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1. Symmetry energy investigation with pion production from Sn+Sn systems

Author

G. Jhang, J. Estee, J. Barney, G. Cerizza, M. Kaneko, J.W. Lee, W.G. Lynch, T. Isobe, M. Kurata-Nishimura, T. Murakami, C.Y. Tsang, M.B. Tsang, R. Wang, D.S. Ahn, L. Atar, T. Aumann, H. Baba, K. Boretzky, J. Brzychczyk, N. Chiga, N. Fukuda, I. Gasparic, B. Hong, A. Horvat, K. Ieki, N. Inabe, Y.J. Kim, T. Kobayashi, Y. Kondo, P. Lasko, H.S. Lee, Y. Leifels, J. Łukasik, J. Manfredi, A.B. McIntosh, P. Morfouace, T. Nakamura, N. Nakatsuka, S. Nishimura, R. Olsen, H. Otsu, P. Pawłowski, K. Pelczar, D. Rossi, H. Sakurai, C. Santamaria, H. Sato, H. Scheit, R. Shane, Y. Shimizu, H. Simon, A. Snoch, A. Sochocka, Z. Sosin, T. Sumikama, H. Suzuki, D. Suzuki, H. Takeda, S. Tangwancharoen, H. Toernqvist, Y. Togano, Z.G. Xiao, S.J. Yennello, J. Yurkon, Y. Zhang, Maria Colonna, Dan Cozma, Paweł Danielewicz, Hannah Elfner, Natsumi Ikeno, Che Ming Ko, Justin Mohs, Dmytro Oliinychenko, Akira Ono, Jun Su, Yong Jia Wang, Hermann Wolter, Jun Xu, Ying-Xun Zhang, and Zhen Zhang

Subjects
Physics, QC1-999
Abstract

In the past two decades, pions created in the high density regions of heavy ion collisions have been predicted to be sensitive at high densities to the symmetry energy term in the nuclear equation of state, a property that is key to our understanding of neutron stars. In a new experiment designed to study the symmetry energy, the multiplicities of negatively and positively charged pions have been measured with high accuracy for central 132Sn+124Sn, 112Sn+124Sn, and 108Sn+112Sn collisions at E/A=270 MeV with the SπRIT Time Projection Chamber. While individual pion multiplicities are measured to 4% accuracy, those of the charged pion multiplicity ratios are measured to 2% accuracy. We compare these data to predictions from seven major transport models. The calculations reproduce qualitatively the dependence of the multiplicities and their ratios on the total neutron and proton number in the colliding systems. However, the predictions of the transport models from different codes differ too much to allow extraction of reliable constraints on the symmetry energy from the data. This finding may explain previous contradictory conclusions on symmetry energy constraints obtained from pion data in Au+Au system. These new results call for still better understanding of the differences among transport codes, and new observables that are more sensitive to the density dependence of the symmetry energy.

Published
2021
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2. CBM Collaboration

Author

T. Ablyazimov, A. Abuhoza, R. Adak, J. Adamczewski-Musch, M. Adamczyk, M.M. Aggarwal, Z. Ahammed, F. Ahmad, N. Ahmad, S. Ahmad, A. Akindinov, P. Akishin, E. Akishina, T. Akishina, V. Akishina, M. Al-Turany, E. Alexandrov, I. Alexandrov, S. Amar-Youcef, M. Anđelić, O. Andreeva, C. Andrei, A. Andronic, Yu. Anisimov, H. Appelshäuser, A. Arend, D. Argintaru, E. Atkin, S. Avdeev, R. Averbeck, M.D. Azmi, V. Baban, M. Bach, E. Badura, S. Baginyan, T. Balle, T. Balog, S. Bandyopadhyay, P. Banerjee, N. Baranova, T. Barczyk, D. Bartoş, S. Bashir, Z. Basrak, M. Baszczyk, O. Batenkov, V. Baublis, C. Baumann, M. Baznat, K.-H. Becker, T. Bel, S. Belogurov, J. Bendarouach, I. Berceanu, A. Bercuci, E. Berdermann, A. Berdnikov, Y. Berdnikov, R. Berendes, C. Bergmann, D. Bertini, O. Bertini, C. Beşliu, O. Bezshyyko, P.P. Bhaduri, A. Bhasin, A.K. Bhati, B. Bhattacharjee, A. Bhattacharyya, T.K. Bhattacharyya, S. Biswas, D. Blau, C. Blume, Yu. Bocharov, S. Böttger, M. Borysova, T. Breitner, U. Brüning, J. Brzychczyk, A. Bubak, H. Büsching, A. Bychkov, A. Byszuk, Xu Cai, M. Cãlin, Ping Cao, R. Čaplar, G. Caragheorgheopol, I. Carević, V. Cătănescu, A. Chakrabarti, S. Chatterji, Sanatan Chattopadhyay, Subhasis Chattopadhyay, Hongfang Chen, Jianping Cheng, V. Chepurnov, S. Chernenko, A. Chernogorov, Kyung-Eon Choi, M.I. Ciobanu, G. Claus, F. Constantin, V. Covlea, M. Csanád, N. D'Ascenzo, S. Das, K. Davkov, V. Davkov, J. de Cuveland, B. Debnath, D. Dementiev, Zhi Deng, H. Deppe, I. Deppner, O. Derenovskaya, C.A. Deveaux, M. Deveaux, K. Dey, M. Dey, P. Dillenseger, V. Dobyrn, D. Doering, A. Dorokhov, A. Drozd, A.K. Dubey, S. Dubnichka, A. Dubnichkova, M. Dürr, W. Dulinski, L. Dutka, M. Dželalija, D. Emschermann, H. Engel, V. Eremin, T. Eşanu, J. Eschke, D. Eschweiler, Jongsik Eum, Huanhuan Fan, O. Fateev, I. Filozova, D. Finogeev, P. Fischer, H. Flemming, U. Frankenfeld, V. Friese, E. Friske, I. Fröhlich, J. Frühauf, Á. Fülöp, J. Gajda, T. Galatyuk, A. Galkin, V. Galkin, G. Gangopadhyay, C. García Chávez, I. Gašparić, J. Gebelein, P. Ghosh, S.K. Ghosh, M. Goffe, L. Golinka-Bezshyyko, V. Golovatyuk, S. Golovnya, V. Golovtsov, M. Golubeva, D. Golubkov, A. Gómez Ramírez, S. Gorbunov, S. Gorokhov, D. Gottschalk, P. Gryboś, A. Grzeszczuk, F. Guber, K. Gudima, A. Gupta, Yu. Gusakov, A. Haldar, S. Haldar, H. Hartmann, J. Hehner, K. Heidel, N. Heine, E. Hellbär, A. Herghelegiu, N. Herrmann, B. Heß, J.M. Heuser, A. Himmi, C. Höhne, R. Holzmann, Guangming Huang, Xinjie Huang, J. Hutsch, D. Hutter, E. Iakovleva, A. Ierusalimov, E.-M. Ilgenfritz, M. Irfan, M. Ivanov, Valery Ivanov, Victor Ivanov, Vladimir Ivanov, A. Ivashkin, K. Jaaskelainen, H. Jahan, V. Jain, V. Jakovlev, T. Janson, A. Jipa, I. Kadenko, B. Kämpfer, S. Kalcher, V. Kalinin, K.-H. Kampert, Tae Im Kang, E. Kaptur, R. Karabowicz, O. Karavichev, T. Karavicheva, D. Karmanov, V. Karnaukhov, E. Karpechev, K. Kasiński, G. Kasprowicz, M. Kaur, A. Kazantsev, U. Kebschull, G. Kekelidze, M.M. Khan, S.A. Khan, A. Khanzadeev, F. Khasanov, A. Khvorostukhin, V. Kirakosyan, M. Kirejczyk, A. Kiryakov, M. Kiš, I. Kisel, P. Kisel, S. Kiselev, A. Kiss, T. Kiss, P. Klaus, R. Kłeczek, Ch. Klein-Bösing, V. Kleipa, P. Kmon, K. Koch, L. Kochenda, P. Koczoń, W. König, M. Kohn, B.W. Kolb, A. Kolosova, B. Komkov, J.M. Kopfer, M. Korolev, I. Korolko, R. Kotte, A. Kotynia, A. Kovalchuk, S. Kowalski, M. Koziel, G. Kozlov, P. Kravtsov, E. Krebs, C. Kreidl, D. Kresan, G. Kretschmar, M. Kretz, M. Krieger, E. Kryshen, W. Kucewicz, L. Kudin, A. Kugler, I. Kulakov, J. Kunkel, A. Kurepin, P. Kurilkin, V. Kushpil, V. Kyva, V. Ladygin, C. Lara, P. Larionov, A. Laso Garcia, E. Lavrik, I. Lazanu, A. Lebedev, S. Lebedev, E. Lebedeva, J. Lehnert, J. Lehrbach, F. Lemke, Cheng Li, Jin Li, Qiyan Li, Yuanjing Li, Yulan Li, V. Lindenstruth, S. Linev, B. Linnik, E. Litvinenko, Feng Liu, I. Lobanov, E. Lobanova, S. Löchner, P.-A. Loizeau, J.A. Lucio Martínez, A. Lymanets, A. Maevskaya, S. Mahajan, D.P. Mahapatra, T. Mahmoud, P. Maj, Z. Majka, A. Malakhov, E. Malankin, D. Malkevich, O. Malyatina, H. Malygina, S. Mandal, V. Manko, S. Manz, V. Marin, A.M. Marin Garcia, J. Markert, S. Masciocchi, T. Matulewicz, M. Merkin, V. Mialkovski, J. Michel, N. Miftakhov, K. Mikhailov, V. Mikhaylov, B. Milanović, V. Militsija, M.F. Mir, D. Miskowiec, T. Morhardt, W.F.J. Müller, C. Müntz, Yu. Murin, R. Najman, L. Naumann, T. Nayak, A. Nedosekin, B. Neumann, W. Niebur, V. Nikulin, D. Normanov, M. Nüssle, A. Oancea, Kunsu Oh, Y. Onishchuk, D. Osipov, G. Ososkov, D. Ossetski, P. Otfinowski, E. Ovcharenko, S. Pal, I. Panasenko, N.R. Panda, S. Parzhitskiy, C. Pauly, Haiping Peng, I. Peric, D. Peshekhonov, V. Peshekhonov, V. Petráček, M. Petriş, A. Petrovici, M. Petrovici, A. Petrovskiy, O. Petukhov, K. Piasecki, J. Pieper, J. Pietraszko, R. Płaneta, E. Plekhanov, V. Plotnikov, V. Plujko, J. Pluta, V. Poliakov, P. Polozov, A. Pop, V. Popov, V. Pospisil, B.V.K.S. Potukuchi, J. Pouryamout, K. Poźniak, A. Prakash, M. Prokudin, I. Pshenichnov, M. Pugach, V. Pugatch, S. Querchfeld, L. Radulescu, S. Raha, W. Raja, F. Rami, R. Raniwala, S. Raniwala, A. Raportirenko, J. Rautenberg, J. Rauza, R. Ray, S. Razin, P. Reichelt, S. Reinecke, A. Reshetin, C. Ristea, O. Ristea, F. Roether, R. Romaniuk, A. Rost, E. Rostchin, I. Rostovtseva, A. Roy, J. Rożynek, Yu. Ryabov, V. Rykalin, A. Sadovsky, S. Sadovsky, R. Sahoo, P.K. Sahu, J. Saini, S. Samanta, S.S. Sambyal, V. Samsonov, J. Sánchez Rosado, S. Sau, V. Saveliev, S. Schatral, C. Schiaua, C.J. Schmidt, H.R. Schmidt, K. Schmidt, K. Schweda, A. Scurtu, F. Seck, S. Seddiki, I. Selyuzhenkov, A. Semennikov, A. Senger, P. Senger, A. Shabunov, Ming Shao, M.K. Sharma, N. Shumeiko, V. Shumikhin, B. Sikora, A. Simakov, C. Simon, C. Simons, R.N. Singaraju, A.K. Singh, B.K. Singh, C.P. Singh, V. Singhal, K. Siwek-Wilczyńska, L. Škoda, I. Skwira-Chalot, I. Som, Jihye Song, I. Sorokin, Z. Sosin, D. Soyk, P. Staszel, A. Stavinskiy, E. Stephan, D. Storozhyk, M. Strikhanov, S. Strohauer, J. Stroth, C. Sturm, R. Sultanov, Yongjie Sun, O. Svoboda, R. Szczygieł, R. Talukdar, Zebo Tang, M. Tanha, J. Tarasiuk, O. Tarassenkova, M.-G. Târzilă, V. Tiflov, T. Tischler, P. Tlustý, A. Toia, T. Tolyhi, N. Topil'skaya, C. Trageser, P. Trivedy, I. Tsakov, Yu. Tsyupa, A. Turowiecki, F. Uhlig, E. Usenko, I. Valin, T. Vasiliev, I. Vassiliev, E. Verbitskaya, W. Verhoeven, A. Veshikov, R. Visinka, Y.P. Viyogi, S. Volkov, Yu. Volkov, A. Vorobiev, A. Voronin, V. Vovchenko, E. Vznuzdaev, M. Vznuzdaev, Dong Wang, Yaping Wang, Wang Yi, C. Wendisch, J.P. Wessels, M. Wiebusch, J. Wiechula, B. Wiedemann, D. Wielanek, A. Wieloch, N. Winckler, M. Winter, K. Wiśniewski, D. Wohlfeld, Gy. Wolf, Won Sanguk, J. Wüstenfeld, Changzhou Xiang, Xu Nu, Jun-Gyu Yi, Zhongbao Yin, In-Kwon Yoo, Qian Yue, B. Yuldashev, I. Yushmanov, W. Zabołotny, Yu. Zaitsev, Yu. Zanevsky, M. Zhalov, Ya Peng Zhang, Yifei Zhang, Daicui Zhou, Xianglei Zhu, A. Zinchenko, W. Zipper, M. Żoładź, P. Zrelov, V. Zryuev, P. Zumbruch, and M. Zyzak

