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1. Particle production and flow at SIS Energies

Author

Herrmann, N., Hong, B., Ritman, J., Best, D., Gobbi, A., Hildenbrand, Kd, Leifels, Y., Pinkenburg, C., Reisdorf, W., Schull, D., Sodan, U., Wang, Gs, Wienold, T., Alard, Jp, Amouroux, V., Bastid, N., Belyaev, I., Berger, L., Biegansky, J., Buta, A., Caplar, R., Cindro, N., Coffin, Jp, Crochet, P., Dona, R., Dupieux, P., Dzelalija, M., Eskef, M., Fintz, P., Fodor, Z., Genouxlubain, A., Goebels, G., Guillaume, G., Hafele, E., Holbling, S., Jundt, F., Kecskemeti, J., Kirejczyk, N., Korchagin, Y., Roland Kotte, Kuhn, C., Lambrecht, D., Lebedev, A., Legrand, I., Maazouzi, C., Manko, V., Mosner, J., Mohren, S., Neubert, W., Pelte, D., Petrovici, M., Rami, F., Ramillien, V., Roy, C., Seres, Z., Sikora, B., Simion, V., Siwekwilczynska, K., Smolyankin, V., Tizniti, L., Trzaska, M., Vasiliev, Ma, Wagner, P., Wohlfarth, D., Zhilin, A., 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), FOPI, and Heyd, Yvette

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
1996

2. Central Au on Au collisions

Author

Gobbi, A., Alard, Jp, Amouroux, V., Basrak, Z., Bastid, N., Belayev, Im, Berger, L., Best, D., Biegansky, J., Bini, M., Boussange, S., Bock, R., Buta, A., Caplar, R., Cerruti, C., Cindro, N., Coffin, Jp, Dzelalija, M., Dona, R., Dupieux, P., Ero, J., Fintz, P., Fodor, Z., Fraysse, L., Goebels, G., Guillaume, G., Hafele, E., Herrmann, N., Hildenbrand, Kd, Holbling, S., Houari, A., Jundt, F., Kecskemeti, J., Kirejczyk, M., Korchagin, Y., Roland Kotte, Kowalczyk, M., Kramer, M., Kuhn, C., Lebedev, A., Legrand, I., Leifels, Y., Manko, V., Maurenzig, P., Mgebrishvili, G., Mohren, S., Mosner, J., Moisa, D., Montbel, I., Neuber, W., Olmi, A., Pasquali, G., Pelte, D., Petrovici, M., Pinkenburg, C., Poggi, G., Rami, F., Ramillien, V., Reisdorf, W., Ritman, Jl, Roy, C., Schull, D., Shen, Wq, Sikora, B., Simion, V., Siwekwilczynska, K., Smolyankin, S., Sodan, U., Taccetti, N., Trzaska, M., Vasiliev, Ma, Wagner, P., Wang, G., Wienold, T., Wohlfarth, D., Yatsounenko, Y., Zhilin, Av, 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

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1994

4. Nuclear stopping from 0.09A to 1.93A GeV and its correlation to flow.

Author

Reisdorf W, Andronic A, Gobbi A, Hartmann ON, Herrmann N, Hildenbrand KD, Kim YJ, Kirejczyk M, Koczoń P, Kress T, Leifels Y, Schüttauf A, Tymiński Z, Xiao ZG, Alard JP, Barret V, Basrak Z, Bastid N, Benabderrahmane ML, Caplar R, Crochet P, Dupieux P, Dzelalija M, Fodor Z, Grishkin Y, Hong B, Kecskemeti J, Korolija M, Kotte R, Lebedev A, Lopez X, Merschmeyer M, Mösner J, Neubert W, Pelte D, Petrovici M, Rami F, de Schauenburg B, Seres Z, Sikora B, Sim KS, Simion V, Siwek-Wilczyńska K, Smolyankin V, Stockmeier M, Stoicea G, Wagner P, Wiśniewski K, Wohlfarth D, Yushmanov I, and Zhilin A

Abstract

We present a complete systematics (excitation functions and system-size dependences) of global stopping and side flow for heavy ion reactions in the energy range between 0.09A and 1.93A GeV. For the heaviest system, Au+Au, we observe a plateau of maximal stopping extending from about 0.2A to 0.8A GeV with a fast drop on both sides. The degree of stopping, which is shown to remain significantly below the expectations of a full stopping scenario, is found to be highly correlated to the amount of side flow.

