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HK: Hadronen und Kerne

HK 17: Giant Resonances

HK 17.5: Talk

Monday, March 16, 1998, 18:45–19:00, E

Coulomb excitation and fragmentation of ¹³⁶Xe in relativistic heavy-ion collisions^* — •A. Grünschloß — Institut für Kernphysik, Johann Wolfgang Goethe-Universität, D-60486 Frankfurt/M.

The electromagnetic excitation of two-phonon states of giant resonances in relativistic heavy-ion collisions was investigated in the past years [1]. The cross section for the double-phonon giant dipole resonance in¹³⁶Xe was found to be enhanced by a factor of ≈2 relative to the harmonic limit [2]. At GSI we performed a new experiment with ¹³⁶Xe beams (700 A·MeV), and bombarding several targets (Pb, C, Sn). The improved experimental technique allows for a closer examination of the anharmonic effects indicated in [2]. Simultaneously, we study the process of nuclear fragmentation and derive the temperature of the prefragments from spectra of evaporated neutrons.

[1] H. Emling et al., Prog. Part. Nucl. Phys. 33 (1994) 729

[2] R. Schmidt et al., Phys. Rev. Lett. 70 (1993) 1767

^* supported by BMBF and GSI