Subjects
Nuclear and High Energy Physics
Published
2014
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3. ASY-EOS experiment at GSI: investigating the symmetry enenrgy at supra-satutation densities

Author

P. Russotto, M. Chartier, M. D. Cozma, E. De Filippo, A. Le Fevre, S. Gannon, A. Gašsparić, M. Kiš, S. Kupny, Y. Leifels, R. Lemmon, Q. Li, J. Lukasik, P. Marini, P. Pawlowski, S. Santoro, W. Trautmann, M. Veselsky, L. Acosta, M. Adamczyk, A. Al Ajlan, M. Al Garawi, S. Al Homaidhi, F. Amorini, L. Auditore, T. Aumann, Y. Ayyad, V. Baran, Z. Basrak, R. Bassini, J. Benlliure, C. Boiano, C. Boisjoli, K. Boretzky, J. Brzychczyk, A. Budzanowski, G. Cardella, P. Cammarata, Z. Chajecki, A. Chbihi, M. Colonna, B. Czech, M. Di Toro, M. Famiano, V. Greco, L. Grassi, C. Guazzoni, P. Guazzoni, M. Heil, L. Heilborn, R. Introzzi, T. Isobe, K. Kezzar, A. Krasznahorskay, N. Kurz, E. La Guidara, G. Lanzalone, P. Lasko, W. G. Lynch, Z. Matthews, L. May, T. Minniti, M. Mostazo, A. Pagano, M. Papa, S. Pirrone, R. Pleskac, G. Politi, F. Porto, R. Reifarth, W. Reisdorf, F. Riccio, F. Rizzo, D. Rossi, H. Simon, I. Skwirczynska, Z. Sosin, L. Stuhl, A. Trifirò, M. Trimarchi, M. B. Tsang, G. Verde, A. Wieloch, P. Wigg, H. H. Wolter, P. Wu, S. Yennello, P. Zambon, L. Zetta, M. Zoric, LOMBARDO, IVANO, ROSATO, ELIO, VIGILANTE, MARIANO, S. Lunardi, P.G. Bizzeti, C. Bucci, M. Chiari, A. Dainese, P. Di Nezza, R. Menegazzo, A. Nannini, C. Signorini, J.J. Valiente-Dobon, P., Russotto, M., Chartier, M. D., Cozma, E., De Filippo, A., Le Fevre, S., Gannon, A., Gašsparić, M., Kiš, S., Kupny, Y., Leifel, R., Lemmon, Q., Li, J., Lukasik, P., Marini, P., Pawlowski, S., Santoro, W., Trautmann, M., Veselsky, L., Acosta, M., Adamczyk, A., Al Ajlan, M., Al Garawi, S., Al Homaidhi, F., Amorini, L., Auditore, T., Aumann, Y., Ayyad, V., Baran, Z., Basrak, R., Bassini, J., Benlliure, C., Boiano, C., Boisjoli, K., Boretzky, J., Brzychczyk, A., Budzanowski, G., Cardella, P., Cammarata, Z., Chajecki, A., Chbihi, M., Colonna, B., Czech, M., Di Toro, M., Famiano, V., Greco, L., Grassi, C., Guazzoni, P., Guazzoni, M., Heil, L., Heilborn, R., Introzzi, T., Isobe, K., Kezzar, A., Krasznahorskay, N., Kurz, E., La Guidara, G., Lanzalone, P., Lasko, Lombardo, Ivano, W. G., Lynch, Z., Matthew, L., May, T., Minniti, M., Mostazo, A., Pagano, M., Papa, S., Pirrone, R., Pleskac, G., Politi, F., Porto, R., Reifarth, W., Reisdorf, F., Riccio, F., Rizzo, Rosato, Elio, D., Rossi, H., Simon, I., Skwirczynska, Z., Sosin, L., Stuhl, A., Trifirò, M., Trimarchi, M. B., Tsang, G., Verde, Vigilante, Mariano, A., Wieloch, P., Wigg, H. H., Wolter, P., Wu, S., Yennello, P., Zambon, L., Zetta, and M., Zoric