Published
2004
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5. Azimuthal dependence of collective expansion for symmetric heavy-ion collisions.

Author

Stoicea G, Petrovici M, Andronic A, Herrmann N, Alard JP, Basrak Z, Barret V, Bastid N, Caplar R, Crochet P, Dupieux P, Dzelalija M, Fodor Z, Hartmann O, Hildenbrand KD, Hong B, Kecskemeti J, Kim YJ, Kirejczyk M, Korolija M, Kotte R, Kress T, Lebedev A, Leifels Y, Lopez X, Merschmeier M, Neubert W, Pelte D, Rami F, Reisdorf W, Schüll D, Seres Z, Sikora B, Sim KS, Simion V, Siwek-Wilczyńska K, Smolyankin V, Stockmeier M, Wiśniewski K, Wohlfarth D, Yushmanov I, Zhilin A, and Danielewicz P

Abstract

Detailed studies of the azimuthal dependence of the mean fragment and flow energies in the Au+Au and Xe+CsI systems are reported as a function of incident energy and centrality. Comparisons between data and model calculations show that the flow energy values along different azimuthal directions could be viewed as snapshots of the fireball expansion with different exposure times. For the same number of participating nucleons more transversally elongated participant shapes from the heavier system produce less collective transverse energy. Good agreement with Boltzmann-Uehling-Uhlenbeck calculations is obtained for a soft nuclear equation of state.

Published
2004
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6. Simulation of neutron interactions at the single-cell level.

Author

Alard JP, Bodez V, Tchirkov A, Nénot ML, Arnold J, Crespin S, Rapp M, Verrelle P, and Dionet C

Subjects
Cell Death radiation effects, Dose-Response Relationship, Radiation, Humans, Melanoma pathology, Protons, Radiation Dosage, Time Factors, Tumor Cells, Cultured, Cell Nucleus radiation effects, Models, Biological, Neutrons adverse effects
Abstract

We recently reported that the exposure of cancer cells to 14 MeV neutrons at a very low dose rate (0.8 mGy min(-1)) produced a marked increase in cell killing at 5 cGy, followed by a plateau in survival and chromosomal damage. Simulation of the energy deposition events in irradiated cells may help to explain these unusual cell responses. We describe here a Monte Carlo simulation code, Energy Deposition in Cells Irradiated by Neutrons (EDCIN). The procedure considered the experimental setup and a hemispheric cell model. The simulation data fitted the dosimetric measurements performed using tissue-equivalent ionization chambers, Geiger-Müller counters, fission chambers, and silicon diodes. The simulation showed that 80% of the energy deposited in a single cell came from the interactions of neutrons outside the cell and only 20% came from neutron interactions inside the cell. Thus the "external" interactions that result in the production of recoil protons and secondary electrons may induce most of the biological damage, which may be repaired efficiently at low dose rate. The repair process may be triggered from a threshold level of damage, which would explain an initial increase cell death due to unrepaired sublethal damage, and then may compensate for induced damage, resulting in the plateaus.

Published
2002
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7. Simulation code for the interaction of 14 MeV neutrons on cells.

