Search

Your search keyword '"L. SMYKOV"' showing total 29 results
Start Over Author "L. SMYKOV" Language undetermined
29 results on '"L. SMYKOV"'

1. Technical supplement to 'Polarization transfer observables in elastic electron-proton scattering at Q2=2.5,5.2,6.8 and 8.5GeV2'

Author

H. C. Fenker, Michael Kohl, S. Nedev, P. Carter, S. Covrig, Rolf Ent, A. Shahinyan, Joerg Reinhold, S. Dhamija, Y. Prok, X. Zhang, Bi-Tao Hu, L. Bimbot, H. Baghdasaryan, P. E. Reimer, V. Kravtsov, Salvatore Frullani, William Bertozzi, W. Luo, Franco Garibaldi, S. Širca, Lubomir Pentchev, G. M. Huber, Nuruzzaman, A. Mkrtchyan, L. Solovyev, R. Subedi, David Hamilton, Yu.V. Zanevsky, V. Mamyan, Z. Ye, D. J. Margaziotis, Y. Zhang, M. H. Shabestari, Bogdan Wojtsekhowski, C. F. Perdrisat, G. J. Kumbartzki, Ronald Ransome, M. Khandaker, G. Mbianda, H. Mkrtchyan, J. C. Cornejo, M. E. Christy, P. Bosted, A. Ahmidouch, Y. Goncharenko, C. E. Keppel, I. Sitnik, D. S. Razin, Dipangkar Dutta, V. A. Punjabi, Donal Day, Andrey Vasiliev, A. Marsh, D. G. Meekins, Emil Frlez, E. Piasetzky, W. U. Boeglin, A. Asaturyan, J. Arrington, J. Mulholland, I. Albayrak, L. Zhu, O. Moreno, P. Solvignon, K. Hafidi, O. Rondon, S. Danagoulian, B. Moffit, P. M. King, W. Hinton, M. Meziane, S. A. Wood, M. Veilleux, J. Huang, G. R. Smith, E. Tomasi-Gustafsson, Shalev Gilad, K. A. Aniol, Y. Li, T. Horn, L. Smykov, S. P. Chernenko, C. Butuceanu, James A. Miller, Amrendra Narayan, D. Gaskell, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, E. Jensen, James Maxwell, W. Pierce, Fatiha Benmokhtar, X. Zheng, Andrew Puckett, Y. Matulenko, Ronald Gilman, F. R. Wesselmann, Andrei Afanasev, A. Davidenko, Di. Kirillov, Yu.M. Mel'nik, A. Daniel, E. J. Brash, and K. Shestermanov

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Elastic electron, Observable, Technical note, Polarization (waves), 01 natural sciences, Nuclear physics, Electromagnetic calorimeter, Proton scattering, 0103 physical sciences, Born approximation, 010306 general physics, Instrumentation, Mathematical physics
Abstract

Author(s): Puckett, AJR; Brash, EJ; Jones, MK; Luo, W; Meziane, M; Pentchev, L; Perdrisat, CF; Punjabi, V; Wesselmann, FR; Afanasev, A; Ahmidouch, A; Albayrak, I; Aniol, KA; Arrington, J; Asaturyan, A; Baghdasaryan, H; Benmokhtar, F; Bertozzi, W; Bimbot, L; Bosted, P; Boeglin, W; Butuceanu, C; Carter, P; Chernenko, S; Christy, ME; Cornejo, JC; Covrig, S; Danagoulian, S; Daniel, A; Davidenko, A; Day, D; Dhamija, S; Dutta, D; Ent, R; Frullani, S; Fenker, H; Frlez, E; Garibaldi, F; Gaskell, D; Gilad, S; Gilman, R; Goncharenko, Y; Hafidi, K; Hamilton, D; Higinbotham, DW; Hinton, W; Horn, T; Hu, B; Huang, J; Huber, GM; Jensen, E; Keppel, C; Khandaker, M; King, P; Kirillov, D; Kohl, M; Kravtsov, V; Kumbartzki, G; Li, Y; Mamyan, V; Margaziotis, DJ; Marsh, A; Matulenko, Y; Maxwell, J; Mbianda, G; Meekins, D; Melnik, Y; Miller, J; Mkrtchyan, A; Mkrtchyan, H; Moffit, B; Moreno, O; Mulholland, J; Narayan, A; Nedev, S; Nuruzzaman; Piasetzky, E; Pierce, W; Piskunov, NM; Prok, Y; Ransome, RD; Razin, DS; Reimer, P; Reinhold, J; Rondon, O | Abstract: The GEp-III and GEp-2γ experiments, carried out in Jefferson Lab's Hall C from 2007–2008, consisted of measurements of polarization transfer in elastic electron–proton scattering at momentum transfers of Q2=2.5,5.2,6.8, and 8.54 GeV 2. These measurements were carried out to improve knowledge of the proton electromagnetic form factor ratio R=μpGEp∕GMp at large values of Q2 and to search for effects beyond the Born approximation in polarization transfer observables at Q2=2.5GeV2. The final results of both experiments were reported in a recent archival publication. A full reanalysis of the data from both experiments was carried out in order to reduce the systematic and, for the GEp-2γ experiment, statistical uncertainties. This technical note provides additional details of the final analysis omitted from the main publication, including the final evaluation of the systematic uncertainties.

Published
2018

2. Erratum: Polarization transfer observables in elastic electron-proton scattering at Q2=2.5 , 5.2, 6.8, and 8.5GeV2 [Phys. Rev. C 96 , 055203 (2017)]

Author

James A. Miller, D. J. Margaziotis, M. H. Shabestari, E. Tomasi-Gustafsson, V. Mamyan, S. Dhamija, James Maxwell, Y. Goncharenko, A. Shahinyan, M. Commisso, C. E. Keppel, A. J. R. Puckett, Dipanwita Dutta, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, O. Rondon, J. Arrington, Bogdan Wojtsekhowski, X. Zheng, Emil Frlez, S. A. Wood, M. Veilleux, W.U. Boeglin, P. E. Reimer, S. Frullani, W. Luo, H. C. Fenker, William Bertozzi, Di. Kirillov, A. Mkrtchyan, L. Bimbot, Fatiha Benmokhtar, I. Albayrak, O. Moreno, E. J. Brash, H. Baghdasaryan, A. Daniel, Michael Kohl, S. Nedev, P. Carter, S. Covrig, D. S. Razin, W. Hinton, I. Sitnik, Z. Ye, David Hamilton, L. Y. Zhu, Y. Zhang, Rolf Ent, Tanja Horn, K. Shestermanov, L. Solovyev, J. Mulholland, M. Khandaker, C. F. Perdrisat, Ronald Ransome, Eric L. N. Jensen, V. A. Punjabi, D. G. Meekins, E. Piasetzky, A. Davidenko, A. Asaturyan, Y. Prok, Yu.M. Mel'nik, X. Zhang, Bi-Tao Hu, P. E. Bosted, J. Huang, K. Hafidi, W. Pierce, J. Reinhold, F. R. Wesselmann, Geoffrey Smith, P. Solvignon, H. Mkrtchyan, Y. Li, G. J. Kumbartzki, M. E. Christy, Yu.V. Zanevsky, G. Mbianda, Donal Day, Y. Matulenko, Nuruzzaman, Ronald Gilman, Andrei Afanasev, S. Danagoulian, S. P. Chernenko, C. Butuceanu, Amrendra Narayan, D. Gaskell, P. M. King, J. C. Cornejo, V. Kravtsov, A. Ahmidouch, Simon Širca, G. M. Huber, F. Garibaldi, M. Meziane, Lubomir Pentchev, R. Subedi, Shalev Gilad, K. A. Aniol, Bryan J. Moffit, Andrey Vasiliev, A. Marsh, and L. Smykov

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Multiplicative function, Estimator, Observable, Statistical fluctuations, Polarization (waves), 01 natural sciences, Weighting, 0103 physical sciences, 010306 general physics, Typographical error, Statistical hypothesis testing
Abstract

