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38 results on '"Thörngren-Engblom P"'

1. Low-energy spin-physics experiments with polarized beams and targets at the COSY storage ring

Author

P. Lenisa, F. Rathmann, L. Barion, S. Barsov, S. Bertelli, V. Carassiti, G. Ciullo, M. Contalbrigo, A. Cotta Ramusino, S. Dymov, R. Engels, D. Eversheim, R. Gebel, K. Grigoryev, J. Haidenbauer, V. Hejny, H. Jagdfeld, A. Kacharava, I. Keshelashvili, A. Kononov, T. Krings, A. Kulikov, A. Lehrach, B. Lorentz, N. Lomidze, G. Macharashvili, R. Malaguti, S. Martin, S. Merzliakov, S. Mikirtychiants, A. Nass, N.N. Nikolaev, A. Pesce, D. Prasuhn, L. Semke, S. Squerzanti, H. Soltner, M. Statera, E. Steffens, H. Ströher, M. Tabidze, G. Tagliente, P. Thörngren-Engblom, S. Trusov, Yu. Uzikov, Yu. Valdau, C. Weidemann, P. Wüstner, and P. Zupranski

Subjects
Polarized beams, Particle accelerators, Storage rings, Beam handling, Solid-state detectors, Physics, QC1-999, Optics. Light, QC350-467, Descriptive and experimental mechanics, QC120-168.85
Abstract

Abstract A low-energy spin-physics program is being developed at the COSY storage ring. To support the planned experimental activities, several experimental tools for polarized beams and targets have been developed. The paper presents the physics case and the readiness of the setup for its realization.

Published
2019
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2. Low-energy spin-physics experiments with polarized beams and targets at the COSY storage ring

Author

Lenisa, P., Rathmann, F., Barion, L., Barsov, S., Bertelli, S., Carassiti, V., Ciullo, G., Contalbrigo, M., Ramusino, A. Cotta, Dymov, S., Engels, R., Eversheim, D., Gebel, R., Grigoryev, K., Haidenbauer, J., Hejny, V., Jagdfeld, H., Kacharava, A., Keshelashvili, I., Kononov, A., Krings, T., Kulikov, A., Lehrach, A., Lorentz, B., Lomidze, N., Macharashvili, G., Malaguti, R., Martin, S., Merzliakov, S., Mikirtychiants, S., Nass, A., Nikolaev, N.N., Pesce, A., Prasuhn, D., Semke, L., Squerzanti, S., Soltner, H., Statera, M., Steffens, E., Ströher, H., Tabidze, M., Tagliente, G., Thörngren-Engblom, P., Trusov, S., Uzikov, Yu., Valdau, Yu., Weidemann, C., Wüstner, P., and Zupranski, P.

Published
2019
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3. Phase measurement for driven spin oscillations in a storage ring

Author

N. Hempelmann, V. Hejny, J. Pretz, H. Soltner, W. Augustyniak, Z. Bagdasarian, M. Bai, L. Barion, M. Berz, S. Chekmenev, G. Ciullo, S. Dymov, D. Eversmann, M. Gaisser, R. Gebel, K. Grigoryev, D. Grzonka, G. Guidoboni, D. Heberling, J. Hetzel, F. Hinder, A. Kacharava, V. Kamerdzhiev, I. Keshelashvili, I. Koop, A. Kulikov, A. Lehrach, P. Lenisa, N. Lomidze, B. Lorentz, P. Maanen, G. Macharashvili, A. Magiera, D. Mchedlishvili, S. Mey, F. Müller, A. Nass, N. N. Nikolaev, M. Nioradze, A. Pesce, D. Prasuhn, F. Rathmann, M. Rosenthal, A. Saleev, V. Schmidt, Y. Semertzidis, Y. Senichev, V. Shmakova, A. Silenko, J. Slim, A. Stahl, R. Stassen, E. Stephenson, H. Stockhorst, H. Ströher, M. Tabidze, G. Tagliente, R. Talman, P. Thörngren Engblom, F. Trinkel, Yu. Uzikov, Yu. Valdau, E. Valetov, A. Vassiliev, C. Weidemann, A. Wrońska, P. Wüstner, P. Zuprański, and M. Żurek

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
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 Jülich 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.