Author

Nénot ML, Alard JP, Dionet C, Arnold J, Tchirkov A, Meunier H, Bodez V, Rapp M, and Verrelle P

Subjects
Computer Simulation, Dose-Response Relationship, Radiation, Humans, Melanoma, Radiometry methods, Scattering, Radiation, Tumor Cells, Cultured, Cell Survival radiation effects, Neutrons
Abstract

The structure of the survival curve of melanoma cells irradiated by 14 MeV neutrons displays unusual features at very low dose rate where a marked increase in cell killings at 0.05 Gy is followed by a plateau for survival from 0.1 to 0.32 Gy. In parallel a simulation code was constructed for the interaction of 14 MeV neutrons with cellular cultures. The code describes the interaction of the neutrons with the atomic nuclei of the cellular medium and of the external medium (flask culture and culture medium), and is used to compute the deposited energy into the cell volume. It was found that the large energy transfer events associated with heavy charged recoils can occur and that a large part of the energy deposition events are due to recoil protons emitted from the external medium. It is suggested that such events could partially explain the experimental results.

Published
2002
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8. Effects of low-dose neutrons applied at reduced dose rate on human melanoma cells.

Author

Dionet C, Tchirkov A, Alard JP, Arnold J, Dhermain J, Rapp M, Bodez V, Tamain JC, Monbel I, Malet P, Kwiatkowski F, Donnarieix D, Veyre A, and Verrelle P

Subjects
Cell Survival radiation effects, DNA Damage, DNA, Neoplasm radiation effects, Dose-Response Relationship, Radiation, Humans, Radiation Tolerance, Relative Biological Effectiveness, Tumor Cells, Cultured pathology, Tumor Cells, Cultured radiation effects, Chromosome Aberrations, Chromosomes, Human radiation effects, Melanoma pathology, Neutrons
Abstract

Human melanoma cells that are resistant to gamma rays were irradiated with 14 MeV neutrons given at low doses ranging from 5 cGy to 1.12 Gy at a very low dose rate of 0.8 mGy min(-1) or a moderate dose rate of 40 mGy min(-1). The biological effects of neutrons were studied by two different methods: a cell survival assay after a 14-day incubation and an analysis of chromosomal aberrations in metaphases collected 20 h after irradiation. Unusual features of the survival curve at very low dose rate were a marked increase in cell killing at 5 cGy followed by a plateau for survival from 10 to 32.5 cGy. The levels of induced chromosomal aberrations showed a similar increase for both dose rates at 7.5 cGy and the existence of a plateau at the very low dose rate from 15 to 30 cGy. The existence of a plateau suggests that a repair process after low-dose neutrons might be induced after a threshold dose of 5-7.5 cGy which compensates for induced damage from doses as high as 32.5 cGy. These findings may be of interest for understanding the relative biological effectiveness of neutrons and the effects of environmental low-dose irradiation.

Published
2000
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9. Isospin tracing: A probe of nonequilibrium in central heavy-Ion collisions

Author

Rami F, Leifels Y, de Schauenburg B, Gobbi A, Hong B, Alard JP, Andronic A, Averbeck R, Barret V V, Basrak Z, Bastid N, Belyaev I I, Bendarag A, Berek G, Caplar R, Cindro N, Crochet P, Devismes A, Dupieux P, Dzelalija M, Eskef M, Finck C, Fodor Z, Folger H, Fraysse L, and Genoux-Lubain A

Abstract

Four different combinations of 9644Ru and 9640Zr nuclei, both as projectile and target, were investigated at the same bombarding energy of 400A MeV using a 4pi detector. The degree of isospin mixing between projectile and target nucleons is mapped across a large portion of the phase space using two different isospin-tracer observables, the number of measured protons and the tritium to 3He yield ratio. The experimental results show that the global equilibrium is not reached even in the most central collisions. Quantitative measures of stopping and mixing are extracted from the data. They are found to exhibit a quite strong sensitivity to the in-medium ( n,n) cross section used in microscopic transport calculations.

Published
2000
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10. Entropy in central Au+Au reactions between 100 and 400A MeV.

