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1. STRELA experimental setup for studying charge-exchange processes

Author

J. Urbán, N. M. Piskunov, G. Martinská, J. Mušinský, V. V. Glagolev, and D. A. Kirillov

Subjects
Nuclear physics, Physics, Momentum, Nuclotron, Range (particle radiation), Deuterium, Spectrometer, Physics::Instrumentation and Detectors, Nuclear Experiment, Instrumentation, Image resolution, Beam (structure), Charge exchange
Abstract

The STRELA experimental setup designed for studying charge-exchange processes in deuteron-proton collisions at energies above 1 GeV is described. The setup is a one-arm magnetic spectrometer the main elements of which are drift chambers. The setup has been tested by irradiation in a deuteron beam with a momentum of 3.5 GeV/c at the Nuclotron accelerator complex (Laboratory of High Energy Physics, Joint Institute for Nuclear Research (JINR)). Algorithms for track searching and reconstruction in drift chambers have been developed and tested using real events. The attained spatial resolution of the chambers is in the range of 90–120 μm, which is sufficient for studying the process we are interested in.

Published
2013

2. Экспериментальная установка 'Стрела' для изучения зарядово-обменных процессов

Author

J. Urbán, G. Martinská, and J. Mušinsk

Subjects
Instrumentation
Abstract

Описывается экспериментальная установка “Стрела”, предназначенная для исследования зарядово-обменных процессов в дейтрон-протонных столкновениях в области энергий выше 1 ГэВ. Установка представляет собой одноплечевой магнитный спектрометр, основными элементами которого являются дрейфовые камеры. Было проведено тестовое облучение в пучке дейтронов с импульсом 3.5 ГэВ/с на ускорительном комплексе “Нуклотрон” ЛФВЭ ОИЯИ. Разработаны и протестированы на реальных событиях алгоритмы для поиска и реконструкции треков в дрейфовых камерах. Полученное значение пространственного разрешения камер лежит в диапазоне 90–120 мкм, что позволяет осуществить изучение интересующего нас процесса.

Published
2013

3. Energy dependence of hyperon production in nucleus–nucleus collisions at SPS

Author

I. J. Bloodworth, K. Šafařík, A. Jusko, P.A. Bacon, N. Carrer, A. Jacholkowski, P van de Ven, Giuseppe Bruno, P. Jovanovic, W. Snoeys, Dieter Røhrich, L. Šándor, Marek Bombara, P.C. de Rijke, Håvard Helstrup, R. Kamermans, M.F. Votruba, Federico Antinori, J. Urban, A. Vascotto, F.F. Valiev, G.S. Pappalardo, V. Lenti, A.K. Holme, M. Morando, N. Pišútová, F. Soramel, O. Villalobos Baillie, B. Ghidini, M. A. Mazzoni, V. P. Kondratiev, Rocco Caliandro, Adela Kravcakova, F. Posa, Roman Lietava, A. Belogianni, A.P. de Haas, E Quercigh, A. Palmeri, Andrea Dainese, G Martinská, M. Sené, P. Vande Vyvre, F. Navach, Anatoly Kolozhvari, Davide Elia, R. Turrisi, Leonid Vinogradov, Kristin Fanebust Hetland, M. Campbell, Franco Meddi, A. van den Brink, J. Pišút, K. Knudson, Ivan Kralik, Trine Spedstad Tveter, Francesco Riggi, T.A. Toulina, Vito Manzari, E. Schillings, Tiziano Virgili, D. Evans, N. van Eijndhoven, Pavel Staroba, P. G. Kuijer, Roberto Divia, Janka Vrlakova, P.I. Norman, G. T. Jones, M. Spyropoulou-Stassinaki, Anju Bhasin, G. A. Feofilov, E. Nappi, Wisla Carena, D. Di Bari, S A Bull, G. Romano, R. Sené, J. van Hunen, Petr Zavada, J.B. Kinson, Paraskevi Ganoti, S. Di Liberto, B. Pastirčák, Gunnar Løvhøiden, G.F. Segato, Roberto Barbera, Angela Badala, R. A. Fini, A. Michalon, T. Vik, R. F. Clarke, G. Grella, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), NA57, and Heyd, Yvette

Subjects
PB-PB COLLISIONS, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, FOS: Physical sciences, Hyperons, Lambda baryon, Xi baryon, Nuclear physics, Nuclear Physics - Experiment, Rapidity, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, High Energy Physics::Phenomenology, Hyperon, NA57, CERN SPS, Omega baryon, [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Baryon, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Antimatter, Quark–gluon plasma, High Energy Physics::Experiment, Quark Gluon Plasma, PB+PB COLLISIONS
Abstract

A measurement of strange baryon and antibaryon production in Pb-Pb collisions has been carried out by the NA57 experiment at the CERN SPS, with 40 and 158 A GeV/c beam momentum. Results on $\Lambda$, $\Xi$ and $\Omega$ hyperon yields at mid-rapidity in the most central 53% of Pb-Pb collisions at 40 A GeV/c are presented and compared with those obtained at higher energy, in the same collision centrality range. The $\Lambda$ and $\Xi^-$ yields per unit rapidity stay roughly constant while those of $\Omega^-$, $\bar\Lambda$, $\bar\Xi^+$ and $\bar\Omega^+$ increase when going to the higher SPS energy. Hyperon yields at the SPS are compared with those from the STAR experiment in $\sqrt{s_{NN}}$ = 130 GeV Au-Au collisions at RHIC., Comment: 9 pages, 4 figures, 3 tables, accepted for publication in Physics Letters B

Published
2004

4. Hyperon yields in PbPb collisions from NA57 experiment

Author

S. Di Liberto, Paraskevi Ganoti, Roberto Barbera, A. Vascotto, Haavard Helstrup, M. Sené, M. Campbell, F. Posa, Roman Lietava, M. Morando, Pavel Staroba, Roberto Divia, Francesca Soramel, M. Henriquez, Davide Elia, M. A. Mazzoni, B. Ghidini, A. Belogianni, E Quercigh, J.B. Kinson, P.C. de Rijke, Anju Bhasin, G. A. Feofilov, Petr Zavada, Trine Spedstad Tveter, A. Palmeri, David H. Evans, J. Urban, Giacomo Bruno, E. Nappi, Vito Manzari, N. Pisˇútova, R. Sené, G. Martinská, J. Pisˇút, G.F. Segato, P.I. Norman, G. T. Jones, K. Knudson, S A Bull, F. Fayazzadeh, V. Lenti, N Carrer, Anatoly Kolozhvari, Francesco Riggi, J. van Hunen, Wisla Carena, A.K. Holme, G.S. Pappalardo, I. J. Bloodworth, L. Sˇándor, Leonid Vinogradov, O. Villalobos Baillie, A. van den Brink, V. P. Kondratiev, P. Vande Vyvre, G. Romano, A. Jusko, R. Turrisi, Andrea Dainese, A. Kravcˇáková, G. Grella, P. G. Kuijer, E. Schillings, P. van den Ven, B. Pastircˇák, N. van Eijnhoven, Dieter Røhrich, Rocco Caliandro, T.A. Toulina, A. Badalà, Ivan Kralik, T. Vik, F.F. Valiev, R. F. Clarke, Federico Antinori, R. Kamermans, M.F. Votruba, J. Fedorisˇin, Gunnar Løvhøiden, F. Navach, A.P. de Haas, M. Spyropoulou-Stassinaki, Franco Meddi, Tiziano Virgili, R. A. Fini, A. Michalon, P. Jovanovic, K. Fanebust, K. Sˇafarˇík, D. Di Bari, Janka Vrlakova, A. Jacholkowski, and W. Snoeys