Published
2018
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4. Connection between zero chromaticity and long in-plane polarization lifetime in a magnetic storage ring

Author

G. Guidoboni, E. J. Stephenson, A. Wrońska, Z. Bagdasarian, J. Bsaisou, S. Chekmenev, G. Ciullo, S. Dymov, D. Eversmann, M. Gaisser, R. Gebel, V. Hejny, N. Hempelmann, F. Hinder, A. Kacharava, I. Keshelashvili, P. Kulessa, P. Lenisa, A. Lehrach, B. Lorentz, P. Maanen, R. Maier, D. Mchedlishvili, S. Mey, A. Nass, A. Pesce, Y. Orlov, J. Pretz, D. Prasuhn, F. Rathmann, M. Rosenthal, A. Saleev, Y. K. Semertzidis, Y. Senichev, V. Shmakova, H. Stockhorst, H. Ströher, R. Talman, P. Thörngren Engblom, F. Trinkel, Yu. Valdau, C. Weidemann, P. Wüstner, M. Żurek, and D. Zyuzin

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
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, carbon-target 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.

Published
2018
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5. Spin tune mapping as a novel tool to probe the spin dynamics in storage rings

Author

A. Saleev, N. N. Nikolaev, F. Rathmann, W. Augustyniak, Z. Bagdasarian, M. Bai, L. Barion, M. Berz, S. Chekmenev, G. Ciullo, S. Dymov, D. Eversmann, M. Gaisser, R. Gebel, K. Grigoryev, D. Grzonka, G. Guidoboni, D. Heberling, V. Hejny, N. Hempelmann, J. Hetzel, F. Hinder, A. Kacharava, V. Kamerdzhiev, I. Keshelashvili, I. Koop, A. Kulikov, A. Lehrach, P. Lenisa, N. Lomidze, B. Lorentz, P. Maanen, G. Macharashvili, A. Magiera, D. Mchedlishvili, S. Mey, F. Müller, A. Nass, A. Pesce, D. Prasuhn, J. Pretz, M. Rosenthal, V. Schmidt, Y. Semertzidis, Y. Senichev, V. Shmakova, A. Silenko, J. Slim, H. Soltner, A. Stahl, R. Stassen, E. Stephenson, H. Stockhorst, H. Ströher, M. Tabidze, G. Tagliente, R. Talman, P. Thörngren Engblom, F. Trinkel, Yu. Uzikov, Yu. Valdau, E. Valetov, A. Vassiliev, C. Weidemann, A. Wrońska, P. Wüstner, P. Zuprański, and M. Zurek

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
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 μ rad.

Published
2017
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6. Exclusive measurement of the pp → nnπ+π+ reaction at 1.1 GeV

Author

Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, H., Clement, H., Doroshkevich, E., Demiroers, L., Ekström, C., Fransson, K., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Keleta, S., Koch, I., Kren, F., Kullander, S., Kupść, A., Marciniewski, P., Meier, R., Morosov, B., Pauly, C., Petrén, H., Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Schönning, K., Scobel, W., Shwartz, B., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zlomanczuk, J., and The CELSIUS/WASA Collaboration

Published
2011
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7. The WASA detector facility at CELSIUS