Subsequent to the release of our original paper, we discovered in the context of preparing our technical supplement [1] for journal publication that a typographical error had existed in the text file that the analysis program used to construct the beam polarization "database" for both the original analysis, published in Ref. [2], and our final analysis. The electron-beam polarization P e and the analyzing power A y cancel exactly in the ratio R , which is proportional to the ratio P t / P l of the transferred polarization components. On the other hand, the extraction of the relative e dependence of P l / P Born l relies on knowledge of the beam polarization. As such, data taking was interrupted roughly every two days during the GEp - 2 ? experiment to perform invasive measurements of the beam polarization using the Hall C Moller polarimeter [3]. The run range affected by the typographical error was entirely contained within the data collected at Q 2 = 2.5 GeV 2 with a beam energy of E e = 3.680 GeV during January 2008. The data from this configuration were combined with the data collected at E e = 3.548 GeV due to the nearly complete overlap of these two settings in terms of Q 2 and e acceptance. It is worth remarking that this typographical error went unnoticed for so long because it only affected a small fraction of the data (less than half of the combined data for ? e ? = 0.790 ) and the difference between the actually assigned beam polarization and the polarization that should have been assigned was comparable in magnitude to the point-to-point systematic uncertainty of the measurement itself. As such, its effect did not show up in various diagnostic plots and statistical tests, such as the time stability of the extracted P l / P Born l ratio. The data for both E e = 3.548 and E e = 3.680 GeV were reprocessed using the corrected beam polarizations to determine the effect of the typographical error on the combined physics results at ? e ? = 0.790 . Because the value of P e cancels in the ratio R , changes in the assumed beam polarization can only affect the results for R via statistical fluctuations due to changes in the relative weighting of different run ranges in the unbinned maximum-likelihood estimators for R . These effects are negligible on the scale of both the statistical and the systematic uncertainties of the data. More noticeable changes are expected in the ratio P l / P Born l since the extracted value of P l is inversely proportional to the assumed value of P e . Table I shows the effect of the corrected beam polarization database on the polarization transfer observables for the combined data for the ? e ? = 0.790 setting, the only measurement affected by the typographical error. The analyzing power did not need to be recalibrated since it was determined using the ? e ? = 0.153 data, which were not affected by the typographical error. As expected, the change in the ratio R is negligible. The value of P Born l , which is computed event by event from the global fit described in the Appendix of the original paper and does not depend on P e , is also unchanged. The magnitudes of P t , P l , and P l / P Born l are reduced by a common multiplicative factor, reflecting the fact that the beam polarization had been underestimated for the run range affected by the typographical error. The most important result of the corrected analysis is that the ratio P l / P Born l has decreased by 0.0024 from 1.0167 to 1.0143, a change comparable in magnitude to the statistical uncertainty but small compared to the total and point-to-point systematic uncertainties. The P l / P Born l result for the original publication [2] would be reduced by the same multiplicative factor as the final result. The physics conclusions of both publications are not materially changed by this correction. (Table Presented). (Figure Presented).

Published
2018

3. Polarization transfer observables in elastic electron-proton scattering at Q2=2.5 , 5.2, 6.8, and 8.5 GeV2

Author

L. Smykov, Bogdan Wojtsekhowski, H. Mkrtchyan, L. Bimbot, H. C. Fenker, V. Kravtsov, James A. Miller, H. Baghdasaryan, K. Shestermanov, W. Hinton, Y. Matulenko, D. J. Margaziotis, Y. Li, M. H. Shabestari, S. Danagoulian, James Maxwell, Ronald Gilman, M. Commisso, E. Tomasi-Gustafsson, C. E. Keppel, X. Zheng, W. Pierce, X. Zhang, I. Albayrak, A. Asaturyan, Simon Širca, G. M. Huber, F. Garibaldi, A. Davidenko, Andrei Afanasev, Emil Frlez, G. Mbianda, S. Dhamija, J. Mulholland, O. Moreno, B. Moffit, S. Covrig, Yu.M. Mel'nik, Y. Goncharenko, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, E. Jensen, J. Huang, Di. Kirillov, L. Solovyev, S. A. Wood, M. Veilleux, P. E. Reimer, Fatiha Benmokhtar, A. Daniel, Donal Day, Andrew Puckett, S. Frullani, William Bertozzi, Michael Kohl, S. Nedev, P. Carter, B. S. Hu, F. R. Wesselmann, S. P. Chernenko, E. J. Brash, V. A. Punjabi, David Hamilton, D. S. Razin, Y. Prok, M. Khandaker, C. Butuceanu, Amrendra Narayan, D. Gaskell, I. Sitnik, Nuruzzaman, W. Luo, Dipangkar Dutta, J. Arrington, Yu.V. Zanevsky, V. Mamyan, Rolf Ent, R. Subedi, Y. Zhang, Andrey Vasiliev, A. Marsh, A. Shahinyan, P. M. King, Joerg Reinhold, J. C. Cornejo, Shalev Gilad, Ronald Ransome, Lubomir Pentchev, K. A. Aniol, C. F. Perdrisat, D. G. Meekins, Z. Ye, W. U. Boeglin, L. Zhu, O. Rondon, M. Meziane, G. J. Kumbartzki, M. E. Christy, P. Bosted, P. Solvignon, G. R. Smith, A. Ahmidouch, E. Piasetzky, K. Hafidi, A. Mkrtchyan, and T. Horn

Subjects
Elastic scattering, Physics, Proton, 010308 nuclear & particles physics, Scattering, Electron, Polarization (waves), 01 natural sciences, Helicity, Nuclear physics, 0103 physical sciences, Born approximation, 010306 general physics, Nucleon
Abstract

Author(s): Puckett, AJR; Brash, EJ; Jones, MK; Luo, W; Meziane, M; Pentchev, L; Perdrisat, CF; Punjabi, V; Wesselmann, FR; Afanasev, A; Ahmidouch, A; Albayrak, I; Aniol, KA; Arrington, J; Asaturyan, A; Baghdasaryan, H; Benmokhtar, F; Bertozzi, W; Bimbot, L; Bosted, P; Boeglin, W; Butuceanu, C; Carter, P; Chernenko, S; Christy, ME; Commisso, M; Cornejo, JC; Covrig, S; Danagoulian, S; Daniel, A; Davidenko, A; Day, D; Dhamija, S; Dutta, D; Ent, R; Frullani, S; Fenker, H; Frlez, E; Garibaldi, F; Gaskell, D; Gilad, S; Gilman, R; Goncharenko, Y; Hafidi, K; Hamilton, D; Higinbotham, DW; Hinton, W; Horn, T; Hu, B; Huang, J; Huber, GM; Jensen, E; Keppel, C; Khandaker, M; King, P; Kirillov, D; Kohl, M; Kravtsov, V; Kumbartzki, G; Li, Y; Mamyan, V; Margaziotis, DJ; Marsh, A; Matulenko, Y; Maxwell, J; Mbianda, G; Meekins, D; Melnik, Y; Miller, J; Mkrtchyan, A; Mkrtchyan, H; Moffit, B; Moreno, O; Mulholland, J; Narayan, A; Nedev, S; Nuruzzaman; Piasetzky, E; Pierce, W; Piskunov, NM; Prok, Y; Ransome, RD; Razin, DS; Reimer, P; Reinhold, J | Abstract: Background: Interest in the behavior of nucleon electromagnetic form factors at large momentum transfers has steadily increased since the discovery, using polarization observables, of the rapid decrease of the ratio GEp/GMp of the proton's electric and magnetic form factors for momentum transfers Q21 GeV2, in strong disagreement with previous extractions of this ratio using the traditional Rosenbluth separation technique. Purpose: The GEp-III and GEp-2γ experiments were carried out in Jefferson Laboratory's (JLab's) Hall C from 2007 to 2008, to extend the knowledge of GEp/GMp to the highest practically achievable Q2 given the maximum beam energy of 6 GeV and to search for effects beyond the Born approximation in polarization transfer observables of elastic ∫ - p scattering. This article provides an expanded description of the common experimental apparatus and data analysis procedures, and reports the results of a final reanalysis of the data from both experiments, including the previously unpublished results of the full-acceptance dataset of the GEp-2γ experiment. Methods: Polarization transfer observables in elastic ∫ - p→∫ - scattering were measured at central Q2 values of 2.5, 5.2, 6.8, and 8.54 GeV2. At Q2=2.5GeV2, data were obtained for central values of the virtual photon polarization parameter ϵ of 0.149, 0.632, and 0.783. The Hall C High Momentum Spectrometer detected and measured the polarization of protons recoiling elastically from collisions of JLab's polarized electron beam with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered electrons in coincidence to suppress inelastic backgrounds. Results: The final GEp-III data are largely unchanged relative to the originally published results. The statistical uncertainties of the final GEp-2γ data are significantly reduced at ϵ=0.632 and 0.783 relative to the original publication. Conclusions: The final GEp-III results show that the decrease with Q2 of GEp/GMp continues to Q2=8.5GeV2, but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At Q2=8.5GeV2, GEp/GMp remains positive but is consistent with zero. At Q2=2.5GeV2, GEp/GMp derived from the polarization component ratio R-Pt/P shows no statistically significant ϵ dependence, as expected in the Born approximation. On the other hand, the ratio P""/P""Born of the longitudinal polarization transfer component to its Born value shows an enhancement of roughly 1.7% at ϵ=0.783 relative to ϵ=0.149, with ≈2.2σ significance based on the total uncertainty, implying a similar effect in the transverse component Pt that cancels in the ratio R.