Subjects
Physics, Nuclear and High Energy Physics, Hyperon, Humanities
Abstract

F. Antinori’, A. Bada&‘, R. Barberag, A. Belogiannia, A. Bhasine, I.J. Bloodworthe, G.E. Bruno*, S.A. Bulle, R. Caliandro*, M. Campbellh, W. Carenah, N. Carrerh, R.F. Clarkee, A. Dainese’, A.P. de Haa.9, P.C. de Rijkes, D. Di Bari*, S. Di Liberto’, R. Diviah, D. Elia*, D. Evanse, K. Fanebus@, F. Fayazzadeh”, J. Fedorisin j, G.A. Feofilov*, R.A. Fini*, P. Ganotia, B. Ghidini*, G. Grellap, H. Helstrupd, M. Henriquez”, A.K. Holmek, A. Jacholkowski*, G.T. Jonese, P. Jovanovice, A. Juskoi, R. KamermansS, J.B. Kinsone, K. Knudsonh, A.A. Kolozhvariq, V. Kondratiev ‘3, I. Kr&liki, A. KravEBkova*, P. Kuije?, V. Lenti*, R. Lietavae, G. Lovhoiden”, V. Manzari*, G. Martinskaj, M.A. MazzoniO, F. Meddi’, A. Michalonr, M. Morando’, E. Nappi*, F. Navach*, P.I. Normane, A. Palmeris, G.S. Pappalardog, B. PastirE&ki, J. Pi&, N. Pisutovaf, F. Posa*, E. Quercigh’, F. Rig@, D. RGhrich’, G. RomanoP, K. Safafikh, L. SBndo$‘, E. Schillin&, G. Segato’, M. SenCm, R. Sent?, W. Snoeysh, F. Soramel’, M. Spyropoulou-Stassinaki ‘, P. Staroba”, T.A. ToulinaQ, R. Turrisi’, T.S. Tveterk, J. Urbinj, F. Valievq, A. van den Brinks, P. van de Ven’, P. Vande Vyvreh, N. van Eijndhovens, J. van Hunenh, A. Vascottoh, T. Vik”, 0. Villalobos Bailliee, L. Vinogradovq, T. Virgil?‘, M.F. Votrubae, J. Vrlikovd and P. Zavadan

Published
2003

5. Spin-dependent np → pn amplitude estimated from dp → ppn

Author

J. Mušinský, M. S. Khvastunov, J. Hlavacova, B. Pastirčák, G. Martinská, T. Siemiarczuk, N. B. Ladygina, N.M. Piskunov, J. Urban, and V. V. Glagolev

Subjects
Physics, Nuclear and High Energy Physics, Proton, Nuclear Theory, Hadron, Nuclear physics, Amplitude, Deuterium, Nuclear fusion, Atomic physics, Nuclear Experiment, Nucleon, Charge exchange, Spin-½
Abstract

An estimation of the spin-dependent part of the np↦pn charge exchange amplitude was made on the basis of dp↦(pp)n data, taken at 1.67 GeV/c per nucleon in a full solid-angle arrangement. The np↦pn amplitude turned out to be entirely spin-dependent. This result shows new possibilities for experiments using polarized deuteron beams and polarized proton targets.

Published
2002

6. Mean free path of Z=2 nuclei from 3Hep interactions in liquid hydrogen

Author

G. Martinská, G. D. Pestova, T. Siemiarczuk, W. Wiślicki, V. V. Glagolev, J. Urban, M. Kravcikova, R.M. Lebedev, and L. Šándor

Subjects
Nuclear physics, Physics, Momentum, Nuclear and High Energy Physics, Cross section (physics), Mean free path, Atomic physics, Atomic and Molecular Physics, and Optics, Liquid hydrogen
Abstract

Results are presented for the total and the apparent cross section measured in 3Hep interactions at an incident momentum of 8.0 GeV/c and for an anomalously short mean free path of Z=2 secondary nuclei from these interactions. About 14000 Z=2 nuclei leading to 2319 secondary interactions are studied. An admixture of 0.5% of anomalons is found with a mean free path of 1.5 cm to be compared with around 250 cm for primary interactions. Our results are compared with other data from the interactions of He nuclei with protons at various energies.

Published
2001

7. Status of the NA57 experiment at CERN SPS

Author

F.F. Valiev, V. Lenti, Michael A. Thompson, Giuseppe Bruno, A. van den Brink, Pavel Staroba, N. Carrer, Franco Meddi, Francesco Riggi, G Martinská, M. Henriquez, B Pastir, M. Morando, R. Kamermans, W. Klempt, J Urb, E. Schillings, L. Vannucci, Wisla Carena, Jan Pisut, I. J. Bloodworth, Marisa Gulino, Vito Manzari, A. Jacholkowski, K. Fanebust, J. Fedorisin, P.I. Norman, G. T. Jones, W. Snoeys, Tiziano Virgili, Federico Antinori, M Lupt, I. Vinogradov, A Badal, A. Vascotto, Haavard Helstrup, P. G. Kuijer, F. Fayazzadeh, A.P. de Haas, K. Knudson, Rocco Caliandro, M. Campbell, Davide Elia, Janka Vrlakova, P. Jovanovic, P. Vande Vyvre, R. Turrisi, A. K. Holme, J.B. Kinson, R. Lietava, A. Palmeri, Roberto Barbera, R. A. Fini, A. Michalon, E. Nappi, G.F. Segato, E. Quercigh, M.E. Michalon-Mentzer, Eugenio Cantatore, M. A. Mazzoni, G. Grella, G.S. Pappalardo, O. Villalobos Baillie, V. P. Kondratiev, D. Muigg, and M Sen

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Antimatter, Nuclear Theory, Hyperon, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The NA57 experiment aims to investigate the production of strange and multistrange particles in nucleus–nucleus collisions at CERN SPS. NA57 has been +

Published
2001

8. Analysis of the spectator-angular distribution in the light-nuclei reactions

Author

G. Martinská, J. Hlavacova, V. V. Glagolev, A. Dirner, N. B. Ladygina, and J. Urban

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Light nucleus, Angular distribution, Nuclear Theory, Hadron, Nuclear fusion, Flux, Particle, Atomic physics, Nuclear Experiment, Wave function
Abstract

Angular distributions of spectator particles in dp and 4Hep reactions in the region of a few GeV have been studied. Significant asymmetries of the spectator particle distributions have been observed for reactions where π-mesons are produced in the final state. Results of calculations in the framework of a spectator model taking into account the nuclear wave function, flux factor and the energy dependence of the NN elementary cross-sections, have been compared to experimental data. A good agreement has been observed for the fragments momenta, where the one-pole mechanism dominates.

Published
2000

9. Self-similar properties of collisions between light nuclei

Author

G. Martinská, M. Vytykáčová, J. Urban, V. V. Glagolev, and J. Hlavacova

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Light nucleus, Fragmentation (mass spectrometry), Nuclear Theory, Binding energy, Nuclear Experiment, Atomic and Molecular Physics, and Optics
Abstract

A new way of representing data on the fragmentation of nuclei is suggested. The self-similar behavior of these processes, that is dictated by their kinematics, is demonstrated. The convenience of working in accelerated nuclei is emphasized, particularly for the determination of the binding energy of a wide class of nuclear fragments.

