Charged pion production in Au on Au collisions at 1 AGeV The FOPI Collaboration
Abstract Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities $ n_{gp} $ increase with the number of participants $ A_{part} $. The average pion multiplicities per participant are $$ and $$ These values are on...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Pelte, D. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1997 |
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| Anmerkung: |
© Springer-Verlag 1997 |
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| Übergeordnetes Werk: |
Enthalten in: Zeitschrift für Physik A Hadrons and nuclei - Springer Berlin Heidelberg, 1967, 357(1997), 2 vom: Juni, Seite 215-234 |
|---|---|
| Übergeordnetes Werk: |
volume:357 ; year:1997 ; number:2 ; month:06 ; pages:215-234 |
| Links: |
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| DOI / URN: |
10.1007/s002180050236 |
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| Katalog-ID: |
SPR002598795 |
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| 100 | 1 | |a Pelte, D. |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Charged pion production in Au on Au collisions at 1 AGeV The FOPI Collaboration |
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| 520 | |a Abstract Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities $ n_{gp} $ increase with the number of participants $ A_{part} $. The average pion multiplicities per participant are $$ and $$ These values are only half as large as extrapolated from the low-mass systems studied by Harris et al. The ratio $$ increases with $ A_{part} $ and decreases with the pion kinetic energies. The pion kinetic energy spectra have concave shapes, their parametrization in terms of thermal Boltzmann distributions yields a low (Tl,π) and high ($ T_{h} $,π) temperature which change with the cm emission angle Θ of the pions. In the angular range 45dg < Θ < 135° the low temperature < $ T_{l} $,$ π^{−} $ > is larger than < $ T_{l} $,$ π^{+} $ >, the high temperatures < $ T_{h} $,π−>, < $ T_{h,π+} $ > are, within experimental uncertainties, the same. The inclusive polar angular distributions of pions are anisotropic, dσ/dΩ increases for forward and backward angles. The forward — backward enhancements are independent of the pion kinetic energies or the number of participants. In addition to the preferred forward — backward emission, also the enhanced emission into the transverse direction Θ = 90° is observed for pions with high energies or for pions from near-central collisions. These observations and the shape of the rapidity spectra suggest that pions, emitted from the central rapidity region, are partly rescattered by spectator matter. The strength of the rescattering process depends only weakly on the number of participants. The experimental data are compared to the results of IQMD/GEANT calculations using momentum dependent NN interactions and a hard equation of state. The calculated pion multiplicities are approximately 50% larger than experimentally determined; the existence of secondary pion sources is reproduced by the calculation, but their predicted strengths are larger than experimentally observed. | ||
| 700 | 1 | |a Häfele, E. |4 aut | |
| 700 | 1 | |a Best, D. |4 aut | |
| 700 | 1 | |a Goebels, G. |4 aut | |
| 700 | 1 | |a Herrmann, N. |4 aut | |
| 700 | 1 | |a Pinkenburg, C. |4 aut | |
| 700 | 1 | |a Reisdorf, W. |4 aut | |
| 700 | 1 | |a Trzaska, M. |4 aut | |
| 700 | 1 | |a Alard, J. P. |4 aut | |
| 700 | 1 | |a Amouroux, V. |4 aut | |
| 700 | 1 | |a Andronic, A. |4 aut | |
| 700 | 1 | |a Basrak, Z. |4 aut | |
| 700 | 1 | |a Bastid, N. |4 aut | |
| 700 | 1 | |a Belyaev, I. |4 aut | |
| 700 | 1 | |a Biegansky, J. |4 aut | |
| 700 | 1 | |a Buta, A. |4 aut | |
| 700 | 1 | |a Čaplar, R. |4 aut | |
| 700 | 1 | |a Cindro, N. |4 aut | |
| 700 | 1 | |a Coffin, J. P. |4 aut | |
| 700 | 1 | |a Crochet, P. |4 aut | |
| 700 | 1 | |a Dupieux, P. |4 aut | |
| 700 | 1 | |a Dżelalija, M. |4 aut | |
| 700 | 1 | |a Erö, J. |4 aut | |
| 700 | 1 | |a Eskef, M. |4 aut | |
| 700 | 1 | |a Fintz, P. |4 aut | |