Published
2017

4. Electron/pion identification with ALICE TRD prototypes using a neural network algorithm

Author

Ken Oyama, Johanna Stachel, M. R. Stockmeier, N. Heine, C. Lippmann, A. Radu, H. Daues, W. Ludolphs, V. I. Yurevich, L. Smykov, T. Lehmann, O. Zaudtke, M. Inuzuka, Hideki Hamagaki, O. Busch, R. Santo, C. Adler, R.S. Simon, A. Sandoval, B. Vulpescu, D. Emschermann, W. Verhoeven, T. Mahmoud, Anton Andronic, A. Wilk, D. Bucher, Taku Gunji, I. Rusanov, Christoph Blume, Mihai Petrovici, G. Tsiledakis, Bernd Stefan Windelband, H. K. Soltveit, S. P. Chernenko, V. Angelov, Yu.V. Zanevsky, H. Appelshäuser, Rainer Martin Schicker, Y. Foka, Klaus Johannes Reygers, H. Gottschlag, Volker Lindenstruth, R. Glasow, D. Miskowiec, V. Catanescu, E. Kislov, N. Herrmann, O. V. Fateev, Peter Braun-Munzinger, C. Garabatos, Yu. Panebratsev, M. Ciobanu, A. Marin, H. Stelzer, V. Petracek, J. Hehner, Johannes Peter Wessels, and C. Baumann

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Artificial neural network, Physics::Instrumentation and Detectors, Nuclear Theory, Electron, Nuclear physics, Transition radiation detector, Identification (information), Pion, High Energy Physics::Experiment, Nuclear Experiment, Alice (programming language), Instrumentation, computer, computer.programming_language
Abstract

We study the electron/pion identification performance of the ALICE Transition Radiation Detector (TRD) prototypes using a neural network (NN) algorithm. Measurements were carried out for particle momenta from 2 to 6 GeV/c. An improvement in pion rejection by about a factor of 3 is obtained with NN compared to standard likelihood methods.

Published
2005

5. Di-electron measurements in C+C reactions at with HADES

Author

M. Jaskula, Y. C. Pachmayer, R. Holzmann, J. Markert, L.M. Pant, J. A. Garzón, C. Maiolino, Tatiana Karavicheva, V. T. Smolyankin, B. Ramstein, I. Iori, I. Fröhlich, J. Mousa, James Ritman, Jaroslav Bielcik, Joachim Stroth, R. Krücken, Roman Gernhäuser, M. Jurkovic, Paolo Finocchiaro, J. L. Boyard, O. V. Fateev, C. Agodi, F. Dohrmann, Piotr Salabura, B. Kämpfer, R. Novotny, Yu.V. Zanevsky, H. Alvarez-Pol, R. Djeridi, T. Pérez, G. Agakishiev, Piera Sapienza, S. Hlavac, A.P. Ierusalimov, R. Pleskac, Laura Fabbietti, M. Münch, G. Bellia, J. Novotný, Wolfgang Kuhn, R.S. Simon, M. Sánchez, I. Koenig, A. Toia, T. Christ, A. Rustamov, F. Guber, M. Wiśniowski, A. Sadovsky, P. Tlustý, V. Pospíšil, C. Sturm, S. P. Chernenko, Volker Metag, M. Roy-Stephan, M. B. Golubeva, N. Rabin, P. Zumbruch, T. Hennino, A. B. Kurepin, R. Kulessa, M. Böhmer, D. González-Díaz, A. Kugler, R. Coniglione, A. Balanda, R. Kotte, M. Traxler, B. Sailer, J. Kotulic-Bunta, V. Wagner, M. Sudol, J. Wüstenfeld, E. Grosse, B. W. Kolb, J. Otwinowski, Kalliopi Kanaki, Thomas Eberl, H. Tsertos, Peter Braun-Munzinger, W. Koenig, L. Naumann, V. Pechenov, H. Stroebele, C. Müntz, L. Smykov, I. Duran, J. Pietraszko, A. M. Schmah, S. Spataro, S. Lang, Andrey Reshetin, B. Spruck, J. Lehnert, J. Friese, T. Wojcik, D. Žovinec, and Witold Przygoda

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Spectrometer, 010308 nuclear & particles physics, Hadron, Detector, Electron, Invariant (physics), Nuclear matter, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Analysis method
Abstract

The High Acceptance DiElectron Spectrometer HADES has been recently commissioned at GSI, Darmstadt. It has been designed for systematic studies of hadron properties inside nuclear matter. We report first preliminary results on invariant masses e + e - -pairs which were measured in 12 C + 12 C collisions at E kin = 2 GeV ⋅ A . The analysis methods are briefly outlined and a comparison with detailed Monte-Carlo simulations is shown.

Published
2005

6. Position reconstruction in drift chambers operated with Xe, (15%)

Author

L. Smykov, D. Emschermann, R. Santo, V. Petracek, Christoph Blume, O. V. Fateev, R.S. Simon, H. K. Soltveit, S. Radomski, Taku Gunji, Christian Lippmann, Johanna Stachel, V. I. Yurevich, C. Adler, Oliver Busch, T. Mahmoud, Anton Andronic, Rainer Martin Schicker, C. Garabatos, H. Appelshäuser, D. Bucher, Johannes Peter Wessels, M. Inuzuka, Panagiota Foka, B. Vulpescu, H. Stelzer, H. Daues, E. Kislov, M. Ivanov, Volker Lindenstruth, N. Herrmann, G. Tsiledakis, Andres Sandoval, I. Rusanov, Mihai Petrovici, Bernd Stefan Windelband, J. Bielcikova, O. Zaudtke, Yu.V. Zanevsky, Kilian Eberhard Schwarz, V. Caˇtaˇnescu, W. Ludolphs, Peter Braun-Munzinger, and M. Ciobanu

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Monte Carlo method, Electron drift, Computational physics, Nuclear physics, Transition radiation detector, Transition radiation, Position (vector), Perpendicular, Angular resolution, Absorption (electromagnetic radiation), Instrumentation
Abstract

We present measurements of position and angular resolution of drift chambers operated with a Xe, CO 2 (15%) mixture. The results are compared to Monte Carlo simulations and important systematic effects—in particular the dispersive nature of the absorption of transition radiation and non-linearities—are discussed. The measurements were carried out with prototype drift chambers of the ALICE Transition Radiation Detector, but our findings can be generalized to other drift chambers with similar geometry, where the electron drift is perpendicular to the wire planes.

Published
2005

7. Energy loss of pions and electrons of 1– in drift chambers operated with Xe,CO2(15%)

Author

O. V. Fateev, V. Cătănescu, R. Santo, L. Smykov, V. I. Yurevich, B. Vulpescu, H. Stelzer, D. Emschermann, G. Tsiledakis, V. Petracek, T. Mahmoud, Anton Andronic, W. Ludolphs, Taku Gunji, Volker Lindenstruth, M. Inuzuka, H. Appelshäuser, R.S. Simon, Johanna Stachel, Oliver Busch, Christoph Blume, H. K. Soltveit, C. Xu, Johannes Peter Wessels, H. Daues, E. Kislov, O. Zaudtke, N. Herrmann, C. Garabatos, D. Bucher, Rainer Martin Schicker, Peter Braun-Munzinger, Andres Sandoval, M. Ciobanu, Y. Foka, Yu.V. Zanevsky, I. Rusanov, Mihai Petrovici, and Bernd Stefan Windelband

Subjects
Physics, Nuclear and High Energy Physics, Energy loss, Physics::Instrumentation and Detectors, Detector, Electron, Nuclear physics, Transition radiation detector, Pion, Transition radiation, Particle, Atomic physics, Nuclear Experiment, Instrumentation, Fermi Gamma-ray Space Telescope
Abstract

We present measurements of the energy loss of pions and electrons in drift chambers (DC) operated with a Xe,CO 2(15%) mixture. The measurements are carried out for particle momenta from 1 to 6 GeV /c using prototype DC for the ALICE transition radiation detectors. Microscopic calculations are performed using input parameters calculated with GEANT3. These calculations reproduce well the measured average and most probable values for pions, but a higher Fermi plateau is required in order to reproduce our electron data. The widths of the measured distributions are smaller for data compared to the calculations. The electron/pion identification performance using the energy loss is also presented.