Published
2000

10. Δisobar production in the4He p3H pnπ+reaction

Author

M. S. Nioradze, J. Urban, G. D. Pestova, T. Siemiarczuk, J. Hlavacova, K. U. Khairetdinov, M. Vytykáčová, A.K. Kacharava, G. Martinská, N. B. Ladygina, V. V. Glagolev, A. Dirner, R.M. Lebedev, A. G. Mamulashvili, M. S. Khvastunov, and B. Pastirčák

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Isobar
Published
1999

11. The deuteron D-state probability

Author

G. Martinská, G. D. Pestova, A.K. Kacharava, L. Šándor, M. S. Nioradze, K. U. Khairetdinov, T. Siemiarczuk, V. V. Glagolev, J. Hlávčová, A. G. Mamulashvili, J. Urban, S. Shimanskyi, B. Pastirčák, L. V. Kosticina, and R.M. Lebedev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Deuterium, Nuclear Theory, Nuclear fusion, Nuclear Experiment, Nucleon, Steady state probability, Polarization (waves)
Abstract

A method of direct determination of the deuteron D-state probability from the experiment, based on the d ↑ p → ppn reaction analyzis is suggested. Using the known results on the vector analyzing power in elastic NN-scattering, the values of the overall nucleon polarization and the deuteron vector polarization have been obtained. The probability of the deuteron D-state is estimated to be w D = 0.078 ± 0.046.

Published
1996

12. Hyperon yields in PbPb collisions from the NA57 experiment

Author

A. Badalà, V. P. Kondratiev, R. A. Fini, J. van Hunen, A. Michalon, K. Knudson, Anju Bhasin, G. A. Feofilov, T.A. Toulina, O. Villalobos-Baillie, Petr Zavada, P.C. de Rijke, Trine Spedstad Tveter, Pavel Staroba, Ivan Kralik, Roberto Divia, P. Vande Vyvre, Haavard Helstrup, V. Lenti, W. Snoeyes, R. Turrisi, G. Martinská, M.F. Votruba, S A Bull, F. Posa, Roman Lietava, N. van Eijndhoven, P. Jovanovic, Andrea Dainese, M. Morando, J. Pišút, P.I. Norman, B. Ghidini, G. T. Jones, P. van den Ven, K. Šafařík, Franco Meddi, J.B. Kinson, Roberto Barbera, J. Urban, Anatoly Kolozhvari, M. Henriquez, K. Fanebust, A. Jusko, Gunnar Løvhøiden, G. Romano, F.F. Valiev, Tiziano Virgili, Rocco Caliandro, Giacomo Bruno, I. J. Bloodworth, G.F. Segato, D. Di Bari, Davide Elia, R. Sené, Vito Manzari, A. Belogianni, M. A. Mazzoni, E Quercigh, L. Šándor, A. Palmeri, M. Sené, M. Campbell, P. G. Kuijer, David H. Evans, A. Vascotto, Paraskevi Ganoti, Francesca Soramel, F. Fayazzadeh, D. Röhrich, E. Nappi, A. van den Brink, Federico Antinori, M. Spyropoulou-Stassinaki, J. Fedorisin, Adela Kravcakova, A.P. de Haas, S. Di Liberto, R. Kammermans, B. Pastirčák, Janka Vrlakova, A. Jacholkowski, F. Navach, Wisla Carena, T. Vik, R. F. Clarke, N Carrer, Francesco Riggi, G. Grella, A.K. Holme, N. Pišútová, Leonid Vinogradov, E. Schillings, and G.S. Pappalardo

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Large Hadron Collider, Nuclear Theory, Hyperon, Strangeness, Collision, Interaction volume, Atomic and Molecular Physics, and Optics, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract

The new results on hyperon production in Pb-Pb collisions at 158 A GeV/c and 40 A GeV/c are presented. Publisher Summary This chapter discusses the yields of hyperon in Pb–Pb collisions from the NA57 experiment. The aim of NA57 was to study the dependence of the strangeness enhancement on the interaction volume and the collision energy per incoming nucleon. The centrality range of the NA57 experiment extended down to a limit of about 50 wounded nucleons. The experiment collected data using 158 and 40 A GeV/c beams at the CERN SPS. There was indication of an increase of the enhancements with the centrality of the collisions. The data were corrected for acceptance and efficiency losses by calculating weight for each particle with a GEANT-based Monte-Carlo simulation.

Published
2003

13. Proton-proton and deuteron-deuteron correlations in interactions of relativistic helium nuclei with protons

Author

L. Šándor, M. S. Nioradze, M. Bano, J. Patocka, R.M. Lebedev, J. Stepaniak, J. Urban, J. Gałazka-Friedman, Z. Salukvadze, I. P. Zieliński, M. Seman, K. U. Khairetdinov, V. V. Glagolev, T. Sobczak, J. Hlavacova, G. D. Pestova, A.K. Kacharava, G. Martinská, and S. S. Shimanskiy

Subjects
Physics, Nuclear reaction, Nuclear physics, Baryon, Nuclear and High Energy Physics, Correlation function, Deuterium, Proton, Hadron, Atomic physics, Nucleon, Charged particle
Abstract

The reactions4Hep →pp+X,3Hep →pp+X and4Hep →ddp have been investigated and the correlation function has been measured for protons and deuterons with small relative momenta. Strong positive correlation has been observed for protons related mainly to the final state interactions in1S0 state. The root mean square radius of the proton source calculated from the correlation function has been found to be equal to (1.7±0.3) fm and (2.1±0.3) fm for4He and3He respectively. It agrees with the known radii of these nuclei.

Published
1993

14. Multiplicity of charged particles in Pb-Pb collisions at SPS energies

Author

G. Martinská, D. Di Bari, A.K. Holme, N. Pišútová, M. Morando, I. J. Bloodworth, A. Badalà, B. Ghidini, N. van Eijndhoven, N Carrer, Giuseppe Bruno, M. A. Mazzoni, F. Navach, Leonid Vinogradov, M. Sené, Kristin Fanebust Hetland, G. Romano, M. Campbell, E. Schillings, R. Platt, Anatoly Kolozhvari, G. Grella, T.A. Toulina, J. Urban, Gunnar Løvhøiden, Dieter Røhrich, A. Jacholkowski, Ivan Kralik, Vito Manzari, D. Evans, Janka Vrlakova, R. A. Fini, P. G. Kuijer, Karel Safarik, A. Michalon, Anju Bhasin, Franco Meddi, R. Kamermans, M.F. Votruba, G. A. Feofilov, W. Snoeys, A. van den Brink, M Bombara, G.F. Segato, A Jacholkowski, Pavel Staroba, Roberto Divia, A. Jusko, A. Belogianni, E Quercigh, E. Nappi, A. Palmeri, J.B. Kinson, P van de Ven, G.S. Pappalardo, O. Villalobos Baillie, V. P. Kondratiev, Håvard Helstrup, Petr Zavada, J. van Hunen, T. Vik, R. F. Clarke, Adela Kravcakova, P. Jovanovic, A. Vascotto, Tiziano Virgili, Trine Spedstad Tveter, Federico Antinori, S A Bull, Francesca Soramel, K. Knudson, P.I. Norman, G. T. Jones, A.P. de Haas, F. Posa, Roman Lietava, Francesco Riggi, Davide Elia, F.F. Valiev, S. Di Liberto, Rocco Caliandro, B. Pastirčák, M. Spyropoulou-Stassinaki, Roberto Barbera, Andrea Dainese, P. Vande Vyvre, R. Turrisi, J. Pišút, P.A. Bacon, V. Lenti, Paraskevi Ganoti, P.C. de Rijke, L Síndor, Wisla Carena, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), NA57, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
History, Nuclear and High Energy Physics, Particle physics, FOS: Physical sciences, Venus, 01 natural sciences, 7. Clean energy, Education, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Rapidity, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Physics, Large Hadron Collider, biology, 010308 nuclear & particles physics, biology.organism_classification, Charged particle, Computer Science Applications, High Energy Physics::Experiment, Nucleon, Particle Physics - Experiment
Abstract

The multiplicity of charged particles in the central rapidity region has been measured by the NA57 experiment in Pb--Pb collisions at the CERN SPS at two beam momenta: 158 A GeV/{\it c} and 40 A GeV/{\it c}. The value of $dN_{ch}/d\eta$ at the maximum has been determined and its behaviour as a function of centrality has been studied in the centrality range covered by NA57 (about 50% of the inelastic cross section). The multiplicity increases approximately logarithmically with the centre of mass energy., Comment: 19 pages, 8 figures