Author

Bargholtz, Chr., Bashkanov, M., Berłowski, M., Bondar, A., Bogoslawsky, D., Brodowski, W., Brudvik, J., Calén, H., Capellaro, F., Chilingarov, A., Clement, H., Comfort, J., Demirörs, L., Ekström, C., Fransson, K., Fridén, C.-J., Gerén, L., Gornov, M., Grebenev, V., Greiff, J., Gurov, Y., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, A., Johansson, T., Keleta, S., Khakimova, O., Khoukaz, A., Kilian, K., Kimura, N., Koch, I., Kolachev, G., Kren, F., Kullander, S., Kupść, A., Kuzmin, A., Kuznetsov, A., Lindberg, K., Marciniewski, P., Meier, R., Messner, O., Morosov, B., Nawrot, A., Nefkens, B.M.K., Norman, G., Oelert, W., Pauly, C., Pettersson, H., Pivovarov, A., Pätzold, J., Petukhov, Y., Povtorejko, A., Reistad, D., Ruber, R.J.M.Y., Sandukovsky, S., Schönning, K., Scobel, W., Sefzick, T., Shafigullin, R., Shwartz, B., Sidorov, V., Skorodko, T., Sopov, V., Starostin, A., Stepaniak, J., Sukhanov, A., Tchernyshev, V., Tegnér, P.-E., Thörngren Engblom, P., Tikhomirov, V., Toki, H., Turowiecki, A., Wagner, G.J., Wiedner, U., Wilhelmi, Z., Wolke, M., Yamamoto, A., Yamaoka, H., Zabierowski, J., Zartova, I., and Złomańczuk, J.

Published
2008
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8. Production of $ \rightarrow$ 3HeX reaction at 1360 and 1450 MeV

Author

Schönning, K., Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, H., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Gerén, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Kren, F., Kullander, S., Kupsc, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Petrén, H., Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegnér, P. -E., Thörngren Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Zabierowski, J., Zartova, I., and Złomanczuk, J.

Published
2010
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10. Toward polarized antiprotons: Machine development for spin-filtering experiments

Author

C. Weidemann, F. Rathmann, H. J. Stein, B. Lorentz, Z. Bagdasarian, L. Barion, S. Barsov, U. Bechstedt, S. Bertelli, D. Chiladze, G. Ciullo, M. Contalbrigo, S. Dymov, R. Engels, M. Gaisser, R. Gebel, P. Goslawski, K. Grigoriev, G. Guidoboni, A. Kacharava, V. Kamerdzhiev, A. Khoukaz, A. Kulikov, A. Lehrach, P. Lenisa, N. Lomidze, G. Macharashvili, R. Maier, S. Martin, D. Mchedlishvili, H. O. Meyer, S. Merzliakov, M. Mielke, M. Mikirtychiants, S. Mikirtychiants, A. Nass, N. N. Nikolaev, D. Oellers, M. Papenbrock, A. Pesce, D. Prasuhn, M. Retzlaff, R. Schleichert, D. Schröer, H. Seyfarth, H. Soltner, M. Statera, E. Steffens, H. Stockhorst, H. Ströher, M. Tabidze, G. Tagliente, P. Thörngren Engblom, S. Trusov, Yu. Valdau, A. Vasiliev, and P. Wüstner

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

The paper describes the commissioning of the experimental equipment and the machine studies required for the first spin-filtering experiment with protons at a beam kinetic energy of 49.3 MeV in COSY. The implementation of a low-β insertion made it possible to achieve beam lifetimes of τ_{b}=8000 s in the presence of a dense polarized hydrogen storage-cell target of areal density d_{t}=(5.5±0.2)×10^{13} atoms/cm^{2}. The developed techniques can be directly applied to antiproton machines and allow the determination of the spin-dependent p[over ¯]p cross sections via spin filtering.

Published
2015
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11. Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions⋆

Author

Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calen, H., Cappellaro, F., Clement, H., Demiroers, L., Doroshkevich, E., Duniec, D., Ekström, C., Franssen, K., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Kaskulov, M., Keleta, S., Koch, I., Kren, F., Kullander, S., Kupść, A., Kuznetsov, A., Marciniewski, P., Meier, R., Morosov, B., Pauly, C., Petterson, H., Petukhov, Y., Povtorejko, A., Schönning, K., Scobel, W., Shwartz, B., Sopov, V., Stepeniak, J., Thörngren-Engblom, P., Tikhomirov, V., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Złomanczuk, J., and The CELSIUS-WASA Collaboration