Author

Dzelalija M, Cindro N, Basrak Z, Caplar R, Hölbling S, Bini M, Maurenzig PR, Olmi A, Pasquali G, Poggi G, Taccetti N, Cerruti C, Coffin JP, Don R, Fintz P, Guillaume G, Houari A, Jundt F, Kuhn C, Rami F, Tezkratt R, Wagner P, Biegansky J, Kotte R, Mösner J, Neubert W, Wohlfarth D, Alard JP, Amouroux V V, Bastid N, Berger L, Belayev IM, Boussange S, Buta A, Dupieux P, Erö J, Fodor Z, Fraysse L, Gobbi A, Herrmann N, Hildenbrand KD, Ibnouzahir M, Kecskemeti J, Koncz P, Korchagin Y, Krämer M, Lebedev A, Legrand I I, Manko V V, Mgebrishvili G, Moisa D, Montarou G, Montbel I I, Pelte D, Petrovici M, Pras P, Ramillien V V, Reisdorf W, Schüll D, Seres Z, Sikora B, Simion V V, Smolyankin S, and Sodan U

Published
1995
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11. Cluster formation during expansion of hot and compressed nuclear matter produced in central collisions of Au on Au at 250A MeV.

Author

Petrovici M, Herrmann N, Legrand I I, Gobbi A, Hildenbrand KD, Reisdorf W, Buta A, Freifelder R, Jeong SC, Krämer M, Moisa D, Schüll D, Simion V V, Sodan U, Teh K, Wessels JP, Wienold T, Alard JP, Amouroux V V, Basrak Z, Bastid N, Belyaev IM, Berger L, Blaich T, Boussange S, Caplar R, Cerruti C, Cindro N, Coffin JP, Donà R, Dupieux P, Erö J, Fintz P, Fodor Z, Fraysse L, Guillaume G, Hölbling S, Houari A, Jundt F, Kecskemeti J, Koncz P, Korchagin Y, Kotte R, Kuhn C, Ibnouzahir M, Lebedev A, Maguire C, Manko V V, Mösner J, Montarou G, Montbel I I, Morel P, Neubert W, Pelte D, Rami F, Ramillien V V, Sadchikov A, Seres Z, Sikora B, Smolyankin S, Tezkratt R, Trzaska M, Vasiliev MA, and Wagner P

Published
1995
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12. Interplay of collective flow phenomena and velocity correlations of intermediate-mass fragments in collisions of Au+Au at E=(100-400)A MeV.

Author

Kotte R, Kämpfer B, Mösner J, Neubert W, Wohlfarth D, Alard JP, Amouroux V V, Basrak Z, Bastid N, Belayev IM, Berger L, Blaich T, Boussange S, Buta A, Caplar R, Cerruti C, Cindro N, Coffin JP, Don R, Dupieux P, Erö J, Fan ZG, Fintz P, Fodor Z, Fraysse L, Freifelder R, Frolov S, Gobbi A, Grigorian Y, Guillaume G, Herrmann N, Hildenbrand KD, Hölbling S, Houari O, Ibnouzahir M, Jeong SC, Jundt F, Kecskemeti J, Koncz P, Korchagin Y, Krämer M, Kuhn C, Legrand I I, Lebedev A, Manko V V, Matulewicz T, Mgebrishvili G, Moisa D, Montarou G, Montbel I I, Pelte D, Petrovici M, Pras P, Rami F, Ramillien V V, Reisdorf W, Sadchikov A, Schüll D, Seres Z, Sikora B, Simion V V, Smolyankin S, Sodan U, and Teh K

Published
1995
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13. Collective motion in selected central collisions of Au on Au at 150A MeV.

