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Preprint
Report number GSI-2003-22
Title Two-phonon giant resonances in sup 1 sup 3 sup 6 Xe, sup 2 sup 0 sup 8 Pb, and sup 2 sup 3 sup 8 U
Author(s) Boretzky, K ; Adrich, P ; Aumann, T ; Bertulani, C A ; Cub, J ; Dostal, W ; Eberlein, B ; Elze, T W ; Emling, H ; Fallot, M 30 人のオーサーを表示
Publication 2003
Imprint Jul 2003
Number of pages 20
Subject category Nuclear Physics
Abstract The excitation of the double-phonon giant dipole resonance was observed in heavy projectile nuclei impinging on targets of high nuclear charge with energies of 500-700 MeV/nucleon. New experimental data are presented for sup 1 sup 3 sup 6 Xe and sup 2 sup 3 sup 8 U together with further analysis of earlier data on sup 2 sup 0 sup 8 Pb. Differential cross sections d sigma/dE sup * and d sigma/d theta for electromagnetic excitations were deduced. Depending on the isotope, cross sections appear to be enhanced in comparison to those expected from a purely harmonic nuclear dipole response. The cumulative effect of excitations of two-phonon states composed of one dipole and one quadrupole phonon, of predicted anharmoniticies in the double-phonon dipole response, and of damping of the dipole resonance during the collision may account for the discrepancy. In addition, decay properties of two-phonon resonances were studied and compared to that of a statistical decay.

 


 レコード 生成: 2004-06-30, 最終変更: 2009-07-13


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