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134 results on '"Thörngren-Engblom P"'

1. The connection between zero chromaticity and long in-plane polarization lifetime in a magnetic storage ring

Author

Guidoboni, G., Stephenson, E. J., Wrońska, A, Bagdasarian, Z., Bsaisou, J., Chekmenev, S., 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., Ströher, H., Talman, R., Thörngren-Engblom, P., Trinkel, F., Valdau, Yu., Weidemann, C., Wüstner, P., and Zyusin, D.

Subjects
Physics - Accelerator Physics, Nuclear Experiment, Physics - Instrumentation and Detectors
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., Comment: 18 pages, 18 figures, prepared for Phys. Rev. Accel. Beams

Published
2017
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2. Delta Delta Excitation in Proton-Proton Induced pi0pi0 Production

Author

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

Subjects
Nuclear Experiment
Abstract

Exclusive measurements of the $pp \to pp\pi^0\pi^0$ reaction have been performed at CELSIUS/WASA at energies from threshold up to $T_p$ = 1.3 GeV. Total and differential cross sections have been obtained. Here we concentrate on energies $T_p \ge$ 1 GeV, where the $\Delta\Delta$ excitation becomes the leading process. No evidence is found for a significant ABC effect beyond that given by the conventional $t$-channel $\Delta\Delta$ excitation. This holds also for the double-pionic fusion to the quasibound $^2$He. The data are compared to model predictions, which are based on both pion and $\rho$ exchange. Total and differential cross sections are at variance with these predictions and call for a profound modification of the $\rho$-exchange. A phenomenological modification allowing only a small $\rho$ exchange contribution leads to a quantitative description of the data.

Published
2010
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3. The pd --> ^3He eta pi0 reaction at T_p = 1450 MeV

Author

Schoenning, K., Bargholtz, Chr., Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calen, H., Clement, H., Demiroers, L., Ekstroem, C., Fransson, K., Geren, L., Gustafsson, L., Hoeistad, 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., Petren, H., Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thoerngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, M., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef

Subjects
Nuclear Experiment
Abstract

The cross section for the pd --> ^3He eta pi0 reaction has been measured at a beam energy of 1450 MeV using the WASA detector at the CELSIUS storage ring and detecting one ^3He and four photons from the decays of the two photons. The data indicate that the production mechanism involves the formation of the Delta(1232) isobar. Although the beam energy does not allow the full peak of this resonance to be seen, the invariant masses of all three pairs of final state particles are well reproduced by a phase space Monte Carlo simulation weighted with the p-wave factor of the square of the pi^0 momentum in the ^3Hepi^0 system., Comment: 10 pages, 5 figures

Published
2009
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4. 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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5. Exclusive Measurements of $pd\to ^3He \pi\pi$ : 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., Kaskulov, M. M., Keleta, S., Koch, I., Kullander, S., Kupść, A., Kuznetsov, A., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Petukhov, 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.

Subjects
Nuclear Experiment
Abstract

Exclusive measurements of the reactions $pd\to$ $^3He \pi^+ \pi^-$ and $pd\to$ $^3He \pi^0\pi^0$ have been carried out at $T_p=0.895$ GeV at the CELSIUS storage ring using the WASA detector. The $\pi^+\pi^-$ channel evidences a pronounced enhancement at low invariant $\pi\pi$ masses - as anticipated from previous inclusive measurements of the ABC effect. This enhancement is seen to be even much larger in the isoscalar $\pi^0\pi^0$ channel. The differential distributions prove this enhancement to be of scalar-isoscalar nature. $\Delta\Delta$ calculations give a good description of the data, if a boundstate condition is imposed for the intermediate $\Delta\Delta$ system., Comment: extended version, 8 pages, 7 figures, theoretical model calculations added

Published
2005
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6. Analyzing Powers and Spin Correlation Coefficients for p+d Elastic Scattering at 135 and 200 MeV

Author

Przewoski, B. v., Meyer, H. O., Balewski, J. T., Daehnick, W. W., Doskow, J., Haeberli, W., Ibald, R., Lorentz, B., Pollock, R. E., Pancella, P. V., Rathmann, F., Rinckel, T., Saha, Swapan K., Schwartz, B., Thoerngren-Engblom, P., Wellinghausen, A., Whitaker, T. J., Wise, T., and Witala, H.