| 700 | 1 | |a Fodor, Z. |4 aut | |
| 700 | 1 | |a Genoux-Lubain, A. |4 aut | |
| 700 | 1 | |a Gobbi, A. |4 aut | |
| 700 | 1 | |a Guillaume, G. |4 aut | |
| 700 | 1 | |a Hildenbrand, K. D. |4 aut | |
| 700 | 1 | |a Hong, B. |4 aut | |
| 700 | 1 | |a Jundt, F. |4 aut | |
| 700 | 1 | |a Kecskemeti, J. |4 aut | |
| 700 | 1 | |a Kirejczyk, M. |4 aut | |
| 700 | 1 | |a Koncz, P. |4 aut | |
| 700 | 1 | |a Korolija, M. |4 aut | |
| 700 | 1 | |a Korchagin, Y. |4 aut | |
| 700 | 1 | |a Kotte, R. |4 aut | |
| 700 | 1 | |a Kuhn, C. |4 aut | |
| 700 | 1 | |a Lambrecht, D. |4 aut | |
| 700 | 1 | |a Lebedev, A. |4 aut | |
| 700 | 1 | |a Legrand, I. |4 aut | |
| 700 | 1 | |a Leifels, Y. |4 aut | |
| 700 | 1 | |a Manko, V. |4 aut | |
| 700 | 1 | |a Merlitz, H. |4 aut | |
| 700 | 1 | |a Mösner, J. |4 aut | |
| 700 | 1 | |a Mohren, S. |4 aut | |
| 700 | 1 | |a Moisa, D. |4 aut | |
| 700 | 1 | |a Neubert, W. |4 aut | |
| 700 | 1 | |a Petrovici, M. |4 aut | |
| 700 | 1 | |a Pras, P. |4 aut | |
| 700 | 1 | |a Rami, F. |4 aut | |
| 700 | 1 | |a Ramillien, V. |4 aut | |
| 700 | 1 | |a Ritman, J. L. |4 aut | |
| 700 | 1 | |a Roy, C. |4 aut | |
| 700 | 1 | |a Schüll, D. |4 aut | |
| 700 | 1 | |a Seres, Z. |4 aut | |
| 700 | 1 | |a Sikora, B. |4 aut | |
| 700 | 1 | |a Simion, V. |4 aut | |
| 700 | 1 | |a Siwek-Wilczynska, K. |4 aut | |
| 700 | 1 | |a Smolyankin, V. |4 aut | |
| 700 | 1 | |a Sodan, U. |4 aut | |
| 700 | 1 | |a Vasiliev, M. A. |4 aut | |
| 700 | 1 | |a Wagner, P. |4 aut | |
| 700 | 1 | |a Wang, G. S. |4 aut | |
| 700 | 1 | |a Wienold, T. |4 aut | |
| 700 | 1 | |a Wohlfarth, D. |4 aut | |
| 700 | 1 | |a Zhilin, A. |4 aut | |
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10.1007/s002180050236 doi (DE-627)SPR002598795 (SPR)s002180050236-e DE-627 ger DE-627 rakwb eng Pelte, D. verfasserin aut Charged pion production in Au on Au collisions at 1 AGeV The FOPI Collaboration 1997 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Springer-Verlag 1997 Abstract Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities $ n_{gp} $ increase with the number of participants $ A_{part} $. The average pion multiplicities per participant are $$ and $$ These values are only half as large as extrapolated from the low-mass systems studied by Harris et al. The ratio $$ increases with $ A_{part} $ and decreases with the pion kinetic energies. The pion kinetic energy spectra have concave shapes, their parametrization in terms of thermal Boltzmann distributions yields a low (Tl,π) and high ($ T_{h} $,π) temperature which change with the cm emission angle Θ of the pions. In the angular range 45dg < Θ < 135° the low temperature < $ T_{l} $,$ π^{−} $ > is larger than < $ T_{l} $,$ π^{+} $ >, the high temperatures < $ T_{h} $,π−>, < $ T_{h,π+} $ > are, within experimental uncertainties, the same. The inclusive polar angular distributions of pions are anisotropic, dσ/dΩ increases for forward and backward angles. The forward — backward enhancements are independent of the pion kinetic energies or the number of participants. In addition to the preferred forward — backward emission, also the enhanced emission into the transverse direction Θ = 90° is observed for pions with high energies or for pions from near-central collisions. These observations and the shape of the rapidity spectra suggest that pions, emitted from the central rapidity region, are partly rescattered by spectator matter. The strength of the rescattering process depends only weakly on the number of participants. The experimental data are compared to the results of IQMD/GEANT calculations using momentum dependent NN interactions and a hard equation of state. The calculated pion multiplicities are approximately 50% larger than experimentally determined; the existence of secondary pion sources is reproduced by the calculation, but their predicted strengths are larger than experimentally observed. Häfele, E. aut Best, D. aut Goebels, G. aut Herrmann, N. aut Pinkenburg, C. aut Reisdorf, W. aut Trzaska, M. aut Alard, J. P. aut Amouroux, V. aut Andronic, A. aut Basrak, Z. aut Bastid, N. aut Belyaev, I. aut Biegansky, J. aut Buta, A. aut