21 results on '"central collisions"'
Search Results
2. Backward shower particle production in high energy nucleus–nucleus collisions — an outlook to centrality dependence.
- Author
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Bhattacharyya, Swarnapratim
- Subjects
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NUCLEAR track detectors , *CENTRALITY , *HEAVY ion collisions - Abstract
A detailed study on the centrality dependence of the different aspects multiplicity distribution of the shower particles produced in the backward direction ( 𝜃 Lab ≥ 9 0 ∘) in nuclear emulsion track detector has been carried out for 2 2 Ne-emulsion interactions at 4.1 AGeV/c. Depending on the values of the total charges or sum of the charges of noninteracting projectile fragments, event samples were classified into four centrality classes. From the analysis presented in this paper, qualitative information about the assembly of shower particles in the backward direction has been extracted. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
3. Different aspects of multiplicity distribution of shower particles in central collisions with AgBr target.
- Author
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Bhattacharyya, Swarnapratim, Haiduc, Maria, Neagu, Alina Tania, and Firu, Elena
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MULTIPLICITY of nuclear particles , *SILVER compounds , *COLLISIONS (Physics) , *ANGULAR momentum (Nuclear physics) , *FLUCTUATIONS (Physics) - Abstract
Different aspects like multiplicity moments, moments and multiplicity fluctuations in terms of scaled variance of the shower particles has been carried out for central events of , and interactions at (4.1-4.5) AGeV/c. Comparison of our results with different experimental analysis of central collisions of emulsion data has been performed whenever available. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
4. Freeze-out properties of multifragmentation events
- Author
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Piantelli, S., Borderie, B., Bonnet, E., Le Neindre, N., Raduta, Ad.R., Rivet, M.F., Bougault, R., Chbihi, A., Dayras, R., Frankland, J.D., Galichet, E., Gagnon-Moisan, F., Guinet, D., Lautesse, P., Lehaut, G., Lopez, O., Mercier, D., Moisan, J., Pârlog, M., and Rosato, E.
- Subjects
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CRYOBIOLOGY , *FORCE & energy , *PARTICLES (Nuclear physics) , *SIMULATION methods & models - Abstract
Abstract: Freeze-out properties of multifragmentation events produced in central 129Xe+ natSn collisions at different beam energies (32, 39, 45 and 50 A MeV) were estimated by means of a simulation based on the experimental data collected by the 4π INDRA multidetector. A rapid increase (between 32 and 45 A MeV) of the fraction of particles emitted at freeze-out is deduced. The existence of a limitation of excitation energy for fragments around 3.0–3.5 A MeV is confirmed. A comparison with the results of a microcanonical statistical model is also performed to verify the overall physical coherence of the present approach. [Copyright &y& Elsevier]
- Published
- 2008
- Full Text
- View/download PDF
5. Estimate of average freeze-out volume in multifragmentation events
- Author
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Piantelli, S., Le Neindre, N., Bonnet, E., Borderie, B., Lanzalone, G., Parlog, M., Rivet, M.F., Bougault, R., Chbihi, A., Dayras, R., Durand, D., Frankland, J.D., Galichet, E., Guinet, D., Lautesse, P., Lopez, O., Rosato, E., Tamain, B., Vient, E., and Vigilante, M.
- Subjects
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SPECTRUM analysis , *CRYOBIOLOGY , *PARTICLES , *FRAGMENTATION reactions - Abstract
Abstract: An estimate of the average freeze-out volume for multifragmentation events is presented. Values of volumes are obtained by means of a simulation using the experimental charged product partitions measured by the 4π multidetector INDRA for 129Xe central collisions on natSn at incident energy. The input parameters of the simulation are tuned by means of the comparison between the experimental and simulated velocity (or energy) spectra of particles and fragments. [Copyright &y& Elsevier]
- Published
- 2005
- Full Text
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6. New approach of fragment charge correlations in 129Xe+natSn central collisions.
- Author
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Charvet, J.-L., Dayras, R., Durand, D., Lopez, O., Cussol, D., Doré, D., Nalpas, L., Van Lauwe, A., and Volant, C.
- Subjects
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COLLISIONS (Nuclear physics) , *NUCLEAR reactions , *CHARGE transfer - Abstract
A previous analysis of the charge (Z) correlations in the ΔZ−〈Z〉plane for 129Xe+natSn central collisions at 32 MeV/n has shown an enhancement in the production of equally sized fragments (low ΔZ) which was interpreted as an evidence for spinodal decomposition. However, the signal is weak and rises the question of the estimation of the uncorrelated yield. After a critical analysis of its robustness, we propose in this paper a new technique to build the uncorrelated yield in the charge correlation function. The application of this method to 129Xe+natSn central collision data at 32, 39, 45 and 50 MeV/n does not show any particular enhancement of the correlation function in any ΔZ bin. [Copyright &y& Elsevier]
- Published
- 2004
- Full Text
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7. Selected aspects of central heavy-ion collisions around Fermi energies studied over 25 years with INDRA
- Author
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Frankland, J.D., Frankland, John, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Caen Normandie, Abdelouahad Chbihi(chbihi@ganil.fr), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
liquid-gas phase transition ,isotropie des événements ,transition de phase liquide-gaz ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,nuclear matter ,event isotropy ,multifragmentation ,matière nucléaire ,collisions centrales ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,central collisions - Published
- 2020
8. Examining the model dependence of the determination of kinetic freeze-out temperature and transverse flow velocity in small collision system
- Author
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Lao, Hai-Ling, Liu, Fu-Hu, Li, Bao-Chun, Duan, Mai-Ying, and Lacey, Roy A.
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- 2018
- Full Text
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9. Kinetic freeze-out temperatures in central and peripheral collisions: which one is larger?
- Author
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Lao, Hai-Ling, Liu, Fu-Hu, Li, Bao-Chun, and Duan, Mai-Ying
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- 2018
- Full Text
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10. Fragment Composition in Central Heavy-Ion Collisions
- Author
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İmal Avcı, Hamide, Büyükçizmeci, Nihal, Oğul, Rıza, and ALKÜ
- Subjects
central collisions,fragment yield,multifragmentation,symmetry energy ,multifragmentation ,symmetry energy ,Nuclear Experiment ,fragment yield ,central collisions - Abstract
Charge, massand isotopic distributions of fragments formed in the central collisions ofneutron poor and neutron rich elements 112Sn + 112Sn and 124Sn+ 124Sn have been theoretically calculated and compared to theexperimental data. Influence of surface and symmetry terms on charge andisotopic distributions, at low density freeze-out were investigated. We show that significant reduction of thesymmetry term coefficient leads to better reproduction of the isotopicdistributions, while the surface term effect is negligible. This is inagreement with our previous findings obtained from the interpretation of bothcentral and peripheral heavy ion collisions.
- Published
- 2018
11. Study of the transport and equilibration properties of the nuclear matter in the Fermi energy domain
- Author
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Henri, Maxime, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université, Olivier Lopez, and STAR, ABES
- Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,Central collisions ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Fermi energy ,Collisions d’ions lourds ,Collisions centrales ,Énergie de Fermi ,Transport de l’isospin ,Multi-détecteur ,Isospin transport ,Heavy ion collisions ,Stopping power ,Nuclear matter ,Multi-detector - Abstract
The nuclear matter equation of the state is an essential tool in the description of heavy ion collisions,but also in the description of the formation of astrophysical objects or phenomena (neutron star structure,neutron stars fusion). Establishing the nuclear matter equation of state requires a proper definition of thethermodynamic conditions (density, temperature, proton/neutron asymmetry) in which the system evolves.In this work, we address the issue of equilibration reached in heavy ion collisions, in terms of energy andisospin. To do this, we use the experimental database of the INDRA array built by the collaboration over thepast 25 years, focusing on central collisions in the Fermi energy domain, between 10 and 100 MeV/nucleon.In this document, we present how, with the help of dedicated simulations, it has been possible to link thestopping power of nuclear matter to the in-medium nucleon-nucleon cross-section. We also provide someanswers regarding isospin transport in central collisions using the isobaric ratios A = 3 based on the tritonsand helium-3 particles. These different results allow us to highlight the new experimental apparatus devel-loped by the INDRA and FAZIA collaborations : the FAZIA array. The latter is the result of a ten-yearperiod of research and development, resulting in an array embedded its digital electronic under vacuum, withincreased identification performance (measurement of the Z charge and A mass up to Z = 25) compared tothe previous generations arrays., L’équation d’état de la matière nucléaire est un outil primordial dans la description des collisions entreions lourds, mais également dans la description de la formation d’objets ou de phénomènes astrophysiques(structure des étoiles à neutrons, fusion d’étoiles à neutron). Établir l’équation d’état de la matière nucléairerequiert de définir de manière précise les conditions thermodynamiques (densité, température, asymétrie pro-ton/neutron) dans lesquelles le systèmes évolue. Dans ce travail, nous abordons la problématique de l’étatd’équilibration maximal qui est atteint dans les collisions entre ions lourds, en terme d’énergie et d’isospin.Pour cela, nous utilisons la base de données expérimentale du multi-détecteur INDRA construite par lacollaboration au cours de ces 25 dernières années, en nous intéressant plus particulièrement aux collisionscentrales dans le domaine de l’énergie de Fermi, entre 10 et 100 MeV/nucléon. Nous présentons ainsi dansce document, comment à l’aide de simulation dédiées, il nous a été possible de relier le pouvoir d’arrêt de lamatière nucléaire à la section efficace de collision nucléon-nucléon dans la matière nucléaire. Nous apportonségalement des éléments de réponse au regard du transport de l’isospin dans les collisions centrales à l’aidedes rapports isobariques A = 3 construits à partir des tritons et des hélium-3. Ces différents résultats nouspermettent de mettre en avant le nouveau dispositif expérimental mis en place par les collaborations INDRAet FAZIA : le multi-détecteur FAZIA. Ce dernier est le résultat d’une période de recherche et développementde dix ans, ayant abouti à un multi-détecteur embarquant son électronique numérique sous vide, avec desperformances d’identification accrues (mesure de la charge Z et de la masse A jusqu’à Z = 25) par rapportaux multi-détecteurs des générations précédentes.
