke, M., Mikirtychiants, S., Ohm, H., Prasuhn, D., Rathmann, F., Rausmann, T., Serdyuk, V., Ströher, H., Täschner, A., Trusov, S., Valdau, Y., Wilkin, C., Papenbrock, M., Barsov, S., Burmeister, I., Chiladze, D., Dymov, S., Fritzsch, C., Gebel, R., Goslawski, P., Hartmann, M., Kacharava, A., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lorentz, B., Mchedlishvili, D., Mersmann, T., Merzliakov, S., Mielke, M., Mikirtychiants, S., Ohm, H., Prasuhn, D., Rathmann, F., Rausmann, T., Serdyuk, V., Ströher, H., Täschner, A., Trusov, S., Valdau, Y., and Wilkin, C.
Abstract: The deuteron tensor analysing power t_{20} of the d(pol) p --> 3He eta reaction has been measured at the COSY-ANKE facility in small steps in excess energy Q up to Q = 11 MeV. Despite the square of the production amplitude varying by over a factor of five through this range, t_{20} shows little or no energy dependence. This is evidence that the final state interaction causing the energy variation is not influenced by the spin configuration in the entrance channel. The weak angular dependence observed for t_{20} provides useful insight into the amplitude structure near threshold.
Published: 2014

17. New experimental upper limit of the electron-proton spin-flip cross-section

Author: Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trzcinski, A., Valdau, Y., Vasiliev, A., Wuestner, P., Zupranski, P., Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trzcinski, A., Valdau, Y., Vasiliev, A., Wuestner, P., and Zupranski, P.
Abstract: In a previous publication, measurements of the depolarization of a stored proton beam by interaction with a co-propagating unpolarized electron beam at low relative energy have been presented and an upper limit of about 3 x 10(7) b for the electron-proton spin flip cross-section was determined. A refined analysis presented in this paper reduces the previous upper limit by a factor of three by the introduction of a new procedure that, also makes use of non-identified particles., QC 20140806
Published: 2014
Full Text: View/download PDF

18. New experimental upper limit of the electron-proton spin-flip cross-section

Author: Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trzcinski, A., Valdau, Y., Vasiliev, A., Wuestner, P., Zupranski, P., Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trzcinski, A., Valdau, Y., Vasiliev, A., Wuestner, P., and Zupranski, P.
Abstract: In a previous publication, measurements of the depolarization of a stored proton beam by interaction with a co-propagating unpolarized electron beam at low relative energy have been presented and an upper limit of about 3 x 10(7) b for the electron-proton spin flip cross-section was determined. A refined analysis presented in this paper reduces the previous upper limit by a factor of three by the introduction of a new procedure that, also makes use of non-identified particles., QC 20140806
Published: 2014
Full Text: View/download PDF

19. New experimental upper limit of the electron-proton spin-flip cross-section

Author: Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trzcinski, A., Valdau, Y., Vasiliev, A., Wuestner, P., Zupranski, P., Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trzcinski, A., Valdau, Y., Vasiliev, A., Wuestner, P., and Zupranski, P.
Abstract: In a previous publication, measurements of the depolarization of a stored proton beam by interaction with a co-propagating unpolarized electron beam at low relative energy have been presented and an upper limit of about 3 x 10(7) b for the electron-proton spin flip cross-section was determined. A refined analysis presented in this paper reduces the previous upper limit by a factor of three by the introduction of a new procedure that, also makes use of non-identified particles., QC 20140806
Published: 2014
Full Text: View/download PDF

20. Absence of spin dependence in the final state interaction of the d(pol) p --> 3He eta reaction

Author: Papenbrock, M., Barsov, S., Burmeister, I., Chiladze, D., Dymov, S., Fritzsch, C., Gebel, R., Goslawski, P., Hartmann, M., Kacharava, A., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lorentz, B., Mchedlishvili, D., Mersmann, T., Merzliakov, S., Mielke, M., Mikirtychiants, S., Ohm, H., Prasuhn, D., Rathmann, F., Rausmann, T., Serdyuk, V., Ströher, H., Täschner, A., Trusov, S., Valdau, Y., Wilkin, C., Papenbrock, M., Barsov, S., Burmeister, I., Chiladze, D., Dymov, S., Fritzsch, C., Gebel, R., Goslawski, P., Hartmann, M., Kacharava, A., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lorentz, B., Mchedlishvili, D., Mersmann, T., Merzliakov, S., Mielke, M., Mikirtychiants, S., Ohm, H., Prasuhn, D., Rathmann, F., Rausmann, T., Serdyuk, V., Ströher, H., Täschner, A., Trusov, S., Valdau, Y., and Wilkin, C.
Abstract: The deuteron tensor analysing power t_{20} of the d(pol) p --> 3He eta reaction has been measured at the COSY-ANKE facility in small steps in excess energy Q up to Q = 11 MeV. Despite the square of the production amplitude varying by over a factor of five through this range, t_{20} shows little or no energy dependence. This is evidence that the final state interaction causing the energy variation is not influenced by the spin configuration in the entrance channel. The weak angular dependence observed for t_{20} provides useful insight into the amplitude structure near threshold.
Published: 2014

21. New experimental upper limit of the electron-proton spin-flip cross-section

Author: Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, P., Trzcinski, A., Valdau, Y., Vasiliev, A., Wüstner, P., Zupranski, P., Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, P., Trzcinski, A., Valdau, Y., Vasiliev, A., Wüstner, P., and Zupranski, P.
Abstract: In a previous publication, measurements of the depolarization of a stored proton beam by interaction with a co-propagating unpolarized electron beam at low relative energy have been presented and an upper limit of about 3 ×107 b for the electron-proton spin-flip cross-section was determined. A refined analysis presented in this paper reduces the previous upper limit by a factor of three by the introduction of a new procedure that also makes use of non-identified particles.
Published: 2014