Čaplar, R. aut Cindro, N. aut Coffin, J. P. aut Crochet, P. aut Dupieux, P. aut Dżelalija, M. aut Erö, J. aut Eskef, M. aut Fintz, P. aut Fodor, Z. aut Genoux-Lubain, A. aut Gobbi, A. aut Guillaume, G. aut Hildenbrand, K. D. aut Hong, B. aut Jundt, F. aut Kecskemeti, J. aut Kirejczyk, M. aut Koncz, P. aut Korolija, M. aut Korchagin, Y. aut Kotte, R. aut Kuhn, C. aut Lambrecht, D. aut Lebedev, A. aut Legrand, I. aut Leifels, Y. aut Manko, V. aut Merlitz, H. aut Mösner, J. aut Mohren, S. aut Moisa, D. aut Neubert, W. aut Petrovici, M. aut Pras, P. aut Rami, F. aut Ramillien, V. aut Ritman, J. L. aut Roy, C. aut Schüll, D. aut Seres, Z. aut Sikora, B. aut Simion, V. aut Siwek-Wilczynska, K. aut Smolyankin, V. aut Sodan, U. aut Vasiliev, M. A. aut Wagner, P. aut Wang, G. S. aut Wienold, T. aut Wohlfarth, D. aut Zhilin, A. aut Enthalten in Zeitschrift für Physik A Hadrons and nuclei Springer Berlin Heidelberg, 1967 357(1997), 2 vom: Juni, Seite 215-234 (DE-627)SPR002100037 nnns volume:357 year:1997 number:2 month:06 pages:215-234 https://dx.doi.org/10.1007/s002180050236 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER AR 357 1997 2 06 215-234 |
| spelling |
10.1007/s002180050236 doi (DE-627)SPR002598795 (SPR)s002180050236-e DE-627 ger DE-627 rakwb eng Pelte, D. verfasserin aut Charged pion production in Au on Au collisions at 1 AGeV The FOPI Collaboration 1997 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Springer-Verlag 1997 Abstract Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities $ n_{gp} $ increase with the number of participants $ A_{part} $. The average pion multiplicities per participant are $$ and $$ These values are only half as large as extrapolated from the low-mass systems studied by Harris et al. The ratio $$ increases with $ A_{part} $ and decreases with the pion kinetic energies. The pion kinetic energy spectra have concave shapes, their parametrization in terms of thermal Boltzmann distributions yields a low (Tl,π) and high ($ T_{h} $,π) temperature which change with the cm emission angle Θ of the pions. In the angular range 45dg < Θ < 135° the low temperature < $ T_{l} $,$ π^{−} $ > is larger than < $ T_{l} $,$ π^{+} $ >, the high temperatures < $ T_{h} $,π−>, < $ T_{h,π+} $ > are, within experimental uncertainties, the same. The inclusive polar angular distributions of pions are anisotropic, dσ/dΩ increases for forward and backward angles. The forward — backward enhancements are independent of the pion kinetic energies or the number of participants. In addition to the preferred forward — backward emission, also the enhanced emission into the transverse direction Θ = 90° is observed for pions with high energies or for pions from near-central collisions. These observations and the shape of the rapidity spectra suggest that pions, emitted from the central rapidity region, are partly rescattered by spectator matter. The strength of the rescattering process depends only weakly on the number of participants. The experimental data are compared to the results of IQMD/GEANT calculations using momentum dependent NN interactions and a hard equation of state. The calculated pion multiplicities are approximately 50% larger than experimentally determined; the existence of secondary pion sources is reproduced by the calculation, but their predicted strengths are larger than experimentally observed. Häfele, E. aut Best, D. aut Goebels, G. aut Herrmann, N. aut Pinkenburg, C. aut Reisdorf, W. aut Trzaska, M. aut Alard, J. P. aut Amouroux, V. aut Andronic, A. aut Basrak, Z. aut Bastid, N. aut Belyaev, I. aut Biegansky, J. aut Buta, A. aut Čaplar, R. aut Cindro, N. aut Coffin, J. P. aut Crochet, P. aut Dupieux, P. aut Dżelalija, M. aut Erö, J. aut Eskef, M. aut Fintz, P. aut Fodor, Z. aut Genoux-Lubain, A. aut Gobbi, A. aut Guillaume, G. aut Hildenbrand, K. D. aut Hong, B. aut Jundt, F. aut Kecskemeti, J. aut Kirejczyk, M. aut Koncz, P. aut Korolija, M. aut Korchagin, Y. aut Kotte, R. aut Kuhn, C. aut Lambrecht, D. aut Lebedev, A. aut Legrand, I. aut Leifels, Y. aut Manko, V. aut Merlitz, H. aut Mösner, J. aut Mohren, S. aut