Published
2005

15. Hyperon production at the CERN SPS: results from the NA57 experiment

Author

T.A. Toulina, Anju Bhasin, G. A. Feofilov, A. Belogianni, G.S. Pappalardo, O. Villalobos Baillie, A. Palmeri, V. P. Kondratiev, T. Vik, Anatoly Kolozhvari, Trine Spedstad Tveter, R. F. Clarke, F. Soramel, Gunnar Løvhøiden, Rosario Turrisi, K. Knudson, M. Spyropoulou-Stassinaki, N Carrer, Roberto Barbera, R. A. Fini, A.K. Holme, N. Pišútová, A. Michalon, F. Navach, A. Badalà, P.I. Norman, G. T. Jones, M. Morando, Haavard Helstrup, G. Grella, Francesco Riggi, D. Di Bari, B. Ghidini, D. Evans, F. Posa, Roman Lietava, Petr Zavada, Pavel Staroba, Federico Antinori, S. Di Liberto, P. Jovanovic, K. Fanebust, Wisla Carena, B. Pastirčák, Roberto Divia, G.F. Segato, Rocco Caliandro, Leonid Vinogradov, N. van Eijndhoven, E. Quercigh, Ivan Kralik, A.P. de Haas, E. Schillings, P.A. Bacon, M. A. Mazzoni, Franco Meddi, Adela Kravcakova, E. Nappi, Paraskevi Ganoti, Davide Elia, P.C. de Rijke, A. van den Brink, Janka Vrlakova, P. G. Kuijer, A. Jacholkowski, W. Snoeys, L. Šándor, Tiziano Virgili, F. Fayazzadeh, Andrea Dainese, J.B. Kinson, M. Sené, A. Vascotto, M. Campbell, F.F. Valiev, J. Urban, G. Romano, M. Henriquez, J. van Hunen, G Martinská, P. Vande Vyvre, S A Bull, R. Sené, J. Pišút, V. Lenti, Vito Manzari, I. J. Bloodworth, Giuseppe Bruno, Dieter Røhrich, R. Kamermans, M.F. Votruba, K. Šafařík, M Bombara, A. Jusko, and P van de Ven

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Nuclear Theory, Hadron, Hyperon, Elementary particle, Xi baryon, Nuclear physics, Baryon, Antimatter, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract

New results on strange baryon and antibaryon production in Pb-Pb collisions at 40 and 160 GeV per nucleon are presented. In particular, we have increased significantly the statistics of the Ξ - and Ξ + samples at 160 GeV per nucleon. The dependence of particle yields and spectra on collision centrality and energy of interaction is analysed.

Published
2004

16. Hyperon production in 40 A GeV/c collisions from the NA57 experiment

Author

Anju Bhasin, G. A. Feofilov, M. Henriquez, P. Vande Vyvre, R. Turrisi, L. Šándor, J. Urban, J. Pišút, Roberto Barbera, F. Navach, A. Vascotto, Haavard Helstrup, J. van Hunen, A. Badalà, K. Knudson, Francesca Soramel, F. Posa, Roman Lietava, Vito Manzari, G.S. Pappalardo, Anatoly Kolozhvari, O. Villalobos Baillie, V. P. Kondratiev, T. Vik, Gunnar Løvhøiden, R. F. Clarke, Petr Zavada, A. van den Brink, Davide Elia, Rocco Caliandro, I. J. Bloodworth, D. Evans, Ivan Kralik, Trine Spedstad Tveter, S. Di Liberto, B. Pastirčák, P. G. Kuijer, R. A. Fini, Pavel Staroba, R. Sené, J. Fedorisin, Adela Kravcakova, A. Michalon, N Carrer, A. Belogianni, M. A. Mazzoni, Francesco Riggi, P.I. Norman, G. T. Jones, Roberto Divia, P.C. de Rijke, G.F. Segato, E Quercigh, M. Morando, Dieter Røhrich, P. Jovanovic, K. Fanebust, G. Grella, A. Palmeri, B. Ghidini, Leonid Vinogradov, Paraskevi Ganoti, E. Nappi, Wisla Carena, J.B. Kinson, F.F. Valiev, M. Sené, V. Lenti, R. Kamermans, M.F. Votruba, M. Campbell, E. Schillings, Federico Antinori, G Martinská, S A Bull, M. Spyropoulou-Stassinaki, A.P. de Haas, G. Romano, Franco Meddi, Tiziano Virgili, A.K. Holme, N. Pišútová, A. Jusko, P van de Ven, Giuseppe Bruno, D. Di Bari, Karel Safarik, A. Jacholkowski, W. Snoeys, T.A. Toulina, F. Fayazzadeh, Janka Vrlakova, N. van Eijndhoven, and Andrea Dainese

Subjects
Baryon, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Nuclear Theory, Hyperon, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Enhancements of strange baryon and anti-baryon yields were first observed in Pb–Pb interactions at 160 A GeV/c by WA97. The aim of the NA57 experiment is to investigate how these enhancements behave as a function of energy, and over a broader centrality range than that which was available with WA97. This paper presents a comparison of the hyperon yields in Pb–Pb interactions at 40 A GeV/c and 160 A GeV/c. Preliminary signals for the p-Be data at 40 A GeV/c are also shown.

Published
2004

17. Hyperon production in lead-lead interactions at 40 and 160 A GeV/c

Author

T. Vik, R. F. Clarke, N Carrer, Francesco Riggi, G. Grella, A. Badalà, L. Šándor, R. Kamermans, G.S. Pappalardo, M.F. Votruba, Giuseppe Bruno, V. Lenti, A. Vascotto, A. Belogianni, O. Villalobos Baillie, V. P. Kondratiev, E Quercigh, Franco Meddi, Francesca Soramel, M. Sené, M. Campbell, E. Nappi, I. J. Bloodworth, P.A. Bacon, F.F. Valiev, A. Palmeri, Anju Bhasin, Anatoly Kolozhvari, J. Urban, A. van den Brink, G. A. Feofilov, A.K. Holme, Davide Elia, Leonid Vinogradov, M. A. Mazzoni, S A Bull, Dieter Røhrich, D. Evans, K. Šafařík, Trine Spedstad Tveter, R. Sené, M Bombara, N. van Eijndhoven, G Martinská, Ivan Kralik, N. Pišútová, Tiziano Virgili, E. Schillings, A. Jusko, F. Navach, P van de Ven, P.I. Norman, G. T. Jones, P.C. de Rijke, Andrea Dainese, Wisla Carena, M. Spyropoulou-Stassinaki, Petr Zavada, Pavel Staroba, Roberto Divia, J. van Hunen, T.A. Toulina, Federico Antinori, J.B. Kinson, Rocco Caliandro, A.P. de Haas, Vito Manzari, G. Romano, M. Morando, B. Ghidini, P. Vande Vyvre, R. Turrisi, P. G. Kuijer, J. Pišút, Janka Vrlakova, K. Knudson, D. Di Bari, Haavard Helstrup, A. Jacholkowski, G.F. Segato, W. Snoeys, F. Posa, Roman Lietava, P. Jovanovic, K. Fanebust, Adela Kravcakova, Gunnar Løvhøiden, R. A. Fini, A. Michalon, Roberto Barbera, S. Di Liberto, B. Pastirčák, Paraskevi Ganoti, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and NA57

Subjects
Physics, Physics and Astronomy (miscellaneous), Nuclear Theory, Hadron, Hyperon, Elementary particle, Fermion, Strangeness, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Baryon, Nuclear physics, Antimatter, Transverse mass, Nuclear Experiment, Engineering (miscellaneous)
Abstract

The NA57 experiment has measured strange baryon and antibaryon production in Pb-Pb collisions at 40 A GeV/c and 160 A GeV/c beam momenta. This presentation covers strangeness enhancement and transverse spectra from the 160 A GeV/c data, and energy dependence of the particle yields. Enhancement factors increase with increasing strangeness content of the particle, when production yields from Pb-Pb collisions are compared with those observed in p-Be and p-Pb interactions. The transverse mass spectra have been analysed both with exponential fits and using a transverse flow model.