22. Absence of spin dependence in the final state interaction of the d(pol) p --> 3He eta reaction

Author: Papenbrock, M., Barsov, S., Burmeister, I., Chiladze, D., Dymov, S., Fritzsch, C., Gebel, R., Goslawski, P., Hartmann, M., Kacharava, A., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lorentz, B., Mchedlishvili, D., Mersmann, T., Merzliakov, S., Mielke, M., Mikirtychiants, S., Ohm, H., Prasuhn, D., Rathmann, F., Rausmann, T., Serdyuk, V., Ströher, H., Täschner, A., Trusov, S., Valdau, Y., Wilkin, C., Papenbrock, M., Barsov, S., Burmeister, I., Chiladze, D., Dymov, S., Fritzsch, C., Gebel, R., Goslawski, P., Hartmann, M., Kacharava, A., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lorentz, B., Mchedlishvili, D., Mersmann, T., Merzliakov, S., Mielke, M., Mikirtychiants, S., Ohm, H., Prasuhn, D., Rathmann, F., Rausmann, T., Serdyuk, V., Ströher, H., Täschner, A., Trusov, S., Valdau, Y., and Wilkin, C.
Abstract: The deuteron tensor analysing power t_{20} of the d(pol) p --> 3He eta reaction has been measured at the COSY-ANKE facility in small steps in excess energy Q up to Q = 11 MeV. Despite the square of the production amplitude varying by over a factor of five through this range, t_{20} shows little or no energy dependence. This is evidence that the final state interaction causing the energy variation is not influenced by the spin configuration in the entrance channel. The weak angular dependence observed for t_{20} provides useful insight into the amplitude structure near threshold.
Published: 2014

23. Measurement of the analysing power in proton-proton elastic scattering at small angles

Author: Bagdasarian, Z., Chiladze, D., Dymov, S., Kacharava, A., Macharashvili, G., Barsov, S., Gebel, R., Gou, B., Hartmann, M., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Maier, R., Mchedlishvili, D., Merzliakov, S., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Shmakova, V., Stassen, R., Stockhorst, H., Strakovsky, I. I., Ströher, H., Tabidze, M., Täschner, A., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., Wilkin, C., Workman, R. L., Bagdasarian, Z., Chiladze, D., Dymov, S., Kacharava, A., Macharashvili, G., Barsov, S., Gebel, R., Gou, B., Hartmann, M., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Maier, R., Mchedlishvili, D., Merzliakov, S., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Shmakova, V., Stassen, R., Stockhorst, H., Strakovsky, I. I., Ströher, H., Tabidze, M., Täschner, A., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., Wilkin, C., and Workman, R. L.
Abstract: The proton analysing power in p→p elastic scattering has been measured at small angles at COSY-ANKE at 796 MeV and five other beam energies between 1.6 and 2.4 GeV using a polarised proton beam. The asymmetries obtained by detecting the fast proton in the ANKE forward detector or the slow recoil proton in a silicon tracking telescope are completely consistent. Although the analysing power results agree well with the many published data at 796 MeV, and also with the most recent partial wave solution at this energy, the ANKE data at the higher energies lie well above the predictions of this solution at small angles. An updated phase shift analysis that uses the ANKE results together with the World data leads to a much better description of these new measurements.
Published: 2014

24. New experimental upper limit of the electron-proton spin-flip cross-section

Author: Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trzcinski, A., Valdau, Y., Vasiliev, A., Wuestner, P., Zupranski, P., Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trzcinski, A., Valdau, Y., Vasiliev, A., Wuestner, P., and Zupranski, P.
Abstract: In a previous publication, measurements of the depolarization of a stored proton beam by interaction with a co-propagating unpolarized electron beam at low relative energy have been presented and an upper limit of about 3 x 10(7) b for the electron-proton spin flip cross-section was determined. A refined analysis presented in this paper reduces the previous upper limit by a factor of three by the introduction of a new procedure that, also makes use of non-identified particles., QC 20140806
Published: 2014
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25. New experimental upper limit of the electron-proton spin-flip cross-section

Author: Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trzcinski, A., Valdau, Y., Vasiliev, A., Wuestner, P., Zupranski, P., Oellers, D., Weidemann, C., Lenisa, P., Meyer, H. O., Rathmann, F., Trusov, S., Augustyniak, W., Bagdasarian, Z., Barion, L., Barsov, S., Bechstedt, U., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Gaisser, M., Gebel, R., Goslawski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nikolaev, N., Nioradze, M., Papenbrock, M., Pappalardo, L., Pesce, A., Prasuhn, D., Sarkadi, J., Schleichert, R., Smirnov, A., Seyfarth, H., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Stroeher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trzcinski, A., Valdau, Y., Vasiliev, A., Wuestner, P., and Zupranski, P.
Abstract: In a previous publication, measurements of the depolarization of a stored proton beam by interaction with a co-propagating unpolarized electron beam at low relative energy have been presented and an upper limit of about 3 x 10(7) b for the electron-proton spin flip cross-section was determined. A refined analysis presented in this paper reduces the previous upper limit by a factor of three by the introduction of a new procedure that, also makes use of non-identified particles., QC 20140806
Published: 2014
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26. Absence of spin dependence in the final state interaction of the d(pol) p --> 3He eta reaction