Moisa, D. aut Neubert, W. aut Petrovici, M. aut Pras, P. aut Rami, F. aut Ramillien, V. aut Ritman, J. L. aut Roy, C. aut Schüll, D. aut Seres, Z. aut Sikora, B. aut Simion, V. aut Siwek-Wilczynska, K. aut Smolyankin, V. aut Sodan, U. aut Vasiliev, M. A. aut Wagner, P. aut Wang, G. S. aut Wienold, T. aut Wohlfarth, D. aut Zhilin, A. aut Enthalten in Zeitschrift für Physik A Hadrons and nuclei Springer Berlin Heidelberg, 1967 357(1997), 2 vom: Juni, Seite 215-234 (DE-627)SPR002100037 nnns volume:357 year:1997 number:2 month:06 pages:215-234 https://dx.doi.org/10.1007/s002180050236 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER AR 357 1997 2 06 215-234 |
| allfields_unstemmed |
10.1007/s002180050236 doi (DE-627)SPR002598795 (SPR)s002180050236-e DE-627 ger DE-627 rakwb eng Pelte, D. verfasserin aut Charged pion production in Au on Au collisions at 1 AGeV The FOPI Collaboration 1997 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Springer-Verlag 1997 Abstract Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities $ n_{gp} $ increase with the number of participants $ A_{part} $. The average pion multiplicities per participant are $$ and $$ These values are only half as large as extrapolated from the low-mass systems studied by Harris et al. The ratio $$ increases with $ A_{part} $ and decreases with the pion kinetic energies. The pion kinetic energy spectra have concave shapes, their parametrization in terms of thermal Boltzmann distributions yields a low (Tl,π) and high ($ T_{h} $,π) temperature which change with the cm emission angle Θ of the pions. In the angular range 45dg < Θ < 135° the low temperature < $ T_{l} $,$ π^{−} $ > is larger than < $ T_{l} $,$ π^{+} $ >, the high temperatures < $ T_{h} $,π−>, < $ T_{h,π+} $ > are, within experimental uncertainties, the same. The inclusive polar angular distributions of pions are anisotropic, dσ/dΩ increases for forward and backward angles. The forward — backward enhancements are independent of the pion kinetic energies or the number of participants. In addition to the preferred forward — backward emission, also the enhanced emission into the transverse direction Θ = 90° is observed for pions with high energies or for pions from near-central collisions. These observations and the shape of the rapidity spectra suggest that pions, emitted from the central rapidity region, are partly rescattered by spectator matter. The strength of the rescattering process depends only weakly on the number of participants. The experimental data are compared to the results of IQMD/GEANT calculations using momentum dependent NN interactions and a hard equation of state. The calculated pion multiplicities are approximately 50% larger than experimentally determined; the existence of secondary pion sources is reproduced by the calculation, but their predicted strengths are larger than experimentally observed. Häfele, E. aut Best, D. aut Goebels, G. aut Herrmann, N. aut Pinkenburg, C. aut Reisdorf, W. aut Trzaska, M. aut Alard, J. P. aut Amouroux, V. aut Andronic, A. aut Basrak, Z. aut Bastid, N. aut Belyaev, I. aut Biegansky, J. aut Buta, A. aut Čaplar, R. aut Cindro, N. aut Coffin, J. P. aut Crochet, P. aut Dupieux, P. aut Dżelalija, M. aut Erö, J. aut Eskef, M. aut Fintz, P. aut Fodor, Z. aut Genoux-Lubain, A. aut Gobbi, A. aut Guillaume, G. aut Hildenbrand, K. D. aut Hong, B. aut Jundt, F. aut Kecskemeti, J. aut Kirejczyk, M. aut Koncz, P. aut Korolija, M. aut Korchagin, Y. aut Kotte, R. aut Kuhn, C. aut Lambrecht, D. aut Lebedev, A. aut Legrand, I. aut Leifels, Y. aut Manko, V. aut Merlitz, H. aut Mösner, J. aut Mohren, S. aut Moisa, D. aut Neubert, W. aut Petrovici, M. aut Pras, P. aut Rami, F. aut Ramillien, V. aut Ritman, J. L. aut Roy, C. aut Schüll, D. aut Seres, Z. aut Sikora, B. aut Simion, V. aut Siwek-Wilczynska, K. aut Smolyankin, V. aut Sodan, U. aut Vasiliev, M. A. aut Wagner, P. aut Wang, G. S. aut Wienold, T. aut Wohlfarth, D. aut Zhilin, A. aut Enthalten in Zeitschrift für Physik A Hadrons and nuclei Springer Berlin Heidelberg, 1967 357(1997), 2 vom: Juni, Seite 215-234 (DE-627)SPR002100037 nnns volume:357 year:1997 number:2 month:06 pages:215-234 https://dx.doi.org/10.1007/s002180050236 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER AR 357 1997 2 06 215-234 |