- Published
- 2018
12. Etude des propriétés de transport et d'équilibration de la matière nucléaire dans le domaine de l'énergie de Fermi
- Author
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Henri, Maxime, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université, and Olivier Lopez
- Subjects
Fermi energy ,Collisions d’ions lourds ,Collisions centrales ,Énergie de Fermi ,Transport de l’isospin ,Multi-détecteur ,Isospin transport ,Heavy ion collisions ,Central collisions ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Stopping power ,Nuclear matter ,Multi-detector - Abstract
The nuclear matter equation of the state is an essential tool in the description of heavy ion collisions,but also in the description of the formation of astrophysical objects or phenomena (neutron star structure,neutron stars fusion). Establishing the nuclear matter equation of state requires a proper definition of thethermodynamic conditions (density, temperature, proton/neutron asymmetry) in which the system evolves.In this work, we address the issue of equilibration reached in heavy ion collisions, in terms of energy andisospin. To do this, we use the experimental database of the INDRA array built by the collaboration over thepast 25 years, focusing on central collisions in the Fermi energy domain, between 10 and 100 MeV/nucleon.In this document, we present how, with the help of dedicated simulations, it has been possible to link thestopping power of nuclear matter to the in-medium nucleon-nucleon cross-section. We also provide someanswers regarding isospin transport in central collisions using the isobaric ratios A = 3 based on the tritonsand helium-3 particles. These different results allow us to highlight the new experimental apparatus devel-loped by the INDRA and FAZIA collaborations : the FAZIA array. The latter is the result of a ten-yearperiod of research and development, resulting in an array embedded its digital electronic under vacuum, withincreased identification performance (measurement of the Z charge and A mass up to Z = 25) compared tothe previous generations arrays.; L’équation d’état de la matière nucléaire est un outil primordial dans la description des collisions entreions lourds, mais également dans la description de la formation d’objets ou de phénomènes astrophysiques(structure des étoiles à neutrons, fusion d’étoiles à neutron). Établir l’équation d’état de la matière nucléairerequiert de définir de manière précise les conditions thermodynamiques (densité, température, asymétrie pro-ton/neutron) dans lesquelles le systèmes évolue. Dans ce travail, nous abordons la problématique de l’étatd’équilibration maximal qui est atteint dans les collisions entre ions lourds, en terme d’énergie et d’isospin.Pour cela, nous utilisons la base de données expérimentale du multi-détecteur INDRA construite par lacollaboration au cours de ces 25 dernières années, en nous intéressant plus particulièrement aux collisionscentrales dans le domaine de l’énergie de Fermi, entre 10 et 100 MeV/nucléon. Nous présentons ainsi dansce document, comment à l’aide de simulation dédiées, il nous a été possible de relier le pouvoir d’arrêt de lamatière nucléaire à la section efficace de collision nucléon-nucléon dans la matière nucléaire. Nous apportonségalement des éléments de réponse au regard du transport de l’isospin dans les collisions centrales à l’aidedes rapports isobariques A = 3 construits à partir des tritons et des hélium-3. Ces différents résultats nouspermettent de mettre en avant le nouveau dispositif expérimental mis en place par les collaborations INDRAet FAZIA : le multi-détecteur FAZIA. Ce dernier est le résultat d’une période de recherche et développementde dix ans, ayant abouti à un multi-détecteur embarquant son électronique numérique sous vide, avec desperformances d’identification accrues (mesure de la charge Z et de la masse A jusqu’à Z = 25) par rapportaux multi-détecteurs des générations précédentes.
- Published
- 2018
13. Measurement of jet suppression in central Pb–Pb collisions at √sNN = 2.76 TeV
- Author
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Adam, J., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmed, I., Ahn, S. U., Aimo, I., Aiola, S., Ajaz, M., Akindinov, A., Alam, S. N., Aleksandrov, D., Alessandro, B., Alexandre, D., Alfaro Molina, R., Alici, A., Alkin, A., Alme, J., Alt, T., Altinpinar, S., Altsybeev, I., Alves Garcia Prado, C., Andrei, C., Andronic, A., Anguelov, V., Anielski, J., Antičić, T., Antinori, F., Antonioli, P., Aphecetche, L., Appelshäuser, H., Arcelli, S., Armesto, N., Arnaldi, R., Aronsson, T., Arsene, I. C., Arslandok, M., Augustinus, A., Averbeck, R., Azmi, M. D., Bach, M., Badalà, A., Baek, Y. W., Bagnasco, S., Bailhache, R., Bala, R., Baldisseri, A., Ball, M., Baltasar Dos Santos Pedrosa, F., Baral, R. C., Barbano, A. M., Barbera, R., Barile, F., Barnaföldi, G. G., Barnby, L. S., Barret, V., Bartalini, P., Bartke, J., Bartsch, E., Basile, M., Bastid, N., Basu, S., Bathen, B., Batigne, G., Batista Camejo, A., Batyunya, B., Batzing, P. C., Bearden, I. G., Beck, H., Bedda, C., Behera, N. K., Belikov, I., Bellini, F., Bello Martinez, H., Bellwied, R., Belmont, R., Belmont Moreno, E., Belyaev, V., Bencedi, G., Beole, S., Berceanu, I., Bercuci, A., Berdnikov, Y., Berenyi, D., Bertens, R. A., Berzano, D., Betev, L., Bhasin, A., Bhat, I. R., Bhati, A. K., Bhattacharjee, B., Bhom, J., Bianchi, L., Bianchi, N., Bianchin, C., Bielčík, J., Bielčíková, J., Bilandzic, A., Biswas, S., Bjelogrlic, S., Blanco, F., Blau, D., Blume, C., Bock, F., Bogdanov, A., Bøggild, H., Boldizsár, L., Bombara, M., Book, J., Borel, H., Borissov, A., Borri, M., Bossú, F., Botje, M., Botta, E., Böttger, S., Braun Munzinger, P., Bregant, M., Breitner, T., Broker, T. A., Browning, T. A., Broz, M., Brucken, E. J., Bruna, E., Bruno, G. E., Budnikov, D., Buesching, H., Bufalino, S., Buncic, P., Busch, O., Buthelezi, Z., Buxton, J. T., Caffarri, D., Cai, X., Caines, H., Calero Diaz, L., Caliva, A., Calvo Villar, E., Camerini, Paolo, Carena, F., Carena, W., Castillo Castellanos, J., Castro, A. J., Casula, E. A. R., Cavicchioli, C., Ceballos Sanchez, C., Cepila, J., Cerello, P., Chang, B., Chapeland, S., Chartier, M., Charvet, J. L., Chattopadhyay, S., Chelnokov, V., Cherney, M., Cheshkov, C., Cheynis, B., Chibante Barroso, V., Chinellato, D. D., Chochula, P., Choi, K., Chojnacki, M., Choudhury, S., Christakoglou, P., Christensen, C. H., Christiansen, P., Chujo, T., Chung, S. U., Cicalo, C., Cifarelli, L., Cindolo, F., Cleymans, J., Colamaria, F., Colella, D., Collu, A., Colocci, M., Conesa