Published
2008
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13. Measuring the polarization of a rapidly precessing deuteron beam

Author

Z. Bagdasarian, S. Bertelli, D. Chiladze, G. Ciullo, J. Dietrich, S. Dymov, D. Eversmann, G. Fanourakis, M. Gaisser, R. Gebel, B. Gou, G. Guidoboni, V. Hejny, A. Kacharava, V. Kamerdzhiev, A. Lehrach, P. Lenisa, B. Lorentz, L. Magallanes, R. Maier, D. Mchedlishvili, W. M. Morse, A. Nass, D. Oellers, A. Pesce, D. Prasuhn, J. Pretz, F. Rathmann, V. Shmakova, Y. K. Semertzidis, E. J. Stephenson, H. Stockhorst, H. Ströher, R. Talman, P. Thörngren Engblom, Yu. Valdau, C. Weidemann, and P. Wüstner

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

This paper describes a time-marking system that enables a measurement of the in-plane (horizontal) polarization of a 0.97-GeV/c deuteron beam circulating in the Cooler Synchrotron (COSY) at the Forschungszentrum Jülich. The clock time of each polarimeter event is used to unfold the 120-kHz spin precession and assign events to bins according to the direction of the horizontal polarization. After accumulation for one or more seconds, the down-up scattering asymmetry can be calculated for each direction and matched to a sinusoidal function whose magnitude is proportional to the horizontal polarization. This requires prior knowledge of the spin tune or polarization precession rate. An initial estimate is refined by resorting the events as the spin tune is adjusted across a narrow range and searching for the maximum polarization magnitude. The result is biased toward polarization values that are too large, in part because of statistical fluctuations but also because sinusoidal fits to even random data will produce sizable magnitudes when the phase is left free to vary. An analysis procedure is described that matches the time dependence of the horizontal polarization to templates based on emittance-driven polarization loss while correcting for the positive bias. This information will be used to study ways to extend the horizontal polarization lifetime by correcting spin tune spread using ring sextupole fields and thereby to support the feasibility of searching for an intrinsic electric dipole moment using polarized beams in a storage ring. This paper is a combined effort of the Storage Ring EDM collaboration and the JEDI collaboration.

Published
2014
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14. First results from the CELSIUS/WASA facility

Author

Kullander, S., Bargholz, C., Bashkanov, M., Bogoslawsky, D., Calén, H., Cappellaro, F., Clement, H., Demiroers, L., Dorochkevitch, E., Ekström, C., Fransson, K., Fridén, C.J., Gornov, M., Greiff, J., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, A., Johansson, T., Keletea, S., Kimura, N., Koch, I., Kipsc, A., Kuznetsov, A., Lindberg, K., Marciniewski, P., Morosov, B., Nawrot, A., Nefkens, B., Oelert, W., Pauly, C., Petukhov, Y., Povtorejko, A., Reistad, D., Ruber, R., Sandukovsky, S., Scobel, W., Shafigulin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegner, P.-E., Tikhomirov, V., Thörngren Engblom, P., Turowiecki, A., Wagner, G., Wiedner, U., Wilhelmi, Z., Yamamoto, A., Yamaoka, H., Zabierowski, J., and Zlomanczuk, J.

Published
2003
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15. Cross sections of the [formula omitted] reaction between 310 and 425 MeV

Author

Bilger, R., Brodowski, W., Calén, H., Clement, H., Dyring, J., Ekström, C., Fäldt, G., Fransson, K., Greiff, J., Gustafsson, L., Höistad, B., Jacewicz, M., Johanson, J., Johansson, A., Johansson, T., Kilian, K., Koch, I., Kullander, S., Kupsc, A., Marciniewski, P., Morosov, B., Oelert, W., Ruber, R.J.M.Y., Sundberg, P., Shwartz, B., Stepaniak, J., Sukhanov, A., Thörngren-Engblom, P., Turowiecki, A., Wagner, G.J., Wilhelmi, Z., Wilkin, C., Zabierowski, J., and Złomańczuk, J.