Published
2003

18. Hyperon yields in Pb-Pb collisions from NA57 experiment

Author

Manzari, V. Antinori, F. Badalà, A. Barbera, R. Belogianni, A. Bhasin, A. Bloodworth, I.J. Bruno, G.E. Bull, S.A. Caliandro, R. Campbell, M. Carena, W. Carrer, N. Clarke, R.F. Dainese, A. De Haas, A.P. De Rijke, P.C. Di Bari, D. Di Liberto, S. Divia, R. Elia, D. Evans, D. Fanebust, K. Fayazzadeh, F. Fedorišin, J. Feofilov, G.A. Fini, R.A. Ganoti, P. Ghidini, B. Grella, G. Helstrup, H. Henriquez, M. Holme, A.K. Jacholkowski, A. Jones, G.T. Jovanovic, P. Jusko, A. Kamermans, R. Kinson, J.B. Knudson, K. Kolozhvari, A.A. Kondratiev, V. Králik, I. Kravčáková, A. Kuijer, P. Lenti, V. Lietava, R. Løvhøiden, G. Martinská, G. Mazzoni, M.A. Meddi, F. Michalon, A. Morando, M. Nappi, E. Navach, F. Norman, P.I. Palmeri, A. Pappalardo, G.S. Pastirčák, B. Pišút, J. Pišútova, N. Posa, F. Quercigh, E. Riggi, F. Röhrich, D. Romano, G. Šafařík, K. Šándor, L. Schillings, E. Segato, G. Sené, M. Sené, R. Snoeys, W. Soramel, F. Spyropoulou-Stassinaki, M. Staroba, P. Toulina, T.A. Turrisi, R. Tveter, T.S. Urbán, J. Valiev, F. Van Den Brink, A. Van De Ven, P. Vande Vyvre, P. Van Eijndhoven, N. Van Hunen, J. Vascotto, A. Vik, T. Villalobos Baillie, O. Vinogradov, L. Virgili, T. Votruba, M.F. Vrláková, J. Závada, P.

Abstract

We report results from the experiment NA57 at CERN SPS on hyperon yields at midrapidity in Pb-Pb collisions at 158 A GeV/c and 40 A GeV/c. Λ, and Ω yields are compared with preliminary results from the STAR experiment at BNL. © 2003 Elsevier Science B.V. All rights reserved.

Published
2003

19. Hyperon yields in Pb-Pb collisions from the NA57 experiment

Author

F. Antinori, A. Badalà, R. Barbera, A. Belogianni, A. Bhasin, I.J. Bloodworth, G.E. Bruno, S.A. Bull, R. Caliandro, M. Campbell, W. Carena, N. Carrer, R.F. Clarke, A. Dainese, A.R. de Haas, RC. de Rijke, D. Di Bari, S. Di Liberto, R. Divia, D. Elia, D. Evans, K. Fanebust, F. Fayazzadeh, J. Fedoriŝin, G.A. Feofilov, R.A. Fini, P. Ganoti, B. Ghidini, G. Grella, H. Helstrup, M. Henriquez, A.K. Holme, A. Jacholkowski, G.T. Jones, P. Jovanović, A. Jusko, R. Kammermans, J.B. Kinson, K. Knudson, A.A. Kolozhvari, V. Kondratiev, I. Králik, A. Kravĉáková, P. Kuijer, V. Lenti, R. Lietava, G. Løvhøiden, V. Manzari, G. Martinská, M.A. Mazzoni, F. Meddi, A. Michalon, M. Morando, E. Nappi, F. Navach, P.I. Norman, A. Palmeri, G.S. Pappalardo, B. Pastirĉák, J. Pišút, N. Pišútová, F. Posa, E. Quercigh, F. Riggi, D. Röhrich, G. Romano, K. Šafařík, L. Šándor, E. Schillings, G. Segato, R. Senè, M. Senè, W. Snoeyes, F. Soramel, M. Spyropoulou-Stassinaki, P. Staroba, T.A. Toulina, R. Turrisi, T.S. Tveter, J. Urbán, F.F. Valiev, A. van den Brink, P. van den Ven, P. Vande Vyvre, N. van Eijndhoven, J. van Hunen, A. Vascotto, T. Vik, O. Villalobos-Baillie, L. Vinogradov, T. Virgili, M.F. Votruba, J. Vrláková, and P. Závada

Published
2003

20. Results on 40 A GeV/c PbPb collisions from the NA57 experiment

Author

F.F. Valiev, G Martinská, M. Spyropoulou-Stassinaki, N. Carrer, F. Navach, S. Di Liberto, J. Urban, Ivan Kralik, Haavard Helstrup, A. Jacholkowski, Anju Bhasin, G. A. Feofilov, M. A. Mazzoni, R. Kamermans, M.F. Votruba, T. Vik, P. G. Kuijer, W. Snoeys, Roman Lietava, R. F. Clarke, P.C. de Rijke, V. Lenti, Roberto Barbera, A. Jusko, F. Fayazzadeh, P van de Ven, Andrea Dainese, M. Morando, Francesca Soramel, A.K. Holme, B. Ghidini, Trine Spedstad Tveter, A. Palmeri, M. Henriquez, A. Belogianni, E Quercigh, D. Elia, K. Knudson, Giacomo Bruno, P.I. Norman, G. T. Jones, T.A. Toulina, David H. Evans, Vito Manzari, I. J. Bloodworth, L. Sˇándor, N. Pisˇútova, Federico Antinori, R. Sené, Francesco Riggi, S A Bull, E. Nappi, Paraskevi Ganoti, J. Fedorisˇin, J. Pisˇút, N. van Eijndhoven, G. Grella, M. Sené, M. Campbell, A. Vascotto, K. Sˇafarˇík, A. van den Brink, G.S. Pappalardo, Leonid Vinogradov, O. Villalobos Baillie, V. P. Kondratiev, Pavel Staroba, F. Posa, Dieter Røhrich, Roberto Divia, E. Schillings, A.P. de Haas, B. Pastircˇák, G. Romano, A. Kravcˇáková, A.A. Kolozhavari, Franco Meddi, J.B. Kinson, J. van Hunen, Tiziano Virgili, Janka Vrlakova, P. Jovanovic, K. Fanebust, Petr Zavada, R. A. Fini, A. Michalon, G.F. Segato, Angela Badala, P. Vande Vyrvre, Gunnar Løvhøiden, Wisla Carena, D. Di Bari, R. Turrisi, and Rocco Caliandro

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Nuclear Theory, Hyperon, Hyperons, Strangeness, Nuclear physics, Baryon, High Energy Physics::Experiment, Quark Gluon Plasma, Nuclear Experiment, Beam energy
Abstract

The NA57 experiment has been designed to study the onset of the strange baryon and antibaryon enhancements in Pb Pb with respect to p-Be collisions, first observed by WA97 at 160 A GeV/ c . NA57 has extended the WA97 measurements to investigate the evolution of strangeness enhancement over a wider centrality range and as a function of the beam energy. Results on hyperon production in central Pb Pb collisions at 40 A GeV/ c are presented and compared with those obtained at higher energy, in the same centrality range.