Author: Papenbrock, M., Barsov, S., Burmeister, I., Chiladze, D., Dymov, S., Fritzsch, C., Gebel, R., Goslawski, P., Hartmann, M., Kacharava, A., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lorentz, B., Mchedlishvili, D., Mersmann, T., Merzliakov, S., Mielke, M., Mikirtychiants, S., Ohm, H., Prasuhn, D., Rathmann, F., Rausmann, T., Serdyuk, V., Ströher, H., Täschner, A., Trusov, S., Valdau, Y., Wilkin, C., Papenbrock, M., Barsov, S., Burmeister, I., Chiladze, D., Dymov, S., Fritzsch, C., Gebel, R., Goslawski, P., Hartmann, M., Kacharava, A., Keshelashvili, I., Khoukaz, A., Kulessa, P., Kulikov, A., Lorentz, B., Mchedlishvili, D., Mersmann, T., Merzliakov, S., Mielke, M., Mikirtychiants, S., Ohm, H., Prasuhn, D., Rathmann, F., Rausmann, T., Serdyuk, V., Ströher, H., Täschner, A., Trusov, S., Valdau, Y., and Wilkin, C.
Abstract: The deuteron tensor analysing power t_{20} of the d(pol) p --> 3He eta reaction has been measured at the COSY-ANKE facility in small steps in excess energy Q up to Q = 11 MeV. Despite the square of the production amplitude varying by over a factor of five through this range, t_{20} shows little or no energy dependence. This is evidence that the final state interaction causing the energy variation is not influenced by the spin configuration in the entrance channel. The weak angular dependence observed for t_{20} provides useful insight into the amplitude structure near threshold.
Published: 2014

27. Excitation of the Delta(1232) isobar in deuteron charge exchange on hydrogen at 1.6, 1.8, and 2.3 GeV

Author: Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Imambekov, O., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H. J., Steffens, E., Stockhorst, H., Ströher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., Wilkin, C., Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Imambekov, O., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H. J., Steffens, E., Stockhorst, H., Ströher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: The charge-exchange break-up of polarised deuterons pol{d}p -> {pp}n, where the final {pp} diproton system has a very low excitation energy and hence is mainly in the 1S0 state, is a powerful tool to probe the spin-flip terms in the proton-neutron charge-exchange scattering. Recent measurements with the ANKE spectrometer at the COSY storage ring at 1.6, 1.8, and 2.27 GeV have extended these studies into the pion-production regime in order to investigate the mechanism for the excitation of the Delta(1232) isobar in the pol{d}p -> {pp}X reaction. Values of the differential cross section and two deuteron tensor analysing powers, A_{xx} and A_{yy}, have been extracted in terms of the momentum transfer to the diproton or the invariant mass Mx of the unobserved system X. The unpolarised cross section in the high Mx region is well described in a model that includes only direct excitation of the Delta isobar through undistorted one pion exchange. However, the cross section is grossly underestimated for low Mx, even when Delta excitation in the projectile deuteron is included in the calculation. Furthermore, direct Delta production through one pion exchange only reproduces the angular dependence of the difference between the two tensor analysing powers.
Published: 2013

28. First measurements of spin correlations in the np -> d pi0 reaction

Author: Shmakova, V., Mchedlishvili, D., Dymov, S., Azaryan, T., Barsov, S., Chiladze, D., Engels, R., Gebel, R., Gou, B., Grigoryev, K., Hartmann, M., Kacharava, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lomidze, N., Lorentz, B., Macharashvili, G., Merzliakov, S., Mikirtytchiants, M., Mikirtytchiants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Ströher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., Wilkin, C., Shmakova, V., Mchedlishvili, D., Dymov, S., Azaryan, T., Barsov, S., Chiladze, D., Engels, R., Gebel, R., Gou, B., Grigoryev, K., Hartmann, M., Kacharava, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lomidze, N., Lorentz, B., Macharashvili, G., Merzliakov, S., Mikirtytchiants, M., Mikirtytchiants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Ströher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: The transverse spin correlations Axx and Ayy in the np-> d pi^0 reaction have been measured for the first time in quasi-free kinematics at the COSY-ANKE facility using a polarised deuteron beam incident on a polarised hydrogen cell target. The results obtained for neutron energies close to 353 MeV and 600 MeV are in good agreement with the partial wave analysis of data on the isospin-related pp-> d pi^+ reaction, though the present results cover also the small-angle region, which was largely absent from these data.
Published: 2013

29. Excitation of the Delta(1232) isobar in deuteron charge exchange on hydrogen at 1.6, 1.8, and 2.3 GeV

Author: Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Imambekov, O., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H. J., Steffens, E., Stockhorst, H., Ströher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., Wilkin, C., Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Imambekov, O., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H. J., Steffens, E., Stockhorst, H., Ströher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: The charge-exchange break-up of polarised deuterons pol{d}p -> {pp}n, where the final {pp} diproton system has a very low excitation energy and hence is mainly in the 1S0 state, is a powerful tool to probe the spin-flip terms in the proton-neutron charge-exchange scattering. Recent measurements with the ANKE spectrometer at the COSY storage ring at 1.6, 1.8, and 2.27 GeV have extended these studies into the pion-production regime in order to investigate the mechanism for the excitation of the Delta(1232) isobar in the pol{d}p -> {pp}X reaction. Values of the differential cross section and two deuteron tensor analysing powers, A_{xx} and A_{yy}, have been extracted in terms of the momentum transfer to the diproton or the invariant mass Mx of the unobserved system X. The unpolarised cross section in the high Mx region is well described in a model that includes only direct excitation of the Delta isobar through undistorted one pion exchange. However, the cross section is grossly underestimated for low Mx, even when Delta excitation in the projectile deuteron is included in the calculation. Furthermore, direct Delta production through one pion exchange only reproduces the angular dependence of the difference between the two tensor analysing powers.
Published: 2013

30. First measurements of spin correlations in the np -> d pi0 reaction

Author: Shmakova, V., Mchedlishvili, D., Dymov, S., Azaryan, T., Barsov, S., Chiladze, D., Engels, R., Gebel, R., Gou, B., Grigoryev, K., Hartmann, M., Kacharava, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lomidze, N., Lorentz, B., Macharashvili, G., Merzliakov, S., Mikirtytchiants, M., Mikirtytchiants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Ströher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., Wilkin, C., Shmakova, V., Mchedlishvili, D., Dymov, S., Azaryan, T., Barsov, S., Chiladze, D., Engels, R., Gebel, R., Gou, B., Grigoryev, K., Hartmann, M., Kacharava, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lomidze, N., Lorentz, B., Macharashvili, G., Merzliakov, S., Mikirtytchiants, M., Mikirtytchiants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Ströher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: The transverse spin correlations Axx and Ayy in the np-> d pi^0 reaction have been measured for the first time in quasi-free kinematics at the COSY-ANKE facility using a polarised deuteron beam incident on a polarised hydrogen cell target. The results obtained for neutron energies close to 353 MeV and 600 MeV are in good agreement with the partial wave analysis of data on the isospin-related pp-> d pi^+ reaction, though the present results cover also the small-angle region, which was largely absent from these data.
Published: 2013