Published
2004

8. Development of low-mass drift chambers for the HADES spectrometer

Author

A Petrov, Yu.V. Zanevsky, Joachim Stroth, Manfred Sobiella, L. Smykov, W. Koenig, F. Dohrmann, P Zumbruch, S. P. Chernenko, J Kempter, O. V. Fateev, J. Wüstenfeld, E. Grosse, J. Pouthas, H. Daues, Wolfgang Enghardt, P. Rosier, C. Garabatos, J L Boyard, L. Naumann, C. Müntz, L. Glonti, H. Bokemeyer, H. Stelzer, V. F. Chepurnov, J. Hehner, T. Hennino, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Toroid, Meson, Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, 7. Clean energy, 01 natural sciences, Charged particle, Particle detector, Nuclear physics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, 010306 general physics, Instrumentation, Event (particle physics), Beam (structure)
Abstract

The High Acceptance Di-Electron Spectrometer (HADES) is a detector arrangement combined with a superconducting toroid for lepton pair spectroscopy presently built up at GSI (Darmstadt). HADES is designed to cope with the high-multiplicity environment of heavy ion collisions at 1AGeV and intensities of up to 108 beam particles per second and central event rates of 105 s-1. The detector has a geometrical acceptance of almost 50% for e+e- pairs and a mass resolution of 0.8% for ρ and ω mesons. Four low-mass drift chamber systems, two before and two behind the magnet, serve for charged particle track reconstruction. Design aspects of the drift chambers and first results from beam tests are presented.

Published
2002

9. Elliptic Flow inAu+AuCollisions at√sNN=130GeV

Author

N. Stone, Christophe Pierre Suire, A. Lebedev, B. Miller, M. M. de Moura, M. Dialinas, P. Middlekamp, J. Scheblien, V. Ghazikhanian, A. Etkin, A. H. Tang, A. P. Meschanin, R.Kh. Kutuev, J. Berger, J. L. Romero, V. Fine, J. Engelage, T. J. Humanic, Peter J. Lindstrom, D. Zimmerman, I.A. Savin, N. T. Porile, Yu A. Matulenko, M. Horsley, Thomas LeCompte, B. Stringfellow, J. Sedlmeir, L. Smykov, E. Finch, T. S. McShane, J. W. Harris, Joakim Nystrand, V. B. Dunin, J. Grabski, P. Seyboth, D. Dayton, C. J. Liaw, R. Bossingham, J. N. Marx, C. Drancourt, S. Tonse, W. S. Deng, J. G. Cramer, R. A. Scheetz, A. Stolpovsky, H. Hümmler, L. Kotchenda, G. Koehler, E. Gushin, G. J. Kunde, P. Yepes, V. Eckardt, M. Kramer, A. I. Pavlinov, Y. Panebratsev, D. Grosnick, Granville Ott, G. Eppley, A. V. Brandin, V. Trofimov, J. M. Landgraf, M. Strikhanov, K. Krueger, M. B. Tonjes, E. I. Shakaliev, A. Yokosawa, Jinghui Yang, E. Sugarbaker, J. Hunter, H. Z. Huang, V. Morozov, A. Tarchini, S. V. Razin, K. Wilson, G. Rai, Y. Shi, G. Van Buren, J. M. Nelson, P. A. DeYoung, J. Pluta, C. Roy, H. Stroebele, J. Carroll, C. Byrd, N. Xu, G. D. Westfall, D. Padrazo, R. Wells, C. Struck, W. Pinganaud, D. Hardtke, F. Laue, J.F. Amsbaugh, Jay Roberts, N. Adams, David Fritz, J. Sandweiss, G. LoCurto, A. C. Saulys, S. R. Klein, C. E. Allgower, R. D. Majka, J. Zhu, Sergey Voloshin, J. Sowinski, Matthew Nguyen, W. Peryt, J. Takahashi, J. Wolf, C. Feliciano, Y. Fisyak, L. Greiner, K. J. Foley, J. Schambach, E. L. Hjort, S. Pirogov, A. Ogawa, Ian Johnson, Krista M. Marks, S. E. Vigdor, Vladimir Petrov, C. L. Kunz, Z. Li, O. Barannikova, D. L. Olson, F. P. Brady, Gerald W Hoffmann, S. P. Chernenko, D. Seliverstov, A. Schüttauf, Christian Claude Kuhn, W. J. Llope, Q. Li, C. O. Blyth, C. F. Moore, M. Cherney, H. Fessler, W. Christie, Thomas Michael Cormier, D.E. Greiner, T. Krupien, Torre Wenaus, Masashi Kaneta, Ross Schlueter, W. M. Zhang, Andrey Vasiliev, D. Hill, Richard C. Jared, M. Calderón de la Barca Sánchez, R. Weidenbach, T. Nguyen, A. Cardenas, Peter Martin Jacobs, N. Schmitz, S. Chatopadhyay, P. Nevski, M. Lopez-Noriega, A. Klyachko, R. Witt, E. Yamamoto, J. Klay, Thomas A. Trainor, W. R. Edwards, P. Sappenfield, N.D. Gagunashvili, J. Baudot, E. A. Matyushevski, P. Kuczewski, J. C. Dunlop, A. A. Derevschikov, K. Olchanski, V. I. Danilov, C. P. Lansdell, Wilfred J. Braithwaite, E. Mogavero, R.J.M. Snellings, Janet Elizabeth Seger, J. Lin, M. A. C. Lamont, S. B. Nurushev, Z. Milosevich, B. Lasiuk, J. Wisdom, Y. V. Zanevski, F. Retiere, W. Hunt, V. Kormilitsyne, D. Russ, B. E. Bonner, J. T.M. Chrin, G. S. Mutchler, H. Diaz, J. R. Hall, Zubayer Ahammed, G. A. Ososkov, M. J. LeVine, B. Norman, J. Gross, H. Long, K. Bradley, Yu Chen, Wen-Chang Chen, N. G. Minaev, O. D. Tsai, R. P. Scharenberg, Marie Germain, R. Seymour, M. A. Howe, B. Choi, R. Marstaller, W. Betts, Vladimir Tikhomirov, Salahuddin Ahmad, I. Polk, H. S. Matis, G. C. Harper, A. S. Hirsch, P. Kravtsov, A. Maliszewski, Alexander Kovalenko, L. V. Nogach, L. C. Bland, S. Bennett, H. J. Crawford, I. Vakula, C. Adler, F. S. Bieser, L. Wood, A. N. Zubarev, C. A. Ogilvie, G. Brugalette, V. S. Shvetcov, L. S. Schroeder, J. Meier, H. Liu, S. U. Pandey, A. E. Yakutin, I. Flores, Morton Kaplan, V. Perevotchikov, C. A. Whitten, M. Pentia, Marek Gazdzicki, L. Lakehal-Ayat, D. Lopiano, S. Trentalange, A. Ridiger, W. W. Jacobs, M. I. Ferguson, J. Lamas-Valverde, C. Gojak, M. Botlo, Guy Paic, I. Sakrejda, T. Ngo, E. Platner, B. Minor, V. Lindenstruth, V. A. Nikitin, S. Heppelmann, D. Flierl, Ma Bloomer, John Z. H. Zhang, A. Chikanian, S. S. Shimanskii, J. Mitchell, E. G. Judd, L. Martin, Jeffrey G. Reid, B. K. Srivastava, I. M. Vasilevski, K. E. Shestermanov, V. V. Belaga, Lincoln D. Carr, J. Gans, S. Lange, L. Arnold, Boris Hippolyte, G. Skoro, M. Heffner, J. E. Draper, J. Puskar-Pasewicz, R. Morse, V. Grigoriev, J. P. Coffin, O. V. Rogachevski, N. Bouillo, M. DeMello, S. J. Lindenbaum, N. Mikhalin, A. Boucham, H. Ward, M. Oldenburg, Peter Graham Jones, R. L. Ray, V. Emelianov, D. Keane, A. R. Baldwin, A. A. P. Suaide, L. Didenko, Damien Bonnet, Nikolai Smirnov, R. Stock, S. Y. Panitkin, E. Potrebenikova, W. J. Leonhardt, S. Bekele, S. Bouvier, V. P. Kenney, L. G. Efimov, Frank Jm Geurts, Yu. Ivanshin, J. Castillo, S. W. Wissink, R. L. Brown, W. Dominik, P. Jensen, A. Ishihara, T. Ljubicic, Alexander Khodinov, Robert Stone, M. Tokarev, G. Guilloux, Robert R. J. Maier, D. DiMassimo, E. Anderssen, A. M. VanderMolen, H. H. Wieman, H. Caines, S. Jacobson, D. Shuman, R. Willson, D. G. Underwood, J. Wirth, D. Reichhold, T. J. Hallman, T. J. M. Symons, K. Turner, A. Szanto de Toledo, A. M. Poskanzer, J. Tarzian, P. He, K. Solberg, T. Pawlak, A. Vanyashin, Z. Sandler, B. Caylor, R. S. Longacre, V. L. Rykov, J. Porter, G. Igo, J. Seyboth, P. Fachini, D. D. Weerasundara, Mingshui Chen, M. Grau, S. Margetis, O. A. Grachov, M. Schulz, J. R. Lutz, Rainer Arno Ernst Renfordt, J. Balewski, H. G. Ritter, Claude Andre Pruneau, H. Arnesen, R. Zoulkarneev, R. Bellwied, A. S. Konstantinov, K. H. Ackermann, D. M. Moltz, A. A. Kuznetsov, Ivan Kotov, T. Noggle, V. M. Leontiev, Olivier Ravel, J. Whitfield, T. Ullrich, D. Roehrich, B. Erazmus, Z. Z. Xu, D. Cebra, C. Consiglio, M. Beddo, Yu Melnick, P. Leszczynski, J. Bercovitz, T. Herston, J. Riso, Lee Stuart Barnby, V. A. Moiseenko, Marcelo Gameiro Munhoz, D. J. Prindle, E. J. Stephenson, M. A. Lisa, W. A. Love, T. Nussbaum, Daniel Ferenc, Fuqiang Wang, H. Bichsel, G. Odyniec, V. I. Yurevich, E. S. Braithwaite, J. Boehm, T. Eggert, David Lynn, L. Madansky, R. Sanchez, J. Dioguardi, J. H. Thomas, L. Conin, G. Visser, G. S. Averichev, C. P. McParland, H. M. Spinka, J. Rasson, Chinh Vu, and Matthew J. Anderson