Balbastre, G., Conesa del Valle, Z., Connors, M. E., Contreras, J. G., Cormier, T. M., Corrales Morales, Y., Cortés Maldonado, I., Cortese, P., Cosentino, M. R., Costa, F., Crochet, P., Cruz Albino, R., Cuautle, E., Cunqueiro, L., Dahms, T., Dainese, A., Danu, A., Das, D., Das, I., Das, S., Dash, A., Dash, S., De, S., De Caro, A., de Cataldo, G., de Cuveland, J., De Falco, A., De Gruttola, D., De Marco, N., De Pasquale, S., Deisting, A., Deloff, A., Dénes, E., D'Erasmo, G., Di Bari, D., Di Mauro, A., Di Nezza, P., Diaz Corchero, M. A., Dietel, T., Dillenseger, P., Divià, R., Djuvsland, Ø., Dobrin, A., Dobrowolski, T., I, Domenicis Gimenez, D., Dönigus, B., Dordic, O., Dubey, A. K., Dubla, A., Ducroux, L., Dupieux, P., Ehlers, R. J., Elia, D., Engel, H., Erazmus, B., Erhardt, F., Eschweiler, D., Espagnon, B., Estienne, M., Esumi, S., Eum, J., Evans, D., Evdokimov, S., Eyyubova, G., Fabbietti, L., Fabris, D., Faivre, J., Fantoni, A., Fasel, M., Feldkamp, L., Felea, D., Feliciello, A., Feofilov, G., Ferencei, J., Fernández Téllez, A., Ferreiro, E. G., Ferretti, A., Festanti, A., Figiel, J., Figueredo, M. A. S., Filchagin, S., Finogeev, D., Fionda, F. M., Fiore, E. M., Floris, M., Foertsch, S., Foka, P., Fokin, S., Fragiacomo, Enrico, Francescon, A., Frankenfeld, U., Fuchs, U., Furget, C., Furs, A., Fusco Girard, M., Gaardhøje, J. J., Gagliardi, M., Gago, A. M., Gallio, M., Gangadharan, D. R., Ganoti, P., Gao, C., Garabatos, C., Garcia Solis, E., Gargiulo, C., Gasik, P., Germain, M., Gheata, A., Gheata, M., Ghosh, P., Ghosh, S. K., Gianotti, P., Giubellino, P., Giubilato, P., Gladysz Dziadus, E., Glässel, P., Gomez Ramirez, A., González Zamora, P., Gorbunov, S., Görlich, L., Gotovac, S., Grabski, V., Graczykowski, L. K., Grelli, A., Grigoras, A., Grigoras, C., Grigoriev, V., Grigoryan, A., Grigoryan, S., Grinyov, B., Grion, N., Grosse Oetringhaus, J. F., Grossiord, J. Y., Grosso, R., Guber, F., Guernane, R., Guerzoni, B., Gulbrandsen, K., Gulkanyan, H., Gunji, T., Gupta, A., Gupta, R., Haake, R., Haaland, Ø., Hadjidakis, C., Haiduc, M., Hamagaki, H., Hamar, G., Hanratty, L. D., Hansen, A., Harris, J. W., Hartmann, H., Harton, A., Hatzifotiadou, D., Hayashi, S., Heckel, S. T., Heide, M., Helstrup, H., Herghelegiu, A., Herrera Corral, G., Hess, B. A., Hetland, K. F., Hilden, T. E., Hillemanns, H., Hippolyte, B., Hristov, P., Huang, M., Humanic, T. J., Hussain, N., Hussain, T., Hutter, D., Hwang, D. S., Ilkaev, R., Ilkiv, I., Inaba, M., Ionita, C., Ippolitov, M., Irfan, M., Ivanov, M., Ivanov, V., Izucheev, V., Jacobs, P. M., Jahnke, C., Jang, H. J., Janik, M. A., Jayarathna, P. H. S. Y., Jena, C., Jena, S., Jimenez Bustamante, R. T., Jones, P. G., Jung, H., Jusko, A., Kadyshevskiy, V., Kalinak, P., Kalweit, A., Kamin, J., Kang, J. H., Kaplin, V., Kar, S., Karasu Uysal, A., Karavichev, O., Karavicheva, T., Karpechev, E., Kebschull, U., Keidel, R., Keijdener, D. L. D., Keil, M., Khan, K. H., Khan, M. M., Khan, P., Khan, S. A., Khanzadeev, A., Kharlov, Y., Kileng, B., Kim, B., Kim, D. W., Kim, D. J., Kim, H., Kim, J. S., Kim, M., Kim, S., Kim, T., Kirsch, S., Kisel, I., Kiselev, S., Kisiel, A., Kiss, G., Klay, J. L., Klein, C., Klein, J., Klein Bösing, C., Kluge, A., Knichel, M. L., Knospe, A. G., Kobayashi, T., Kobdaj, C., Kofarago, M., Köhler, M. K., Kollegger, T., Kolojvari, A., Kondratiev, V., Kondratyeva, N., Kondratyuk, E., Konevskikh, A., Kouzinopoulos, C., Kovalenko, O., Kovalenko, V., Kowalski, M., Kox, S., Koyithatta Meethaleveedu, G., Kral, J., Králik, I., Kravčáková, A., Krelina, M., Kretz, M., Krivda, M., Krizek, F., Kryshen, E., Krzewicki, M., Kubera, A. M., Kučera, V., Kucheriaev, Y., Kugathasan, T., Kuhn, C., Kuijer, P. G., Kulakov, I., Kumar, J., Kumar, L., Kurashvili, P., Kurepin, A., Kurepin, A. B., Kuryakin, A., Kushpil, S., Kweon, M. J., Kwon, Y., La Pointe, S. L., La Rocca, P., Lagana Fernandes, C., Lakomov, I., Langoy, R., Lara, C., Lardeux, A., Lattuca, A., Laudi, E., Lea, Ramona, Leardini, L., Lee, G. R., Lee, S., Legrand, I., Lehnert, J., Lemmon, R. C., Lenti, V., Leogrande, E., León Monzón, I., Leoncino, M., Lévai, P., Li, S., Li, X., Lien, J., Lietava, R., Lindal, S., Lindenstruth, V., Lippmann, C., Lisa, M. A., Ljunggren, H. M., Lodato, D. F., Loenne, P. I., Loggins, V. R., Loginov, V., Loizides, C., Lopez, X., López Torres, E., Lowe, A., X. G., Lu, Luettig, P., Lunardon, M., Luparello, Grazia, Maevskaya, A., Mager, M., Mahajan, S., Mahmood, S. M., Maire, A., Majka, R. D., Malaev, M., Maldonado Cervantes, I., Malinina, L., Mal'Kevich, D., Malzacher, P., Mamonov, A., Manceau, L., Manko, V., Manso, F., Manzari, V., Marchisone, M., Mareš, J., Margagliotti, Giacomo, Margotti, A., Margutti, J., Marín, A., Markert, C., Marquard, M., Martin, N. A., Martin Blanco, J., Martinengo, P., Martínez, M. I., Martínez García, G., Martinez Pedreira, M., Martynov, Y., Mas, A., Masciocchi, S., Masera, M., Masoni, A., Massacrier, L., Mastroserio, A., Masui, H., Matyja, A., Mayer, C., Mazer, J., Mazzoni, M. 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- Subjects
ALICE ,LHC ,2.76 TeV ,jet ,central collisions ,ALICE, LHC, 2.76 TeV, jet, central collisions - Abstract
The transverse momentum (pT) spectrum and nuclear modification factor (RAA) of reconstructed jets in 0–10% and 10–30% central Pb–Pb collisions at √sNN = 2.76 TeV were measured. Jets were reconstructed using the anti-kT jet algorithm with a resolution parameter of R = 0.2 from charged and neutral particles, utilizing the ALICE tracking detectors and Electromagnetic Calorimeter (EMCal). The jet pT spectra are reported in the pseudorapidity interval of |ηjet| < 0.5 for 40 < pT, jet < 120 GeV/c in 0–10% and for 30 < pT, jet < 100 GeV/c in 10–30% collisions. Reconstructed jets were required to contain a leading charged particle with pT > 5 GeV/c to suppress jets constructed from the combinatorial background in Pb–Pb collisions. The leading charged particle requirement applied to jet spectra both in pp and Pb– Pb collisions had a negligible effect on the RAA. The nuclear modification factor RAA was found to be 0.28 ± 0.04 in 0–10% and 0.35 ± 0.04 in 10–30% collisions, independent of pT, jet within the uncertainties of the measurement. The observed suppression is in fair agreement with expectations from two model calculations with different approaches to jet quenching.