31. Excitation of the Delta(1232) isobar in deuteron charge exchange on hydrogen at 1.6, 1.8, and 2.3 GeV

Author: Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Imambekov, O., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H. J., Steffens, E., Stockhorst, H., Ströher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., Wilkin, C., Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Imambekov, O., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H. J., Steffens, E., Stockhorst, H., Ströher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: The charge-exchange break-up of polarised deuterons pol{d}p -> {pp}n, where the final {pp} diproton system has a very low excitation energy and hence is mainly in the 1S0 state, is a powerful tool to probe the spin-flip terms in the proton-neutron charge-exchange scattering. Recent measurements with the ANKE spectrometer at the COSY storage ring at 1.6, 1.8, and 2.27 GeV have extended these studies into the pion-production regime in order to investigate the mechanism for the excitation of the Delta(1232) isobar in the pol{d}p -> {pp}X reaction. Values of the differential cross section and two deuteron tensor analysing powers, A_{xx} and A_{yy}, have been extracted in terms of the momentum transfer to the diproton or the invariant mass Mx of the unobserved system X. The unpolarised cross section in the high Mx region is well described in a model that includes only direct excitation of the Delta isobar through undistorted one pion exchange. However, the cross section is grossly underestimated for low Mx, even when Delta excitation in the projectile deuteron is included in the calculation. Furthermore, direct Delta production through one pion exchange only reproduces the angular dependence of the difference between the two tensor analysing powers.
Published: 2013

32. The neutron-proton charge-exchange amplitudes measured in the dp -> ppn reaction

Author: Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H., Steffens, E., Stockhorst, H., Stroher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., Wilkin, C., Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H., Steffens, E., Stockhorst, H., Stroher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: The unpolarised differential cross section and the two deuteron tensor analysing powers A(xx) and A(yy) of the (d) over right arrowp -> {pp}(s)n charge-exchange reaction have been measured with the ANKE spectrometer at the COSY storage ring. Using deuteron beams with energies 1.2, 1.6, 1.8, and 2.27 GeV, data were obtained for small momentum transfers to a {pp}(s) system with low excitation energy. The results at the three lower energies are consistent with impulse approximation predictions based upon the current knowledge of the neutron-proton amplitudes. However, at 2.27 GeV, where these amplitudes are far more uncertain, agreement requires a reduction in the overall double-spin-flip contribution, with an especially significant effect in the longitudinal direction. These conclusions are supported by measurements of the deuteron-proton spin-correlation parameters C-x,C-x and C-y,C-y that were carried out in the (d) over right arrow(p) over right arrow -> {pp}(s)n reaction at 1.2 and 2.27 GeV. The values obtained for the proton analysing power A(y)(p) also suggest the need for a radical re-evaluation of the neutron-proton elastic scattering amplitudes at the higher energy. It is therefore clear that such measurements can provide a valuable addition to the neutron-proton database in the charge-exchange region.
Published: 2013

33. First measurements of spin correlations in the np -> d pi0 reaction

Author: Shmakova, V., Mchedlishvili, D., Dymov, S., Azaryan, T., Barsov, S., Chiladze, D., Engels, R., Gebel, R., Gou, B., Grigoryev, K., Hartmann, M., Kacharava, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lomidze, N., Lorentz, B., Macharashvili, G., Merzliakov, S., Mikirtytchiants, M., Mikirtytchiants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Ströher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., Wilkin, C., Shmakova, V., Mchedlishvili, D., Dymov, S., Azaryan, T., Barsov, S., Chiladze, D., Engels, R., Gebel, R., Gou, B., Grigoryev, K., Hartmann, M., Kacharava, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lomidze, N., Lorentz, B., Macharashvili, G., Merzliakov, S., Mikirtytchiants, M., Mikirtytchiants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Ströher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: The transverse spin correlations Axx and Ayy in the np-> d pi^0 reaction have been measured for the first time in quasi-free kinematics at the COSY-ANKE facility using a polarised deuteron beam incident on a polarised hydrogen cell target. The results obtained for neutron energies close to 353 MeV and 600 MeV are in good agreement with the partial wave analysis of data on the isospin-related pp-> d pi^+ reaction, though the present results cover also the small-angle region, which was largely absent from these data.
Published: 2013

34. Excitation of the Delta(1232) isobar in deuteron charge exchange on hydrogen at 1.6, 1.8, and 2.3 GeV

Author: Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Imambekov, O., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H. J., Steffens, E., Stockhorst, H., Ströher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., Wilkin, C., Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Imambekov, O., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H. J., Steffens, E., Stockhorst, H., Ströher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: The charge-exchange break-up of polarised deuterons pol{d}p -> {pp}n, where the final {pp} diproton system has a very low excitation energy and hence is mainly in the 1S0 state, is a powerful tool to probe the spin-flip terms in the proton-neutron charge-exchange scattering. Recent measurements with the ANKE spectrometer at the COSY storage ring at 1.6, 1.8, and 2.27 GeV have extended these studies into the pion-production regime in order to investigate the mechanism for the excitation of the Delta(1232) isobar in the pol{d}p -> {pp}X reaction. Values of the differential cross section and two deuteron tensor analysing powers, A_{xx} and A_{yy}, have been extracted in terms of the momentum transfer to the diproton or the invariant mass Mx of the unobserved system X. The unpolarised cross section in the high Mx region is well described in a model that includes only direct excitation of the Delta isobar through undistorted one pion exchange. However, the cross section is grossly underestimated for low Mx, even when Delta excitation in the projectile deuteron is included in the calculation. Furthermore, direct Delta production through one pion exchange only reproduces the angular dependence of the difference between the two tensor analysing powers.
Published: 2013