Subjects
Nuclear Experiment
Abstract

The proton and deuteron analyzing powers and 10 of the possible 12 spin correlation coefficients have been measured for p+d elastic scattering at proton bombarding energies of 135 and 200 MeV. The results are compared with Faddeev calculations using two different NN potentials. The qualitative features of the extensive data set on the spin dependence in p+d elastic scattering over a wide range of angles presented here are remarkably well explained by two-nucleon force predictions without inclusion of a three-nucleon force. The remaining discrepancies are, in general, not alleviated when theoretical three-nucleon forces are included in the calculations., Comment: 43 pages, 12 figures, accepted for publication by Phys. Rev. C

Published
2004
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7. Spin correlations in $\vec{p}\vec{p}\to pn\pi^{+}$ pion production near threshold

Author

Daehnick, W. W., Saha, Swapan K., Flammang, R. W., Meyer, H. O., Balewski, J. T., Pollock, R. E., von Przewoski, B., Rinckel, T., Thörngren-Engblom, P., Wellinghausen, A., Lorentz, B., Rathmann, F., Schwartz, B., Wise, T., and Pancella, P. V.

Subjects
Nuclear Experiment
Abstract

A first measurement of longitudinal as well as transverse spin correlation coefficients for the reaction $\vec{p}\vec{p}\to pn\pi^+$ was made using a polarized proton target and a polarized proton beam. We report kinematically complete measurements for this reaction at 325, 350, 375 and 400 MeV beam energy. The spin correlation coefficients $A_{xx}+A_{yy}, A_{xx}-A_{yy}, A_{zz}, A_{xz},$ and the analyzing power $A_{y},$ as well as angular distributions for $\sigma(\theta_{\pi})$ and the polarization observables $A_{ij}(\theta_{\pi})$ were extracted. Partial wave cross sections for dominant transition channels were obtained from a partial wave analysis that included the transitions with final state angular momenta of $l\leq 1$. The measurements of the ${\vec{p}\vec{p}\to pn\pi^{+}}$ polarization observables are compared with the predictions from the J\"ulich meson exchange model. The agreement is very good at 325 MeV, but it deteriorates increasingly for the higher energies. At all energies agreement with the model is better than for the reaction ${\vec{p}\vec{p}\to pp\pi^{0}}$., Comment: Preprint, 21 pp, submitted to Phys. Rev. C. Keywords: Mesons, Polarization, Spin Correlations, Few body systems

Published
2001
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8. Measurement of Spin Correlation coefficients in \vec p \vec p --> d pi^+

Author

Przewoski, B. v., Balewski, J. T., Doskow, J., Meyer, H. O., Pollock, R. E., Rinckel, T., Thörngren-Engblom, P., Wellinghausen, A., Haeberli, W., Lorentz, B., Rathmann, F., Schwartz, B., Wise, T., Daehnick, W. W., Saha, Swapan K., and Pancella, P. V.

Subjects
Nuclear Experiment
Abstract

The spin correlation coefficent combinations A_{xx}+A_{yy} and A_{xx}-A_{yy}, the spin correlation coefficients A_{xz} and A_{zz}, and the analyzing power were measured for \vec p \vec p --> d pi^+ between center-of-mass angles 25 deg \leq \theta \leq 65 deg at beam energies of 350.5, 375.0 and 400.0 MeV. The experiment was carried out with a polarized internal target and a stored, polarized beam. Non-vertical beam polarization needed for the measurement of A_{zz} was obtained by the use of solenoidal spin rotators. Near threshold, only a few partial waves contribute, and pion s- and p-waves dominate with a possible small admixture of d-waves. Certain combinations of the observables reported here are a direct measure of these d-waves. The d-wave contributions are found to be negligible even at 400.0 MeV., Comment: 6 pages, 1 figure

Published
1999
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9. Dependence of pp->pp pi0 near Threshold on the Spin of the Colliding Nucleons

Author

Meyer, H. O., Balewski, J. T., Dzemidzic, M., Doskow, J., Pollock, R. E., Przewoski, B. v., Rinckel, T., Sperisen, F., Thörngren-Engblom, P., Wolanski, M., Haeberli, W., Lorentz, B., Rathmann, F., Schwartz, B., Wise, T., Daehnick, W. W., Flammang, R. W., Saha, Swapan K., Tedeschi, D. J., and Pancella, P. V.