- Published
- 2015
14. Suppression of charged particle production at large transverse momentum in central Pb–Pb collisions at √sNN = 2.76 TeV
- Author
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K. Aamodt a, A. Abrahantes Quintana b, D. Adamovác, A. M. Adared, M. M. Aggarwal e, G. Aglieri Rinella f, A. G. Agocs g, S. Aguilar Salazar h, Z. Ahammed i, N. Ahmadj, A. Ahmad Masoodi j, S. U. Ahnk, 1, A. Akindinov l, D. Aleksandrovm, B. Alessandro n, R. Alfaro Molina h, A. Alici o, 2, A. Alkinp, E. Almaráz Aviña h, T. Altq, V. Altini r, S. Altinpinar s, I. Altsybeevt, C. Andrei u, A. Andronic s, V. Anguelov v, 3, 1, C. Anson w, T. Antiˇci ´c x, F. Antinori y, P. Antonioli z, L. Aphecetcheaa, H. Appelshäuser ab, N. Arborac, S. Arcelli o, A. Arendab, N. Armestoad, R. Arnaldi n, T. Aronsson d, I. C. Arsene s, A. Asryant, A. Augustinus f, R. Averbecks, T. C. Awesae, J. Äystöaf, M. D. Azmi j, M. Bachq, A. Badalà ag, Y. W. Baekk, S. Bagnascon, R. Bailhache ab, R. Balaah, 5, R. Baldini Ferroli ai, A. Baldisseri aj, A. Baldit ak, J. Bánal, R. Barberaam, F. Barile r, G. G. Barnaföldi g, L. S. Barnby an, V. Barretak, J. Bartkeao, M. Basile o, N. Bastidak, B. Bathenap, G. Batigne aa, B. 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Mendez Lorenzo f, J. Mercado Pérezbk, P. Mereu n, Y. Miake bt, J. Midori dd, L. Milano ah, J. Milosevic bg, A. Mischke br, D. Mi´skowiec s, C. Mitu ca, J. Mlynarz at, B. Mohantyi, L. Molnarf, L. Montaño Zetinabv, M. Montenon, E. Montesaz, M. Morando y, D. A. Moreira De Godoy cc, S. Morettoy, A. Morsch f, V. Muccifora aw, E. Mudniccp, H. Müller f, S. Muhuri i, M. G. Munhoz cc, J. Munozbw, L. Musaf, A. Musso n, B. K. Nandi cu, R. Naniaz, E. Nappi ce, C. Nattrass db, F. Navachr, S. Navin an, T. K. Nayaki, S. Nazarenko bj, G. Nazarov bj, A. Nedosekin l, F. Nendazbp, J. Newbyde, M. Nicassio r, B. S. Nielsenar, S. Nikolaev m, V. Nikolic x, S. Nikulin m, V. Nikulin au, B. S. Nilsen bo, M. S. Nilsson bg, F. Noferini z, G. Nooren br, N. Novitzky af, A. Nyaninm, A. Nyathacu, C. Nygaard ar, J. Nystranda, H. Obayashi dd, A. Ochirovt, H. Oeschlercv, S. K. Oh k, J. Oleniaczcn, C. Oppedisano n, A. Ortiz Velasquez by, G. Ortonaah, A. Oskarsson bs, P. Ostrowski cn, I. Otterlundbs, J. Otwinowski s, G. Øvrebekk a, K. Oyamabk, K. Ozawacr, Y. Pachmayerbk, M. Pachr ax, F. Padilla ah, P. Pagano cd, G. Pai´c by, F. Painkeq, C. Pajaresad, S. Pal aj, S. K. Pal i, A. Palaha an, A. Palmeri ag, G. S. Pappalardo ag, W. J. Parks, V. Paticchio ce, A. Pavlinovat, T. Pawlakcn, T. Peitzmannbr, D. Peresunkom, C. E. Pérez Lara ay, D. Perini f, D. Perrino r, W. Perytcn, A. Pesci z, V. Peskovf, Y. Pestovdf, A. J. Peters f, V. Petráˇcek ax, M. Petrisu, P. Petrovan, M. Petrovici u, C. Pettaam, A. Piccotti n, M. Pikna bi, P. Pillot aa, O. Pinazza f, L. Pinsky ba, N. Pitz ab, F. Piuz f, D. B. Piyarathna at, R. Plattan, M. Płoskon´ ct, J. Pluta cn, T. Pocheptsov aq, S. Pochybova g, P. L. M. Podesta Lerma co, M. G. Poghosyan ah, K. Polák da, B. Polichtchouk bc, A. Popu, V. Pospíšil ax, B. Potukuchi av, S. K. Prasadat, R. Preghenella ai, F. Prino n, C. A. Pruneau at, I. Pshenichnov ck, G. Puddu cf, A. Pulvirenti am, V. Puninbj, M. Putišbd, J. Putschke d, E. Quercigh f, H. Qvigstad bg, A. Rachevski cl, A. Rademakers f, O. Rademakers f, S. Radomski bk, T. S. Räihäaf, J. Rakaf, A. Rakotozafindrabe aj, L. Ramello bx, A. Ramírez Reyesbv, M. Rammler ap, R. Raniwala dg, S. Raniwala dg, S. S. Räsänen af, K. F. Readdb, J. S. Real ac, K. Redlichcg, R. Renfordt ab, A. R. Reolonaw, A. Reshetinck, F. Rettig q, J. P. Revol f, K. Reygersbk, H. Ricaud cv, L. Riccati n, R. A. Ricci bz, M. Richtera, P. Riedlerf, W. Rieglerf, F. Riggi am, A. Rivetti n, M. Rodríguez Cahuantzi bw, D. Rohr q, D. Röhrich a, R. Romita s, F. Ronchetti aw, P. Rosinský f, P. Rosnet ak, S. Rossegger f, A. Rossi y, F. Roukoutakis cm, S. Rousseau bf, C. Royaa, P. Roybe, A. J. Rubio Montero az, I. Rusanovf, E. Ryabinkin m, A. Rybicki ao, S. Sadovskybc, K. Šafaˇrík f, R. Sahooy, P. K. Sahucb, P. Saizf, S. Sakai ct, D. Sakata bt, C. A. Salgadoad, T. Samanta i, S. Sambyal av, V. Samsonov au, L. Šándoral, A. Sandoval h, M. Sano bt, S. Sanocr, R. Santoap, R. Santoroce, J. Sarkamoaf, P. Saturnini ak, E. Scapparone z, F. Scarlassara y, R. P. Scharenbergdh, C. Schiauau, R. Schicker bk, C. Schmidts, H. R. Schmidt s, S. Schreinerf, S. Schuchmann ab, J. Schukraftf, Y. Schutzaa, K. Schwarzs, K. Schwedabk, G. Scioli o, E. Scomparinn, P. A. Scott an, R. Scottdb, G. Segato y, S. Senyukov bx, J. Seo k, S. Serci cf, E. Serradilla az, A. Sevcencoca, G. Shabratova aq, R. Shahoyan f, N. Sharma e, S. Sharma av, K. Shigaki dd, M. Shimomura bt, K. Shtejer b, Y. Sibiriakm, M. Siciliano ah, E. Sickingf, T. Siemiarczukcg, A. Silenzi o, D. Silvermyr ae, G. Simonetti f, R. Singaraju i, R. Singh av, B. C. Sinha i, T. Sinha be, B. Sitarbi, M. Sittabx, T. B. Skaali bg, K. Skjerdal a, R. Smakal ax, N. Smirnov d, R. Snellings ay, C. Søgaard ar, A. Soloviev bc, R. Soltzde, H. Soncs, M. Songcw, C. Soos f, F. Soramel y, M. Spyropoulou Stassinaki cm, B. K. Srivastavadh, J. Stachel bk, I. Stanca, G. Stefanek cg, G. Stefanini f, T. Steinbeckv, E. Stenlundbs, G. Steynbl, D. Stocco aa, R. Stockab, M. Stolpovskiy bc, P. Strmenbi, A. A. P. Suaide cc, M. A. Subieta Vásquez ah, T. Sugitate dd, C. Suire bf, M. Šumbera c, T. Susa x, D. Swobodaf, T. J. M. Symons ct, A. Szanto de Toledocc, I. Szarkabi, A. Szostaka, C. Tagridis cm, J. Takahashi bq, J. D. Tapia Takaki bf, A. Taurof, M. Tavletf, G. Tejeda Muñoz bw, A. Telesca f, C. Terrevoli r, J. Thäders, D. Thomasbr, J. H. Thomas s, R. Tieulent bp, A. R. Timmins at, D. Tlusty ax, A. Toia f, H. Torii dd, L. Toscano f, F. Tosello n, T. Traczykcn, D. Truesdale w, W. H. Trzaskaaf, A. Tumkinbj, R. Turrisi cj, A. J. Turveybo, T. S. Tveterbg, J. Uleryab, K. Ullaland a, A. Urascf, J. Urbánbd, G. M. Urciuoli ch, G. L. Usai cf, M. Valaaq, L. Valencia Palomo bf, S. Vallero bk, N. van der Kolkay, M. van Leeuwen br, P. Vande Vyvre f, L. Vannucci bz, A. Vargasbw, R. Varmacu, M. Vasileioucm, A. Vasilievm, V. Vechernin t, E. Vercellin ah, S. Vergara bw, R. Vernet di, M. Verweij br, L. Vickovic cp, G. Viesti y, O. Vikhlyantsev bj, Z. Vilakazi bl, O. Villalobos Baillie an, A. Vinogradovm, L. Vinogradov t, Y. Vinogradov bj, T. Virgili cd, Y. P. Viyogi i, A. Vodopyanov aq, K. Voloshin l, S. Voloshin at, G. Volpe r, B. von Haller f, D. Vranics, J. Vrlákovábd, B. Vulpescu ak, B. Wagnera, V. Wagnerax, R. Wan as, D. Wangbm, Y. Wangbk, Y. Wangbm, K. Watanabe bt, J. P. Wessels ap, U. Westerhoffap, J. Wiechula bk, J. Wiknebg, M. Wildeap, A. Wilk ap, G. Wilk cg, M. C. S. Williams z, B. Windelband bk, H. Yang aj, S. Yasnopolskiym, J. Yi dj, Z. Yinbm, H. Yokoyamabt, I. K. Yoo dj, X. Yuanbm, I. Yushmanovm, E. Zabrodin bg, C. Zampolli f, S. Zaporozhets aq, A. Zarochentsev t, P. Závadada, H. Zbroszczyk cn, P. Zelnicek v, A. Zeninbc, I. Zguraca, M. Zhalovau, X. Zhang bm, D. Zhoubm, A. Zichichi o, G. Zinovjev p, Y. Zoccarato bp, M. Zynovyev p., LEA, RAMONA, BREGANT, MARCO, CAMERINI, Paolo, CONTIN, GIACOMO, FRAGIACOMO, ENRICO, GROSSO, Raffaele, MARGAGLIOTTI, GIACOMO, PIANO, STEFANO, RUI, RINALDO, VACCHI, Andrea, VENARUZZO, MASSIMO, K., Aamodt a, A., Abrahantes Quintana b, D., Adamovác, A. M., Adared, M. M., Aggarwal e, G., Aglieri Rinella f, A. G., Agocs