Author

Jeong SC, Herrmann N, Fan ZG, Freifelder R, Gobbi A, Hildenbrand KD, Krämer M, Randrup J, Reisdorf W, Schüll D, Sodan U, Teh K, Wessels JP, Pelte D, Trzaska M, Wienold T, Alard JP, Amouroux V V, Basrak Z, Bastid N, Belayev IM, Berger L, Bini M, Blaich T, Boussange S, Buta A, Caplar R, Cerruti C, Cindro N, Coffin JP, Dona R, Dupieux P, Erö J, Fintz P, Fodor Z, Fraysse L, Frolov S, Grigorian Y, Guillaume G, Hölbling S, Houari A, Jundt F, Kecskemeti J, Koncz P, Korchagin Y, Kotte R, Kuhn C, Ibnouzahir M, Legrand I I, Lebedev A, Maguire C, Manko V V, Maurenzig P, Mgebrishvili G, Mösner J, Moisa D, Montarou G, Montbel I I, Morel P, Neubert W, Olmi A, Pasquali G, Petrovici M, and Poggi G

Published
1994
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14. Entropy production in the Au+Au reaction between 150A and 800A MeV.

Author

Kuhn C, Konopka J, Coffin JP, Cerruti C, Fintz P, Guillaume G, Houari A, Jundt F, Maguire CF, Rami F, Tezkratt R, Wagner P, Basrak Z, Caplar R, Cindro N, Hölbling S, Alard JP, Bastid N, Berger L, Boussange S, Belayev IM, Blaich T, Buta A, Don R, Dupieux P, Erö J, Fan ZG, Fodor Z, Freifelder R, Fraysse L, Frolov S, Gobbi A, Grigorian Y, Herrmann N, Hildenbrand KD, Jeong SC, Jorio M, Kecskemeti J, Koncz P, Korchagin Y, Kotte R, Krämer M, Legrand I I, Lebedev A, Manko V V, Matulewicz T, Mgebrishvili G, Mösner J, Moisa D, Montarou G, Montbel I I, Neubert W, Pelte D, Petrovici M, Ramillien S, Reisdorf W, Sadchikov A, Schüll D, Seres Z, Sikora B, Simion V V, Smolyankin S, Sodan U, and Teh KM

Published
1993
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15. Velocity correlations of intermediate mass fragments produced in central collisions of Au+Au at E=150A MeV.

Author

Kämpfer B, Kotte R, Mösner J, Neubert W, Wohlfarth D, Alard JP, Basrak Z, Bastid N, Belayev IM, Blaich T, Buta A, Caplar R, Cerruti C, Cindro N, Coffin JP, Dupieux P, Erö J, Fan ZG, Fintz P, Fodor Z, Freifelder R, Fraysse L, Frolov S, Gobbi A, Grigorian Y, Guillaume G, Herrmann N, Hildenbrand KD, Hölbling S, Houari O, Jeong SC, Jorio M, Jundt F, Kecskemeti J, Koncz P, Korchagin Y, Krämer M, Kuhn C, Legrand I I, Lebedev A, Maguire C, Manko V V, Matulewicz T, Mgebrishvili G, Moisa D, Montaru G, Montbel I I, Morel P, Pelte D, Petrovici M, Rami F, Reisdorf W, Sadchikov A, Schüll D, Seres Z, Sikora B, Simion V V, Smolyankin S, Sodan U, Teh K, Tezkratt R, Trzaska M, Vasiliev MA, and Wagner P

Published
1993
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17. Midrapidity source of intermediate-mass fragments in highly central collisions of Au + Au at 150A MeV.

Author

Alard JP, Basrak Z, Bastid N, Belayev IM, Bini M, Blaich T, Bock R, Buta A, Caplar R, Cerruti C, Cindro N, Coffin JP, Crouau M, Dupieux P, Erö J, Fan ZG, Fintz P, Fodor Z, Freifelder R, Fraysse L, Frolov S, Gobbi A, Grigorian Y, Guillaume G, Herrmann N, Hildenbrand KD, Hölbling S, Houari O, Jeong SC, Jorio M, Jundt F, Kecskemeti J, Koncz P, Korchagin Y, Kotte R, Krämer M, Kuhn C, Legrand I I, Lebedev A, Maguire C, Manko V V, Matulewicz T, Mgebrishvili G, Mösner J, Moisa D, Montarou G, Morel P, Neubert W, Olmi A, Pasquali G, Pelte D, Petrovici M, Poggi G, Rami F, Reisdorf W, Sadchikov A, Schüll D, Seres Z, Sikora B, Simion V V, Smolyankin S, Sodan U, Taccetti N, and Teh K

Published
1992
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19. Charged-pion production in noninclusive proton-nucleus interactions at 0.8 and 1.6 GeV incident energies.