Subjects
Physics, Particle physics, Time projection chamber, Hadron, Elliptic flow, General Physics and Astronomy, Observable, Particle accelerator, Charged particle, law.invention, Nuclear physics, law, Pseudorapidity, Nuclear Experiment, Relativistic Heavy Ion Collider
Abstract

Elliptic flow from nuclear collisions is a hadronic observable sensitive to the early stages of system evolution. We report first results on elliptic flow of charged particles at midrapidity in Au+Au collisions at √(sNN) = 130 GeV using the STAR Time Projection Chamber at the Relativistic Heavy Ion Collider. The elliptic flow signal, v₂, averaged over transverse momentum, reaches values of about 6% for relatively peripheral collisions and decreases for the more central collisions. This can be interpreted as the observation of a higher degree of thermalization than at lower collision energies. Pseudorapidity and transverse momentum dependence of elliptic flow are also presented.

Published
2001

10. Optimisation of low-mass drift chambers for HADES

Author

P. Zumbruch, L. Smykov, Yu. V. Zanewsky, A. Steigerwald, A. Zentek, W. Koenig, C. Garabatos, O. V. Fateev, S. P. Chernenko, Joachim Stroth, J. Wüstenfeld, K. Bethge, H. Bokemeyer, L. Glonti, H. Stelzer, W. Karig, and C. Müntz

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, business.industry, chemistry.chemical_element, Tracking (particle physics), Particle detector, Radiation length, Cathode, law.invention, Nuclear physics, Optics, chemistry, Townsend discharge, law, Measuring instrument, business, Instrumentation, Helium
Abstract

A set of low-mass drift chambers designed for the tracking of di-electrons in the HADES spectrometer is presented. Short radiation length is ensured by using a Helium-based gas mixture and aluminium cathode wires, whereas the acceptance is maximised by limiting the width of the side frames of the detectors. The measured performance of these devices, which improves with increasing concentration of quencher gas, is shown and discussed. Position resolutions down to 70 μm have been obtained under stable operation. Long-term gain stability is also reported.

Published
1998

11. X-ray detectors based on multiwire proportional chambers

Author

M. S. Dubrovin, Yu. G. Ukraintsev, Alexey Talyshev, G.A. Savinov, A.G. Khabakhpashev, V.V. Porosev, V.R. Groshev, Yu. S. Velikzhanin, E. L. Nekhanevich, E.A. Babichev, S.E. Baru, L. Smykov, L. Shekhtman, V.M. Titov, Yu.V. Zanevsky, and V.M. Aulchenko

Subjects
Physics, Nuclear and High Energy Physics, Wire chamber, business.industry, Detector, X-ray detector, Bremsstrahlung, Synchrotron radiation, Particle detector, Optics, business, Instrumentation, Image resolution, Storage ring
Abstract

The multiwire proportional chamber (MWPC), operating in a direct photon-counting mode, is used as the basis of 1D and 2D X-ray detectors. The 1D detector used in our scanning radiographic systems is serially produced. Its counting rate is about 200 MHz, its spatial resolution 0.6 mm, the number of channels is 640. The 2D detector, designed for diffraction structural researches on synchrotron radiation at the storage ring VEPP-3, is being commissioned now. Its characteristics are: 5 MHz, 1.5 mm, 65536 channels. The second 1D detector (10 MHz, 75 μm, 3300 channels, σ = 150 μm) is made for the same purposes. A third 1D detector with a registration angle of 60° (500 MHz, 0.6 mm, 1900 channels) is under development. All the detectors operate in a frame-by-frame mode and are free (except 2D) of parallax error.

Published
1997

12. Polarization components in π0 photoproduction at photon energies up to 5.6 GeV

Author

M. Commisso, C. E. Keppel, L. Y. Zhu, Emil Frlez, L. Solovyev, S. Frullani, V. A. Punjabi, I. Albayrak, G. Mbianda, D. G. Meekins, I. I. Strakovsky, P. Bosted, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, Y. Zhang, M. Meziane, E. Jensen, Donal Day, C. F. Perdrisat, A. Mkrtchyan, H. Mkrtchyan, A. Ahmidouch, P. E. Reimer, W. Hinton, H. C. Fenker, Nuruzzaman, E. J. Brash, Omar Moreno, S. Dhamija, P. M. King, Di. Kirillov, I. Sitnik, Y. Li, A. Asaturyan, A. Shahinyan, D. S. Razin, Fatiha Benmokhtar, Y. Matulenko, S. A. Wood, A. Daniel, E. Piasetzky, M. H. Shabestari, D. J. Margaziotis, S. Danagoulian, M. Veilleux, X. Zhang, V. Mamyan, E. Tomasi-Gustafsson, J. Huang, A. Davidenko, O. Ates, Dipanwita Dutta, L. Bimbot, Ronald Gilman, K. Hafidi, V. Kravtsov, Y. Goncharenko, J. Arrington, Yu.M. Mel'nik, Y. Prok, A. J. R. Puckett, Z. Ye, H. Baghdasaryan, F. R. Wesselmann, Bi-Tao Hu, William Bertozzi, Lubomir Pentchev, R. Subedi, S. P. Chernenko, Riad Suleiman, Simon Širca, G. M. Huber, F. Garibaldi, S. Covrig, David Hamilton, C. Butuceanu, Pete Markowitz, Amrendra Narayan, Rolf Ent, J. Mulholland, L. Smykov, D. Gaskell, Michael Kohl, S. Nedev, P. Carter, M. Khandaker, Tanja Horn, James A. Miller, G. J. Kumbartzki, M. E. Christy, James Maxwell, J. Reinhold, X. Zheng, O. Rondon, W. Luo, George Davey Smith, Ronald Ransome, Shalev Gilad, J. C. Cornejo, W. U. Boeglin, K. A. Aniol, Bryan J. Moffit, Andrey Vasiliev, A. Marsh, W. Pierce, Yu.V. Zanevsky, P. Solvignon, H. Kang, K. Shestermanov, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Quantum chromodynamics, Physics, Particle physics, Proton, 010308 nuclear & particles physics, Scattering, Hadron, General Physics and Astronomy, Perturbative QCD, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Photon energy, 01 natural sciences, 7. Clean energy, Helicity, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment
Abstract

We present new data for the polarization observables of the final state proton in the $^{1}H(\vec{\gamma},\vec{p})\pi^{0}$ reaction. These data can be used to test predictions based on hadron helicity conservation (HHC) and perturbative QCD (pQCD). These data have both small statistical and systematic uncertainties, and were obtained with beam energies between 1.8 and 5.6 GeV and for $\pi^{0}$ scattering angles larger than 75$^{\circ}$ in center-of-mass (c.m.) frame. The data extend the polarization measurements data base for neutral pion photoproduction up to $E_{\gamma}=5.6 GeV$. The results show non-zero induced polarization above the resonance region. The polarization transfer components vary rapidly with the photon energy and $\pi^{0}$ scattering angle in c.m. frame. This indicates that HHC does not hold and that the pQCD limit is still not reached in the energy regime of this experiment., Comment: 6 pages and 2 figures