g, S., Aguilar Salazar h, Z., Ahammed i, N., Ahmadj, A., Ahmad Masoodi j, S. U., Ahnk, A., Akindinov l, D., Aleksandrovm, B., Alessandro n, R., Alfaro Molina h, A., Alici o, A., Alkinp, E., Almaráz Aviña h, T., Altq, V., Altini r, S., Altinpinar, I., Altsybeevt, C., Andrei u, A., Andronic, V., Anguelov v, 3, 1, C., Anson w, T., Antiˇci ´c x, F., Antinori y, P., Antonioli z, L., Aphecetcheaa, H., Appelshäuser ab, ∗, N., Arborac, S., Arcelli o, A., Arendab, N., Armestoad, R., Arnaldi n, T., Aronsson d, I. C., Arsene, A., Asryant, A., Augustinus f, R., Averbeck, T. C., Awesae, J., Äystöaf, M. D., Azmi j, M., Bachq, A., Badalà ag, Y. W., Baekk, S., Bagnascon, R., Bailhache ab, R., Balaah, R., Baldini Ferroli ai, A., Baldisseri aj, A., Baldit ak, J., Bánal, R., Barberaam, F., Barile r, G. G., Barnaföldi g, L. S., Barnby an, V., Barretak, J., Bartkeao, M., Basile o, N., Bastidak, B., Bathenap, G., Batigne aa, B., Batyunyaaq, C., Baumannab, I. G., Bearden ar, H., Beck ab, I., Belikova, F., Bellini o, R., Bellwied at, E., Belmont Moreno h, Lea, Ramona, I., Berceanuu, A., Bercuci u, E., Berdermann, Y., Berdnikovau, L., Betevf, A., Bhasinav, A. K., Bhati e, L., Bianchi ah, N., Bianchi aw, C., Bianchin y, J., Bielˇcík ax, J., Bielˇcíková c, A., Bilandzic ay, E., Biolcati ah, A., Blancak, F., Blanco az, F., Blancoba, D., Blaum, C., Blumeab, M., Boccioli f, N., Bockw, A., Bogdanovbb, H., Bøggild ar, M., Bogolyubsky bc, L., Boldizsárg, M., Bombarabd, C., Bombonati y, J., Book ab, H., Borel aj, C., Bortoliny, S., Bose be, F., Bossú ah, M., Botjeay, S., Böttger v, B., Boyerbf, P., Braun Munzinger, L., Bravina bg, Bregant, Marco, T., Breitner v, M., Brozbi, R., Brunf, E., Bruna d, G. E., Bruno r, D., Budnikovbj, H., Buesching ab, O., Busch bk, Z., Buthelezi bl, D., Caffarri y, X., Cai bm, H., Cainesd, E., Calvo Villar bn, Camerini, Paolo, V., Canoa Roman f, 9, 1, G., Cara Romeoz, F., Carenaf, W., Carenaf, F., Carminati f, A., Casanova Díaz aw, M., Caselle f, J., Castillo Castellanos aj, V., Catanescu u, C., Cavicchioli f, P., Cerello n, B., Chang af, S., Chapeland f, J. L., Charvet aj, S., Chattopadhyaybe, S., Chattopadhyayi, M., Cherney bo, C., Cheshkovbp, B., Cheynis bp, E., Chiavassa n, V., Chibante Barroso f, D. D., Chinellato bq, P., Chochulaf, M., Chojnacki br, P., Christakoglou br, C. H., Christensen ar, P., Christiansen b, T., Chujo bt, C., Cicalo bu, L., Cifarelli o, F., Cindoloz, J., Cleymansbl, F., Coccetti ai, J. P., Coffina, S., Coli n, G., Conesa Balbastreaw, Z., Conesa del Valle aa, P., Constantinbk, Contin, Giacomo, J. G., Contrerasbv, T. M., Cormier at, Y., Corrales Morales ah, I., Cortés Maldonado bw, P., Cortese bx, M. R., Cosentino bq, F., Costaf, M. E., Cotallo az, E., Cresciobv, P., Crochetak, E., Cuautle by, L., Cunqueiro aw, G. D., Erasmo r, A., Dainesebz, H. H., Dalsgaard ar, A., Danuca, D., Dasbe, I., Dasbe, A., Dashcb, S., Dashn, S., De i, A., De Azevedo Moregula aw, G. O. V., de Barros cc, A., De Carocd, G., de Cataldo ce, J., de Cuveland q, A., De Falco cf, D., De Gruttolacd, N., De Marcon, S., De Pasquale cd, R., De Remigis n, R., de Rooij br, H., Delagrange aa, Y., Delgado Mercado bn, G., Dellacasa bx, A., Deloff cg, V., Demanovbj, E., Dénes g, A., Deppman cc, D., Di Bari r, C., Di Giglio r, S., Di Libertoch, A., Di Maurof, P., Di Nezza aw, T., Dietel ap, R., Divià f, Ø., Djuvsland a, A., Dobrin at, T., Dobrowolski cg, I., Domínguez by, B., Dönigus, O., Dordic bg, O., Driga aa, A. K., Dubeyi, J., Dubuisson f, L., Ducroux bp, P., Dupieux ak, A. K., Dutta Majumdar be, M. R., Dutta Majumdar i, D., Eliace, D., Emschermann ap, H., Engel v, H. A., Erdal ci, B., Espagnonbf, M., Estienne aa, S., Esumi bt, D., Evansan, S., Evrard f, G., Eyyubova bg, C. W., Fabjanf, D., Fabriscj, J., Faivre ac, D., Falchieri o, A., Fantoni aw, M., Fasel, R., Fearickbl, A., Fedunovaq, D., Fehlker a, V., Feketebi, D., Felea ca, G., Feofilovt, A., Fernández Téllez bw, A., Ferretti ah, R., Ferretti bx, M. A. S., Figueredo cc, S., Filchagin bj, R., Fini ce, D., Finogeev ck, F. M., Fionda r, E. M., Fiore r, M., Florisf, S., Foertsch bl, P., Foka, S., Fokin m, Fragiacomo, Enrico, M., Fragkiadakis cm, U., Frankenfeld, U., Fuchsf, F., Furanof, C., Furgetac, M., Fusco Girard cd, J. J., Gaardhøje ar, S., Gadratac, M., Gagliardi ah, A., Gagobn, M., Gallio ah, P., Ganoti cm, C., Garabatos, R., Gemmebx, J., Gerhardq, M., Germainaa, C., Geuna aj, A., Gheataf, M., Gheataf, B., Ghidini r, P., Ghosh i, M. R., Girard cn, G., Giraudon, P., Giubellino ah, E., Gladysz Dziadus ao, P., Glässel bk, R., Gomezco, L. H., González Trueba h, P., González Zamora az, H., González Santosbw, S., Gorbunovq, S., Gotovaccp, V., Grabski h, R., Grajcarekbk, A., Grelli br, A., Grigorasf, C., Grigorasf, V., Grigoriev bb, A., Grigoryancq, S., Grigoryan aq, B., Grinyovp, N., Grioncl, P., Grosb, J. F., Grosse Oetringhaus f, J. Y., Grossiord bp, Grosso, Raffaele, F., Guber ck, R., Guernane ac, C., Guerra Gutierrez bn, B., Guerzoni o, K., Gulbrandsen ar, T., Gunji cr, A., Guptaav, R., Gupta av, H., Gutbrod, Ø., Haaland a, C., Hadjidakisbf, M., Haiducca, H., Hamagaki cr, G., Hamar g, J. W., Harris d, M., Hartigab, D., Haschaw, D., Hasegan ca, D., Hatzifotiadou z, A., Hayrapetyan cq, M., Heideap, M., Heinz d, H., Helstrupci, A., Herghelegiu u, C., Hernández, G., Herrera Corral bv, N., Herrmannbk, K. F., Hetland ci, B., Hicksd, P. T., Hille d, B., Hippolyte a, T., Horaguchi bt, Y., Hori cr, P., Hristovf, I., Hˇrivnáˇcová bf, M., Huang a, S., Huber, T. J., Humanicw, D. S., Hwangc, R., Ichouaa, R., Ilkaevbj, I., Ilkivcg, M., Inababt, E., Incani cf, G. M., Innocenti ah, P. G., Innocenti f, M., Ippolitov m, M., Irfanj, C., Ivan, A., Ivanovt, M., Ivanov, V., Ivanov au, A., Jachołkowski f, P. M., Jacobsct, L., Jancurováaq, S., Jangal a, R., Janikbi, S. P., Jayarathna ba, S., Jena cu, L., Jirden f, G. T., Jonesan, P. G., Jonesan, P., Jovanovi ´c an, H., Jungk, W., Jungk, A., Juskoan, S., Kalcher q, P., Kaliˇnák al, M., Kaliskyap, T., Kalliokoski af, A., Kalweitcv, R., Kamermansbr, K., Kanaki a, E., Kang k, J. H., Kangcw, V., Kaplinbb, O., Karavichev ck, T., Karavicheva ck, E., Karpechevck, A., Kazantsevm, U., Kebschull v, R., Keidel cx, M. M., Khanj, A., Khanzadeev au, Y., Kharlovbc, B., Kileng ci, D. J., Kimaf, D. S., Kimk, D. W., Kim k, H. N., Kimk, J. H., Kimc, J. S., Kimk, M., Kimk, M., Kimcw, S., Kimc, S. H., Kimk, S., Kirsch f, I., Kisel v, S., Kiselevl, A., Kisiel f, J. L., Klaycy, J., Kleinbk, C., Klein Bösing ap, M., Kliemantab, A., Klovning a, A., Kluge f, M. L., Knichel, K., Kochbk, M. K., Köhler, R., Kolevatovbg, A., Kolojvari t, V., Kondratiev t, N., Kondratyeva bb, A., Konevskih ck, E., Korna´s ao, C., Kottachchi Kankanamge Don at, R., Kouran, M., Kowalski ao, S., Koxac, K., Kozlovm, J., Kral af, I., Králikal, F., Kramerab, I., Krauscv, T., Krawutschkebk, M., Kretz q, M., Krivda an, D., Krumbhorn bk, M., Krusax, E., Kryshenau, M., Krzewicki ay, Y., Kucheriaevm, C., Kuhn a, P. G., Kuijeray, P., Kurashvili cg, A., Kurepin ck, A. B., Kurepin ck, A., Kuryakinbj, S., Kushpil c, V., Kushpil c, M. J., Kweonbk, Y., Kwoncw, P., La Rocca am, P., Ladrón de Guevaraaz, V., Lafage bf, C., Larav, D. T., Larsen a, C., Lazzeroni an, Y., Le Bornec bf, R., Leabh, K. S., Leek, S. C., Leek, F., Lefèvre aa, J., Lehnert