Author

Lemaire M, Trzaska M, Alard JP, Augerat J, Bachelier D, Bastid N, Boyard J, Cavata C, Charmensat P, Dupieux P, Gorodetzky P, Gosset J, Hennino T, Jourdain J, Le Merdy A, L'Hôte D, Lucas B, Marroncle J, Montarou G, Parizet M, Poitou J, Qassoud D, Radvanyi P, Ramstein B, Rahmani A, Roy-Stephan M, Valette O, Zupranski P, Cugnon J, and Vandermeulen J

Published
1991
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20. Exclusive measurements of light fragment production at forward angles in Ne-Pb and Ne-NaF collisions at E/A=400 MeV and 800 MeV.

Author

Bastid N, Alard JP, Arnold J, Augerat J, Babinet R, Biagi F, Brochard F, Crouau M, Charmensat P, and Dupieux P

Subjects
Ions, Lead chemistry, Mathematics, Models, Theoretical, Neon chemistry, Nuclear Physics, Protons, Sodium Fluoride chemistry, Temperature, Thermodynamics, Elementary Particles, Light
Abstract

Emission of light fragments at small angles is studied in relativistic heavy ion collisions using the Diogene plastic wall for both symmetrical and non-symmetrical target-projectile systems with 400 MeV per nucleon and 800 MeV per nucleon incident neon nuclei. Efficiency of multiplicity measurements in the small angle range for the selection of central or peripheral collisions is confirmed for asymmetric systems. Differential production cross sections of Z = 1 fragments show evidence for the existence of two emitting sources. The apparent temperature of each source is obtained from comparison with a thermodynamical model.

Published
1990
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21. The Diogene 4 pi detector at Saturne.

Author

Alard JP, Arnold J, Augerat J, Babinet R, Bastid N, Brochard F, Costilhes JP, Crouau M, De Marco N, Drouet M, Dupieux P, Fanet H, Fodor Z, Fraysse L, Girard J, Gorodetzky P, Gosset J, Laspalles C, Lemaire MC, L'Hôte D, Lucas B, Montarou G, Papineau A, Parizet MJ, and Schimmerling W

Subjects
Elementary Particles, Energy Transfer, Equipment Design, Ions, Models, Theoretical, Protons, Helium, Isotopes, Mesons, Nuclear Physics instrumentation, Radiometry instrumentation
Abstract

Diogene, an electronic 4 pi detector, has been built and installed at the Saturne synchrotron in Saclay. The forward angular range (0 degree-6 degrees) is covered by 48 time-of-flight scintillator telescopes that provide charge identification. The trajectories of fragments emitted at larger angles are recorded in a cylindrical 0.4-m3 Pictorial Drift Chamber (PDC) surrounding the target. The PDC is inside a 1-T magnetic field; the axis of the PDC cylinder and the magnetic field are parallel to the beam. Good identification has been obtained for both positive and negative pi mesons and for hydrogen and helium isotopes. Multiplicities in relativistic nucleus-nucleus reactions up to 40 have been detected, limited mainly by the present electronics.

Published
1987
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22. Exclusive measurements of mean pion multiplicities in 4He-nucleus reactions from 200 to 800 MeV/nucleon.