Published
2001
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20. 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, P., Trusov, S., Trzcinski, A., Valdau, Yu., Vasiliev, A., von Würtemberg, K.M., Weidemann, Chr., Wüstner, P., and Zupranski, P.

Published
2012
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21. ΔΔ excitation in proton–proton induced [formula omitted] production

Author

Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, H., Clement, H., Doroshkevich, E., Demiroers, L., Ekström, C., Fransson, K., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Keleta, S., Koch, I., Kren, F., Kullander, S., Kupść, A., Marciniewski, P., Meier, R., Morosov, B., Pauly, C., Petrén, H., Petukhov, Y., Povtorejko, A., Ruber, R.J.M.Y., Schönning, K., Scobel, W., Shwartz, B., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Wagner, G.J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, J.

Published
2011
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22. The [formula omitted] reaction at [formula omitted]

Author

Schönning, K., Bargholtz, Chr., Bashkanov, M., Berłowski, M., Bogoslawsky, D., Calén, H., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Gerén, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Khakimova, O., Kren, F., Kullander, S., Kupść, A., Kuzmin, A., Lindberg, K., Marciniewski, P., Morosov, B., Oelert, W., Pauly, C., Petrén, H., Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegnér, P.-E., Thörngren Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., and Złomańczuk, J.

Published
2010
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23. Exclusive measurements of [formula omitted]: Double-pionic fusion without ABC effect

Author

Kren, F., Bashkanov, M., Bogoslawsky, D., Calén, H., Clement, H., Demiroers, L., Ekström, C., Fransson, K., Greiff, J., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Keleta, S., Koch, I., Kullander, S., Kupść, A., Marciniewski, P., Meier, R., Morosov, B., Pauly, C., Petrén, H., Petukhov, Y., Povtorejko, A., Ruber, R.J.M.Y., Schönning, K., Scobel, W., Skorodko, T., Shwartz, B., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Wagner, G.J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, J.

Published
2010
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24. Two-pion production in proton–proton collisions — experimental total cross sections and their isospin decomposition

Author

Skorodko, T., Bashkanov, M., Bogoslawsky, D., Calén, H., Clement, H., Doroshkevich, E., Demiroers, L., Ekström, C., Fransson, K., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Keleta, S., Koch, I., Kren, F., Kullander, S., Kupść, A., Marciniewski, P., Meier, R., Morosov, B., Pauly, C., Petrén, H., Petukhov, Y., Povtorejko, A., Ruber, R.J.M.Y., Schönning, K., Scobel, W., Shwartz, B., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Wagner, G.J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, J.

Published
2009
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25. Measurement of the [formula omitted] decay branching ratio

Author

Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Calén, H., Cappellaro, F., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Gerén, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Koch, I., Kullander, S., Kupść, A., Kuznetsov, A., Laukhin, I.V., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Ruber, R.J.M.Y., Schönning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegnér, P.-E., Thörngren Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Złomańczuk, J.

Published
2007
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26. The [formula omitted] reaction channels in the threshold region

Author

Pauly, C., Jacewicz, M., Koch, I., Bashkanov, M., Bogoslawsky, D., Calén, H., Capellaro, F., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Gustafsson, L., Höistad, B., Ivanov, G., Jiganov, E., Johansson, T., Keleta, S., Kullander, S., Kupść, A., Kuznetsov, A., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Petukhov, Y., Pettersson, H., Povtorejko, A., Ruber, R.J.M.Y., Schönning, K., Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thörngren Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wiedner, U., Wolke, M., Yamamoto, A., Zabierowski, J., and Złomańczuk, J.