ab, L., Leistamf, M., Lenhardt aa, V., Lenti ce, I., León Monzónco, H., León Vargasab, P., Lévai g, X., Li cz, R., Lietava an, S., Lindal bg, V., Lindenstruth v, C., Lippmann f, M. A., Lisa w, L., Liua, V. R., Loggins at, V., Loginov bb, S., Lohnf, D., Lohner bk, C., Loizidesct, X., Lopezak, M., López Noriega bf, E., López Torres b, G., Løvhøiden bg, X. G., Lubk, P., Luettig ab, M., Lunardony, G., Luparello ah, L., Luquin aa, C., Luzzi f, K., Mabm, R., Mad, D. M., Madagodahettige Don ba, A., Maevskayack, M., Magerf, D. P., Mahapatra cb, A., Mairea, M., Malaev au, I., Maldonado Cervantes by, D., Mal’Kevich l, P., Malzacher, A., Mamonovbj, L., Manceauak, L., Mangotra av, V., Mankom, F., Mansoak, V., Manzari ce, Y., Maobm, J., Marešda, Margagliotti, Giacomo, A., Margotti z, A., Marín, I., Martashvili db, P., Martinengo f, M. I., Martínez bw, A., Martínez Davalos h, G., Martínez García aa, Y., Martynov p, A., Masaa, S., Masciocchi, M., Maseraah, A., Masoni bu, L., Massacrier bp, M., Mastromarco ce, A., Mastroserio f, Z. L., Matthews an, A., Matyja ao, D., Mayani by, G., Mazza n, M. A., Mazzoni ch, F., Meddi dc, A., Menchaca Rocha h, P., Mendez Lorenzo f, J., Mercado Pérezbk, P., Mereu n, Y., Miake bt, J., Midori dd, L., Milano ah, J., Milosevic bg, A., Mischke br, D., Mi´skowiec, C., Mitu ca, J., Mlynarz at, B., Mohantyi, L., Molnarf, L., Montaño Zetinabv, M., Montenon, E., Montesaz, M., Morando y, D. A., Moreira De Godoy cc, S., Morettoy, A., Morsch f, V., Muccifora aw, E., Mudniccp, H., Müller f, S., Muhuri i, M. G., Munhoz cc, J., Munozbw, L., Musaf, A., Musso n, B. K., Nandi cu, R., Naniaz, E., Nappi ce, C., Nattrass db, F., Navachr, S., Navin an, T. K., Nayaki, S., Nazarenko bj, G., Nazarov bj, A., Nedosekin l, F., Nendazbp, J., Newbyde, M., Nicassio r, B. S., Nielsenar, S., Nikolaev m, V., Nikolic x, S., Nikulin m, V., Nikulin au, B. S., Nilsen bo, M. S., Nilsson bg, F., Noferini z, G., Nooren br, N., Novitzky af, A., Nyaninm, A., Nyathacu, C., Nygaard ar, J., Nystranda, H., Obayashi dd, A., Ochirovt, H., Oeschlercv, S. K., Oh k, J., Oleniaczcn, C., Oppedisano n, A., Ortiz Velasquez by, G., Ortonaah, A., Oskarsson b, P., Ostrowski cn, I., Otterlundb, J., Otwinowski, G., Øvrebekk a, K., Oyamabk, K., Ozawacr, Y., Pachmayerbk, M., Pachr ax, F., Padilla ah, P., Pagano cd, G., Pai´c by, F., Painkeq, C., Pajaresad, S., Pal aj, S. K., Pal i, A., Palaha an, A., Palmeri ag, G. S., Pappalardo ag, W. J., Park, V., Paticchio ce, A., Pavlinovat, T., Pawlakcn, T., Peitzmannbr, D., Peresunkom, C. E., Pérez Lara ay, D., Perini f, D., Perrino r, W., Perytcn, A., Pesci z, V., Peskovf, Y., Pestovdf, A. J., Peters f, V., Petráˇcek ax, M., Petrisu, P., Petrovan, M., Petrovici u, C., Pettaam, Piano, Stefano, A., Piccotti n, M., Pikna bi, P., Pillot aa, O., Pinazza f, L., Pinsky ba, N., Pitz ab, F., Piuz f, D. B., Piyarathna at, R., Plattan, M., Płoskon´ ct, J., Pluta cn, T., Pocheptsov aq, S., Pochybova g, P. L. M., Podesta Lerma co, M. G., Poghosyan ah, K., Polák da, B., Polichtchouk bc, A., Popu, V., Pospíšil ax, B., Potukuchi av, S. K., Prasadat, R., Preghenella ai, F., Prino n, C. A., Pruneau at, I., Pshenichnov ck, G., Puddu cf, A., Pulvirenti am, V., Puninbj, M., Putišbd, J., Putschke d, E., Quercigh f, H., Qvigstad bg, A., Rachevski cl, A., Rademakers f, O., Rademakers f, S., Radomski bk, T. S., Räihäaf, J., Rakaf, A., Rakotozafindrabe aj, L., Ramello bx, A., Ramírez Reyesbv, M., Rammler ap, R., Raniwala dg, S., Raniwala dg, S. S., Räsänen af, K. F., Readdb, J. S., Real ac, K., Redlichcg, R., Renfordt ab, A. R., Reolonaw, A., Reshetinck, F., Rettig q, J. P., Revol f, K., Reygersbk, H., Ricaud cv, L., Riccati n, R. A., Ricci bz, M., Richtera, P., Riedlerf, W., Rieglerf, F., Riggi am, A., Rivetti n, M., Rodríguez Cahuantzi bw, D., Rohr q, D., Röhrich a, R., Romita, F., Ronchetti aw, P., Rosinský f, P., Rosnet ak, S., Rossegger f, A., Rossi y, F., Roukoutakis cm, S., Rousseau bf, C., Royaa, P., Roybe, A. J., Rubio Montero az, Rui, Rinaldo, I., Rusanovf, E., Ryabinkin m, A., Rybicki ao, S., Sadovskybc, K., Šafaˇrík f, R., Sahooy, P. K., Sahucb, P., Saizf, S., Sakai ct, D., Sakata bt, C. A., Salgadoad, T., Samanta i, S., Sambyal av, V., Samsonov au, L., Šándoral, A., Sandoval h, M., Sano bt, S., Sanocr, R., Santoap, R., Santoroce, J., Sarkamoaf, P., Saturnini ak, E., Scapparone z, F., Scarlassara y, R. P., Scharenbergdh, C., Schiauau, R., Schicker bk, C., Schmidt, H. R., Schmidt, S., Schreinerf, S., Schuchmann ab, J., Schukraftf, Y., Schutzaa, K., Schwarz, K., Schwedabk, G., Scioli o, E., Scomparinn, P. A., Scott an, R., Scottdb, G., Segato y, S., Senyukov bx, J., Seo k, S., Serci cf, E., Serradilla az, A., Sevcencoca, G., Shabratova aq, R., Shahoyan f, N., Sharma e, S., Sharma av, K., Shigaki dd, M., Shimomura bt, K., Shtejer b, Y., Sibiriakm, M., Siciliano ah, E., Sickingf, T., Siemiarczukcg, A., Silenzi o, D., Silvermyr ae, G., Simonetti f, R., Singaraju i, R., Singh av, B. C., Sinha i, T., Sinha be, B., Sitarbi, M., Sittabx, T. B., Skaali bg, K., Skjerdal a, R., Smakal ax, N., Smirnov d, R., Snellings ay, C., Søgaard ar, A., Soloviev bc, R., Soltzde, H., Sonc, M., Songcw, C., Soos f, F., Soramel y, M., Spyropoulou Stassinaki cm, B. K., Srivastavadh, J., Stachel bk, I., Stanca, G., Stefanek cg, G., Stefanini f, T., Steinbeckv, E., Stenlundb, G., Steynbl, D., Stocco aa, R., Stockab, M., Stolpovskiy bc, P., Strmenbi, A. A. P., Suaide cc, M. A., Subieta Vásquez ah, T., Sugitate dd, C., Suire bf, M., Šumbera c, T., Susa x, D., Swobodaf, T. J. M., Symons ct, A., Szanto de Toledocc, I., Szarkabi, A., Szostaka, C., Tagridis cm, J., Takahashi bq, J. D., Tapia Takaki bf, A., Taurof, M., Tavletf, G., Tejeda Muñoz bw, A., Telesca f, C., Terrevoli r, J., Thäder, D., Thomasbr, J. H., Thomas, R., Tieulent bp, A. R., Timmins at, D., Tlusty ax, A., Toia f, H., Torii dd, L., Toscano f, F., Tosello n, T., Traczykcn, D., Truesdale w, W. H., Trzaskaaf, A., Tumkinbj, R., Turrisi cj, A. J., Turveybo, T. S., Tveterbg, J., Uleryab, K., Ullaland a, A., Urascf, J., Urbánbd, G. M., Urciuoli ch, G. L., Usai cf, Vacchi, Andrea, M., Valaaq, L., Valencia Palomo bf, S., Vallero bk, N., van der Kolkay, M., van Leeuwen br, P., Vande Vyvre f, L., Vannucci bz, A., Vargasbw, R., Varmacu, M., Vasileioucm, A., Vasilievm, V., Vechernin t, Venaruzzo, Massimo, E., Vercellin ah, S., Vergara bw, R., Vernet di, M., Verweij br, L., Vickovic cp, G., Viesti y, O., Vikhlyantsev bj, Z., Vilakazi bl, O., Villalobos Baillie an, A., Vinogradovm, L., Vinogradov t, Y., Vinogradov bj, T., Virgili cd, Y. P., Viyogi i, A., Vodopyanov aq, K., Voloshin l, S., Voloshin at, G., Volpe r, B., von Haller f, D., Vranic, J., Vrlákovábd, B., Vulpescu ak, B., Wagnera, V., Wagnerax, R., Wan a, D., Wangbm, Y., Wangbk, Y., Wangbm, K., Watanabe bt, J. P., Wessels ap, U., Westerhoffap, J., Wiechula bk, J., Wiknebg, M., Wildeap, A., Wilk ap, G., Wilk cg, M. C. S., Williams z, B., Windelband bk, H., Yang aj, S., Yasnopolskiym, J., Yi dj, Z., Yinbm, H., Yokoyamabt, I. K., Yoo dj, X., Yuanbm, I., Yushmanovm, E., Zabrodin bg, C., Zampolli f, S., Zaporozhets aq, A., Zarochentsev t, P., Závadada, H., Zbroszczyk cn, P., Zelnicek v, A., Zeninbc, I., Zguraca, M., Zhalovau, X., Zhang bm, D., Zhoubm, A., Zichichi o, G., Zinovjev p, Y., Zoccarato bp, and M. Zynovyev, P.