Subjects
flow, NUCLEAR COLLISIONS
Abstract

The elliptic-flow ratio of neutrons with respect to protons or light complex particles in reactions of heavy-ions at pre-relativistic energies has been proposed as an observable sensitive to the strength of the symmetry term of the nuclear equation of state at supra-saturation densities. The results obtained from the existing FOPI/LAND data for 197Au+197Au collisions at 400 MeV/nucleon in comparison with the UrQMD model simulations favoured a moderately soft symmetry term, but suffer from a considerable statistical uncertainty. These results have been confirmed by an independent analysis based on the Tübingen QMD simulations. In order to obtain an improved data set for Au+Au collisions and to extend the study to other systems, a new experiment was carried out at the GSI laboratory by the ASY-EOS collaboration. The present status of the data analysis is reported

Published
2014

4. The ASY-EOS experiment at GSI: Constraining the symmetry energy at supra-saturation densities

Author

P. Russotto, M. Chartier, M.D. Cozma, E. De Filippo, A. Le Fèvre, S. Gannon, I. Gašparić, M. Kiš, S. Kupny, Y. Leifels, R.C. Lemmon, Q. Li, J. Łukasik, P. Marini, P. Pawłowski, W. Trautmann, L. Acosta, M. Adamczyk, A. Al-Ajlan, M. Al-Garawi, S. Al-Homaidhi, F. Amorini, L. Auditore, T. Aumann, Y. Ayyad, V. Baran, Z. Basrak, R. Bassini, J. Benlliure, C. Boiano, M. Boisjoli, K. Boretzky, J. Brzychczyk, A. Budzanowski, G. Cardella, P. Cammarata, Z. Chajecki, A. Chbihi, M. Colonna, B. Czech, M. Di Toro, M. Famiano, V. Greco, L. Grassi, C. Guazzoni, P. Guazzoni, M. Heil, L. Heilborn, R. Introzzi, T. Isobe, K. Kezzar, A. Krasznahorkay, N. Kurz, E. La Guidara, G. Lanzalone, P. Lasko, I. Lombardo, W.G. Lynch, Z. Matthews, L. May, T. Minniti, M. Mostazo, A. Pagano, M. Papa, S. Pirrone, R. Pleskac, G. Politi, F. Porto, R. Reifarth, W. Reisdorf, F. Riccio, F. Rizzo, E. Rosato, D. Rossi, S. Santoro, H. Simon, I. Skwirczynska, Z. Sosin, L. Stuhl, A. Trifirò, M. Trimarchi, M.B. Tsang, G. Verde, M. Veselsky, M. Vigilante, A. Wieloch, P. Wigg, H.H. Wolter, P. Wu, S. Yennello, P. Zambon, L. Zetta, M. Zoric, Borderie, B., Russotto, P., Chartier, M., Cozma, M. D., De Filippo, E., Le Fever, A., Gannon, S., Gǎsparíc, I., Kǐs, M., Kupny, S., Leifels, Y., Lemmon, R. C., Li, Q., Lukasik, J., Marini, P., Pawlowski, P., Trautmann, W., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Baran, V., Basrak, Z., Bassini, R., Benlliure, J., Boiano, C., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Cardella, G., Cammarata, P., Chajecki, Z., Chbihi, A., Colonna, M., Czech, B., Di Toro, M., Famiano, M., Greco, V., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Krasznahorkay, A., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Lombardo, I., Lynch, W. G., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Papa, M., Pirrone, S., Pleskac, R., Politi, G., Porto, F., Reifarth, R., Reisdorf, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trifiro, A., Trimarchi, M., Tsang, M. B., Verde, G., Veselsky, M., Vigilante, M., Wieloch, A., Wigg, P., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., Zoric, M., Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), 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
Physics and Astronomy (all), sezele, Physics, QC1-999, Nuclear Theory, ddc:530, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The elliptic-flow ratio of neutrons with respect to protons or lightcomplex particles in reactions of heavy ions at pre-relativistic energieshas been proposed as an observable sensitive to the strength of thesymmetry term of the nuclear equation of state at supra-saturationdensities. In the ASY-EOS experiment at the GSI laboratory, flows ofneutrons and light charged particles were measured for 197Au+197Au,96Zr+96Zr and 96Ru+96Ru collisions at 400 MeV/nucleon with theLarge Area Neutron Detector LAND as part of a setup with severaladditional detection systems used for the event characterization. Flowresults obtained for the Au+Au system, in comparison with predictionsof the UrQMD transport model, confirm the moderately soft to lineardensity dependence of the symmetry energy deduced from the earlierFOPI-LAND data.

Published
2015
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5. Results from the BRAHMS experiment at RHIC

Author

D R$ouml$hrich for the BRAHMS Collaboration, I G Bearden, D Beavis, C Besliu, Y Blyakhman, J Brzychczyk, B Budick, H B$oslash$ggild, C Chasman, C H Christensen, P Christiansen, J Cibor, R Debbe, J J Gaardh$oslash$je, M Germinario, K Grotowski, K Hagel, O Hansen, A Holm, A K Holme, H Ito, E Jakobsen, A Jipa, J I Jordre, F Jundt, C E J$oslash$rgensen, T Keutgen, E J Kim, T Kozik, T M Larsen, J H Lee, Y K Lee, G L$oslash$vh$oslash$iden, Z Majka, A Makeev, B McBreen, M Murray, J Natowitz, B S Nielsen, K Olchanski, J Olness, D Ouerdane, R P$lslash$aneta, F Rami, D R$ouml$hrich, B Samset, D Sandberg, S Sanders, R A Sheetz, Z Sosin, P Staszel, T F Thorsteinsen, T S Tveter, F Videb$aelig$k, R Wada, A Wieloch, and I S Zgura

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Antiproton, Pseudorapidity, Rapidity, Multiplicity (chemistry), Relativistic Heavy Ion Collider, Charged particle, Late summer
Abstract

Results from the BRAHMS Collaboration for the inaugural physics run with the relativistic heavy ion collider (RHIC), Au + Au collisions at √sNN = 130 GeV in the late summer of 2000, and some results of the very first data from the summer of 2001 at √sNN = 200 GeV are presented. Here the main focus is on the determination of the pseudorapidity distribution of charged particles as a function of collision centrality and on the measurement of the antiproton to proton and the K− to K+ ratios as a function of rapidity. The pseudorapidity density at midrapidity reaches dN(ch)/dη = 553 ± 36 for the most central collisions (0–5%) at √sNN = 130 GeV; the corresponding number for a higher energy is dN(ch)/dη = 632 ± 36, demonstrating an increase in multiplicity of about 14%. The measured antiproton/proton ratios peak at midrapidity around N()/N(p) = 0.64 ± 0.06 and drop to 0.41 ± 0.04 at y ≈ 2 for √sNN = 130 GeV reactions; the K− to K+ ratios are 0.90 ± 0.06 (y ≈ 0) and 0.83 ± 0.1 (y ≈ 2.5).

Published
2002
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6. Charged particle densities from Au+Au collisions at =130 GeV

Author

I.G Bearden, D Beavis, C Besliu, Y Blyakhman, J Brzychczyk, B Budick, H Bøggild, C Chasman, C.H Christensen, P Christiansen, J Cibor, R Debbe, J.J Gaardhøje, K Grotowski, K Hagel, O Hansen, A Holm, A.K Holme, H Ito, E Jakobsen, A Jipa, J.I Jørdre, F Jundt, C.E Jørgensen, T Keutgen, E.J Kim, T Kozik, T.M Larsen, J.H Lee, Y.K Lee, G Løvhøiden, Z Majka, A Makeev, E McBreen, M Murray, J Natowitz, B.S Nielsen, K Olchanski, J Olness, D Ouerdane, R Płaneta, F Rami, D Röhrich, B.H Samset, S.J Sanders, R.A Sheetz, Z Sosin, P Staszel, T.F Thorsteinsen, T.S Tveter, F Videbæk, R Wada, A Wieloch, and I.S Zgura

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Range (particle radiation), Pseudorapidity, Particle, High Energy Physics::Experiment, Rapidity, Multiplicity (mathematics), Nuclear Experiment, Nucleon, Scaling, Charged particle
Abstract

We present charged particle densities as a function of pseudorapidity and collision centrality for the 197Au+197Au reaction at sqrt{s_{NN}}=130 GeV. An integral charged particle multiplicity of 3860+/-300 is found for the 5% most central events within the pseudorapidity range -4.7

Published
2001
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7. III. A stochastic two-stage reaction model for heavy-ion collisions

Author

Z. Sosin

Subjects
Physics, Nuclear and High Energy Physics, Continuum (measurement), Stochastic modelling, Nuclear Theory, Hadron, Nuclear physics, Reaction model, Nuclear fusion, Heavy ion, Atomic physics, Hot particle, Nuclear Experiment, Nucleon
Abstract

We propose a two-stage, stochastic model of heavy-ion reactions. Nucleons becoming participants by mean-field effects or by nucleon-nucleon interactions are transferred to definite final states, creating a PLF, a TLF, clusters, or escaping to continuum. Nucleon transfer probabilities are governed by state densities. In this way different hot particle sources are created which afterwards decay by particle emission.

