Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 59: Heavy Ion Reactions VII, Relativistic Energies

HK 59.1: Group Report

Thursday, March 19, 1998, 14:00–14:30, P

Charged Pion production in Nucleus - Nucleus Collisions at SIS Energies — •D. Pelte — Physikalisches Institut der Universit"at Heidelberg, Philosophenweg 12, D-69120 Heidelberg

The production of charged pions has been measured for several symmetric nucleus - nucleus collisions (100 < A < 400) and at several incident energies (0.4 < E < 2 AGeV) using the FOPI detector at GSI. The results are compared to the systematics of Metag [1] and Harris et al. [2]. It is shown that pion production is suppressed in heavy-mass systems. The ratio of charged pions is studied as functions of the fireball size and the rapidity. The results are compared to the equivalent data from proton - nucleus collisions [3].

[1] V. Metag, Prog. Part. Nucl. Phys. 30, 75 (1993)

[2] J.W. Harris et al., Phys. Rev. Lett. 58, 463 (1987)

[3] M.C. Lemaire et al., Phys. Rev. C43, 2711 (1991)