Published
2012

13. Search for Effects Beyond the Born Approximation in Polarization Transfer Observables ine→pElastic Scattering

Author

M. H. Shabestari, O. Ates, I. Albayrak, T. Horn, L. Pentchev, M. Commisso, H. Mkrtchyan, C. E. Keppel, Ronald Ransome, D. J. Margaziotis, W. Pierce, X. Zhang, Y. Matulenko, L. Y. Zhu, Emil Frlez, G. R. Smith, W. Hinton, John Arrington, D. G. Meekins, I. Sitnik, Ronald Gilman, A. Asaturyan, L. Bimbot, P. Solvignon, S. Covrig, E. Piasetzky, F. R. Wesselmann, Shalev Gilad, H. Baghdasaryan, W. U. Boeglin, J. Huang, P. M. King, Douglas Higinbotham, C. F. Perdrisat, M. K. Jones, N. M. Piskunov, P. Bosted, Z. Ye, L. Smykov, G. Mbianda, Y. Li, Kravtsov, K. A. Aniol, K. Hafidi, E. Jensen, Dipangkar Dutta, E. Tomasi-Gustafsson, William Bertozzi, James A. Miller, Y. Zhang, J. Reinhold, O. Moreno, David Hamilton, W. Luo, D. S. Razin, Pete Markowitz, M. Khandaker, Bogdan Wojtsekhowski, James Maxwell, P. E. Reimer, Donal Day, O. Rondon, Michael Kohl, S. Nedev, X. Zheng, P. Carter, S. P. Chernenko, D. Kirillov, Andrey Vasiliev, A. Marsh, C. Butuceanu, L. Solovyev, G. Kumbartzki, Marc Vanderhaeghen, Amrendra Narayan, Fatiha Benmokhtar, B. Hu, D. Gaskell, E. Christy, Yu.M. Mel'nik, Punjabi, S. A. Wood, A. Ahmidouch, M. Veilleux, A. Mkrtchyan, S. Frullani, J. Mulholland, R. Subedi, S. Dhamija, S. Danagoulian, B. Moffit, Yu.V. Zanevsky, Y. Prok, K. Shestermanov, M. Meziane, A. Davidenko, Mamyan, J. C. Cornejo, H. Kang, H. C. Fenker, Nuruzzaman, Rolf Ent, A. Shahinyan, Y. Goncharenko, Simon Širca, G. M. Huber, F. Garibaldi, A. J. R. Puckett, A. Daniel, R. Suleiman, and E. J. Brash

Subjects
Elastic scattering, Physics, Particle physics, 010308 nuclear & particles physics, Hadron, Momentum transfer, General Physics and Astronomy, Elementary particle, 01 natural sciences, Baryon, 0103 physical sciences, Magnetic form factor, High Energy Physics::Experiment, Born approximation, 010306 general physics, Nucleon
Abstract

Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, $$G_{E}/G_{M}$$, obtained separately from cross section and polarization transfer measurements. One possible explanation for this difference is a two-photon-exchange (TPEX) contribution. In an effort to search for effects beyond the one-photon-exchange or Born approximation, we report measurements of polarization transfer observables in the elastic $$H(\vec{e},e'\vec{p})$$ reaction for three different beam energies at a fixed squared momentum transfer $Q^2 = 2.5$ GeV$^2$, spanning a wide range of the virtual photon polarization parameter, $$\epsilon$$. From these measured polarization observables, we have obtained separately the ratio $R$, which equals $$\mu_p G_{E}/G_{M}$$ in the Born approximation, and the longitudinal polarization transfer component $$P_\ell$$, with statistical and systematic uncertainties of $$\Delta R \approx \pm 0.01 \mbox{(stat)} \pm 0.013 \mbox{(syst)}$$ and $$\Delta P_\ell/P^{Born}_{\ell} \approx \pm 0.006 \mbox{(stat)}\pm 0.01 \mbox{(syst)}$$. The ratio $R$ is found to be independent of $$\epsilon$$ at the 1.5% level, while the $$\epsilon$$ dependence of $$P_\ell$$ shows an enhancement of $$(2.3 \pm 0.6) %$$ relative to the Born approximation at large $$\epsilon$$.

Published
2011

14. Search for effects beyond the born approximation in polarization transfer observables in e(over→)p elastic scattering

Author

M, Meziane, E J, Brash, R, Gilman, M K, Jones, W, Luo, L, Pentchev, C F, Perdrisat, A J R, Puckett, V, Punjabi, F R, Wesselmann, A, Ahmidouch, I, Albayrak, K A, Aniol, J, Arrington, A, Asaturyan, O, Ates, H, Baghdasaryan, F, Benmokhtar, W, Bertozzi, L, Bimbot, P, Bosted, W, Boeglin, C, Butuceanu, P, Carter, S, Chernenko, E, Christy, M, Commisso, J C, Cornejo, S, Covrig, S, Danagoulian, A, Daniel, A, Davidenko, D, Day, S, Dhamija, D, Dutta, R, Ent, S, Frullani, H, Fenker, E, Frlez, F, Garibaldi, D, Gaskell, S, Gilad, Y, Goncharenko, K, Hafidi, D, Hamilton, D W, Higinbotham, W, Hinton, T, Horn, B, Hu, J, Huang, G M, Huber, E, Jensen, H, Kang, C, Keppel, M, Khandaker, P, King, D, Kirillov, M, Kohl, V, Kravtsov, G, Kumbartzki, Y, Li, V, Mamyan, D J, Margaziotis, P, Markowitz, A, Marsh, Y, Matulenko, J, Maxwell, G, Mbianda, D, Meekins, Y, Melnik, J, Miller, A, Mkrtchyan, H, Mkrtchyan, B, Moffit, O, Moreno, J, Mulholland, A, Narayan, Nuruzzaman, S, Nedev, E, Piasetzky, W, Pierce, N M, Piskunov, Y, Prok, R D, Ransome, D S, Razin, P E, Reimer, J, Reinhold, O, Rondon, M, Shabestari, A, Shahinyan, K, Shestermanov, S, Širca, I, Sitnik, L, Smykov, G, Smith, L, Solovyev, P, Solvignon, R, Subedi, R, Suleiman, E, Tomasi-Gustafsson, A, Vasiliev, M, Vanderhaeghen, M, Veilleux, B B, Wojtsekhowski, S, Wood, Z, Ye, Y, Zanevsky, X, Zhang, Y, Zhang, X, Zheng, and L, Zhu

Abstract

Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, G(E)/G(M), obtained separately from cross section and polarization transfer measurements. One possible explanation for this difference is a two-photon-exchange contribution. In an effort to search for effects beyond the one-photon-exchange or Born approximation, we report measurements of polarization transfer observables in the elastic H(e[over →],e(')p[over →]) reaction for three different beam energies at a Q(2)=2.5 GeV(2), spanning a wide range of the kinematic parameter ε. The ratio R, which equals μ(p)G(E)/G(M) in the Born approximation, is found to be independent of ε at the 1.5% level. The ε dependence of the longitudinal polarization transfer component P(ℓ) shows an enhancement of (2.3±0.6)% relative to the Born approximation at large ε.

Published
2010

15. Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio toQ2=8.5 GeV2

Author

Y. Matulenko, Ronald Gilman, S. A. Wood, M. Veilleux, L. Solovyev, H. Mkrtchyan, Douglas Higinbotham, M. K. Jones, N. M. Piskunov, E. Jensen, M. Meziane, John Arrington, M. Commisso, C. E. Keppel, Z. Ye, R. Subedi, A. Ahmidouch, F. R. Wesselmann, Emil Frlez, M. H. Shabestari, D. J. Margaziotis, Y. Zhang, Fatiha Benmokhtar, V. Kravtsov, I. Albayrak, Nuruzzaman, E. Tomasi-Gustafsson, Y. Prok, L. Pentchev, A. Asaturyan, L. Smykov, G. R. Smith, T. Horn, Bogdan Wojtsekhowski, S. Covrig, Ronald Ransome, W. Pierce, X. Zhang, S. P. Chernenko, S. Frullani, Dipangkar Dutta, D. S. Razin, Andrey Vasiliev, L. Bimbot, A. Marsh, James A. Miller, P. E. Reimer, P. Solvignon, E. Christy, D. G. Meekins, J. Huang, E. J. Brash, C. Butuceanu, P. M. King, J. Reinhold, A. Davidenko, I. Sitnik, H. Baghdasaryan, Amrendra Narayan, Simon Širca, G. M. Huber, F. Garibaldi, D. Gaskell, James Maxwell, W. U. Boeglin, William Bertozzi, Y. Goncharenko, Y. Li, C. F. Perdrisat, A. J. R. Puckett, David Hamilton, B. Moffit, X. Zheng, G. Mbianda, Shalev Gilad, J. C. Cornejo, D. Kirillov, A. Daniel, M. Khandaker, K. A. Aniol, G. Kumbartzki, W. Luo, J. Mulholland, H. C. Fenker, Yu.M. Mel'nik, L. Zhu, O. Rondon, A. Shahinyan, Donal Day, O. Moreno, Yu.V. Zanevsky, V. Mamyan, K. Shestermanov, Rolf Ent, S. Danagoulian, P. Bosted, S. Dhamija, B. Hu, Michael Kohl, S. Nedev, P. Carter, V. A. Punjabi, W. Hinton, E. Piasetzky, K. Hafidi, and A. Mkrtchyan

Subjects
Physics, Quark, Particle physics, Proton, Nuclear Theory, Hadron, Momentum transfer, Strong interaction, General Physics and Astronomy, Elementary particle, Nuclear physics, Recoil, Nuclear Experiment, Nucleon
Abstract

Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing the strong interaction dynamics of the nucleon’s quark constituents; indeed, recent proton data have attracted intense theoretical interest. In this Letter, we report new measurements of the proton electromagnetic form factor ratio using the recoil polarization method, at momentum transfers Q2=5.2, 6.7, and 8.5 GeV2. By extending the range of Q2 for which GEp is accurately determined by more than 50%, these measurements will provide significant constraints on models of nucleon structure in the nonperturbative regime.