Published
2001
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8. PLF fragmentation in the 40Ca+40Ca reaction at 35 MeV/nucleon

Author

D. Heuer, D. Benchekroun, A. Wieloch, A.J. Cole, A. Chabane, M. Charvet, Brigitte Cheynis, J.B. Viano, R. Płaneta, A. Demeyer, A. Giorni, W. Gawlikowicz, E. Bisquer, J. Brzychczyk, L. Vagneron, K. Grotowski, Z. Sosin, Piotr Pawłowski, P. Lautesse, P. Désesquelles, Annick Lleres, L. Lebreton, E. Gerlic, S. Micek, D. Guinet, P. Hachaj, and M. Stern

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Fragmentation (mass spectrometry), Nucleon
Published
2001
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9. Missing momentum vector in the 197Au(20Ne;F1,F2PLF) reaction at 15 MeV/u

Author

R.H. Siemssen, K. Grotowski, Z. Sosin, J. Wilczyński, H.K.W. Leegte, J. Brzychczyk, R. Płaneta, Piotr Pawłowski, S. Micek, A. Wieloch, K. Siwek-Wilczyńska, and H. W. Wilschut

Subjects
Nuclear reaction, Nuclear physics, Physics, Momentum, Nuclear and High Energy Physics, Fission, Systematic deviation, Beam direction, Atomic physics, Nuclear Experiment, Coincidence, Analysis method, Ion
Abstract

Projectile-like fragments (PLF's) emitted in damped collisions of 15 MeV/u 20Ne ions with 197Au were observed in coincidence with two fission fragments. For given detection angles of the PLF's differential and energy-integrated fission probabilities were obtained and the average missing momentum vectors were deduced by using improved analysis methods of the fission fragment angular correlation. The average missing momentum vectors were found to point in the direction of the observed PLF, with a systematic deviation towards beam direction for larger mass transfers. The missing momentum thus appears to mainly originate from the sequential decay of the PLF's.

Published
1995
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10. Intermediate-mass fragments in 14N + 159Tb/natAg/natCu reactions at 22 MeV/u

Author

K. Grotowski, J.D. Hinnefeld, J. Lukasik, R.H. Siemssen, H. W. Wilschut, S. Micek, Tomasz Kozik, R. Płaneta, A. Wieloch, Ee Koldenhof, H.K.W. Łeegte, Z. Sosin, and J. Brzychczyk

Subjects
Nuclear reaction, Physics, Nuclear physics, Nuclear and High Energy Physics, Dissipative system, Atomic physics, Nuclear Experiment, Spectral line
Abstract

The yields of intermediate-mass fragments from the reactions 14N + 159Tb/natAg/ natCu have been measured at 22 MeV/u. A complete set of double-differential cross sections d 2 σ/ d E d Ω ranging from 15° to 165° and with low-energy thresholds has been obtained. The evolution of the intermediate-mass spectra from quasi-elastic via more dissipative reactions towards evaporation can be followed and has been compared with a phenomenological random-walk model. For the system studied, the results suggest damped collisions as the only source for the emission of intermediate-mass fragments in the dissipative regime.

Published
1994
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11. Fusionlike processes in theN14+232Th reaction at 30 MeV/nucleon

Author

A.L. Boonstra, J. Wilczyński, K. Siwek-Wilczyńska, Z. Sosin, E.E. Koldenhof, Rudolf Siemssen, J.D. Hinnefeld, H. W. Wilschut, and H.K.W. Leegte

Subjects
Physics, Nuclear reaction, Coalescence (physics), Nuclear and High Energy Physics, Photon, Neutron emission, Fission, Momentum transfer, Atomic physics, Nuclear Experiment, Nucleon, Charged particle
Abstract

Fusionlike processes were studied in the {sup 14}N+{sup 232}Th reaction at 30 MeV per nucleon. Partition of the fusionlike cross section was determined by detecting nonequilibrium charged particles with an array of phoswich detectors (plastic wall) in coincidence with fission fragments for which the folding angle and thus the momentum transfer was measured. By measuring both single and multiple hits in the plastic wall and by correcting for its incomplete angular coverage a very extensive database of the fusionlike channels was obtained. The results were compared with model predictions comprising the BUU, Fermi jetting, the Boltzmann master equation model, and the nucleon-exchange transport model. It was found that these models which globally describe the dependence of the inclusive momentum transfer in fusionlike reactions cannot account for the associated particle production, in particular if the nucleons bound in the observed complex particles ({ital d},{ital t},{alpha}) are included in the comparison. Calculations of the energy spectra of the complex particles with the coalescence formalism indicate that a large fraction of the observed complex particles in the fusionlike reactions cannot be accounted for by pre-equilibrium emission from the fused composite system. They most probably originate from massive-transfer-type reactions that contribute to the beam-velocitymore » component in the energy spectra.« less

Published
1992
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12. A review on SHE research at GANIL

Author

Ch. Stodel, N. Amar, R. Anne, G. Auger, B. Bouriquet, J.-M. Casandjian, A. Chatillon, R. Cee, E. Clément, R. Dayras, O. Dorvaux, A. Drouart, G. de France, F. de Oliveira Santos, R. de Tourreil, S. Grévy, F. Hannachi, F. Hannappe, K. Hauschild, F. P. Hessberger, S. Hofmann, A. Korichi, R. Lichtenhäler, K. Lojek, A. Lopez-Martens, A. Péghaire, J. Péter, M.-G. Saint-Laurent, Z. Sosin, L. Stuttge, Ch. Theisen, A. C. C. Villari, J.-P. Wieleczko, A. Wieloch, 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), 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), Collège de France (CdF (institution)), 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), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Institut Pluridisciplinaire Hubert Curien (IPHC), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), Arnould M., Lewitowicz M., Emling H., Akimune H., Ohta M., Utsunomiya H., Wada T., Yamagata T., 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Collège de France (CDF), and Collège de France (CdF)

Subjects
Nuclear physics, Physics, Radioactive ion beams, superheavy nuclei, 010308 nuclear & particles physics, 0103 physical sciences, Systems engineering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, radioactive ion beams, 01 natural sciences, 27.90.+b, 29.25.Rm, Medium term
Abstract

International audience; This report summarizes the experiments relative to Super-Heavy Element studies done at GANIL — CEA — CNRS since 1999. It also gives an overview of future experiments and opportunities offered by SPIRAL 2 and LINAG beams in a medium term.

Published
2006
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13. Results from the BRAHMS experiment at RHIC

Author

Dieter Röhrich, I.G. Bearden, D. Beavis, C. Besliu, Y. Blyakhman, J. Brzychczyk, B. Budick, H. Bøggild, C. Chasman, C.H. Christensen, P. Christiansen, J. Cibor, R. Debbe, E. Enger, J.J. Gaardhøje, M. Germinario, K. Grotowski, K. Hagel, O. Hansen, A.K. Holme, H. Ito, E. Jakobsen, A. Jipa, J.I. Jordre, F. Jundt, C.E. Jørgensen, R. Karabowicz, T. Keutgen, E.J. Kim, T. Kozik, T.M. Larsen, J.H. Lee, Y.K. Lee, G. Løvhøiden, Z. Majka, A. Makeev, B. McBreen, M. Mikkelsen, M. Murray, J. Natowitz, B.S. Nielsen, J. Norris, K. Olchanski, D. Ouerdane, R. Planeta, F. Rami, D. Roehrich, B. Samset, D. Sandberg, S. Sanders, R.A. Sheetz, Z. Sosin, P. Staszel, T.S. Tveter, F. Videbaek, R. Wada, A. Wieloch, Z. Yin, and I.S. Zgura

Published
2003
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14. Rapidity dependence of antiproton-to-proton ratios in Au+Au collisions at square root of (sNN) = 130 GeV

Author

I G, Bearden, D, Beavis, C, Besliu, Y, Blyakhman, J, Brzychczyk, B, Budick, H, Bøggild, C, Chasman, C H, Christensen, P, Christiansen, J, Cibor, R, Debbe, J J, Gaardhøje, K, Grotowski, K, Hagel, O, Hansen, A, Holm, A K, Holme, H, Ito, E, Jakobsen, A, Jipa, J I, Jørdre, F, Jundt, C E, Jørgensen, T, Keutgen, E J, Kim, T, Kozik, T M, Larsen, J H, Lee, Y K, Lee, G L, Løvhøiden, Z, Majka, A, Makeev, B, McBreen, M, Murray, J, Natowitz, B S, Nielsen, K, Olchanski, J, Olness, D, Ouerdane, R, Planeta, F, Rami, D, Röhrich, B H, Samset, S J, Sanders, R A, Sheetz, Z, Sosin, P, Staszel, T F, Thorsteinsen, T S, Tveter, F, Videbaek, R, Wada, A, Wieloch, and I S, Zgura

Abstract

Measurements, with the BRAHMS detector, of the antiproton-to-proton ratio at midrapidities and forward rapidities, are presented for Au+Au reactions at square root of [s(NN)] = 130 GeV, and for three different collision centralities. For collisions in the 0%-40% centrality range, we find N(pmacr;)/N(p) = 0.64+/-0.04((stat))+/-0.06((syst)) at y approximately 0, 0.66+/-0.03+/-0.06 at y approximately 0.7, and 0.41+/-0.04+/-0.06 at y approximately 2. The ratios are found to be nearly independent of collision centrality and transverse momentum. The antiproton and proton rapidity densities vary differently with rapidity, and indicate a significant degree of collision transparency, although a net-baryon free midrapidity plateau (Bjorken limit) is not yet reached.