Published
2003

21. Strange Baryon Production from the NA57 Experiment at the CERN SPS

Author

F.F. Valiev, J. Urban, Federico Antinori, I. J. Bloodworth, Anju Bhasin, M. A. Mazzoni, Anton Jusko, Ivan Kralik, B. Ghidini, G. A. Feofilov, K. Fanebust, R. A. Fini, A.P. de Haas, A. Michalon, F. Navach, P. Vande Vyvre, Dieter Røhrich, Giuseppe Bruno, Rocco Caliandro, M. Luptak, M. Campbell, J. Pišút, P.C. de Rijke, G.F. Segato, E. Quercigh, Angela Badala, G. Romano, T. Vik, R. F. Clarke, O. Villalobos Baillie, V. P. Kondratiev, A.K. Holme, F. Fayazzadeh, Franco Meddi, K. Šafařík, G. Martinská, J. Ftacnik, Andrea Dainese, A. Kolojvari, N. Carrer, Rosario Turrisi, Trine Spedstad Tveter, R. Kamermans, M.F. Votruba, S A Bull, T.A. Toulina, D. Muigg, E. Nappi, M. Sené, K. Knudson, V. Lenti, A. Belogianni, Tiziano Virgili, A. Jacholkowski, N. Pisutova, M. Morando, vho, Leonid Vinogradov, M. Spyropoulou-Stassinaki, Petr Zavada, G. Lo, N. van Eijndhoven, F. Posa, P.I. Norman, G. T. Jones, Pavel Staroba, L. Sandor, Haavard Helstrup, P. van den Ven, E. Schillings, Roberto Divia, Wisla Carena, D. Di Bari, A. van den Brink, D. Evans, M. Henriquez, iden, Francesco Riggi, G. S. Pappalardo, P. G. Kuijer, D. Elia, G. Grella, Vito Manzari, F. Soramel, A. Vascotto, W. Snoeys, R. Lietava, R. Sené, J.B. Kinson, J. van Hunen, A. Palmeri, Janka Vrlakova, P. Jovanovic, J. Fedorisin, Adela Kravcakova, S. Di Liberto, B. Pastirčák, and Roberto Barbera

Subjects
Physics, Particle physics, Strange quark, Physics::Instrumentation and Detectors, Nuclear Theory, Hyperon, Omega baryon, Lambda baryon, Xi baryon, Sigma baryon, Baryon, Nuclear physics, Strange matter, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The production of strange baryons and anti‐baryons in PbPb and pBe collisions has been studied by the NA57 experiment at the CERN SPS, extending down the centrality range covered by the previous WA97 experiment, and collecting data at two different energies. The enhanced production of such particles in central PbPb collisions with respect to pBe has been experimentally confirmed. This paper discusses results on Ⅺ and Λ hyperon production obtained at 40 and 158 A GeV/c.

Published
2002

22. Results on hyperon production from Na57

Author

M. Morando, S A Bull, Kondratev, Pavel Staroba, B. Ghidini, Roberto Divia, Domenico Di Bari, Karel Safarik, R. A. Fini, W. Snoeys, Giuseppe Bruno, A. Michalon, Ivan Kralik, P. Vande Vyvre, F.F. Valiev, K. Knudson, Anju Bhasin, F. Navach, G. A. Feofilov, R. Lietava, Petr Zavada, P.C. de Rijke, Trine Spedstad Tveter, M. Sené, Kristin Fanebust Hetland, T. Vik, Federico Antinori, R. Sené, Haavard Helstrup, E. Nappi, P. G. Kuijer, G Martinská, M. Campbell, R. Barbera, Rocco Caliandro, P.I. Norman, R. F. Clarke, G. T. Jones, S. Di Liberto, M. Spyropoulou-Stassinaki, D. Muigg, P. Jovanovic, F. Soramel, B. Pastirčák, Gunnar Løvhøiden, A. Palmeri, Davide Elia, J.B. Kinson, M. Luptak, G.F. Segato, Jozef Urban, M. A. Mazzoni, L. Šándor, E. Quercigh, G.S. Pappalardo, Jan Pisut, O. Villalobos Baillie, A.P. de Haas, A. Vascotto, Lenti, Manzari, F. Posa, J. van Hunen, G. Romano, J. Ftacnik, N Carrer, A.K. Holme, A. Belogianni, Franco Meddi, N. Pišútová, David H. Evans, G. Grella, A. Jacholkowski, A. van den Brink, J. Fedorisin, Adela Kravcakova, A.A. Kolozhvarii, Tiziano Virgili, Francesco Riggi, T.A. Tulina, E. Schillings, A. Jusko, P van de Ven, Wisla Carena, Janka Vrlakova, A. Badalà, I. J. Bloodworth, N. van Eijndhoven, I. Vinogradov, Dieter Røhrich, R. Kamermans, M.F. Votruba, F. Fayazzadeh, Andrea Dainese, M. Henriquez, Rosario Turrisi, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), NA57, and Heyd, Yvette

Subjects
Physics, Nuclear and High Energy Physics, Focus (computing), Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Theory, Hyperon, Hyperons, Baryon, Nuclear physics, Quark Gluon Plasma, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Production (economics), Nuclear Experiment
Abstract

The NA57 experiment has been designed to study the onset of enhanced production of strange baryons and anti-baryons in Pb-Pb collisions with respect to p-Be collisions. Results from 40 and 160 A GeV/c Pb-Pb data will be shown. The main focus is on the checks of the NA57 analysis chain.

Published
2001

23. Centrality dependence of strange baryon yields in Pb-Pb collisions

Author

I. J. Bloodworth, S. Di Liberto, J. Fedorisin, Adela Kravcakova, Petr Zavada, F.F. Valiev, Anju Bhasin, B. Pastirčák, A. Kolojvari, N. Carrer, J. Ftacnik, Giuseppe Bruno, G. A. Feofilov, F. Fayazzadeh, Andrea Dainese, Dieter Røhrich, L. Sandor, Haavard Helstrup, M. Henriquez, K. Fanebust, J. van Hunen, J. Pisutova, E. Nappi, Pavel Staroba, Roberto Divia, Gunnar Løvhøiden, D. Elia, J. Urban, T.A. Toulina, D. Muigg, Vito Manzari, G. Romano, E. Schillings, A. Vascotto, Wisla Carena, G. Martinská, A. Palmeri, D. Di Bari, Janka Vrlakova, N. van Eijndhoven, I. Vinogradov, Karel Safarik, W. Snoeys, M. Luptak, G.F. Segato, G. S. Pappalardo, P. G. Kuijer, D. Evans, P van de Ven, Trine Spedstad Tveter, P. Jovanovic, E. Quercigh, Angela Badala, O. Villalobos Baillie, V. P. Kondratiev, Roberto Barbera, R. Kamermans, M.F. Votruba, Rocco Caliandro, P.I. Norman, G. T. Jones, A. Jacholkowski, M. Campbell, J.B. Kinson, A. van den Brink, S A Bull, Rosario Turrisi, R. A. Fini, A. Michalon, K. Knudson, M. Morando, R. Sené, M. Sené, V. Lenti R. Lietava, P. Vande Vyvre, J. Pišút, F. Posa, Anton Jusko, Ivan Kralik, F. Soramel, Federico Antinori, A.K. Holme, A.P. de Haas, Franco Meddi, Tiziano Virgili, M. A. Mazzoni, B. Ghidini, F. Navach, T. Vik, R. F. Clarke, Francesco Riggi, G. Grella, Heyd, Yvette, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and NA57

Subjects
Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Nuclear Theory, Phase (waves), Function (mathematics), Collision, 01 natural sciences, Baryon, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nucleon, Centrality, Nuclear Experiment
Abstract

PoS(hep2001)248; New data on strange baryon yields in Pb–Pb interactions at 158 GeV/c per nucleon are presented as a function of the collision centrality. The possible onset of a deconfined phase when the collision involves from 50 to 100 wounded nucleons is discussed.

