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Abundance of Delta resonances in $^{58}$Ni + $^{58}$Ni collisions between 1 and 2 AGeV (1999) |
- Hong, B.,
- Herrmann, N.,
- Ritman, J.L.,
- Best, D.,
- Gobbi, A.,
- Hildenbrand, K.D.,
- Kirejczyk, M.,
- Leifels, Y.,
- Pinkenburg, C.,
- Reisdorf, W.,
- Schull, D.,
- Sodan, U.,
- Wang, G.S.,
- Wienold, T.,
- Alard, J.P.,
- Amouroux, V.,
- Bastid, N.,
- Belyaev, I.,
- Berek, G.,
- Biegansky, J.,
- Buta, A.,
- Coffin, J.P.,
- Crochet, P.,
- Dona, R.,
- Dupieux, P.,
- Eskef, M.,
- Fintz, P.,
- Fodor, Z.,
- Fraysse, L.,
- Genoux-Lubain, A.,
- Goebels, G.,
- Guillaume, G.,
- Hafele, E.,
- Jundt, F.,
- Kecskemeti, J.,
- Korolija, M.,
- Kotte, R.,
- Kuhn, C.,
- Lebedev, A.,
- Legrand, I.,
- Maazouzi, C.,
- Manko, V.,
- Mosner, J.,
- Mohren, S.,
- Neubert, W.,
- Pelte, D.,
- Petrovici, M.,
- Pras, P.,
- Rami, F.,
- Roy, C.,
- Seres, Z.,
- Sikora, B.,
- Simion, V.,
- Siwek-Wilczynska, K.,
- Somov, A.,
- Tizniti, L.,
- Trzaska, M.,
- Vasilev, M.A.,
- Wagner, P.,
- Wohlfarth, D.,
- Zhilin, A.
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Abstract |
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Charged pion spectra measured in 58Ni-58Ni collisions at 1.06, 1.45 and 1.93 AGeV are interpreted in terms of a thermal model including the decay of Delta resonances. The transverse momentum spectra of pions are well reproduced by adding the pions originating from the Delta-resonance decay to the component of thermal pions, deduced from the high transverse momentum part of the pion spectra. About 10 and 18% of the nucleons are excited to Delta states at freeze-out for beam energies of 1 and 2 AGeV, respectively. |
Publication details |
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