Subjects
Nuclear Experiment
Abstract

A polarized internal atomic hydrogen target and a stored, polarized beam are used to measure the spin-dependent total cross section Delta_sigma_T/sigma_tot, as well as the polar integrals of the spin correlation coefficient combination A_xx-A_yy, and the analyzing power A_y for pp-> pp pi0 at four bombarding energies between 325 and 400 MeV. This experiment is made possible by the use of a cooled beam in a storage ring. The polarization observables are used to study the contribution from individual partial waves., Comment: 6 pages, 1 table, 4 figures, corrected equations 2 and 3

Published
1998
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10. 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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11. Excitation of the Roper resonance in single- and double-pion production in nucleon-nucleon collisions

Author

The CELSIUS-WASA Collaboration, 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., Hammer, Hans-Werner, editor, Kleber, Vera, editor, Thoma, Ulrike, editor, and Schmieden, Hartmut, editor

Published
2008
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12. 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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13. 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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14. A zero-degree spectrometer in CELSIUS and the d(d, 2π)4 He reaction

Author

Bargholtz, Chr., Fransson, K., Holmberg, L., Lindh, K., Protic, D., Sandberg, L., Sitnikova, I., Tegnér, P.-E., Thörngren Engblom, P., Weiss, G., Wilhelmsen Rolander, K., Mitter, H., editor, Plessas, W., editor, Adam, J., editor, Dobeš, J., editor, Mach, R., editor, Sotona, M., editor, and Dolejší, J., editor

Published
1996
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15. 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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16. 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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17. 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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18. 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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20. 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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21. 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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23. 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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24. 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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25. A zero-degree spectrometer in CELSIUS and the d(d, 2π)4 He reaction

Author

Bargholtz, Chr., primary, Fransson, K., additional, Holmberg, L., additional, Lindh, K., additional, Protic, D., additional, Sandberg, L., additional, Sitnikova, I., additional, Tegnér, P.-E., additional, Thörngren Engblom, P., additional, Weiss, G., additional, and Wilhelmsen Rolander, K., additional

Published
1995
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26. 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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27. Spin tune mapping as a novel tool to probe the spin dynamics in storage rings

Author

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

Subjects
Accelerator Physics (physics.acc-ph), Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, magnetic moment, beam dynamics, experimental methods, Physics and Astronomy (miscellaneous), dipole [magnetic moment], Socio-culturale, FOS: Physical sciences, Juelich COSY PS, Big Bang Nucleosynthesis, Beam diagnostics, 01 natural sciences, error [magnetic field], 0103 physical sciences, magnetic field: error, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, angular distribution, ddc:530, Nuclear Experiment (nucl-ex), 010306 general physics, rotation [spin], Nuclear Experiment, spin: rotation, Spin-½, Physics, electric moment [charged particle], Baryogenesis and Leptogenesis, Spins, Magnetic moment, 010308 nuclear & particles physics, background, magnetic moment: dipole, Beam dynamics, electric moment, charged particle: electric moment, Instrumentation and Detectors (physics.ins-det), Surfaces and Interfaces, sensitivity, Charged particle, Computational physics, Magnetic field, Dipole, lcsh:QC770-798, Physics - Accelerator Physics, Magnetic dipole, Storage ring
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 \textit{spin tune mapping}, emerges as a very powerful tool to probe the spin dynamics in storage rings. The technique was experimentally tested in 2014 at 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., Comment: 32 pages, 15 figures, 7 tables