Published
2007
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27. Exclusive measurements of [formula omitted]: The ABC effect revisited

Author

Bashkanov, M., Bogoslawsky, D., Calén, H., Cappellaro, F., Clement, H., Demiroers, L., Ekström, C., Fransson, K., Greiff, J., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Kaskulov, M.M., Keleta, S., Koch, I., Kren, F., Kullander, S., Kupść, A., Kuznetsov, A., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Petukho, Y., Povtorejko, A., Ruber, R.J.M.Y., Scobel, W., Skorodko, T., Shwartz, B., Sopov, V., Stepaniak, J., Tchernyshev, V., Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G.J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, J.

Published
2006
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28. Erratum to “Exclusive measurements of [formula omitted]: Double-pionic fusion without ABC effect” [Phys. Lett. B 684 (2–3) (2010) 110]

Author

Kren, F., Bashkanov, M., Bogoslawsky, D., Calén, H., Clement, H., Demiroers, L., Ekström, C., Fransson, K., Greiff, J., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Khakimova, O., Keleta, S., Koch, I., Kullander, S., Kupść, A., Marciniewski, P., Meier, R., Morosov, B., Pauly, C., Petrén, H., Petukhov, Y., Povtorejko, A., Ruber, R.J.M.Y., Schönning, K., Scobel, W., Skorodko, T., Shwartz, B., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Wagner, G.J., Wolke, M., Yamamoto, A., Zabierowski, J., and Zlomanczuk, J.

Published
2011
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29. Pionic Fusion Study of the halo analogue state6Li.

Author

Andersson, M., Bargholtz, C., Fransson, Kj., Holmberg, L, Lindh, K., M⇘rtensson, L., Sitnikova, I., Tegnér, P., Thörngren Engblom, P., Weiss, G., and Wilhelmsen Rolander, K.

Abstract

The isobaric analogue state of the ground state of the halo nucleus6He,6Li* has been studied in a pionic fusion experiment at the CELSIUS storage ring facility in Uppsala, Sweden. This was the first of two proposed experiments with the aim to study the high momentum part of the wave functions of the halo nuclei6He and6Li (0+, T=1). The Li nuclei were produced in inverse kinematics reactions with alpha particles incident on a deuterium cluster jet target. The6Li ions were detected in a zero-degree spectrometer situated in the fourth quadrant of the CELSIUS ring. The measurement was done for three different beam energies corresponding to 5.4, 2.2 and 1.5 MeV above threshold in the c.m. The cross-sections slowly increase with beam energy from 95 nb at the lowest energy to about 250 nb at 5.4 MeV above threshold. [ABSTRACT FROM AUTHOR]

Published
1997
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34. Phase 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 FJ, 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, Müller F, Nass A, Nikolaev NN, 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, Ströher H, Tabidze M, Tagliente G, Talman R, Thörngren Engblom P, Trinkel F, Uzikov Y, Valdau Y, Valetov E, Vassiliev A, Weidemann C, Wrońska A, Wüstner P, Zuprański P, and Żurek 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 (≈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 σ=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.

Published
2017
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35. 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, Böker J, Böhme C, Bsaisou J, Chekmenev S, Chiladze D, Ciullo G, Contalbrigo M, de Conto JM, Dymov S, Engels R, Esser FM, Eversmann D, Felden O, Gaisser M, Gebel R, Glückler H, Goldenbaum F, Grigoryev K, Grzonka D, Hahnraths T, Heberling D, Hejny V, Hempelmann N, Hetzel J, Hinder F, Hipple R, Hölscher D, Ivanov A, Kacharava A, Kamerdzhiev V, Kamys B, Keshelashvili I, Khoukaz A, Koop I, Krause HJ, Krewald S, Kulikov A, Lehrach A, Lenisa P, Lomidze N, Lorentz B, Maanen P, Macharashvili G, Magiera A, Maier R, Makino K, Mariański B, Mchedlishvili D, Meißner UG, Mey S, Morse W, Müller 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, Semertzidis Y, Senichev Y, Shmakova V, Silenko A, Simon M, Slim J, Soltner H, Stahl A, Stassen R, Statera M, Stockhorst H, Straatmann H, Ströher H, Tabidze M, Talman R, Thörngren Engblom P, Trinkel F, Trzciński A, Uzikov Y, Valdau Y, Valetov E, Vassiliev A, Weidemann C, Wilkin C, Wrońska A, Wüstner P, Zakrzewska M, Zuprański 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.

