Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 11: Physik mit schweren Ionen

HK 11.4: Gruppenbericht

Freitag, 4. März 2005, 17:45–18:15, TU MA042

Mass and Isospin Effects in Multifragmentation — •Concettina Sfienti — GSI, Planckstr. 1, D-64291 Darmstadt

A systematic study of isospin effects in the breakup of projectile spectators at relativistic energies has been performed with the ALADiN spectrometer at the GSI laboratory. Four different stable and unstable projectiles ¹⁹⁷Au, ¹²⁴La, ¹²⁴Sn and ¹⁰⁷Sn, all with an incident energy of 600 AMeV, have been used, thus allowing a study of various combinations of masses and N/Z ratios in the entrance channel.
The measurement of the momentum vector and of the charge of all projectile fragments with Z>1 entering the acceptance of the ALADiN magnet has been performed with the high efficiency and resolution achieved with the TP-MUSIC IV detector.
The Rise and Fall behavior of the mean multiplicity of IMFs as a function of Z_bound and its dependence on the isotopic composition has been determined for the studied systems. Other observables investigated so far include mean N/Z values of the emitted light fragments and neutron multiplicities.