Published
2017

32. 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., Böker, J., Wüstner, P., Zakrzewska, M., Zuprański, P., Zyuzin, D., Stroeher, Hans, Mey, Sebastian, Stahl, Achim, JEDI Collaboration, Böhme, C., Bsaisou, J., Chekmenev, S., Chiladze, D., Ciullo, G., Contalbrigo, M., de Conto, J.-M., Dymov, S., Engels, Ralf W., Andrianov, S., Esser, F. M., Eversmann, D., Felden, O., Gaisser, M., Gebel, R., Glückler, H., Goldenbaum, F., Grigoryev, K., Grzonka, D., Hahnraths, T., Augustyniak, W., Heberling, D., Hejny, V., Hempelmann, N., Hetzel, J., Hinder, F., Hipple, R., Hölscher, D., Ivanov, A., Kacharava, A., Kamerdzhiev, V., Bagdasarian, Z., Kamys, B., Keshelashvili, I., Khoukaz, A., Koop, I., Krause, H.-J., Krewald, S., Kulikov, A., Lehrach, A., Lenisa, P., Lomidze, N., Bai, M., Lorentz, B., Maanen, P., Macharashvili, G., Magiera, A., Maier, R., Makino, K., Mariański, B., Mchedlishvili, D., Meißner, Ulf-G., Mey, S., Baylac, M., Morse, W., Müller, F., Nass, A., Natour, G., Nikolaev, N., Nioradze, M., Nowakowski, K., Orlov, Y., Pesce, A., Prasuhn, D., Bernreuther, W., Pretz, J., Rathmann, F., Ritman, J., Rosenthal, M., Rudy, Z., Saleev, A., Sefzick, T., Semertzidis, Y., Senichev, Y., Shmakova, V., Bertelli, S., Silenko, A., Simon, M., Slim, J., Soltner, H., Stassen, R., Statera, M., Stockhorst, H., Straatmann, H., Tabidze, M., Talman, R., Berz, M., Thörngren Engblom, P., Trinkel, F., Trzciński, A., Uzikov, Yu., Valdau, Yu., Valetov, E., Vassiliev, A., Weidemann, C., Wilkin, C., Wrońska, A., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS), and JEDI

Subjects
ANOMALOUS MAGNETIC-MOMENTS, ELECTRIC-DIPOLE MOMENTS, SENSITIVITY, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], ddc:550, Socio-culturale, Physics::Accelerator Physics, Nuclear Experiment
Abstract

International audience; 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

33. The pd→He3ηπ0 reaction at Tp=1450 MeV

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.

Subjects
Nuclear and High Energy Physics
Published
2010
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34. The pp→ppπππ 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.

Subjects
Nuclear and High Energy Physics
Published
2007
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35. 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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36. ΔΔ excitation in proton–proton induced ${\pi }^{0}{\pi }^{0}$ production

Author

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

Subjects
ddc:530
Published
2011

37. Exclusive measurements of $pp\to d{\pi }^{+}{\pi }^{0}$: Double-pionic fusion without ABC effect

Author

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

Subjects
ddc:530
Abstract

Exclusive measurements of the reaction pp→dπ+π0pp→dπ+π0 have been carried out at Tp=1.1 GeVTp=1.1 GeV at the CELSIUS storage ring using the WASA detector. The isovector π+π0π+π0 channel exhibits no enhancement at low invariant ππ masses, i.e. no ABC effect. Therefore this most basic isovector double-pionic fusion reaction qualifies as an ideal test case for the conventional t-channel ΔΔ excitation process. Indeed, the obtained differential distributions reveal the conventional t-channel ΔΔ mechanism as the appropriate reaction process, which also accounts for the observed energy dependence of the total cross section.

Published
2010

38. 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

39. Production of the meson in the pd3He reaction at 1450 MeV and 1360 MeV

Author

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

Subjects
Nuclear Theory, ddc:530, Nuclear Experiment
Abstract

The production of omega mesons in the pd -> He-3 omega reaction has been studied at two energies near the kinematic threshold, T-p = 1450 MeV and T-p = 1360 MeV. The differential cross section was measured as a function of the omega c.m. angle at both energies over the whole angular range. Whereas the results at 1360 MeV are consistent with isotropy, strong rises are observed near both the forward and backward directions at 1450 MeV. Calculations made using a two-step model with an intermediate pion fail to reproduce the shapes of the measured angular distributions and also underestimate the total cross sections.

Published
2009

40. 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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41. Measurement of the eta->pi+pi-e+e- decay branching ratio

Author

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

Subjects
hadroproduction [eta], dalitz decays, 0.893 GeV-kin, exclusive reaction [p deuteron], (pi+ pi- positron electron) [mass spectrum], Uppsala CELSIUS Stor, High Energy Physics - Experiment, pair production [pi], +helium-3+eta%22">p deuteron --> helium-3 eta, ddc:530, High Energy Physics::Experiment, pair production [electron], eta meson decays, semileptonic decay [eta], +pi%2B+pi-+positron+electron%22">eta --> pi+ pi- positron electron, experimental results [magnetic detector], Nuclear Experiment, Astrophysics::Galaxy Astrophysics, branching ratio [eta]
Abstract

The reaction pd->3He eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta->pi+pi-e+e- is measured to be (4.3+/-1.3+/-0.4)x10^-4., Comment: 10 pages,6 figures revised version

Published
2006

42. 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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43. Axial Observables in dp Breakup and the Three-Nucleon Force

Author

Meyer, H. O., Whitaker, T. J., Lorentz, B., Rathmann, F., Pollock, R. E., von Przewoski, B., Rinckel, T., Doskow, J., Kuros-Zolnierczuk, J., Thörngren-Engblom, P., Pancella, P. V., and Wise, T.

