Two-phonon giant dipole resonance in &quot;2&quot;0&quot;8Pb

Aumann, T.; Blaich, T.; Boretzky, K.; Cub, J.; Elze, T.W.; Emling, H.; Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany); Henning, W. (Argonne National Lab. (ANL), IL (United States)); Holzmann, R.; Klingler, H.; Krakow Univ. (Poland). Inst. of Physics); Kratz, J.V.; Kulessa, R.; Lambrecht, D. (Mainz Univ. (Germany). Inst. fuer Kernchemie); LAND Collaboration; Leifels, Y.; Lubkiewicz, E.; Stelzer, K. (Frankfurt Univ. (Germany). Inst. fuer Kernphysik); Stroth, J.; Wajda, E. (Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany); Walus, W. (Krakow Univ. (Poland). Inst. of Physics); Zinser, M.; Zude, E. (Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany))

Abstract

Excitation of the two-phonon isovector giant dipole resonance was observed in "2"0"8Pb projectiles incident on different target nuclei (C, Sn, Ho, Pb, U) at high energy (640 A.MeV). Evidence is found for a two-step electromagnetic excitation mechanism. An enhancement of 1.33(16) for the excitation cross section is observed relative to the harmonic approximation. Neutron- and #gamma#-decay probabilities are derived as well. (orig.)SIGLEAvailable from TIB Hannover: RO 801(96-27) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

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