Published
2010

16. Recoil polarization measurements of the proton electromagnetic form factor ratio to Q2 = 8.5 GeV2

Author

A J R, Puckett, E J, Brash, M K, Jones, W, Luo, M, Meziane, L, Pentchev, C F, Perdrisat, V, Punjabi, F R, Wesselmann, A, Ahmidouch, I, Albayrak, K A, Aniol, J, Arrington, A, Asaturyan, H, Baghdasaryan, F, Benmokhtar, W, Bertozzi, L, Bimbot, P, Bosted, W, Boeglin, C, Butuceanu, P, Carter, S, Chernenko, E, Christy, M, Commisso, J C, Cornejo, S, Covrig, S, Danagoulian, A, Daniel, A, Davidenko, D, Day, S, Dhamija, D, Dutta, R, Ent, S, Frullani, H, Fenker, E, Frlez, F, Garibaldi, D, Gaskell, S, Gilad, R, Gilman, Y, Goncharenko, K, Hafidi, D, Hamilton, D W, Higinbotham, W, Hinton, T, Horn, B, Hu, J, Huang, G M, Huber, E, Jensen, C, Keppel, M, Khandaker, P, King, D, Kirillov, M, Kohl, V, Kravtsov, G, Kumbartzki, Y, Li, V, Mamyan, D J, Margaziotis, A, Marsh, Y, Matulenko, J, Maxwell, G, Mbianda, D, Meekins, Y, Melnik, J, Miller, A, Mkrtchyan, H, Mkrtchyan, B, Moffit, O, Moreno, J, Mulholland, A, Narayan, S, Nedev, Nuruzzaman, E, Piasetzky, W, Pierce, N M, Piskunov, Y, Prok, R D, Ransome, D S, Razin, P, Reimer, J, Reinhold, O, Rondon, M, Shabestari, A, Shahinyan, K, Shestermanov, S, Sirca, I, Sitnik, L, Smykov, G, Smith, L, Solovyev, P, Solvignon, R, Subedi, E, Tomasi-Gustafsson, A, Vasiliev, M, Veilleux, B B, Wojtsekhowski, S, Wood, Z, Ye, Y, Zanevsky, X, Zhang, Y, Zhang, X, Zheng, and L, Zhu

Abstract

Among the most fundamental observables of nucleon structure, electromagnetic form factors are a crucial benchmark for modern calculations describing the strong interaction dynamics of the nucleon's quark constituents; indeed, recent proton data have attracted intense theoretical interest. In this Letter, we report new measurements of the proton electromagnetic form factor ratio using the recoil polarization method, at momentum transfers Q2=5.2, 6.7, and 8.5 GeV2. By extending the range of Q2 for which G(E)(p) is accurately determined by more than 50%, these measurements will provide significant constraints on models of nucleon structure in the nonperturbative regime.

Published
2010

17. New developments and investigations of PSD at JINR, LHE

Author

S. P. Chernenko, S.E. Vasilev, L. Smykov, A.B. Ivanov, T. Netusil, Yu.V. Zanevsky, S. A. Movchan, and G.A. Cheremukhina

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Detector, Neutron, macromolecular substances, Instrumentation, Ion
Abstract

The main parameters and test results of several position-sensitive detectors for investigations by means of soft X-rays, slow neutrons and ions are presented.

Published
1991

18. Dielectron Production inC12+C12Collisions at2A GeVwith the HADES Spectrometer

Author

B. W. Kolb, T. Hennino, C. Gilardi, Jacek Tomasz Otwinowski, D. Magestro, R. Coniglione, A. Ivashkin, E. Schwab, A. Sadovsky, G. Bellia, R. Kotte, A.P. Ierusalimov, F. Dohrmann, Kalliopi Kanaki, J. Friese, T. Wojcik, T. Christ, A. Rustamov, P. Cabanelas, J. A. Garzón, M. Sudol, H. Tsertos, Tatiana Karavicheva, M. Jurkovic, O. V. Fateev, Alexey Kurepin, D. González-Díaz, J. S. Díaz, C. Agodi, M. Jaskula, W. Kühn, M. Suk, Peter Braun-Munzinger, Alberica Toia, Karl Zeitelhack, C. Sturm, C. Schröder, J. L. Boyard, P. Zumbruch, Yu.V. Zanevsky, Andrey Reshetin, H. J. Körner, B. Spruck, D. Vassiliev, W. Schön, V. Pechenov, H. Ströbele, A. Vazquez, T. Eberl, Paolo Finocchiaro, V. T. Smolyankin, M. Kagarlis, Adam Malarz, B. Sailer, A. Taranenko, V. Wagner, C. Fernandez, W. Koenig, I. Iori, Wolfgang Enghardt, Jehad Mousa, Piotr Salabura, M. Ploskon, Witold Przygoda, T. Pérez, E. Lins, A. Nekhaev, H. Alvarez-Pol, S. Lange, Laura Fabbietti, C. Müntz, R.S. Simon, A. Balanda, M. Roy-Stephan, M. Sánchez, D. Zovinec, Paul Kienle, V. Pospíšil, M.B. Golubeva, L. Kidon, Luigi Cosentino, G. Agakichiev, Paolo Sapienza, R. Holzmann, J. Markert, P. Tlusty, M. Traxler, B. Kämpfer, A. M. Schmah, E. Grosse, I. Duran, S. Hlavac, Yvonne Chiara Pachmayer, B. Fuentes, H. Schön, S. Lang, J. Pietraszko, Paolo Piattelli, M. Münch, J. Lehnert, W. Prokopowicz, H. Bokemeyer, B. Ramstein, Jaroslav Bielcik, R. Krücken, Władysław Waluś, S. Spataro, I. Fröhlich, R. Pleskac, J. Stroth, I. Koenig, M. Wiśniowski, J. Homolka, L. Naumann, Jan Novotny, L. Smykov, J. Ritman, S. P. Chernenko, J. Wüstenfeld, D. Bertini, F.F. Guber, M. Böhmer, C. Garabatos, C. Maiolino, Reinhard Kulessa, Roman Gernhäuser, A. Kugler, M. Kajetanowicz, A. Kastenmüller, and V. Metag

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, General Physics and Astronomy, Electron, 7. Clean energy, 01 natural sciences, Omega, Nuclear physics, Particle decay, Pair production, Orders of magnitude (time), 0103 physical sciences, Mass spectrum, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The invariant-mass spectrum of e{sup +}e{sup -} pairs produced in {sup 12}C+{sup 12}C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the {pi}{sup 0}-Dalitz to the {rho}/{omega} invariant-mass region. Dalitz decays of {pi}{sup 0} and {eta} account for all the yield up to 0.15 GeV/c{sup 2}, but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.

Published
2007

19. Parallax-free X-ray area detector with high spatial resolution

Author

S.E. Vasiliev, M. E. Andrianova, S. P. Chernenko, O. V. Fateev, G.A. Cheremukhina, Yu.V. Zanevsky, L. Smykov, S.N. Sulianov, D.M. Kheiker, and D.E. Donets

Subjects
Nuclear and High Energy Physics, Materials science, business.industry, Pixel array, Detector, X-ray, Atomic and Molecular Physics, and Optics, Optics, Liquid crystal, Area detector, High spatial resolution, Parallax, business, Diffractometer
Abstract

The new parallax-free X-ray 2D detector (SD-1000) with the pixel array of 1024 × 1024 has been designed and tested. This detector is the basic element of the X-ray diffractometer which is constructed for the investigation of biological macromolecules, viruses, liquid crystals and powders. The first test results are presented.

