Heavy-ion Coulomb excitation and photon decay of the giant dipole resonance inPb208
| Autor: | J. Barrette, J. P. Vivien, B. Fernandez, N. Alamanos, R.L. Auble, B. Haas, R. O. Sayer, A. Gillibert, W. Mittig, B. L. Burks, Yves Roland Schutz, J. Gomez del Campo, F. Auger, J. R. Beene, F. E. Bertrand, D.J. Horen, M. L. Halbert |
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| Rok vydání: | 1990 |
| Předmět: |
Physics
Nuclear reaction Nuclear and High Energy Physics Proton 010308 nuclear & particles physics Nuclear Theory Resonance Coulomb excitation 01 natural sciences 7. Clean energy Giant resonance 0103 physical sciences Neutron Atomic physics Nuclear Experiment 010306 general physics Nucleon Radioactive decay |
| Zdroj: | Physical Review C. 41:920-932 |
| ISSN: | 1089-490X 0556-2813 |
| DOI: | 10.1103/physrevc.41.920 |
| Popis: | The excitation and electromagnetic decay of the giant resonance region (8--15 MeV) in {sup 208}Pb have been measured with the {sup 208}Pb({sup 17}O,{sup 17}O{prime}) reaction at 84 MeV/nucleon. The study of coincidences between scattered {sup 17}O ions and photon decays to the {sup 208}Pb ground state, including angular correlations, serves to isolate the isovector giant dipole resonance and enable us to investigate the mechanisms of its excitation and decay in detail. The angular correlations and yields are accounted for quantitatively by a pure Coulomb excitation model of the reaction process. The distribution in energy of the ground-state photon decay cross section is well described by an approximate application of the multistep theory of nuclear reactions. The photon coincidence measurements enable us to extract the differential cross sections for the 10.6-MeV giant quadrupole and 13.9-MeV monopole resonances with low uncertainty. An analysis of the Coulomb-nuclear interference for the 10.6-MeV excitation indicates that the ratio of neutron to proton matrix elements, {ital M}{sub {ital n}}/{ital M}{sub {ital p}}, is 1.7{plus minus}0.4, consistent with a predominantly isoscalar character for the giant quadrupole resonance. |
| Databáze: | OpenAIRE |
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