Published
2001

15. NA61/SHINE facility at the CERN SPS: beams and detector system

Author

N Abgrall, O Andreeva, A Aduszkiewicz, Y Ali, T Anticic, N Antoniou, B Baatar, F Bay, A Blondel, J Blumer, M Bogomilov, M Bogusz, A Bravar, J Brzychczyk, S A Bunyatov, P Christakoglou, M Cirkovic, T Czopowicz, N Davis, S Debieux, H Dembinski, F Diakonos, S Di Luise, W Dominik, T Drozhzhova, J Dumarchez, K Dynowski, R Engel, I Efthymiopoulos, A Ereditato, A Fabich, G A Feofilov, Z Fodor, A Fulop, M Gaździcki, M Golubeva, K Grebieszkow, A Grzeszczuk, F Guber, A Haesler, T Hasegawa, M Hierholzer, R Idczak, S Igolkin, A Ivashkin, D Jokovic, K Kadija, A Kapoyannis, E Kaptur, D Kielczewska, M Kirejczyk, J Kisiel, T Kiss, S Kleinfelder, T Kobayashi, V I Kolesnikov, D Kolev, V P Kondratiev, A Korzenev, P Koversarski, S Kowalski, A Krasnoperov, A Kurepin, D Larsen, A Laszlo, V V Lyubushkin, M Maćkowiak-Pawłowska, Z Majka, B Maksiak, A I Malakhov, D Maletic, D Manglunki, D Manic, A Marchionni, A Marcinek, V Marin, K Marton, H -J Mathes, T Matulewicz, V Matveev, G L Melkumov, M Messina, St Mrówczyński, S Murphy, T Nakadaira, M Nirkko, K Nishikawa, T Palczewski, G Palla, A D Panagiotou, T Paul, W Peryt, O Petukhov, C Pistillo, R Płaneta, J Pluta, B A Popov, M Posiadala, S Puławski, J Puzovic, W Rauch, M Ravonel, A Redij, R Renfordt, E Richter-Wa̧s, A Robert, D Röhrich, E Rondio, B Rossi, M Roth, A Rubbia, A Rustamov, M Rybczyński, A Sadovsky, K Sakashita, M Savic, K Schmidt, T Sekiguchi, P Seyboth, D Sgalaberna, M Shibata, R Sipos, E Skrzypczak, M Słodkowski, Z Sosin, P Staszel, G Stefanek, J Stepaniak, H Stroebele, T Susa, M Szuba, M Tada, V Tereshchenko, T Tolyhi, R Tsenov, L Turko, R Ulrich, M Unger, M Vassiliou, D Veberic, V V Vechernin, G Vesztergombi, L Vinogradov, A Wilczek, Z Włodarczyk, A Wojtaszek-Szwarz, O Wyszyński, L Zambelli, and W Zipper

Subjects
Physics - Instrumentation and Detectors, 530 Physics, Physics::Instrumentation and Detectors, Nuclear Theory, FOS: Physical sciences, weak-beam diagnostics, 01 natural sciences, trigger detectors, Nuclear physics, particle identification methods, time projection chambers, instrumentation for radioactive beams, Trigger detectors, 0103 physical sciences, Instrumentation for radioactive beams (fragmentation devices, fragment and isotope, separators incl. ISOL, Nuclear Experiment (nucl-ex), Detectors and Experimental Techniques, 010306 general physics, Nuclear Experiment, Instrumentation, Mathematical Physics, NA49 experiment, Physics, isobar separators, Large Hadron Collider, 010308 nuclear & particles physics, radioactive-beam ion sources, Detector, Instrumentation and Detectors (physics.ins-det), Super Proton Synchrotron, 81V36, Proton (rocket family), Beamline, ion and atom traps, Physics::Accelerator Physics, Heavy ion, High Energy Physics::Experiment, Neutrino
Abstract

NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose experimental facility to study hadron production in hadron-proton, hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton Synchrotron. It recorded the first physics data with hadron beams in 2009 and with ion beams (secondary 7Be beams) in 2011. NA61/SHINE has greatly profited from the long development of the CERN proton and ion sources and the accelerator chain as well as the H2 beamline of the CERN North Area. The latter has recently been modified to also serve as a fragment separator as needed to produce the Be beams for NA61/SHINE. Numerous components of the NA61/SHINE set-up were inherited from its predecessors, in particular, the last one, the NA49 experiment. Important new detectors and upgrades of the legacy equipment were introduced by the NA61/SHINE Collaboration. This paper describes the state of the NA61/SHINE facility - the beams and the detector system - before the CERN Long Shutdown I, which started in March 2013. NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose experimental facility to study hadron production in hadron-proton, hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton Synchrotron. It recorded the first physics data with hadron beams in 2009 and with ion beams (secondary 7Be beams) in 2011. NA61/SHINE has greatly profited from the long development of the CERN proton and ion sources and the accelerator chain as well as the H2 beamline of the CERN North Area. The latter has recently been modified to also serve as a fragment separator as needed to produce the Be beams for NA61/SHINE. Numerous components of the NA61/SHINE set-up were inherited from its predecessors, in particular, the last one, the NA49 experiment. Important new detectors and upgrades of the legacy equipment were introduced by the NA61/SHINE Collaboration. This paper describes the state of the NA61/SHINE facility - the beams and the detector system - before the CERN Long Shutdown I, which started in March 2013.

Published
2014
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16. Range sensitive telescope detector

Author

S. Micek, K. Grotowski, Z. Sosin, and T. Kozik

Subjects
Physics, Telescope, Range (particle radiation), Electrical resistivity and conductivity, law, Ionization, Detector, General Engineering, Atomic physics, Energy (signal processing), Ion, Anode, law.invention
Abstract

A telescope for the identification of heavy ions over an extended energy range is described. The energy loss Δ E is measured with an ionisation chamber supplied with the range-sensitive charge collection system. The particle residual energy E can be measured with a solid state detector. Two modes of operation are available: a standard ΔEt − E identification, or a charge integration along the track with a continuous resistivity anode. By a proper formation of this resistivity, one can obtain an identification signal proportional to the Z value in a large range of incident energies.

Published
1984
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17. An explicit partition of the fusion-like cross section

Author

Z. Zhang, R.H. Siemssen, Z. Sosin, E.E. Koldenhof, J.D. Hinnefeld, H. W. Wilschut, and H.K.W. Leegte

Subjects
Novel technique, Physics, Nuclear and High Energy Physics, Fusion, Momentum transfer, Atomic physics, Spectral line
Abstract

The evaporation residue cross section for fusion-like reactions of 309 MeV 14N+159Tb has been decomposed into cross sections for complete fusion and a number of specific incomplete fusion channels using a novel technique involving light-particle-KX-ray coincidences. With this partition it is possible to successfully describe the incomplete momentum transfer observed in velocity spectra of evaporation residues from a very similar system.

Published
1989
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18. Reduction of charged particle energy spectra to zero target thickness

Author

Z Sosin

Subjects
Physics, Reduction (complexity), Nuclear and High Energy Physics, Spectrum (functional analysis), Zero (complex analysis), Atomic physics, Charged particle beam, Instrumentation, Charged particle, Energy (signal processing), Spectral line
Abstract

A recursive formula and a simple iteration procedure are presented for reduction of a measured charged particle spectrum to the shape it would have at zero target thickness.