Published
2016
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36. 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 FM, Felden O, Gaisser M, Gebel R, Glückler H, Goldenbaum F, Grigoryev K, Grzonka D, Guidoboni G, Hanhart C, Heberling D, Hempelmann N, Hetzel J, Hipple R, Hölscher D, Ivanov A, Kamerdzhiev V, Kamys B, Keshelashvili I, Khoukaz A, Koop I, Krause HJ, Krewald S, Kulikov A, Lehrach A, Lenisa P, Lomidze N, Lorentz B, Maanen P, Macharashvili G, Magiera A, Maier R, Makino K, Mariański B, Mchedlishvili D, Meißner UG, 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, Ströher H, Tabidze M, Talman R, Thörngren Engblom P, Trzciński A, Uzikov Y, Valdau Y, Valetov E, Vassiliev A, Weidemann C, Wilkin C, Wirzba A, Wrońska A, Wüstner P, Zakrzewska M, Zuprański 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 ν(s)=γG (γ is the Lorentz factor, G the gyromagnetic anomaly). At 970  MeV/c, the deuteron spins coherently precess at a frequency of ≈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 1×10^{-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.

Published
2015
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37. Double-pionic fusion of nuclear systems and the "ABC" effect: approaching a puzzle by exclusive and kinematically complete measurements.

Author

Bashkanov M, Bargholtz C, Berłowski M, Bogoslawsky D, Calén H, Clement H, Demiroers L, Doroshkevich E, Duniec D, Ekström C, Fransson K, Geren L, Gustafsson L, Höistad B, Ivanov G, Jacewicz M, Jiganov E, Johansson T, Khakimova O, Keleta S, Koch I, Kren F, Kullander S, Kupść A, Lindberg K, Marciniewski P, Meier R, Morosov B, Pauly C, Pettersson H, Petukhov Y, Povtorejko A, Pricking A, Ruber RJ, Schönning K, Scobel W, Shwartz B, Skorodko T, Sopov V, Stepaniak J, Tegner PE, Thörngren-Engblom P, Tikhomirov V, Turowiecki A, Wagner GJ, Wolke M, Zabierowski J, Zartova I, and Złomanczuk J

Abstract

The ABC effect-a puzzling low-mass enhancement in the pipi invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn-->dpi;{0}pi;{0} at beam energies of 1.03 and 1.35 GeV. The measurements, which have been carried out at CELSIUS-WASA, reveal the ABC effect to be a (pipi)_{I=L=0} channel phenomenon associated with both a resonancelike energy dependence in the integral cross section and the formation of a DeltaDelta system in the intermediate state. A corresponding simple s-channel resonance ansatz provides a surprisingly good description of the data.

Published
2009
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38. Axial observables in d-->p--> breakup and the three-nucleon force.

Author

Meyer HO, Whitaker TJ, Pollock RE, Von Przewoski B, Rinckel T, Doskow J, Kuroś-Zołnierczuk J, Thörngren-Engblom P, Pancella PV, Wise T, Lorentz B, and Rathmann F

Abstract

We have measured three axial polarization observables in d-->p--> breakup with a polarized 270 MeV deuteron beam on a polarized proton target. Axial observables are zero by parity conservation in elastic scattering but can be easily observed in the breakup channel at the present energy. Based on a symmetry argument, the sensitivity of these observables to the three-nucleon force might be enhanced. Calculations without three-nucleon force are in fair agreement with our measurement, indicating that the expected sensitivity of axial observables to the three-nucleon force is not confirmed. Including a three-nucleon force in the calculation does not improve the agreement with the data.

Published
2004
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