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ALICE ,Pb ,central collisions - Abstract
Inclusive transverse momentum spectra of primary charged particles in Pb–Pb collisions at √sNN = 2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0–5% and 70–80% of the hadronic Pb–Pb cross section. The measured charged particle spectra in |η| < 0.8 and 0.3 < pT < 20 GeV/c are compared to the expectation in pp collisions at the same √sNN, scaled by the number of underlying nucleon–nucleon collisions. The comparison is expressed in terms of the nuclear modification factor RAA. The result indicates only weak medium effects (RAA ≈ 0.7) in peripheral collisions. In central collisions, RAA reaches a minimum of about 0.14 at pT = 6–7 GeV/c and increases significantly at larger pT . The measured suppression of high-pT particles is stronger than that observed at lower collision energies, indicating that a very dense medium is formed in central Pb–Pb collisions at the LHC.
- Published
- 2011
15. Freeze-out properties of multifragmentation events
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A. Chbihi, N. Le Neindre, J.D. Frankland, P. Lautesse, Bernard Tamain, Elio Rosato, O. Lopez, J. Moisan, E. Vient, Ad. R. Raduta, E. Galichet, S. Piantelli, F. Gagnon-Moisan, René Roy, R. Bougault, B. Borderie, R. Dayras, E. Bonnet, M. Pârlog, Mariano Vigilante, G. Lehaut, D. Mercier, D. Guinet, M. F. Rivet, J.P. Wieleczko, 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), Istituto Nazionale di Fisica Nucleare, Sezione di Firenze (INFN, Sezione di Firenze), Istituto Nazionale di Fisica Nucleare (INFN), Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Conservatoire National des Arts et Métiers [CNAM] (CNAM), Laboratoire de Physique Nucléaire, Université Laval [Québec] (ULaval), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (INFN, Sezione di Napoli), INDRA, 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), S., Piantelli, B., Borderie, E., Bonnet, N., Le Neindre, Raduta, A. d. R., M. F., Rivet, R., Bougault, A., Chbihi, R., Dayra, J. D., Frankland, E., Galichet, F., Gagnon Moisan, D., Guinet, P., Lautesse, G., Lehaut, O., Lopez, D., Mercier, J., Moisan, M., Parlog, Rosato, Elio, R., Roy, B., Tamain, E., Vient, Vigilante, Mariano, and J. P., Wielezcko
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Nuclear reaction ,Nuclear and High Energy Physics ,Hadron ,Elementary particle ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,central collisions ,Nuclear physics ,freeze-out properties estimated from fragment velocity distributions and charged particle energy spectra ,E = 32 ,0103 physical sciences ,25.70.-z, 25.70.Pq ,010306 general physics ,X) ,Physics ,010308 nuclear & particles physics ,comparison with a microcanonical statistical model ,Fermion ,Charged particle ,Baryon ,50 MeV/nucleon ,NUCLEAR REACTIONS natSn(129Xe ,Atomic physics ,Nucleon ,Excitation - Abstract
Expérience GANIL; International audience; Freeze-out properties of multifragmentation events produced in central 129Xe+natSn collisions at different beam energies (32, 39, 45 and 50 AMeV) were estimated by means of a simulation based on the experimental data collected by the 4π INDRA multidetector. A rapid increase (between 32 and 45 AMeV) of the fraction of particles emitted at freeze-out is deduced. The existence of a limitation of excitation energy for fragments around 3.0-3.5 AMeV is confirmed. A comparison with the results of a microcanonical statistical model is also performed to verify the overall physical coherence of the present approach.
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- 2008
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16. New approach of fragment charge correlations in $^{129}$Xe+$^{nat}$Sn central collisions
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L. Nalpas, O. Lopez, A. Van Lauwe, D. Cussol, C. Volant, Diane Doré, R. Dayras, J.L. Charvet, D. Durand, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
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Nuclear reaction ,50 MeV/n ,Nuclear and High Energy Physics ,Charge correlation analyses ,Spinodal decomposition ,129Xe+natSn ,FOS: Physical sciences ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,Bin ,Nuclear physics ,25.70.Pq ,24.60.Ky ,Correlation function ,0103 physical sciences ,Nuclear Experiment (nucl-ex) ,010306 general physics ,Nuclear Experiment ,Physics ,010308 nuclear & particles physics ,Plane (geometry) ,Random break-up simulations ,Charge (physics) ,Central collisions ,E=32 ,Yield (chemistry) ,Production (computer science) ,Nuclear reactions ,Atomic physics ,Indra multidetector - Abstract
A previous analysis of the charge (Z) correlations in the $\Delta Z-$ plane for Xe+Sn central collisions at 32 MeV/u has shown an enhancement in the production of equally sized fragments (low $\Delta Z$) which was interpreted as an evidence for spinodal decomposition. However the signal is weak and rises the question of the estimation of the uncorrelated yield. After a critical analysis of its robustness, we propose in this paper a new technique to build the uncorrelated yield in the charge correlation function. The application of this method to Xe+Sn central collision data at 32, 39, 45 and 50 MeV/u does not show any particular enhancement of the correlation function in any $\Delta Z$ bin., Comment: 23 pages, 9 figures, revised version with an added figure and minor changes. To appear in Nuclear Physics A
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- 2004
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17. Event-by-event fluctuations of the kaon to pion ratio in central Pb+Pb collisions at 158 GeV per Nucleon
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Antičić, Tome, Afanasiev, S. V., Bachler, J., Barna, D., Barnby, L. S., Bartke, J., Barton, R. A., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C. O., Boimska, B., Botje, M., Bracinik, J., Brady, F. P., Bramm, R., Brun, R., Buncic, P., Carr, L., Cebra, D., Cooper, G. E., Cramer, J. G., Csato, P., Eckardt, V., Eckhardt, F., Ferenc, D., Filip, P., Fischer, H. G., Fodor, Z., P. Foka, P. Freund, Gal, J., Gazdzicki, M., Georgopoulous, G., Gladysz, E., Harris, J.W., Hegyi, S., Hlinka, V., Hoehne, C., Igo, G., Ivanov, M., Jacobs, P., Janik, R., Jones, P. G., Kadija, Krešo, Kolesnikov, V. I., Kolleger, T., Kowalski, M., Lasiuk, B., Leeuwen van, M., Levai, P., Malakhov, A. I., Margetis, S., Markert, C., Mayes, W., Melkumov, G. L., Mischke, A., Molnar, J., Nelson, J. M., Odyniec, G., Palla, G., Panagiotou, A. D., Petridis, A., Pikna, M., Pinsky, L., Poskanzer, A. M., Prindle, D. J., Puhlhofer, F., Reid, J. G., Renfordt, R., Retyk, W., Ritter, H. G., Rohrich, D., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Schafer, E., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Snellings, R., Squier, G. T. A., Stock, R., Strmen, P., Strobele, H., Šuša, Tatjana, Szarka, I., Szentpetery, I., Sziklai, J., Toy, M., Trainor, T. A., Trentalange, S., Ullrich, T., Varga, D., Vassiliou, M., Veres, G., Vesztergombi, G., Voloshin, S., Vranić, Danilo, Wang, F., Weerasundara, D. D., Wenig, S., Wetzler., A., Whitten, C., Xu, N., Yates, T. A., Yoo, I. K., and Zimanyi, J.