Published
1995

20. Pulse height measurements and electron attachment in drift chambers operated with Xe,CO2 mixtures

Author

A Andronic, H Appelshäuser, C Blume, P Braun-Munzinger, D Bucher, O Busch, A.Castillo Ramirez, V Cătănescu, M Ciobanu, H Daues, A Devismes, D Emschermann, O Fateev, C Garabatos, N Herrmann, M Ivanov, T Mahmoud, T Peitzmann, V Petracek, M Petrovici, K Reygers, H Sann, R Santo, R Schicker, S Sedykh, S Shimansky, R.S Simon, L Smykov, H.K Soltveit, J Stachel, H Stelzer, G Tsiledakis, B Vulpescu, J.P Wessels, B Windelband, O Winkelmann, C Xu, O Zaudtke, Yu Zanevsky, and V Yurevich

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Materials science, Detector, Analytical chemistry, Other Fields of Physics, chemistry.chemical_element, FOS: Physical sciences, Electron, Instrumentation and Detectors (physics.ins-det), Oxygen, Quality (physics), chemistry, Electron attachment, Gas chromatography, Instrumentation, Pulse height, Astrophysics::Galaxy Astrophysics
Abstract

We present pulse height measurements in drift chambers operated with Xe,CO2 gas mixtures. We investigate the attachment of primary electrons on oxygen and SF6 contaminants in the detection gas. The measurements are compared with simulations of properties of drifting electrons. We present two methods to check the gas quality: gas chromatography and Fe55 pulse height measurements using monitor detectors., Comment: 19 pages, 16 figures

Published
2003
Full Text
View/download PDF

21. X-ray detectors for structure investigations constructed at JINR

Author

D.M. Kheiker, O. V. Fateev, G.A. Cheremukhina, A. N. Popov, L. Smykov, S. P. Chernenko, Yu.V. Zanevsky, and S.E. Vasiliev

Subjects
Physics, Nuclear and High Energy Physics, business.industry, Detector, X-ray detector, High resolution, High count rate, Optics, Software, Nuclear magnetic resonance, IBM PC compatible, Electronics, business, Instrumentation, Silicon microstrip detectors
Abstract

The performance characteristics of a few high resolution position-sensitive detectors constructed at JINR are presented. The detectors supplied with original software operate with an IBM PC/AT. One of these devices has been succesfully applied for protein molecule structure investigations and the other for studies of the structure-forming process during combustion. The preliminary parameters of the high count rate MWPC with parallel electronics and the testing results of the microstrip detector are given.

Published
1994

22. Automatized One-dimensional X-Ray-Detector

Author

M. Richter, S. P. Chernenko, Yu.V. Zanevsky, L. Smykov, D. Traeber, Vladimir Peshekhonov, G. A. Cheremukina, A.B. Ivanov, and Tran Duc Than

Subjects
Physics, Range (particle radiation), Photon, Physics::Instrumentation and Detectors, business.industry, Detector, X-ray detector, chemistry.chemical_element, General Medicine, Particle detector, Optics, Xenon, chemistry, Nondestructive testing, business, Line (formation)
Abstract

One-dimensional gas-filled X-ray detectors with delay line readout have been developed and tested on line with IBM-PC. The pressure of a xenon (90) and CH4 (10) mixture can be set over a range of 1–10 atm. The position resolution for 8 keV photons is about 170 μm. Main properties and possible applications of the detector are presented.

Published
1990

23. X-ray imaging chamber

Author

G.A. Cheremukhina, Yu. Zanevsky, S. P. Chernenko, and L. Smykov

Subjects
Data processing, Signal processing, Optics, Data acquisition, Materials science, business.industry, X-ray, Electronic engineering, Measuring instrument, Image processing, business, Particle detector
Published
1998

24. Development and investigation of a neutron radiography imaging system with a low-pressure multistep chamber

Author

T. Netusil, L. Moučka, J. Kňourek, L. Smykov, L. Nezmar, Yu.S. Anisimov, V. Bizek, Yu.V. Zanevsky, L. Pellar, Z. Sidak, A.B. Ivanov, Vladimir Peshekhonov, P. Beran, I. Vrba, Z. Zavadil, J. Pochman, K. C̆erný, M. Císar̆, S. P. Chernenko, Z. Schneider, and J. Horác̆

Subjects
Physics, Nuclear and High Energy Physics, medicine.medical_specialty, business.industry, Radiography, Neutron imaging, Detector, Neutron temperature, Full width at half maximum, Optics, Integral nonlinearity, medicine, Neutron, Medical physics, business, Instrumentation, Image resolution
Abstract

An imaging system of thermal neutrons for an investigation of digital neutron radiography has been developed and tested. Some characteristics obtained on a neutron radiography beam of an experimental reactor are reported. The coordinates of each event are determined in this system. After processing in a LSI 1123 computer, a radiograph, accumulated in a histogramming memory of 64 K 16-bit words, is presented on a colour display. A 230 × 180 mm2 low-pressure multistep chamber is used as a detector. Neutron conversion takes place in a 6 μm boron layer enriched to 86% in 10B. The detection efficiency of thermal neutrons is no less than 3%. The count rate of the system reaches up to 2 × 105 events per second. A radiograph can be obtained within 10 minutes. The sensitivity of this system to gamma-background is low. One event/s is detected for a background of 1 R/h. The spatial resolution is found to be 0.7 mm (FWHM) using a cadmium knife edge. The integral nonlinearity is less than 0.4%. The possibility of using a hydrogeneous converter in this system for neutron radiography is discussed.

Published
1988

25. Recent progress in developments and applications of imaging detectors at LHE, JINR

Author

A.B. Ivanov, Yu.V. Zanevsky, Vladimir Peshekhonov, L. Smykov, T. Netusil, S. A. Movchan, S. P. Chernenko, G.A. Cheremukhina, S.E. Vasilev, and Chan Dyk Tkhan

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Wire chamber, Physics::Instrumentation and Detectors, Beta (plasma physics), Detector, equipment and supplies, Instrumentation, Neutron temperature
Abstract

Data on the development and investigation of position-sensitive detectors performed at the Laboratory of High Energies, JINR for X-ray structural studies and in beta autoradiography are presented. The parameters of the position-sensitive detectors of thermal neutrons with a high-pressure multiwire proportional chamber and a low-pressure multistep chamber are described. The characteristics of the imaging detector with a CCD matrix which is being developed are discussed.

Published
1989

26. A Device with a Low-Pressure Multistep Avalanche Chamber for Neutron Radiography

Author

A.B. Ivanov, J. Kňourek, Yu.V. Zanevsky, Yu.S. Anisimov, L. Smykov, Vladimir Peshekhonov, T. Netusil, L. Moučka, S. P. Chernenko, and L. Pellar

Subjects
Physics, Wire chamber, Physics::Instrumentation and Detectors, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Neutron imaging, Nuclear Theory, Radiochemistry, General Medicine, Nuclear reactor, Neutron temperature, Particle detector, law.invention, Optics, Townsend discharge, law, Neutron detection, Neutron, Nuclear Experiment, business
Abstract

A device with a low-pressure multistep avalanche chamber for thermal neutron imaging was developed and tested on a neutronographic beam of the nuclear reactor. The device operates on-line with a minicomputer. The detection efficiency of thermal neutrons is better than 3%, while the detection efficiency of 60 keV γ-quanta is less than 10−6.

Published
1987

28. A device for neutron radiography with a low-pressure multistep avalanche chamber

Author

L. Pellar, A.B. Ivanov, L. Smykov, Yu.V. Zanevsky, T. Netusil, L. Moučka, Vladimir Peshekhonov, Yu.S. Anisimov, J. Kňourek, and S. P. Chernenko

Subjects
Physics, Nuclear and High Energy Physics, medicine.medical_specialty, business.industry, Neutron imaging, Particle detector, Neutron temperature, Optics, Measuring instrument, medicine, Neutron detection, Medical physics, Neutron, business, Instrumentation, Microelectronic circuits
Published
1986

29. 39925 Development and investigation of a neutron radiography imaging system with a low-pressure multistep chamber

Author

K. Cerny, J. Horacek, Z. Schneider, Yu.V. Zanevsky, Z. Sidak, S. P. Chernenko, Vladimir Peshekhonov, L. Pellar, A.B. Ivanov, J. Knourek, V. Bizek, Z. Zavadil, J. Pochman, L. Smykov, L. Moučka, Yu.S. Anisimov, P. Beran, M. Císar̆, I. Vrba, T. Netusil, and L. Nezmar

Subjects
Materials science, business.industry, Neutron imaging, Nuclear engineering, General Engineering, Nuclear medicine, business
Published
1989

Catalog

Books, media, physical & digital resources
See catalog results