Published
2001

24. Determination of the event centrality in the WA97 and NA57 experiments

Author

Giorgio Torrieri, Rocco Caliandro, Roberto Barbera, Jan Pisut, G.S. Pappalardo, L. Sandor, Haavard Helstrup, T.A. Tulina, O. Villalobos Baillie, J. Urban, V. P. Kondratiev, J. Fedorisin, Michael A. Thompson, A. Kolojvari, N. Carrer, Anton Jusko, Ivan Kralik, F. Navach, E. Nappi, P. G. Kuijer, Rosario Turrisi, S. Di Liberto, A. Vascotto, B. Pastirčák, F. Posa, Wisla Carena, J.B. Kinson, V. Lenti, Janka Vrlakova, A. van den Brink, M. Morando, F.F. Valiev, R. A. Fini, B. Ghidini, E. Schillings, K. Fanebust, A. Michalon, D. Muigg, Eugenio Cantatore, Federico Antinori, David H. Evans, M. A. Mazzoni, G. Grella, Francesco Riggi, Pavel Staroba, G. Romano, R. Lietava, Roberto Divia, Domenico Di Bari, R. Sené, A. Palmeri, G Martinská, Davide Elia, T. Vik, W. Beusch, J. Ftacnik, A. Jacholkowski, W. Snoeys, P. Vande Vyvre, Trine Spedstad Tveter, D. Huss, Petr Zavada, K. Knudson, G. A. Feofilov, Gunnar Løvhøiden, M. Luptak, G.F. Segato, P.I. Norman, G. T. Jones, E. Quercigh, A.P. de Haas, A.K. Holme, N. Pišútová, M. Sené, M.E. Michalon-Mentzer, M. Campbell, Franco Meddi, Marisa Gulino, Tiziano Virgili, K. Šafařík, P van de Ven, Giuseppe Bruno, P. Jovanovic, A. Badalà, I. J. Bloodworth, Dieter Røhrich, R. Kamermans, M.F. Votruba, W. Klempt, F. Fayazzadeh, M. Henriquez, L. Vannucci, Vito Manzari, N. van Eijndhoven, I. Vinogradov, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Strange quark, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, Nuclear Interactions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, Quark Gluon Plasma, Quark–gluon plasma, Nuclear Experiment, Nucleon, Centrality, Event (particle physics)
Abstract

The procedure employed by the WA97 and NA57 experiments to determine the number of wounded nucleons in different Pb + Pb centrality classes is discussed. We will also compare different centrality scales and their influence on the measurement of the centrality dependence of strange particle yields.

Published
2001

25. Results on hyperon production from CERN NA57 experiment

Author

M. Sené, Franco Meddi, M. Henriquez, A. Jacholkowski, D. Elia, Leonid Vinogradov, E. Nappi, V. Lenti, Tiziano Virgili, Vito Manzari, E. Schillings, Pavel Staroba, Roberto Divia, F. Soramel, Anton Jusko, Ivan Kralik, R. Kamermans, Federico Antinori, M.F. Votruba, Giuseppe Bruno, N. van Eijndhoven, P.C. de Rijke, R. Lietava, Wisla Carena, R. Sené, Rocco Caliandro, J. Urban, D. Di Bari, S A Bull, Janka Vrlakova, M. Campbell, A. Vascotto, D. Evans, J. Ftacnik, A.P. de Haas, F.F. Valiev, L. Sandor, J. Fedorisin, Adela Kravcakova, K. Šafařík, Trine Spedstad Tveter, Haavard Helstrup, K. Fanebust, J.B. Kinson, F. Fayazzadeh, W. Snoeys, A.K. Holme, M. A. Mazzoni, P.I. Norman, G. T. Jones, J. van Hunen, B. Ghidini, I. J. Bloodworth, P. Jovanovic, P van de Ven, P. Vande Vyvre, A. Palmeri, J. Pišút, F. Navach, Dieter Røhrich, Petr Zavada, K. Knudson, N. Pisutova, G. Romano, A. van den Brink, N. Carrer, O. Villalobos Baillie, V. P. Kondratiev, G. S. Pappalardo, P. G. Kuijer, Rosario Turrisi, M. Morando, Roberto Barbera, Anatoly Kolozhvari, Anju Bhasin, Francesco Riggi, G. A. Feofilov, G. Grella, F. Posa, S. Di Liberto, T. Vik, B. Pastirčák, R. F. Clarke, T.A. Toulina, D. Muigg, Gunnar Løvhøiden, M. Luptak, G.F. Segato, E. Quercigh, Angela Badala, R. A. Fini, A. Michalon, G. Martinská, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), NA57, and Heyd, Yvette

Subjects
Physics, Particle physics, Large Hadron Collider, Nuclear Theory, Hyperon, Xi baryon, Baryon, Momentum, Nuclear physics, [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Quark–gluon plasma, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Beam (structure)
Abstract

NA57 has been specifically designed to study the onset of strange baryon and antibaryon enhancements in Pb-Pb with respect to p-Be collisions, first observed by the WA97 experiment at 160 A GeV/c beam momentum. The aim is to look for the dependence of these enhancements on the interaction volume, as measured by the number of wounded nucleons, and the energy per incoming nucleon. In NA57 the centrality range goes down to a lower limit of about 50 wounded nucleons, compared with about 100 in WA97. Data have been collected both at 160 and at 40 A GeV/c, while WA97 collected data only at the top SPS beam momentum of 160 A GeV/c. In this contribution we recall the main features of the NA57 experiment and we present the first results on Ⅺ− and Ⅺ+ hyperon production in Pb-Pb collisions at 160 A GeV/c.

Published
2001

26. Probing the specific entropy produced in ultrarelativistic heavy-ion collisions with a silicon pixel multiplicity detector: a simulation study

Author

I. J. Bloodworth, G.S. Pappalardo, E. Nappi, O. Villalobos Baillie, Federico Antinori, K. Šafařík, P van de Ven, R. A. Fini, A. Michalon, Eugenio Cantatore, M. A. Mazzoni, V. Lenti, Domenico Di Bari, G. A. Feofilov, M. Luptak, G.F. Segato, E. Quercigh, A.P. de Haas, Petr Zavada, M. Botje, T.A. Tulina, Dieter Røhrich, A. K. Holme, A. Badalà, Pavel Staroba, Roberto Divia, M.E. Michalon-Mentzer, N. Pišútová, P. Vande Vyvre, A. Kolojvari, N. Carrer, M. Morando, B. Ghidini, O.I. Stolyarov, F.A. Tsimbal, R. Turrisi, Giorgio Torrieri, Franco Meddi, E. Schillings, B. Kocper, G. Tomasicchio, Marisa Gulino, Gunnar Løvhøiden, R. Kamermans, M.F. Votruba, G. Romano, W. Klempt, Jan Pisut, L. Vannucci, Francesco Riggi, Rocco Caliandro, Vito Manzari, G. Grella, P. G. Kuijer, N. van Eijndhoven, I. Vinogradov, M. Campbell, P. Jovanovic, K. Fanebust, J. Urban, J. Fedorisin, David H. Evans, Anton Jusko, Ivan Kralik, L. Sandor, Haavard Helstrup, F. Posa, F.F. Valiev, Wisla Carena, F. Pellegrini, Michael A. Thompson, A. Vascotto, A. van den Brink, G Martinská, Trine Spedstad Tveter, K. Knudson, J. Ftacnik, R. Lietava, P.I. Norman, G. T. Jones, Janka Vrlakova, Roberto Barbera, A. Jacholkowski, W. Snoeys, J.B. Kinson, Davide Elia, A. Palmeri, S. Di Liberto, B. Pastirčák, F. Navach, T. Virgili, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Silicon, Pixel, Physics::Instrumentation and Detectors, Detector, chemistry.chemical_element, Quark Gluon Plasma, Silicon pixel detector, Nuclear physics, Baryon, chemistry, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Quark–gluon plasma, Entropy (information theory), Nuclear Experiment, Nucleon, Instrumentation
Abstract

A simulation study of a silicon pixel multiplicity detector proposed for the NA57 experiment at CERN SPS has been carried out to evaluate its capability to measure both the total multiplicity and the net baryon content created in Pb+Pb collisions at 40 and 160 GeV/ c per nucleon in order to get information on the specific entropy produced in the reaction. A method of charge assignment is proposed and discussed in detail and the results of the simulation are presented. A benchmark of the method using computer-generated events is also performed.

