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HK: Physik der Hadronen und Kerne

HK 13: Poster Session: Heavy Ions

HK 13.4: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

Pions in Spectator Fragmentation Induced by Relativistic ¹²C Projectiles — •Ketel Turzó — GSI Darmstadt, Planckstr. 1, D-64291 Darmstadt

As part of the INDRA@GSI campaign in 1998/1999, fragmentation in asymmetric systems like ¹²C+¹⁹⁷Au and ¹²C+^112,124Sn was studied at bombarding energies ranging from 95 to 1800 AMeV. At angles θ_lab ≥ 45^∘, particle detection and identification with high resolution was achieved with the Si-Si-CsI(Tl) calibration telescopes of the INDRA multidetector system, including the identification of charged pions.

Delta and pion production and absorption represent an efficient heating mechanism in collisions at relativistic energies. The present data permit the study of correlations between pion and fragment emissions, i.e. between emissions reflecting properties of the primary heating phase of the collision and of the subsequent decay of a highly equilibrated spectator system. First results, indicating an anticorrelation between the multiplicities of pions and intermediate-mass fragments for lower spectator excitations, will be presented.