Studies of the Giant Dipole Resonance in $^{27}$Al, $^{40}$Ca, $^{56}$Fe, $^{58}$Ni and $^{208}$Pb with high energy-resolution inelastic proton scattering under 0$^\circ$
| Autor: | S. V. Förtsch, Achim Richter, E. Z. Buthelezi, Gordon R. J. Cooper, C. O. Kureba, Atsushi Tamii, R. Neveling, A. M. Krumbholz, F. D. Smit, M. Jingo, I. T. Usman, R. W. Fearick, P. Papka, Elias Sideras-Haddad, J. A. Swartz, I. Poltoratska, P. von Neumann-Cosel, V. Yu. Ponomarev, J. Carter |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Nuclear and High Energy Physics Photon Spectrometer Isovector Nuclear Theory 010308 nuclear & particles physics FOS: Physical sciences Coulomb excitation 01 natural sciences Resonance (particle physics) Nuclear physics Nuclear Theory (nucl-th) Dipole Giant resonance 0103 physical sciences Nuclear Experiment (nucl-ex) 010306 general physics Nuclear Experiment Characteristic energy |
| DOI: | 10.48550/arxiv.1808.02282 |
| Popis: | A survey of the fine structure of the Isovector Giant Dipole Resonance (IVGDR) was performed, using the recently commissioned zero-degree facility of the K600 magnetic spectrometer at iThemba LABS. Inelastic proton scattering at an incident energy of 200 MeV was measured on $^{27}$Al, $^{40}$Ca, $^{56}$Fe, $^{58}$Ni and $^{208}$Pb. A high energy resolution ($\rm{\Delta}\it{E} \simeq$ 40 keV FWHM) could be achieved after utilising faint-beam and dispersion-matching techniques. Considerable fine structure is observed in the energy region of the IVGDR and characteristic energy scales are extracted from the experimental data by means of a wavelet analysis. The comparison with Quasiparticle-Phonon Model (QPM) calculations provides insight into the relevance of different giant resonance decay mechanisms. Photoabsorption cross sections derived from the data assuming dominance of relativistic Coulomb excitation are in fair agreement with previous work using real photons. Comment: 15 pages, 15 figures |
| Databáze: | OpenAIRE |
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