Published
1988
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19. The FAZIA project in Europe: R&D phase

Author

Zbigniew Sosin, E. Vient, F. Gramegna, Paola Marini, F. Salomon, Mariano Vigilante, G. Ademard, Luca Morelli, Gabriele Pasquali, G. Pastore, A. Ordine, Giovanni Casini, L. Roscilli, M. Falorsi, M. F. Rivet, P. Edelbruck, Ismael Martel, R. Giordano, C. Pain, R. Bougault, H. Petrascu, A. Chbihi, G. Brulin, L. Lavergne, Alessandro Olmi, O. Lopez, M. Pârlog, R. Rocco, A.J. Kordyasz, N. Le Neindre, A. Wieloch, C. Spitaels, G. Spadaccini, L. Bardelli, B. Bougard, S. Energico, E. Vanzanella, J.D. Frankland, Krzysztof Korcyl, R. Alba, A. Meoli, E. Piasecki, E. Bonnet, R. Borcea, M. Boisjoli, J.A. Dueñas, L. Ciolacu, M. Kajetanowicz, J. Łukasik, M. Cruceru, A. Boiano, S. Serra, T. Twaróg, Marek Palka, Piotr Pawłowski, K. Ga̧sior, G. Tobia, F. Negoita, B. De Fazio, E. Scarlini, P. Kulig, Andrea Stefanini, I. Cruceru, C. Huss, E. Wanlin, M. Petcu, B. Borderie, A. Grzeszczuk, Y. Merrer, S. Carboni, Simone Valdré, P. Di Meo, Giacomo Poggi, V. Seredov, A. Vanzanella, W. Zipper, G. Tortone, C. Maiolino, D. Sierpowski, G. Pontoriere, P. Desrues, M. Degerlier, Domenico Santonocito, B. D’Aquino, M. Guerzoni, F. Cassese, E. Galichet, G. Passeggio, Giuseppe Vitiello, A. Anastasio, E. Legouée, M. Cinausero, Sandro Barlini, V. Masone, Maurizio Bini, H. Hamrita, Silvia Piantelli, E. Rauly, G. Paduano, D. Gruyer, E. Rosato, M. Bruno, Tomasz Kozik, S. Barbey, C. Cassese, Tommaso Marchi, R. Bougault, G. Poggi, S. Barlini, B. Borderie, G. Casini, A. Chbihi, N. Le Neindre, M. Pârlog, G. Pasquali, S. Piantelli, Z. Sosin, G. Ademard, R. Alba, A. Anastasio, S. Barbey, L. Bardelli, M. Bini, A. Boiano, M. Boisjoli, E. Bonnet, R. Borcea, B. Bougard, G. Brulin, M. Bruno, S. Carboni, C. Cassese, F. Cassese, M. Cinausero, L. Ciolacu, I. Cruceru, M. Cruceru, B. D’Aquino, B. Fazio, M. Degerlier, P. Desrue, P. Meo, J. A. Dueña, P. Edelbruck, S. Energico, M. Falorsi, J. D. Frankland, E. Galichet, K. Gasior, F. Gramegna, R. Giordano, D. Gruyer, A. Grzeszczuk, M. Guerzoni, H. Hamrita, C. Hu, M. Kajetanowicz, K. Korcyl, A. Kordyasz, T. Kozik, P. Kulig, L. Lavergne, E. Legouée, O. Lopez, J. Łukasik, C. Maiolino, T. Marchi, P. Marini, I. Martel, V. Masone, A. Meoli, Y. Merrer, L. Morelli, F. Negoita, A. Olmi, A. Ordine, G. Paduano, C. Pain, M. Pałka, G. Passeggio, G. Pastore, P. Pawłowski, M. Petcu, H. Petrascu, E. Piasecki, G. Pontoriere, E. Rauly, M. F. Rivet, R. Rocco, E. Rosato, L. Roscilli, E. Scarlini, F. Salomon, D. Santonocito, V. Seredov, S. Serra, D. Sierpowski, G. Spadaccini, C. Spitael, A. A. Stefanini, G. Tobia, G. Tortone, T. Twaróg, S. Valdré, A. Vanzanella, E. Vanzanella, E. Vient, M. Vigilante, G. Vitiello, E. Wanlin, A. Wieloch, W. Zipper, 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), 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), 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), Conservatoire National des Arts et Métiers [CNAM] (CNAM), FAZIA, R., Bougault, G., Poggi, S., Barlini, B., Borderie, G., Casini, A., Chbihi, N., Le Neindre, M., Pârlog, G., Pasquali, S., Piantelli, Z., Sosin, G., Ademard, R., Alba, A., Anastasio, S., Barbey, L., Bardelli, M., Bini, A., Boiano, M., Boisjoli, E., Bonnet, R., Borcea, B., Bougard, G., Brulin, M., Bruno, S., Carboni, C., Cassese, F., Cassese, M., Cinausero, L., Ciolacu, I., Cruceru, M., Cruceru, B., D’Aquino, DE FAZIO, Benedetto, M., Degerlier, P., Desrue, P., Di Meo, J. A., Dueña, P., Edelbruck, S., Energico, M., Falorsi, J. D., Frankland, E., Galichet, K., Gasior, F., Gramegna, Giordano, Raffaele, D., Gruyer, A., Grzeszczuk, M., Guerzoni, H., Hamrita, C., Hu, M., Kajetanowicz, K., Korcyl, A., Kordyasz, T., Kozik, P., Kulig, L., Lavergne, E., Legouée, O., Lopez, J., Lukasik, C., Maiolino, T., Marchi, P., Marini, I., Martel, V., Masone, A., Meoli, Y., Merrer, L., Morelli, F., Negoita, A., Olmi, A., Ordine, G., Paduano, C., Pain, M., Palka, G., Passeggio, P., Pawlowski, M., Petcu, H., Petrascu, E., Piasecki, G., Pontoriere, E., Rauly, M. F., Rivet, R., Rocco, Rosato, Elio, L., Roscilli, E., Scarlini, F., Salomon, D., Santonocito, V., Seredov, S., Serra, D., Sierpowski, Spadaccini, Giulio, C., Spitael, A. A., Stefanini, G., Tobia, G., Tortone, T., Twaróg, S., Valdré, A., Vanzanella, E., Vanzanella, E., Vient, Vigilante, Mariano, G., Vitiello, E., Wanlin, A., Wieloch, W., Zipper, Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), 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), and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)

Subjects
Physics, NUCLEAR REACTIONS, Nuclear and High Energy Physics, Silicon, SCINTILLATION DETECTORS, Physics::Instrumentation and Detectors, Nuclear engineering, Detector, SILICON DETECTORS, chemistry.chemical_element, Reaction products, Nanotechnology, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Particle detector, Particle identification, Semiconductor detector, chemistry, Scintillation counter, Hermetic detector, PARTICLE IDENTIFICATION
Abstract

The goal of the FAZIA Collaboration is the design of a new-generation 4π detector array for heavy-ion collisions with radioactive beams. This article summarizes the main results of the R&D phase, devoted to the search for significant improvements of the techniques for charge and mass identification of reaction products. This was obtained by means of a systematic study of the basic detection module, consisting of two transmission-mounted silicon detectors followed by a CsI(Tl) scintillator. Significant improvements in ΔE-E and pulse-shape techniques were obtained by controlling the doping homogeneity and the cutting angles of silicon and by putting severe constraints on thickness uniformity. Purposely designed digital electronics contributed to identification quality. The issue of possible degradation related to radiation damage of silicon was also addressed. The experimental activity was accompanied by studies on the physics governing signal evolution in silicon. The good identification quality obtained with the prototypes during the R&D phase, allowed us to investigate also some aspects of isospin physics, namely isospin transport and odd-even staggering. Now, after the conclusion of the R&D period, the FAZIA Collaboration has entered the demonstrator phase, with the aim of verifying the applicability of the devised solutions for the realization of a larger-scale experimental set-up.

Published
2014
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20. Low-temperature technique of thin silicon ion implanted epitaxial detectors