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Physics ,Nuclear Theory ,event by event fluctuations ,kaon pion ratio ,central collisions ,Pb Pb ,nonstatistical fluctuations ,first order QCD phase transition ,second order QCD phase transition ,High Energy Physics::Experiment ,Nuclear Experiment - Abstract
We present the first measurement of fluctuations from event to event in the production of strange particles in collisions of heavy nuclei. The ratio of charged kaons to charged pions is determined for individual central Pb + Pb collisions. After accounting for the fluctuations due to detector resolution and finite number statistics we derive an upper limit on genuine nonstatistical fluctuations, which could be related to a first- or second-order QCD phase transition. Such fluctuations are shown to be very small.
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- 2001
18. Identification of baryon resonances in central heavy-ion collisions at energies between 1 and 2 AGeV
- Author
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Eskef, M., Pelte, D., Goebels, G., Häfele, E., Herrmann, N., Korolija, Milorad, Leifels, Y., Merlitz, H., Mohren, S., Stockmeier, M.R., Trzaska, M., Alard, J.P., Andronic, A., Averbeck, R., Basrak, Zoran, Bastid, N., Belyaev, I., Best, D., Buta, A., Čaplar, Roman, Cindro, Nikola, Coffin, J.P., Crochet, P., Dupieux, P., Dželalija, Mile, Fraysse, L., Fodor, Z., Genoux Lubain, A., Gobbi, A., Hildenbrand, K.D., Hong, B., Jundt, F., Keckemeti, J., Kirejczyk, M., Kotte, R., Kutsche, R., Lebedev, A., Manko, V., Mösner, J., Moisa, D., Neubert, W., Petrovici, M., Pinkenburg, C., Plettner, C., Pras, P., Rami, F., Ramillien, V., Reisdorf, W., Ritman, J.L., de Schauenburg, B., Schüll, D., Seres, Z., Sikora, B., Simion, V., Siwek-Wuilczynska, K., Smolyankin, V., Vasiliev, M.A., Wagner, P., Wang, G.S., Wisniewski, K., Wohlfarth, D., and Zhilin, A.
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central collisions ,baryon resonances ,heavy-ion ,temperature ,Nuclear Experiment - Abstract
The mass distributions of baryon resonances populated in near-central collisions of Au on Au and Ni on Ni are deduced by defolding the p (t) spectra of charged pions by a method which does not depend on a specific resonance shape. In addition the mass distributions of resonances are obtained from the invariant masses of (p. pi(+/-)) pairs. With both methods the deduced mass distributions are shifted by an average value of -60 MeV/c(2) relative to the mass distribution of the free Delta(1232)resonance, the distributions descent almost exponentially towards mass values of 2000 MeV/c(2). The observed differences between (p, pi(-)) and (p, pi(+)) pairs indicate a contribution of isospin I = 1/2 resonances. The attempt to consistently describe the deduced mass distributions and the reconstructed kinetic energy spectra of the resonances leads to new insights about the freeze out conditions, i.e. to rather low temperatures and large expansion velocities.
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- 1998
19. Charged pions from Ni on Ni collisions between 1 and 2 AGeV
- Author
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J. P. Alard, M. Korolija, Pascal Dupieux, H. Merlitz, V. Ramillien, M. Trzaska, N. Cindro, T. Wienold, James Ritman, V. Amouroux, F. Jundt, C. Pinkenburg, Y. Korchagin, Byung-Sik Hong, D. Moisa, J. Erö, B. Sikora, I. Belyaev, E. Häfele, P. Crochet, Alexandre Lebedev, A. Zhilin, D. Best, Z. Seres, W. Neubert, G. Goebels, Anton Andronic, M. Kirejczyk, Z. Basrak, M. Dželalija, D. Schüll, I. Legrand, S. Mohren, J. Biegansky, P. Koncz, Y. Leifels, V. T. Smolyankin, P. Pras, J. P. Coffin, K. Siwek-Wilczyńska, N. Herrmann, K. D. Hildenbrand, Fouad Rami, R. Kotte, D. Pelte, Christian Claude Kuhn, M. A. Vasiliev, V. Simion, Nicole Bastid, J. Kecskemeti, W. Reisdorf, A. Gobbi, D. Lambrecht, J. Mösner, A. Buta, G. Guillaume, A. Genoux-Lubain, Vladislav Manko, R. Čaplar, M. Eskef, Z. Fodor, Peter Wagner, Mihai Petrovici, U. Sodan, G.S. Wang, P. Fintz, C. Roy, D. Wohlfarth, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 FOPI
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Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Nuclear Theory ,FOS: Physical sciences ,01 natural sciences ,Nuclear physics ,Pion ,Heavy ion Physics ,Central Collisions ,Charged Pions Production ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,High Energy Physics::Experiment ,Nuclear Experiment (nucl-ex) ,010306 general physics ,Nuclear Experiment - Abstract
Charged pions from Ni + Ni reactions at 1.05, 1.45 and 1.93 AGeV are measured with the FOPI detector. The mean $\pi^{\pm}$ multiplicities per mean number of participants increase with beam energy, in accordance with earlier studies of the Ar + KCl and La + La systems. The pion kinetic energy spectra have concave shape and are fitted by the superposition of two Boltzmann distributions with different temperatures. These apparent temperatures depend only weakly on bombarding energy. The pion angular distributions show a forward/backward enhancement at all energies, but not the $\Theta = 90^0$ enhancement which was observed in case of the Au + Au system. These features also determine the rapidity distributions which are therefore in disagreement with the hypothesis of one thermal source. The importance of the Coulomb interaction and of the pion rescattering by spectator matter in producing these phenomena is discussed., Comment: 22 pages, Latex using documentstyle[12pt,a4,epsfig], to appear in Z. Phys.A
- Published
- 1997
20. Proton-proton correlations in central collisions of Ni+Ni at 1.93 AGeV and the space-time extent of the emission source
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A. Lebedev, M. Korolija, Y. Leifels, E. Haefele, I. Belyaev, V. Amouroux, Mihai Petrovici, V. Simion, U. Sodan, D. Wohlfarth, I. Legrand, S. Hoelbling, James Ritman, C. Plettner, Z. Fodor, J. Kecskemeti, M. Kirejczyk, J. P. Coffin, Y. Yatsunenko, S. Mohren, A. Gobbi, Christian Claude Kuhn, F. Jundt, G. Berek, Z. Basrak, C. Roy, G. Goebels, J. Biegansky, Byung-Sik Hong, D. Best, K. Siwek-Wilczyńska, W. Neubert, R. Dona, A. Genoux-Lubain, Peter Wagner, Vladislav Manko, A. Somov, P. Pras, N. Herrmann, T. Wienold, M. Eskef, K. D. Hildenbrand, G.S. Wang, C. Maazouzi, A. Zhilin, M. Dzelalija, P. Crochet, Fouad Rami, J. P. Alard, R. Čaplar, P. Fintz, J. Moesner, R. Kotte, D. Pelte, L. Fraysse, A. Buta, Nicole Bastid, G. Guillaume, D. Schuell, Z. Seres, W. Reisdorf, Pascal Dupieux, H. Merlitz, M. Trzaska, N. Cindro, L. Tizniti, C. Pinkenburg, M.A. Vasilev, and B. Sikora
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Nuclear reaction ,Physics ,Nuclear and High Energy Physics ,Proton ,Hadron ,Radius ,Rest frame ,Heavy ion Physics ,Central Collisions ,Proton-proton correlations ,Nuclear physics ,Baryon ,Correlation function (statistical mechanics) ,Atomic physics ,Nucleon ,Nuclear Experiment - Abstract
Small-angle correlations of proton pairs produced in central Ni+Ni collisions at a beam energy of 1.93 A.GeV are investigated with the FOPI detector system at GSI Darmstadt. Simultaneous comparison of longitudinal and transverse correlation functions with the predictions of the Koonin model allows to unravel the space-time ambiguity of the source extension. The determination of the source rest frame is found essential for the identification of this effect. For the present system, the selection of central events comprising about 8 % of the total cross section allows for the isolation of a compact source in momentum space which is centered around the c.m. velocity of the colliding nuclei. Taking into account the strong collective expansion of the participant zone, which introduces a reduction of the extracted source radius of more than 30 %, r.m.s. radius and emission time parameters of R-rms = (4.2 +/- 1.2) fm and t(rms) = (11(-5)(+7)) fm/c are extracted, respectively. In contrast, the analysis of the angle-integrated correlation function mixes the spatial and temporal size of the source and gives an upper limit R-rms = (7.0 +/- 0.8) fm of the source radius.
- Published
- 1997
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21. Production ofψ particles in N-N collisions and largeP T phenomenon
- Author
-
Chavda, L K and Narayan, D S
- Published
- 1976
- Full Text
- View/download PDF
Catalog
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