| allfieldsGer |
10.1007/s002180050236 doi (DE-627)SPR002598795 (SPR)s002180050236-e DE-627 ger DE-627 rakwb eng Pelte, D. verfasserin aut Charged pion production in Au on Au collisions at 1 AGeV The FOPI Collaboration 1997 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Springer-Verlag 1997 Abstract Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities $ n_{gp} $ increase with the number of participants $ A_{part} $. The average pion multiplicities per participant are $$ and $$ These values are only half as large as extrapolated from the low-mass systems studied by Harris et al. The ratio $$ increases with $ A_{part} $ and decreases with the pion kinetic energies. The pion kinetic energy spectra have concave shapes, their parametrization in terms of thermal Boltzmann distributions yields a low (Tl,π) and high ($ T_{h} $,π) temperature which change with the cm emission angle Θ of the pions. In the angular range 45dg < Θ < 135° the low temperature < $ T_{l} $,$ π^{−} $ > is larger than < $ T_{l} $,$ π^{+} $ >, the high temperatures < $ T_{h} $,π−>, < $ T_{h,π+} $ > are, within experimental uncertainties, the same. The inclusive polar angular distributions of pions are anisotropic, dσ/dΩ increases for forward and backward angles. The forward — backward enhancements are independent of the pion kinetic energies or the number of participants. In addition to the preferred forward — backward emission, also the enhanced emission into the transverse direction Θ = 90° is observed for pions with high energies or for pions from near-central collisions. These observations and the shape of the rapidity spectra suggest that pions, emitted from the central rapidity region, are partly rescattered by spectator matter. The strength of the rescattering process depends only weakly on the number of participants. The experimental data are compared to the results of IQMD/GEANT calculations using momentum dependent NN interactions and a hard equation of state. The calculated pion multiplicities are approximately 50% larger than experimentally determined; the existence of secondary pion sources is reproduced by the calculation, but their predicted strengths are larger than experimentally observed. Häfele, E. aut Best, D. aut Goebels, G. aut Herrmann, N. aut Pinkenburg, C. aut Reisdorf, W. aut Trzaska, M. aut Alard, J. P. aut Amouroux, V. aut Andronic, A. aut Basrak, Z. aut Bastid, N. aut Belyaev, I. aut Biegansky, J. aut Buta, A. aut Čaplar, R. aut Cindro, N. aut Coffin, J. P. aut Crochet, P. aut Dupieux, P. aut Dżelalija, M. aut Erö, J. aut Eskef, M. aut Fintz, P. aut Fodor, Z. aut Genoux-Lubain, A. aut Gobbi, A. aut Guillaume, G. aut Hildenbrand, K. D. aut Hong, B. aut Jundt, F. aut Kecskemeti, J. aut Kirejczyk, M. aut Koncz, P. aut Korolija, M. aut Korchagin, Y. aut Kotte, R. aut Kuhn, C. aut Lambrecht, D. aut Lebedev, A. aut Legrand, I. aut Leifels, Y. aut Manko, V. aut Merlitz, H. aut Mösner, J. aut Mohren, S. aut Moisa, D. aut Neubert, W. aut Petrovici, M. aut Pras, P. aut Rami, F. aut Ramillien, V. aut Ritman, J. L. aut Roy, C. aut Schüll, D. aut Seres, Z. aut Sikora, B. aut Simion, V. aut Siwek-Wilczynska, K. aut Smolyankin, V. aut Sodan, U. aut Vasiliev, M. A. aut Wagner, P. aut Wang, G. S. aut Wienold, T. aut Wohlfarth, D. aut Zhilin, A. aut Enthalten in Zeitschrift für Physik A Hadrons and nuclei Springer Berlin Heidelberg, 1967 357(1997), 2 vom: Juni, Seite 215-234 (DE-627)SPR002100037 nnns volume:357 year:1997 number:2 month:06 pages:215-234 https://dx.doi.org/10.1007/s002180050236 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER AR 357 1997 2 06 215-234 |