Subjects
Nuclear Theory, ddc:550, Nuclear Experiment
Abstract

We have measured three axial polarization observables in (d) over right arrow(p) over right arrow 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

44. Measuring the polarization of a rapidly precessing deuteron beam

Author

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

Published
2014
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45. The (^10,11)(n,p) (^10,11)Be reactions at En = 96 MeV

Author

Ringbom, A., Blomgren, J., Condé, H., Elmgren, K., Olsson, N., Rahm, J., Rönnqvist, T., Johnsson, O., Nilsson, L., Renberg, P.-U., Tiebell, G., Thörngren Engblom, P., Bargholtz, Chr., Fransson, K., Lindh, K., Tegnér, P.-E., van der Werf, S.Y., and KVI - Center for Advanced Radiation Technology

Published
2001

46. 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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47. THE pp -> pp pi(0)pi(0) REACTION AND ITS LIMITING CASE, FUSION TO QUASI-BOUND He-2, IN SEARCH OF THE ABC EFFECT

Author

Skorodko, T., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Khakimova, O., Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, H., Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, Roger, Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zlomanczuk, Jozef, Skorodko, T., Bashkanov, M., Bogoslowsky, D., Calén, Hans, Clement, H., Doroshkevich, E., Ekström, Curt, Fransson, Kjell, Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Khakimova, O., Koch, I., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuznetsov, A., Marciniewski, Pawel, Meier, R., Morosov, B., Pauly, C., Petterson, H., Petukhov, Y., Povtorejko, A., Pricking, A., Ruber, Roger, Schönning, Karin, Scobel, W., Shwartz, B., Sopov, V., Stepaniak, J., Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., and Zlomanczuk, Jozef

Abstract

The pi(0)pi(0) production in pp-collisions has been investigated in exclusive and kinematically complete measurements from threshold up to T-p = 1.4 GeV. For incident energies T-p > 1 GeV, i.e. in the region beyond the Roper excitation, the Delta Delta excitation process takes over. The data are well explained by the t-channel Delta Delta process dominated by pion exchange. There is no low-mass enhancement (ABC effect) in the pi(0)pi(0)-invariant mass distribution beyond that given by the conventional t-channel Delta Delta process. This is also true for the limiting case, where the protons are in the quasi-bound He-2 state.

Published
2011
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49. Exclusive measurements of pp -> d pi(+)pi(0) : Double-pionic fusion without ABC effect

Author

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

Abstract

Exclusive measurements of the reaction pp -> d pi(+)pi(0) have been carried out at T-p = 1.1 GeV at the CELSIUS storage ring using the WASA detector. The isovector pi(+)pi(0) channel exhibits no enhancement at low invariant pi pi masses, i.e. no ABC effect. Therefore this most basic isovector double-pionic fusion reaction qualifies as an ideal test case for the conventional t-channel Delta Delta excitation process. Indeed, the obtained differential distributions reveal the conventional t-channel Delta Delta mechanism as the appropriate reaction process, which also accounts for the observed energy dependence of the total cross section.

Published
2010
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50. Production of the omega meson in the pd -> He-3 omega reaction at 1450 MeV and 1360 MeV

Author

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

Abstract

The production of omega mesons in the pd -> He-3 omega reaction has been studied at two energies near the kinematic threshold, T-p = 1450 MeV and T-p = 1360 MeV. The differential cross section was measured as a function of the omega c.m. angle at both energies over the whole angular range. Whereas the results at 1360 MeV are consistent with isotropy, strong rises are observed near both the forward and backward directions at 1450 MeV. Calculations made using a two-step model with an intermediate pion fail to reproduce the shapes of the measured angular distributions and also underestimate the total cross sections.

Published
2009
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