Author

Giovanni Casini, Simone Valdré, Gabriele Pasquali, M. Teodorczyk, A. Chbihi, N. Le Neindre, Zbigniew Sosin, Mariano Vigilante, J.D. Frankland, P. Kulig, E. Bonnet, M. Guerzoni, Maurizio Bini, E. Scarlini, E. Vanzanella, Dariusz Lipiński, Bernard Borderie, A. Grzeszczuk, Z. Khabanowa, P. Edelbruck, M. Cinausero, M. Parlog, G. Spadaccini, Ł. Kordyasz, Andrea Stefanini, Alessandro Olmi, R. Bougault, K. Ga̧sior, M. Gajewski, J. Sarnecki, A.J. Kordyasz, A. Boiano, R. Alba, M.F. Rivet, D. Gruyer, M. Bruno, T. Twaróg, A. Zagojski, A. Brzozowski, G. Pastore, A. Meoli, Luca Morelli, T. Marchi, M. Kowalczyk, A. Bednarek, D. Santonocito, C. Maiolino, A. Ordine, K. Krzyżak, S. Serra, Y. Merrer, K. J. Tarasiuk, E. Vient, F. Salomon, Giacomo Poggi, H. Wodzińska, F. Gramegna, G. Tortone, W. Zipper, O. Lopez, Silvia Piantelli, Elio Rosato, Tomasz Kozik, G. Ademard, Sandro Barlini, 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 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), Fazia Collaboration, A. J., Kordyasz, N., Le Neindre, M., Parlog, G., Casini, R., Bougault, G., Poggi, A., Bednarek, M., Kowalczyk, O., Lopez, Y., Merrer, E., Vient, J. D., Frankland, E., Bonnet, A., Chbihi, D., Gruyer, B., Borderie, G., Ademard, P., Edelbruck, M. F., Rivet, F., Salomon, M., Bini, S., Valdré, E., Scarlini, G., Pasquali, G., Pastore, S., Piantelli, A., Stefanini, A., Olmi, S., Barlini, A., Boiano, Rosato, Elio, A., Meoli, A., Ordine, Spadaccini, Giulio, G., Tortone, Vigilante, Mariano, E., Vanzanella, M., Bruno, S., Serra, L., Morelli, M., Guerzoni, R., Alba, D., Santonocito, C., Maiolino, M., Cinausero, F., Gramegna, T., Marchi, T., Kozik, P., Kulig, T., Twaróg, Z., Sosin, K., Ga??sior, A., Grzeszczuk, W., Zipper, J., Sarnecki, D., Lipi??ski, H., Wodzi??ska, A., Brzozowski, M., Teodorczyk, M., Gajewski, A., Zagojski, K., Krzy??ak, K. J., Tarasiuk, Z., Khabanowa, Kordyasz, ?. ?., 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), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Silicon, 010308 nuclear & particles physics, Detector, Analytical chemistry, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Epitaxy, 01 natural sciences, Particle detector, Charged particle, Ion, Semiconductor detector, Ion implantation, chemistry, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Atomic physics, 010306 general physics
Abstract

A new technique of large-area thin ion implanted silicon detectors has been developed within the R&D performed by the FAZIA Collaboration. The essence of the technique is the application of a low-temperature baking process instead of high-temperature annealing. This thermal treatment is performed after B+ ion implantation and Al evaporation of detector contacts, made by using a single adjusted Al mask. Extremely thin silicon pads can be therefore obtained. The thickness distribution along the X and Y directions was measured for a prototype chip by the energy loss of α-particles from 241Am (〈E α 〉 = 5.5 MeV). Preliminary tests on the first thin detector (area ≈ 20 × 20 mm2) were performed at the INFN-LNS cyclotron in Catania (Italy) using products emitted in the heavy-ion reaction 84Kr (E = 35 A MeV) + 112Sn. The ΔE − E ion identification plot was obtained using a telescope consisting of our thin ΔE detector (21 μm thick) followed by a typical FAZIA 510 μm E detector of the same active area. The charge distribution of measured ions is presented together with a quantitative evaluation of the quality of the Z resolution. The threshold is lower than 2 A MeV depending on the ion charge.

Published
2015
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21. The ASY-EOS experiment at GSI: Investigating the symmetry energy at supra-saturation densities

Author

Lunardi, S., Russotto, P., Chartier, M., Cozma, M. D., De Filippo, E., Le Fèvre, A., Gannon, S., Gašparić, I., Kiš, M., Kupny, S., Leifels, Y., Lemmon, R. C., Li, Q., Łukasik, J., Marini, P., Pawłowski, P., Santoro, S., Trautmann, W., Veselsky, M., Acosta, L., Adamczyk, M., Al Ajlan, A., Al Garawi, M., Al Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Baran, V., Basrak, Z., Bassini, R., Benlliure, J., Boiano, C., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Cardella, G., Cammarata, P., Chajecki, Z., Chbihi, A., Colonna, M., Czech, B., Di Toro, M., Famiano, M., Greco, V., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, Riccardo, Isobe, T., Kezzar, K., Krasznahorkay, A., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Lombardo, I., Lynch, W. G., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Papa, M., Pirrone, S., Pleskac, R., Politi, G., Porto, F., Reifarth, R., Reisdorf, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trifirò, A., Trimarchi, M., Tsang, M. B., Verde, G., Vigilante, M., Wieloch, A., Wigg, P., Wolter, H. H., Wu, P., Yennello, S., Zambon, P., Zetta, L., Zoric, M., Bizzeti, P. G., Bucci, C., Chiari, M., Dainese, A., Di Nezza, P., Menegazzo, R., Nannini, A., Signorini, C., Valiente Dobon, J. J., Grand Accélérateur National d'Ions Lourds (GANIL), 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), Russotto, P., Chartier, M., Filippo, E., Fèvre, A., Gannon, S., Gaparić, I., Ki, M., Kupny, S., Leifels, Y., Lemmon, R., Ukasik, J., Marini, P., Pagano, A., Pawowski, P., Santoro, S, Trautmann, W., Veselsky, M., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Baran, V., Basrak, Z., Benlliure, J., Boiano, C., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Cardella, G., Cammarata, P., Chajecki, Z., Chbihi, A., Colonna, M., Cozma, D., Czech, B., Toro, M., Famiano, M., Geraci, E., Greco, V., Grassi, L., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Krasznahorkay, A., Kurz, N., Guidara, E., Lanzalone, G., Lasko, P., Li, Q., Lombardo, I., Lynch, W., Matthews, Z., May, L., Minniti, T., Mostazo, M., Papa, M., Pirrone, S., Politi, G., Porto, F., Reifarth, R., Reisdorf, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Simon, H., Skwirczynska, I., Sosin, Z., Stuhl, L., Trifirò, A., Trimarchi, M., Tsang, M., Verde, G., Vigilante, M., Wieloch, A., Wigg, P., Wolter, H., Wu, P., Yennello, S., Zambon, P., Zetta, L., Zoric, M., B.A.Li and J.B.Natowitz, P., Russotto, M., Chartier, E., De Filippo, A., Le Fevre, S., Gannon, A., Ga??spari??, M., Ki??, S., Kupny, Y., Leifel, R., Lemmon, J., Lukasik, P., Marini, A., Pagano, P., Pawlowski, S., Santoro, W., Trautmann, M., Veselsky, L., Acosta, M., Adamczyk, A., Al Ajlan, M., Al Garawi, S., Al Homaidhi, F., Amorini, L., Auditore, T., Aumann, Y., Ayyad, V., Baran, Z., Basrak, J., Benlliure, C., Boiano, C., Boisjoli, K., Boretzky, J., Brzychczyk, A., Budzanowski, G., Cardella, P., Cammarata, Z., Chajecki, A., Chbihi, M., Colonna, B., Czech, M., Di Toro, M., Famiano, E., Geraci, L., Grassi, V., Greco, C., Guazzoni, P., Guazzoni, M., Heil, L., Heilborn, R., Introzzi, T., Isobe, K., Kezzar, A., Krasznahorskay, N., Kurz, E., La Guidara, G., Lanzalone, P., Lasko, Q., Li, I., Lombardo, W. G., Lynch, Z., Matthew, L., May, T., Minniti, M., Mostazo, M., Papa, S., Pirrone, G., Politi, F., Porto, R., Reifarth, W., Reisdorf, F., Riccio, F., Rizzo, Rosato, Elio, D., Rossi, H., Simon, I., Skwirczynska, Z., Sosin, A., Trifirò, M., Trimarchi, M. B., Tsang, G., Verde, Vigilante, Mariano, A., Wieloch, P., Wigg, H. H., Wolter, P., Wu, S., Yennello, P., Zambon, L., Zetta, M., Zoric, Cozma, M., De Filippo, E., Le Fèvre, A., Gašparić, I., Kiš, M., Łukasik, J., Pawłowski, P., Santoro, S., Bassini, R., Di Toro, M., La Guidara, E., and Pleskac, R.