Author

L'Hôte D, Alard JP, Augerat J, Babinet R, Brochard F, Fodor Z, Fraysse L, Girard J, Gorodetzky P, Gosset J, Laspalles C, Lemaire MC, Lucas B, Montarou G, Parizet MJ, Poitou J, Racca C, Schimmerling W, Tamain JC, Terrien Y, Valero J, Cugnon J, and Vandermeulen J

Subjects
Carbon, Copper, Energy Transfer, Ions, Lead, Monte Carlo Method, Nuclear Physics, Helium, Mesons, Models, Theoretical, Protons, Radiometry
Abstract

Mean multiplicities of pi+ and pi- in 4He collisions with C, Cu, and Pb at 200, 600, and 800 MeV/u, and with C and Pb at 400 MeV/u have been measured using the large solid angle detector Diogene. The independence of pion multiplicity on projectile incident energy, target mass and proton multiplicity is studied in comparison with intra-nuclear cascade predictions. The discrepancy between experimental results and theory is pointed out and discussed.

Published
1987
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23. Proton production in relativistic heavy ion collisions; comparison with a thermodynamical model.

Author

Parizet MJ, Alard JP, Rahmani A, Montarou G, Augerat J, Bastid N, Demaison P, Dupieux P, Fraysse L, and Marroncle J

Subjects
Statistics as Topic, Models, Theoretical, Nuclear Physics, Protons, Thermodynamics
Abstract

Experimental results concerning proton production in nuclear collisions, obtained at Saturne with the Diogene 4 pi facility, are compared with the predictions of a thermodynamical model, using collective velocity distributions combined with a statistical thermodynamics in local rest frames. Experimental differential cross sections for alpha + nucleus and Neon + nucleus central collisions at incident energies between 200 and 800 MeV per nucleon are well reproduced by the model, for an angular range 30-110 degrees in the laboratory system. Extracted values of the temperatures are compared with those given by other authors.

Published
1989
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24. Nuclear collective flow and charged-pion emission in Ne-nucleus collisions at E/A = 800 MeV.

Author

Gosset J, Valette O, Alard JP, Augerat J, Babinet R, Bastid N, Brochard F, De Marco N, Dupieux P, Fodor Z, Fraysse L, Gorodetzky P, Lemaire MC, L'Hôte D, Lucas B, Marroncle J, Montarou G, Parizet MJ, Poitou J, Racca C, Rahmani A, Schimmerling W, and Terrien Y

Subjects
Elementary Particles, Lead, Nuclear Physics, Energy Transfer, Mesons, Models, Theoretical, Neon
Abstract

Triple-differential cross sections of charged pions were measured for collisions of Ne projectiles at E/A = 800 MeV with NaF, Nb, and Pb targets. The reaction plane was estimated event by event from the light-baryon momentum distribution. For heavy targets, preferential emission of charged pions away from the interaction zone towards the projectile side was observed in the transverse direction. Such a preferential emission, which is not predicted by cascade calculations, may be attributed to a stronger pion absorption by the heavier spectator remnant.

Published
1989
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25. Proton-proton correlations at small relative momentum in neon-nucleus collisions at E/A=400 and 800 MeV.

Author

Dupieux P, Alard JP, Augerat J, Babinet R, Bastid N, Brochard F, Charmensat P, De Marco N, Fanet H, Fodor Z, Fraysse L, Girard J, Gorodetzky P, Gosset J, Laspalles C, Lemaire MC, L'Hôte D, Lucas B, Marroncle J, Montarou G, Parizet MJ, Poitou J, Qassoud D, Racca C, and Schimmerling W

Subjects
Carbon, Elementary Particles, Lead, Models, Theoretical, Niobium, Particle Accelerators, Sodium Fluoride, Energy Transfer, Neon, Nuclear Physics, Protons
Abstract

Proton-proton small angle correlations have been measured in neon-nucleus collisions, using the 4 pi detector Diogene, at 400 and 800 MeV per nucleon incident energies. Values of the size of the emitting region are obtained by comparison with the Koonin formula, taking into account the biases of the apparatus. The dependence of the density on target mass and incident energy is also analysed.

Published
1988
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