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10.1007/s002180050236 doi (DE-627)SPR002598795 (SPR)s002180050236-e DE-627 ger DE-627 rakwb eng Pelte, D. verfasserin aut Charged pion production in Au on Au collisions at 1 AGeV The FOPI Collaboration 1997 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © Springer-Verlag 1997 Abstract Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities $ n_{gp} $ increase with the number of participants $ A_{part} $. The average pion multiplicities per participant are $$ and $$ These values are only half as large as extrapolated from the low-mass systems studied by Harris et al. The ratio $$ increases with $ A_{part} $ and decreases with the pion kinetic energies. The pion kinetic energy spectra have concave shapes, their parametrization in terms of thermal Boltzmann distributions yields a low (Tl,π) and high ($ T_{h} $,π) temperature which change with the cm emission angle Θ of the pions. In the angular range 45dg < Θ < 135° the low temperature < $ T_{l} $,$ π^{−} $ > is larger than < $ T_{l} $,$ π^{+} $ >, the high temperatures < $ T_{h} $,π−>, < $ T_{h,π+} $ > are, within experimental uncertainties, the same. The inclusive polar angular distributions of pions are anisotropic, dσ/dΩ increases for forward and backward angles. The forward — backward enhancements are independent of the pion kinetic energies or the number of participants. In addition to the preferred forward — backward emission, also the enhanced emission into the transverse direction Θ = 90° is observed for pions with high energies or for pions from near-central collisions. These observations and the shape of the rapidity spectra suggest that pions, emitted from the central rapidity region, are partly rescattered by spectator matter. The strength of the rescattering process depends only weakly on the number of participants. The experimental data are compared to the results of IQMD/GEANT calculations using momentum dependent NN interactions and a hard equation of state. The calculated pion multiplicities are approximately 50% larger than experimentally determined; the existence of secondary pion sources is reproduced by the calculation, but their predicted strengths are larger than experimentally observed. Häfele, E. aut Best, D. aut Goebels, G. aut Herrmann, N. aut Pinkenburg, C. aut Reisdorf, W. aut Trzaska, M. aut Alard, J. P. aut Amouroux, V. aut Andronic, A. aut Basrak, Z. aut Bastid, N. aut Belyaev, I. aut Biegansky, J. aut Buta, A. aut Čaplar, R. aut Cindro, N. aut Coffin, J. P. aut Crochet, P. aut Dupieux, P. aut Dżelalija, M. aut Erö, J. aut Eskef, M. aut Fintz, P. aut Fodor, Z. aut Genoux-Lubain, A. aut Gobbi, A. aut Guillaume, G. aut Hildenbrand, K. D. aut Hong, B. aut Jundt, F. aut Kecskemeti, J. aut Kirejczyk, M. aut Koncz, P. aut Korolija, M. aut Korchagin, Y. aut Kotte, R. aut Kuhn, C. aut Lambrecht, D. aut Lebedev, A. aut Legrand, I. aut Leifels, Y. aut Manko, V. aut Merlitz, H. aut Mösner, J. aut Mohren, S. aut Moisa, D. aut Neubert, W. aut Petrovici, M. aut Pras, P. aut Rami, F. aut Ramillien, V. aut Ritman, J. L. aut Roy, C. aut Schüll, D. aut Seres, Z. aut Sikora, B. aut Simion, V. aut Siwek-Wilczynska, K. aut Smolyankin, V. aut Sodan, U. aut Vasiliev, M. A. aut Wagner, P. aut Wang, G. S. aut Wienold, T. aut Wohlfarth, D. aut Zhilin, A. aut Enthalten in Zeitschrift für Physik A Hadrons and nuclei Springer Berlin Heidelberg, 1967 357(1997), 2 vom: Juni, Seite 215-234 (DE-627)SPR002100037 nnns volume:357 year:1997 number:2 month:06 pages:215-234 https://dx.doi.org/10.1007/s002180050236 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER AR 357 1997 2 06 215-234 |
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Pelte, D. Häfele, E. Best, D. Goebels, G. Herrmann, N. Pinkenburg, C. Reisdorf, W. Trzaska, M. Alard, J. P. Amouroux, V. Andronic, A. Basrak, Z. Bastid, N. Belyaev, I. Biegansky, J. Buta, A. Čaplar, R. Cindro, N. Coffin, J. P. Crochet, P. Dupieux, P. Dżelalija, M. Erö, J. Eskef, M. Fintz, P. Fodor, Z. Genoux-Lubain, A. Gobbi, A. Guillaume, G. Hildenbrand, K. D. Hong, B. Jundt, F. Kecskemeti, J. Kirejczyk, M. Koncz, P. Korolija, M. Korchagin, Y. Kotte, R. Kuhn, C. Lambrecht, D. Lebedev, A. Legrand, I. Leifels, Y. Manko, V. Merlitz, H. Mösner, J. Mohren, S. Moisa, D. Neubert, W. Petrovici, M. Pras, P. Rami, F. Ramillien, V. Ritman, J. L. Roy, C. Schüll, D. Seres, Z. Sikora, B. Simion, V. Siwek-Wilczynska, K. Smolyankin, V. Sodan, U. Vasiliev, M. A. Wagner, P. Wang, G. S. Wienold, T. Wohlfarth, D. Zhilin, A. |