35. First measurements of spin correlations in the np -> d pi0 reaction

Author: Shmakova, V., Mchedlishvili, D., Dymov, S., Azaryan, T., Barsov, S., Chiladze, D., Engels, R., Gebel, R., Gou, B., Grigoryev, K., Hartmann, M., Kacharava, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lomidze, N., Lorentz, B., Macharashvili, G., Merzliakov, S., Mikirtytchiants, M., Mikirtytchiants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Ströher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., Wilkin, C., Shmakova, V., Mchedlishvili, D., Dymov, S., Azaryan, T., Barsov, S., Chiladze, D., Engels, R., Gebel, R., Gou, B., Grigoryev, K., Hartmann, M., Kacharava, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lomidze, N., Lorentz, B., Macharashvili, G., Merzliakov, S., Mikirtytchiants, M., Mikirtytchiants, S., Nioradze, M., Ohm, H., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Ströher, H., Tabidze, M., Trusov, S., Tsirkov, D., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: The transverse spin correlations Axx and Ayy in the np-> d pi^0 reaction have been measured for the first time in quasi-free kinematics at the COSY-ANKE facility using a polarised deuteron beam incident on a polarised hydrogen cell target. The results obtained for neutron energies close to 353 MeV and 600 MeV are in good agreement with the partial wave analysis of data on the isospin-related pp-> d pi^+ reaction, though the present results cover also the small-angle region, which was largely absent from these data.
Published: 2013

36. Momentum dependence of the phi-meson nuclear transparency

Author: Hartmann, M., Kiselev, Y. T., Polyanskiy, A., Paryev, E. Y., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gebel, R., Hejny, V., Kaempfer, B., Keshelashvili, I., Koptev, V., Lorentz, B., Maeda, Y., Magas, V. K., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Roca, L., Schade, H., Serdyuk, V., Sibirtsev, A., Sinitsyna, V. Y., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Y., Wilkin, C., Wuestner, P., Ye, Q. J., Hartmann, M., Kiselev, Y. T., Polyanskiy, A., Paryev, E. Y., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gebel, R., Hejny, V., Kaempfer, B., Keshelashvili, I., Koptev, V., Lorentz, B., Maeda, Y., Magas, V. K., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Roca, L., Schade, H., Serdyuk, V., Sibirtsev, A., Sinitsyna, V. Y., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Y., Wilkin, C., Wuestner, P., and Ye, Q. J.
Abstract: The production of phi mesons in proton collisions with C, Cu, Ag, and Au targets has been studied via the phi -> K+K- decay at an incident beam energy of 2.83 GeV using the ANKE detector system at COSY. For the first time, the momentum dependence of the nuclear transparency ratio, the in-medium phi width, and the differential cross section for phi meson production at forward angles have been determined for these targets over the momentum range of 0.6 - 1.6 GeV/c. There are indications of a significant momentum dependence in the value of the extracted phi width, which corresponds to an effective phi-N absorption cross section in the range of 14 - 21 mb.
Published: 2012

37. The neutron-proton charge-exchange amplitudes measured in the dp -> ppn reaction

Author: Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H., Steffens, E., Stockhorst, H., Stroher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., Wilkin, C., Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H., Steffens, E., Stockhorst, H., Stroher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: The unpolarised differential cross section and the two deuteron tensor analysing powers A(xx) and A(yy) of the (d) over right arrowp -> {pp}(s)n charge-exchange reaction have been measured with the ANKE spectrometer at the COSY storage ring. Using deuteron beams with energies 1.2, 1.6, 1.8, and 2.27 GeV, data were obtained for small momentum transfers to a {pp}(s) system with low excitation energy. The results at the three lower energies are consistent with impulse approximation predictions based upon the current knowledge of the neutron-proton amplitudes. However, at 2.27 GeV, where these amplitudes are far more uncertain, agreement requires a reduction in the overall double-spin-flip contribution, with an especially significant effect in the longitudinal direction. These conclusions are supported by measurements of the deuteron-proton spin-correlation parameters C-x,C-x and C-y,C-y that were carried out in the (d) over right arrow(p) over right arrow -> {pp}(s)n reaction at 1.2 and 2.27 GeV. The values obtained for the proton analysing power A(y)(p) also suggest the need for a radical re-evaluation of the neutron-proton elastic scattering amplitudes at the higher energy. It is therefore clear that such measurements can provide a valuable addition to the neutron-proton database in the charge-exchange region.
Published: 2012

38. Polarization of a stored beam by spin-filtering

Author: Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisser, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., McHedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., von Würtemberg, K. M., Weidemann, C., Wüstner, P., Zupranski, P., Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisser, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., McHedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., von Würtemberg, K. M., Weidemann, C., Wüstner, P., and Zupranski, P.
Abstract: The PAX Collaboration has successfully performed a spin-filtering experiment with protons at the COSY-ring. The measurement allowed the determination of the spin-dependent polarizing cross section, that compares well with the theoretical prediction from the nucleon-nucleon potential. The test confirms that spin-filtering can be adopted as a method to polarize a stored beam and that the present interpretation of the mechanism in terms of the proton-proton interaction is correct. The outcome of the experiment is of utmost importance in view of the possible application of the method to polarize a beam of stored antiprotons., QC 20121212
Published: 2012
Full Text: View/download PDF

39. Polarization of a stored beam by spin-filtering

Author: Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisser, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., McHedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., von Würtemberg, K. M., Weidemann, C., Wüstner, P., Zupranski, P., Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisser, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., McHedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., von Würtemberg, K. M., Weidemann, C., Wüstner, P., and Zupranski, P.
Abstract: The PAX Collaboration has successfully performed a spin-filtering experiment with protons at the COSY-ring. The measurement allowed the determination of the spin-dependent polarizing cross section, that compares well with the theoretical prediction from the nucleon-nucleon potential. The test confirms that spin-filtering can be adopted as a method to polarize a stored beam and that the present interpretation of the mechanism in terms of the proton-proton interaction is correct. The outcome of the experiment is of utmost importance in view of the possible application of the method to polarize a beam of stored antiprotons., QC 20121212
Published: 2012
Full Text: View/download PDF