Subjects
Particle physics, History, QC1-999, Nuclear Theory, FOS: Physical sciences, and isobaric spin 24.10.Pa Thermal and statistical models, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Education, Nuclear physics, Physics and Astronomy (all), nuclear physics, heavy-ions, symmetry energy, Au+Au collisions, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, ComputingMilieux_MISCELLANEOUS, Physics, sezele, Order (ring theory), Nuclear equation of state, Observable, 21.65.-f Nuclear matter 27.80.+w 190(less-than-or-equal-to)A(less-than-or-equal-to)219 24.60.-k Statistical theory and fluctuations 25.75.Gz Particle correlations and fluctuations 21.10.Hw Spin, Symmetry (physics), Term (time), Computer Science Applications, parity, Nuclear reactions, Saturation (chemistry), Nucleon, Energy (signal processing)
Abstract

The elliptic-flow ratio of neutrons with respect to protons in reactions of neutron rich heavy-ions systems at intermediate energies has been proposed as an observable sensitive to the strength of the symmetry term in the nuclear Equation Of State (EOS) at supra-saturation densities. The recent results obtained from the existing FOPI/LAND data for $^{197}$Au+$^{197}$Au collisions at 400 MeV/nucleon in comparison with the UrQMD model allowed a first estimate of the symmetry term of the EOS but suffer from a considerable statistical uncertainty. In order to obtain an improved data set for Au+Au collisions and to extend the study to other systems, a new experiment was carried out at the GSI laboratory by the ASY-EOS collaboration in May 2011., Comment: Talk given by P. Russotto at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)

Published
2013
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22. ASY-EOS experiment at GSI

Author

S. Pirrone, Riccardo Introzzi, D. Loria, J. Brzychczyk, F. Amorini, Chiara Guazzoni, Marielle Chartier, Triestino Minniti, M. Trimarchi, A. Budzanowski, H. H. Wolter, L. W. May, M. Di Toro, M. Al-Garawi, M. Zoric, B. Tsang, B. Czech, L. Grassi, Z. Chajecki, E. La Guidara, C. Boisjoli, P. Z. Wu, Matthias Heil, Rene Reifarth, G. Politi, Yassid Ayyad, Martin Veselsky, K. Boretzky, Paola Marini, G. Cardella, F. Porto, P. Guazzoni, F. Riccio, Michael Famiano, J. Lukasik, Maria Colonna, Vincenzo Greco, Yvonne Leifels, A. Gašsparić, A. Trifirò, E. Geraci, I. Skwirczyńska, W. Reisdorf, L. Acosta, P. Zambon, A. Le Fèvre, Lauren Heilborn, Michele Papa, M. Adamczyk, Lucrezia Auditore, P. Cammarata, Thomas Aumann, Mihai Petrovici, Z. Basrak, A. Chbihi, Ivano Lombardo, Piotr Pawłowski, S. Cavallaro, Z. Matthews, M. Mostazo, P. Russotto, J. Wilczyński, S. Santoro, P. Lasko, Tadaaki Isobe, F. Rizzo, V. Baran, D. M. Rossi, Zbigniew Sosin, Qingfeng Li, Mariano Vigilante, W. Trautmann, G. Lanzalone, W. G. Lynch, M. Kiš, J. Benlliure, Elio Rosato, S. Al-Homaidhi, C. Boiano, A. Wieloch, Angelo Pagano, E. De Filippo, Abdulrahman Alajlan, Roy Crawford Lemmon, S. Kupny, Sherry Yennello, N. Kurz, L. Zetta, Herbert A. Simon, P. Wigg, K. Kezzar, Giuseppe Verde, Grand Accélérateur National d'Ions Lourds (GANIL), 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), J.D Frankland, A. Pagano, S. Pirrone, M.-F Rivet, F. Rizzo, J.D.Frankland, A.Pagano, S.Pirrone, m.F.Rivet, F.Rizzo, P., Russotto, L., Acosta, M., Adamczyk, A., Al Ajlan, M., Al Garawi, S., Al Homaidhi, F., Amorini, L., Auditore, T., Aumann, Y., Ayyad, V., Baran, Z., Basrak, J., Benlliure, C., Boiano, C., Boisjoli, K., Boretzky, J., Brzychczyk, A., Budzanowski, G., Cardella, P., Cammarata, S., Cavallaro, Z., Chajecki, M., Chartier, A., Chbihi, M., Colonna, B., Czech, E., De Filippo, M., Di Toro, M., Famiano, A., Le Fevre, A., Ga??spari??, E., Geraci, L., Grassi, V., Greco, C., Guazzoni, P., Guazzoni, M., Heil, L., Heilborn, R., Introzzi, T., Isobe, K., Kezzar, M., Ki??, S., Kupny, N., Kurz, E., La Guidara, G., Lanzalone, P., Lasko, Y., Leifel, R., Lemmon, Q., Li, Lombardo, Ivano, D., Loria, J., Lukasik, W. G., Lynch, P., Marini, Z., Matthew, L., May, T., Minniti, M., Mostazo, A., Pagano, M., Papa, P., Pawlowski, M., Petrovici, S., Pirrone, G., Politi, F., Porto, R., Reifarth, W., Reisdorf, F., Riccio, F., Rizzo, Rosato, Elio, D., Rossi, S., Santoro, H., Simon, I., Skwirczynska, Z., Sosin, W., Trautmann, A., Trifirò, M., Trimarchi, B., Tsang, M., Veselsky, G., Verde, Vigilante, Mariano, A., Wieloch, P., Wigg, J., Wilczynski, H. H., Wolter, P., Wu, S., Yennello, P., Zambon, L., Zetta, M., Zoric, Russotto, P., Acosta, L., Adamczyk, M., Al-Ajlan, A., Al-Garawi, M., Al-Homaidhi, S., Amorini, F., Auditore, L., Aumann, T., Ayyad, Y., Baran, V., Basrak, Z., Benlliure, J., Boiano, C., Boisjoli, M., Boretzky, K., Brzychczyk, J., Budzanowski, A., Cardella, G., Cammarata, P., Cavallaro, S., Chajecki, Z., Chartier, M., Chbihi, A., Colonna, M., Czech, B., De Filippo, E., Di Toro, M., Famiano, M., Le Fevre, A., Gašparić, I., Geraci, E., Grassi, L., Greco, V., Guazzoni, C., Guazzoni, P., Heil, M., Heilborn, L., Introzzi, R., Isobe, T., Kezzar, K., Kiš, M., Kupny, S., Kurz, N., La Guidara, E., Lanzalone, G., Lasko, P., Leifels, Y., Lemmon, R., Li, Q., Lombardo, I., Loria, D., Lukasik, J., Lynch, W., Marini, P., Matthews, Z., May, L., Minniti, T., Mostazo, M., Pagano, A., Papa, M., Pawlowski, P., Petrovici, M., Pirrone, S., Politi, G., Porto, F., Reifarth, R., Reisdorf, W., Riccio, F., Rizzo, F., Rosato, E., Rossi, D., Santoro, S., Simon, H., Skwirczynska, I., Sosin, Z., Trautmann, W., Trifirò, A., Trimarchi, M., Tsang, B., Veselsky, M., Verde, G., Vigilante, M., Wieloch, A., Wigg, P., Wilczynski, J., Wolter, H., Wu, P., Yennello, S., Zambon, P., Zetta, L., and Zoric, M.

Subjects
Physics, sezele, QC1-999, Nuclear Theory, symmetry energy, Observable, Nuclear equation of state, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nuclear equation of state, Symmetry (physics), Term (time), Nuclear physics, Physics and Astronomy (all), nucleus-nucleus collisions, Neutron, Nucleon, Nuclear Experiment
Abstract

The elliptic-flow ratio of neutrons with respect to protons in reactions of neutron rich Heavy-Ion at intermediate energies has been recently proposed as an observable sensitive to the strength of the symmetry term in the nuclear equation of state (EOS) at supra-saturation densities. The recent results obtained from the existing FOPI/LAND data for 197Au+197Au collisions at 400 MeV/nucleon in comparison with the UrQMD model allowed a first estimate of the symmetry term of the EOS but suffer from a considerable statistical uncertainty. In order to obtain an improved data set for Au+Au collisions and to extend the study to other systems, a new experiment was carried out at the GSI laboratory by the ASY-EOS collaboration in May 2011. © Owned by the authors, 2012.

Published
2012
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23. Rapidity dependence of antiproton-to-proton ratios in Au+Au collisions at square root of (sNN) = 130 GeV.

Author

Bearden IG, Beavis D, Besliu C, Blyakhman Y, Brzychczyk J, Budick B, Bøggild H, Chasman C, Christensen CH, Christiansen P, Cibor J, Debbe R, Gaardhøje JJ, Grotowski K, Hagel K, Hansen O, Holm A, Holme AK, Ito H, Jakobsen E, Jipa A, Jørdre JI, Jundt F, Jørgensen CE, Keutgen T, Kim EJ, Kozik T, Larsen TM, Lee JH, Lee YK, Løvhøiden GL, Majka Z, Makeev A, McBreen B, Murray M, Natowitz J, Nielsen BS, Olchanski K, Olness J, Ouerdane D, Planeta R, Rami F, Röhrich D, Samset BH, Sanders SJ, Sheetz RA, Sosin Z, Staszel P, Thorsteinsen TF, Tveter TS, Videbaek F, Wada R, Wieloch A, and Zgura IS

Abstract

Measurements, with the BRAHMS detector, of the antiproton-to-proton ratio at midrapidities and forward rapidities, are presented for Au+Au reactions at square root of [s(NN)] = 130 GeV, and for three different collision centralities. For collisions in the 0%-40% centrality range, we find N(&pmacr;)/N(p) = 0.64+/-0.04((stat))+/-0.06((syst)) at y approximately 0, 0.66+/-0.03+/-0.06 at y approximately 0.7, and 0.41+/-0.04+/-0.06 at y approximately 2. The ratios are found to be nearly independent of collision centrality and transverse momentum. The antiproton and proton rapidity densities vary differently with rapidity, and indicate a significant degree of collision transparency, although a net-baryon free midrapidity plateau (Bjorken limit) is not yet reached.

Published
2001
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