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Elektronische Aufsätze |
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10.1007/s002180050236 |
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charged pion production in au on au collisions at 1 agev the fopi collaboration |
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Charged pion production in Au on Au collisions at 1 AGeV The FOPI Collaboration |
| abstract |
Abstract Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities $ n_{gp} $ increase with the number of participants $ A_{part} $. The average pion multiplicities per participant are $$ and $$ These values are only half as large as extrapolated from the low-mass systems studied by Harris et al. The ratio $$ increases with $ A_{part} $ and decreases with the pion kinetic energies. The pion kinetic energy spectra have concave shapes, their parametrization in terms of thermal Boltzmann distributions yields a low (Tl,π) and high ($ T_{h} $,π) temperature which change with the cm emission angle Θ of the pions. In the angular range 45dg < Θ < 135° the low temperature < $ T_{l} $,$ π^{−} $ > is larger than < $ T_{l} $,$ π^{+} $ >, the high temperatures < $ T_{h} $,π−>, < $ T_{h,π+} $ > are, within experimental uncertainties, the same. The inclusive polar angular distributions of pions are anisotropic, dσ/dΩ increases for forward and backward angles. The forward — backward enhancements are independent of the pion kinetic energies or the number of participants. In addition to the preferred forward — backward emission, also the enhanced emission into the transverse direction Θ = 90° is observed for pions with high energies or for pions from near-central collisions. These observations and the shape of the rapidity spectra suggest that pions, emitted from the central rapidity region, are partly rescattered by spectator matter. The strength of the rescattering process depends only weakly on the number of participants. The experimental data are compared to the results of IQMD/GEANT calculations using momentum dependent NN interactions and a hard equation of state. The calculated pion multiplicities are approximately 50% larger than experimentally determined; the existence of secondary pion sources is reproduced by the calculation, but their predicted strengths are larger than experimentally observed. © Springer-Verlag 1997 |
| abstractGer |
Abstract Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities $ n_{gp} $ increase with the number of participants $ A_{part} $. The average pion multiplicities per participant are $$ and $$ These values are only half as large as extrapolated from the low-mass systems studied by Harris et al. The ratio $$ increases with $ A_{part} $ and decreases with the pion kinetic energies. The pion kinetic energy spectra have concave shapes, their parametrization in terms of thermal Boltzmann distributions yields a low (Tl,π) and high ($ T_{h} $,π) temperature which change with the cm emission angle Θ of the pions. In the angular range 45dg < Θ < 135° the low temperature < $ T_{l} $,$ π^{−} $ > is larger than < $ T_{l} $,$ π^{+} $ >, the high temperatures < $ T_{h} $,π−>, < $ T_{h,π+} $ > are, within experimental uncertainties, the same. The inclusive polar angular distributions of pions are anisotropic, dσ/dΩ increases for forward and backward angles. The forward — backward enhancements are independent of the pion kinetic energies or the number of participants. In addition to the preferred forward — backward emission, also the enhanced emission into the transverse direction Θ = 90° is observed for pions with high energies or for pions from near-central collisions. These observations and the shape of the rapidity spectra suggest that pions, emitted from the central rapidity region, are partly rescattered by spectator matter. The strength of the rescattering process depends only weakly on the number of participants. The experimental data are compared to the results of IQMD/GEANT calculations using momentum dependent NN interactions and a hard equation of state. The calculated pion multiplicities are approximately 50% larger than experimentally determined; the existence of secondary pion sources is reproduced by the calculation, but their predicted strengths are larger than experimentally observed. © Springer-Verlag 1997 |