Published
2000

27. Self-similar Properties of the Light Nuclei Interactions

Author

G. Martinská, V. V. Glagolev, Teodor Siemiarczuk, J. Urban, and M. S. Nioradze

Subjects
Light nucleus, Fragmentation (mass spectrometry), Chemical physics, Chemistry, Nuclear Theory, Binding energy, Nuclear Experiment
Abstract

A new way for representating nuclei fragmentation data is suggested The self-similar behaviour of these processes called out by the kinematics is demonstrated. The convenience of working in accelerated nuclei is underlined, particularly for the determination of the binding energy of a wide class of nuclei fragments.

Published
1999

28. Cross sections of the interactions of4He nuclei with protons at 8·6 and 13·6 GeV/c

Author

J. Urban, J. Hlavacova, H. Braun, V. V. Glagolev, A. Michalon, G. D. Pestova, M. Seman, G. Martinská, L. Sandor, A.K. Kacharava, T. Sobczak, A. Dirner, P. Juillot, R.M. Lebedev, J. P. Gerber, M. S. Nioradze, J Stepaniak, J. Patocka, K. U. Khayretdinov, and Z.R. Salukvadze

Subjects
Nuclear physics, Scattering cross-section, Physics, Particle physics, Formalism (philosophy), General Physics and Astronomy, Hydrogen bubble, Nuclear Experiment, Glauber
Abstract

4He-p collisions at two values of4He momenta-8·6 GeV/c and 13·6 GeV/c — have been studied using the one-metre JINR hydrogen bubble chamber. Total, elastic and topological cross sections have been measured. The results are in agreement with other published data. The elastic differential cross section was compared with the predictions of the Glauber model formalism.

Published
1989

29. Two-pronged events inHe4-pcollisions at 8.56 GeV/cHe4incident momentum

Author

H. Johnstad, P. Juillot, R.M. Lebedev, B.S. Aladashvili, M. Seman, V.N. Streltsov, T. Sobczak, I.S. Saitov, L. I. Zuravleva, K. U. Khayretdinov, A. Michalon, V. V. Glagolev, T. Siemiarczuk, G. Martinská, M. S. Nioradze, P. Zielinski, I. Patočka, A. Fridman, J. P. Gerber, H. Braun, A. N. Gorbunov, and J. Stepaniak

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Meson, Helium-3, Hadron, Production (computer science), Elementary particle, Nuclear Experiment, Nucleon, Isotopes of helium
Abstract

We have studied $^{4}\mathrm{He}$-$p$ collisions at a $^{4}\mathrm{He}$ incident momentum of 8.56 GeV/c using the 1 m Dubna bubble chamber. The $p$--- $^{4}\mathrm{He}$ elastic scattering, the coherent $p+^{4}\mathrm{He}\ensuremath{\rightarrow}N+^{4}\mathrm{He}+\ensuremath{\pi}$ production and the breakup reaction $p+^{4}\mathrm{He}\ensuremath{\rightarrow}p+^{3}\mathrm{He}+n$ have been investigated. Cross sections and production features are presented. From the breakup reaction, subsamples of events in which a $^{3}\mathrm{He}$ or a $n$ appear as spectators were selected. These events were used to study the virtual $\mathrm{pn}\ensuremath{\rightarrow}\mathrm{pn}$ and $p+^{3}\mathrm{He}\ensuremath{\rightarrow}p+^{3}\mathrm{He}$ scattering.NUCLEAR REACTIONS $^{4}\mathrm{He}(p, p)$, ($p, p{\ensuremath{\pi}}^{0}$), ($p, n{\ensuremath{\pi}}^{+}$), ($p, \mathrm{pn}$), $E=1.41$ GeV; bubble chamber; measured $\ensuremath{\sigma}$; deduced $n(p, p)$, $^{3}\mathrm{He}(p, p)$.

Published
1978

30. α-particle break-up in the interaction with protons at 8.6 GeV/c 4He momentum

Author

K. U. Khairetdinov, M. Bano, J. Stepaniak, V. V. Glagolev, R.M. Lebedev, J. Patocka, V. V. Gladun, M. Seman, H. Braun, J. Urban, A. Michalon, L. Šándor, M. S. Nioradze, J. Hlavacova, T. Sobczak, P. Juillot, P. J. Gerber, P. Zielinski, D. G. Miranashvili, and G. Martinská

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Break-Up, Scattering, chemistry.chemical_element, Momentum, Nuclear physics, Pion, chemistry, Hydrogen bubble, Atomic physics, Nuclear Experiment, α particles, Helium
Abstract

Helium break-up reactions have been studied in 4He-proton interactions at 8.6 GeV/c 4He momentum in the hydrogen bubble chamber. Total and differential cross sections for different reaction channels without pion production have been measured. The results have been compared with multiple scattering model predictions.

Published
1985

31. Possible dibaryon states produced in4He-proton interactions

Author

G. Martinská, J. Patocka, J. Hlavacova, D. V. Gersamia, J. Urban, L. Šándor, J. Stepaniak, A.N. Gorbunov, M. S. Nioradze, M. Seman, V. V. Glagolev, M. Bano, P. Zielinski, V. V. Gladun, J. P. Gerber, H. Braun, K. U. Khairetdinov, L.I. Zhuravleva, R.M. Lebedev, A. Michalon, T. Sobczak, P. Juillot, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
Physics, Nuclear and High Energy Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Mass distribution, Hydrogen, Nuclear Theory, chemistry.chemical_element, Elementary particle, Nuclear physics, Effective mass (solid-state physics), chemistry, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Accelerator Physics, Nuclear fusion, Hydrogen bubble, Atomic physics, Nuclear Experiment, Helium
Abstract

In the hydrogen bubble chamber study of the4Hep→dppn reaction at incident alpha 8.6 GeV/c momentum the structures in the two-proton effective mass distribution are observed at 2,035±15 MeV and 2,137±15 MeV. Possible nature of the effect is discussed.

Published
1984

32. Further evidence for the anomalous interaction of 3He secondary nuclei with protons

Author

M. Kravčikoá, G. Martinská, T. Rogava, V. V. Glagolev, M. Bano, G. D. Pestova, T. Siemiarczuk, E. Rusnakova, L. Šándor, R.M. Lebedev, M. S. Nioradze, Z. Salukvadze, J. Urban, W. Wiślicki, and A.K. Kacharava

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Mean free path, Hydrogen bubble, Atomic physics, Beam (structure)
Abstract

Evidence is presented for an anomalously shorter mean free path (mfp) of 3 He uniquely identified secondary nuclei originating from 3 He-p interactions at 13.5 GeV/ c incident momenta in a hydrogen bubble chamber. A sample of 7211 primary collisions leading to 1069 secondary 3 He-p interactions has been analysed. The mfp of secondary nuclei was found to be significantly shorter for the first 10 cm. An admixture of 1.6% of anomalons was found with a mfp of 6 cm as compared to 280 cm for the 3 He beam nuclei.

Published
1987

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