40. Polarization of a stored beam by spin-filtering

Author: Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisser, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., McHedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., von Würtemberg, K. M., Weidemann, C., Wüstner, P., Zupranski, P., Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisser, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., McHedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., von Würtemberg, K. M., Weidemann, C., Wüstner, P., and Zupranski, P.
Abstract: The PAX Collaboration has successfully performed a spin-filtering experiment with protons at the COSY-ring. The measurement allowed the determination of the spin-dependent polarizing cross section, that compares well with the theoretical prediction from the nucleon-nucleon potential. The test confirms that spin-filtering can be adopted as a method to polarize a stored beam and that the present interpretation of the mechanism in terms of the proton-proton interaction is correct. The outcome of the experiment is of utmost importance in view of the possible application of the method to polarize a beam of stored antiprotons., QC 20121212
Published: 2012
Full Text: View/download PDF

41. Polarization of a stored beam by spin filtering

Author: Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisserde, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Stroeher, H., Tabidze, M., Tagliente, G., Thoerngren-Engblom, R., Trusov, S., Trzcinski, A., Valdau, Yu., Vasiliev, A., von Wuertemberg, Klas Marcks, Weidemann, Chr., Wuestner, P., Zupranski, P., Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisserde, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Stroeher, H., Tabidze, M., Tagliente, G., Thoerngren-Engblom, R., Trusov, S., Trzcinski, A., Valdau, Yu., Vasiliev, A., von Wuertemberg, Klas Marcks, Weidemann, Chr., Wuestner, P., and Zupranski, P.
Abstract: The PAX Collaboration has successfully performed a spin-filtering experiment with protons at the COSY-ring. The measurement allowed the determination of the spin-dependent polarizing cross section, that compares well with the theoretical prediction from the nucleon-nucleon potential. The test confirms that spin-filtering can be adopted as a method to polarize a stored beam and that the present interpretation of the mechanism in terms of the proton-proton interaction is correct. The outcome of the experiment is of utmost importance in view of the possible application of the method to polarize a beam of stored antiprotons., AuthorCount:72
Published: 2012
Full Text: View/download PDF

42. The production of K+K- pairs in proton-proton collisions at 2.83 GeV

Author: Ye, Q. J., Hartmann, M., Maeda, Y., Barsov, S., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gao, H., Gebel, R., Hejny, V., Kacharava, A., Keshelashvili, I., Kiselev, Y. T., Khoukaz, A., Koptev, V. P., Kulessa, P., Kulikov, A., Lorentz, B., Mersmann, T., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Paryev, E. Y., Polyanskiy, A., Serdyuk, V., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Y., Wilkin, C., Wuestner, P., Ye, Q. J., Hartmann, M., Maeda, Y., Barsov, S., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gao, H., Gebel, R., Hejny, V., Kacharava, A., Keshelashvili, I., Kiselev, Y. T., Khoukaz, A., Koptev, V. P., Kulessa, P., Kulikov, A., Lorentz, B., Mersmann, T., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Paryev, E. Y., Polyanskiy, A., Serdyuk, V., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Y., Wilkin, C., and Wuestner, P.
Abstract: Differential and total cross sections for the pp -> ppK+K- reaction have been measured at a proton beam energy of 2.83 GeV using the COSY-ANKE magnetic spectrometer. Detailed model descriptions fitted to a variety of one-dimensional distributions permit the separation of the pp -> pp phi cross section from that of non-phi production. The differential spectra show that higher partial waves represent the majority of the pp -> pp phi total cross section at an excess energy of 76 MeV, whose energy dependence would then seem to require some s-wave phi-p enhancement near threshold. The non-phi data can be described in terms of the combined effects of two-body final state interactions using the same effective scattering parameters determined from lower energy data.
Published: 2012

43. Momentum dependence of the phi-meson nuclear transparency

Author: Hartmann, M., Kiselev, Y. T., Polyanskiy, A., Paryev, E. Y., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gebel, R., Hejny, V., Kaempfer, B., Keshelashvili, I., Koptev, V., Lorentz, B., Maeda, Y., Magas, V. K., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Roca, L., Schade, H., Serdyuk, V., Sibirtsev, A., Sinitsyna, V. Y., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Y., Wilkin, C., Wuestner, P., Ye, Q. J., Hartmann, M., Kiselev, Y. T., Polyanskiy, A., Paryev, E. Y., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gebel, R., Hejny, V., Kaempfer, B., Keshelashvili, I., Koptev, V., Lorentz, B., Maeda, Y., Magas, V. K., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Roca, L., Schade, H., Serdyuk, V., Sibirtsev, A., Sinitsyna, V. Y., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Y., Wilkin, C., Wuestner, P., and Ye, Q. J.
Abstract: The production of phi mesons in proton collisions with C, Cu, Ag, and Au targets has been studied via the phi -> K+K- decay at an incident beam energy of 2.83 GeV using the ANKE detector system at COSY. For the first time, the momentum dependence of the nuclear transparency ratio, the in-medium phi width, and the differential cross section for phi meson production at forward angles have been determined for these targets over the momentum range of 0.6 - 1.6 GeV/c. There are indications of a significant momentum dependence in the value of the extracted phi width, which corresponds to an effective phi-N absorption cross section in the range of 14 - 21 mb.
Published: 2012

