Two-phonon giant dipole resonance in 208Pb

Authors :: Boretzky, K.
Stroth, J.
Wajda, E.
Aumann, T.
Blaich, Th.
Cub, J.
Elze, Th.W.
Emling, H.
Henning, W.
Holzmann, R.
Klingler, H.
Kulessa, R.
Kratz, J.V.
Lambrecht, D.
Leifels, Y.
Lubkiewicz, E.
Stelzer, K.
Walus, W.
Zinser, M.
Zude, E.
Source :: Physics Letters B; September 1996, Vol. 384 Issue: 1-4 p30-36, 7p
Publication Year :: 1996
Abstract: Excitation of the two-phonon isovector giant dipole resonance was observed in 208Pb 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 γ-decay probabilities are derived as well.