| Autor: |
Boretzky, K, Adrich, P, Aumann, T, Bertulani, C A, Cub, J, Dostal, W, Eberlein, B, Elze, T W, Emling, H, Fallot, M, Grünschloss, A, Holeczek, J, Holzmann, R, Ilievski, S, Kozhuharov, C, Kratz, J V, Kulessa, R, Leifels, Y, Leistenschneider, A, Lubkiewicz, E, Mordechai, S, Ohtsuki, T, Reiter, P, Simon, H, Stelzer, K, Stroth, J, Sümmerer, K, Surowiec, A, Wajda, E, Walús, W |
| Jazyk: |
angličtina |
| Rok vydání: |
2003 |
| Předmět: |
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| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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