44. The neutron-proton charge-exchange amplitudes measured in the dp -> ppn reaction

Author: Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H., Steffens, E., Stockhorst, H., Stroher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., Wilkin, C., Mchedlishvili, D., Barsov, S., Carbonell, J., Chiladze, D., Dymov, S., Dzyuba, A., Engels, R., Gebel, R., Glagolev, V., Grigoryev, K., Goslawski, P., Hartmann, M., Kacharava, A., Kamerdzhiev, V., Keshelashvili, I., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Lehrach, A., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Merzliakov, S., Mielke, M., Mikirtychyants, M., Mikirtychyants, S., Nioradze, M., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Serdyuk, V., Seyfarth, H., Stein, H., Steffens, E., Stockhorst, H., Stroher, H., Tabidze, M., Trusov, S., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: The unpolarised differential cross section and the two deuteron tensor analysing powers A(xx) and A(yy) of the (d) over right arrowp -> {pp}(s)n charge-exchange reaction have been measured with the ANKE spectrometer at the COSY storage ring. Using deuteron beams with energies 1.2, 1.6, 1.8, and 2.27 GeV, data were obtained for small momentum transfers to a {pp}(s) system with low excitation energy. The results at the three lower energies are consistent with impulse approximation predictions based upon the current knowledge of the neutron-proton amplitudes. However, at 2.27 GeV, where these amplitudes are far more uncertain, agreement requires a reduction in the overall double-spin-flip contribution, with an especially significant effect in the longitudinal direction. These conclusions are supported by measurements of the deuteron-proton spin-correlation parameters C-x,C-x and C-y,C-y that were carried out in the (d) over right arrow(p) over right arrow -> {pp}(s)n reaction at 1.2 and 2.27 GeV. The values obtained for the proton analysing power A(y)(p) also suggest the need for a radical re-evaluation of the neutron-proton elastic scattering amplitudes at the higher energy. It is therefore clear that such measurements can provide a valuable addition to the neutron-proton database in the charge-exchange region.
Published: 2012

45. The production of K+K- pairs in proton-proton collisions at 2.83 GeV

Author: Ye, Q. J., Hartmann, M., Maeda, Y., Barsov, S., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gao, H., Gebel, R., Hejny, V., Kacharava, A., Keshelashvili, I., Kiselev, Y. T., Khoukaz, A., Koptev, V. P., Kulessa, P., Kulikov, A., Lorentz, B., Mersmann, T., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Paryev, E. Y., Polyanskiy, A., Serdyuk, V., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Y., Wilkin, C., Wuestner, P., Ye, Q. J., Hartmann, M., Maeda, Y., Barsov, S., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gao, H., Gebel, R., Hejny, V., Kacharava, A., Keshelashvili, I., Kiselev, Y. T., Khoukaz, A., Koptev, V. P., Kulessa, P., Kulikov, A., Lorentz, B., Mersmann, T., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Paryev, E. Y., Polyanskiy, A., Serdyuk, V., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Y., Wilkin, C., and Wuestner, P.
Abstract: Differential and total cross sections for the pp -> ppK+K- reaction have been measured at a proton beam energy of 2.83 GeV using the COSY-ANKE magnetic spectrometer. Detailed model descriptions fitted to a variety of one-dimensional distributions permit the separation of the pp -> pp phi cross section from that of non-phi production. The differential spectra show that higher partial waves represent the majority of the pp -> pp phi total cross section at an excess energy of 76 MeV, whose energy dependence would then seem to require some s-wave phi-p enhancement near threshold. The non-phi data can be described in terms of the combined effects of two-body final state interactions using the same effective scattering parameters determined from lower energy data.
Published: 2012

46. Polarization of a stored beam by spin-filtering

Author: Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisserde, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I., Meyer, H., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H., Stockhorst, H., Straatman, H., Stroher, H., Tabidze, M., Tagliente, G., Thorngren-Engblom, R., Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., Wurtemberg, K., Weidemann, C., Wustner, P., Zupranski, P., Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisserde, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., Mchedlishvili, D., Merzliakov, S., Meshkov, I., Meyer, H., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H., Stockhorst, H., Straatman, H., Stroher, H., Tabidze, M., Tagliente, G., Thorngren-Engblom, R., Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., Wurtemberg, K., Weidemann, C., Wustner, P., and Zupranski, P.
Abstract: The PAX Collaboration has successfully performed a spin-filtering experiment with protons at the COSY-ring. The measurement allowed the determination of the spin-dependent polarizing cross section, that compares well with the theoretical prediction from the nucleon-nucleon potential. The test confirms that spin-filtering can be adopted as a method to polarize a stored beam and that the present interpretation of the mechanism in terms of the proton-proton interaction is correct. The outcome of the experiment is of utmost importance in view of the possible application of the method to polarize a beam of stored antiprotons. (C) 2012 Elsevier B.V. All rights reserved.
Published: 2012

47. Differential cross section and analysing power of the quasi-free pn -> {pp}_s pi- reaction at 353 MeV

Author: Dymov, S., Azaryan, T., Barsov, S., Baru, V., Benati, P., Bertelli, S., Chiladze, D., Dzyuba, A., Gebel, R., Goslawski, P., Guidoboni, G., Hanhart, C., Hartmann, M., Kacharava, A., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lenisa, P., Lensky, V., Lomidze, N., Lorentz, B., Macharashvili, G., Mielke, M., Mikirtytchiants, S., Merzliakov, S., Ohm, H., Papenbrock, M., Rathmann, F., Serdyuk, V., Shmakova, V., Stroeher, H., Tabidze, M., Tsirkov, D., Trusov, S., Uzikov, Y., Valdau, Y., Wilkin, C., Dymov, S., Azaryan, T., Barsov, S., Baru, V., Benati, P., Bertelli, S., Chiladze, D., Dzyuba, A., Gebel, R., Goslawski, P., Guidoboni, G., Hanhart, C., Hartmann, M., Kacharava, A., Khoukaz, A., Komarov, V., Kulessa, P., Kulikov, A., Kurbatov, V., Lenisa, P., Lensky, V., Lomidze, N., Lorentz, B., Macharashvili, G., Mielke, M., Mikirtytchiants, S., Merzliakov, S., Ohm, H., Papenbrock, M., Rathmann, F., Serdyuk, V., Shmakova, V., Stroeher, H., Tabidze, M., Tsirkov, D., Trusov, S., Uzikov, Y., Valdau, Y., and Wilkin, C.
Abstract: In order to establish links between p-wave pion production in nucleon-nucleon collisions and low energy three-nucleon scattering, an extensive programme of experiments on pion production is currently underway at COSY-ANKE. The final proton pair is measured at very low excitation energy, leading to an S-wave diproton, denoted here as {pp}_s. By using a deuterium target we have obtained data on the differential cross section and analysing power of the quasi-free pol{p}n -> {pp}_s pi- reaction at 353 MeV. The spectator proton p_sp was either measured directly in silicon tracking telescopes or reconstructed using the momentum of a detected pi-. Both observables can be described in terms of s-, p-, and d-wave pion production amplitudes. Taken together with the analogous data on the pol{p}p -> {pp}_s pi0 reaction, full partial wave decompositions of both processes were carried out.
Published: 2012