| abstract_unstemmed |
Abstract Charged pions are measured with the 4π detector FOPI at GSI using the Au on Au reaction at 1.06 AGeV bombarding energy. The pion multiplicities $ n_{gp} $ increase with the number of participants $ A_{part} $. The average pion multiplicities per participant are $$ and $$ These values are only half as large as extrapolated from the low-mass systems studied by Harris et al. The ratio $$ increases with $ A_{part} $ and decreases with the pion kinetic energies. The pion kinetic energy spectra have concave shapes, their parametrization in terms of thermal Boltzmann distributions yields a low (Tl,π) and high ($ T_{h} $,π) temperature which change with the cm emission angle Θ of the pions. In the angular range 45dg < Θ < 135° the low temperature < $ T_{l} $,$ π^{−} $ > is larger than < $ T_{l} $,$ π^{+} $ >, the high temperatures < $ T_{h} $,π−>, < $ T_{h,π+} $ > are, within experimental uncertainties, the same. The inclusive polar angular distributions of pions are anisotropic, dσ/dΩ increases for forward and backward angles. The forward — backward enhancements are independent of the pion kinetic energies or the number of participants. In addition to the preferred forward — backward emission, also the enhanced emission into the transverse direction Θ = 90° is observed for pions with high energies or for pions from near-central collisions. These observations and the shape of the rapidity spectra suggest that pions, emitted from the central rapidity region, are partly rescattered by spectator matter. The strength of the rescattering process depends only weakly on the number of participants. The experimental data are compared to the results of IQMD/GEANT calculations using momentum dependent NN interactions and a hard equation of state. The calculated pion multiplicities are approximately 50% larger than experimentally determined; the existence of secondary pion sources is reproduced by the calculation, but their predicted strengths are larger than experimentally observed. © Springer-Verlag 1997 |
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Häfele, E. Best, D. Goebels, G. Herrmann, N. Pinkenburg, C. Reisdorf, W. Trzaska, M. Alard, J. P. Amouroux, V. Andronic, A. Basrak, Z. Bastid, N. Belyaev, I. Biegansky, J. Buta, A. Čaplar, R. Cindro, N. Coffin, J. P. Crochet, P. Dupieux, P. Dżelalija, M. Erö, J. Eskef, M. Fintz, P. Fodor, Z. Genoux-Lubain, A. Gobbi, A. Guillaume, G. Hildenbrand, K. D. Hong, B. Jundt, F. Kecskemeti, J. Kirejczyk, M. Koncz, P. Korolija, M. Korchagin, Y. Kotte, R. Kuhn, C. Lambrecht, D. Lebedev, A. Legrand, I. Leifels, Y. Manko, V. Merlitz, H. Mösner, J. Mohren, S. Moisa, D. Neubert, W. Petrovici, M. Pras, P. Rami, F. Ramillien, V. Ritman, J. L. Roy, C. Schüll, D. Seres, Z. Sikora, B. Simion, V. Siwek-Wilczynska, K. Smolyankin, V. Sodan, U. Vasiliev, M. A. Wagner, P. Wang, G. S. Wienold, T. Wohlfarth, D. Zhilin, A. |
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Häfele, E. Best, D. Goebels, G. Herrmann, N. Pinkenburg, C. Reisdorf, W. Trzaska, M. Alard, J. P. Amouroux, V. Andronic, A. Basrak, Z. Bastid, N. Belyaev, I. Biegansky, J. Buta, A. Čaplar, R. Cindro, N. Coffin, J. P. Crochet, P. Dupieux, P. Dżelalija, M. Erö, J. Eskef, M. Fintz, P. Fodor, Z. Genoux-Lubain, A. Gobbi, A. Guillaume, G. Hildenbrand, K. D. Hong, B. Jundt, F. Kecskemeti, J. Kirejczyk, M. Koncz, P. Korolija, M. Korchagin, Y. Kotte, R. Kuhn, C. Lambrecht, D. Lebedev, A. Legrand, I. Leifels, Y. Manko, V. Merlitz, H. Mösner, J. Mohren, S. Moisa, D. Neubert, W. Petrovici, M. Pras, P. Rami, F. Ramillien, V. Ritman, J. L. Roy, C. Schüll, D. Seres, Z. Sikora, B. Simion, V. Siwek-Wilczynska, K. Smolyankin, V. Sodan, U. Vasiliev, M. A. Wagner, P. Wang, G. S. Wienold, T. Wohlfarth, D. Zhilin, A. |
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