48. Momentum dependence of the phi-meson nuclear transparency

Author: Hartmann, M., Kiselev, Y. T., Polyanskiy, A., Paryev, E. Y., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gebel, R., Hejny, V., Kaempfer, B., Keshelashvili, I., Koptev, V., Lorentz, B., Maeda, Y., Magas, V. K., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Roca, L., Schade, H., Serdyuk, V., Sibirtsev, A., Sinitsyna, V. Y., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Y., Wilkin, C., Wuestner, P., Ye, Q. J., Hartmann, M., Kiselev, Y. T., Polyanskiy, A., Paryev, E. Y., Buescher, M., Chiladze, D., Dymov, S., Dzyuba, A., Gebel, R., Hejny, V., Kaempfer, B., Keshelashvili, I., Koptev, V., Lorentz, B., Maeda, Y., Magas, V. K., Merzliakov, S., Mikirtytchiants, S., Nekipelov, M., Ohm, H., Roca, L., Schade, H., Serdyuk, V., Sibirtsev, A., Sinitsyna, V. Y., Stein, H. J., Stroeher, H., Trusov, S., Valdau, Y., Wilkin, C., Wuestner, P., and Ye, Q. J.
Abstract: The production of phi mesons in proton collisions with C, Cu, Ag, and Au targets has been studied via the phi -> K+K- decay at an incident beam energy of 2.83 GeV using the ANKE detector system at COSY. For the first time, the momentum dependence of the nuclear transparency ratio, the in-medium phi width, and the differential cross section for phi meson production at forward angles have been determined for these targets over the momentum range of 0.6 - 1.6 GeV/c. There are indications of a significant momentum dependence in the value of the extracted phi width, which corresponds to an effective phi-N absorption cross section in the range of 14 - 21 mb.
Published: 2012

49. Polarization of a stored beam by spin-filtering

Author: Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisser, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., McHedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., von Würtemberg, K. M., Weidemann, C., Wüstner, P., Zupranski, P., Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisser, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., McHedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., von Würtemberg, K. M., Weidemann, C., Wüstner, P., and Zupranski, P.
Abstract: The PAX Collaboration has successfully performed a spin-filtering experiment with protons at the COSY-ring. The measurement allowed the determination of the spin-dependent polarizing cross section, that compares well with the theoretical prediction from the nucleon-nucleon potential. The test confirms that spin-filtering can be adopted as a method to polarize a stored beam and that the present interpretation of the mechanism in terms of the proton-proton interaction is correct. The outcome of the experiment is of utmost importance in view of the possible application of the method to polarize a beam of stored antiprotons., QC 20121212
Published: 2012
Full Text: View/download PDF

50. Polarization of a stored beam by spin-filtering

Author: Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisser, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., McHedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., von Würtemberg, K. M., Weidemann, C., Wüstner, P., Zupranski, P., Augustyniak, W., Barion, L., Barsov, S., Bechstedt, U., Benati, P., Bertelli, S., Carassiti, V., Chiladze, D., Ciullo, G., Contalbrigo, M., Dalpiaz, P. F., Dymov, S., Engels, R., Erwen, W., Fiorini, M., Gaisser, M., Gebel, R., Goslaswski, P., Grigoriev, K., Guidoboni, G., Kacharava, A., Khoukaz, A., Kulikov, A., Kleines, H., Langenberg, G., Lehrach, A., Lenisa, P., Lomidze, N., Lorentz, B., Macharashvili, G., Maier, R., Marianski, B., Martin, S., McHedlishvili, D., Merzliakov, S., Meshkov, I. N., Meyer, H. O., Mielke, M., Mikirtychiants, M., Mikirtychiants, S., Nass, A., Nekipelov, M., Nikolaev, N., Nioradze, M., Oellers, D., Papenbrock, M., Pappalardo, L., Pesce, A., Polyanskiy, A., Prasuhn, D., Rathmann, F., Sarkadi, J., Smirnov, A., Seyfarth, H., Shmakova, V., Statera, M., Steffens, E., Stein, H. J., Stockhorst, H., Straatman, H., Ströher, H., Tabidze, M., Tagliente, G., Thörngren Engblom, Pia, Trusov, S., Trzcinski, A., Valdau, Y., Vasiliev, A., von Würtemberg, K. M., Weidemann, C., Wüstner, P., and Zupranski, P.
Abstract: The PAX Collaboration has successfully performed a spin-filtering experiment with protons at the COSY-ring. The measurement allowed the determination of the spin-dependent polarizing cross section, that compares well with the theoretical prediction from the nucleon-nucleon potential. The test confirms that spin-filtering can be adopted as a method to polarize a stored beam and that the present interpretation of the mechanism in terms of the proton-proton interaction is correct. The outcome of the experiment is of utmost importance in view of the possible application of the method to polarize a beam of stored antiprotons., QC 20121212
Published: 2012
Full Text: View/download PDF

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