Evolution of the IVGDR and its fine structure from doubly-magic 40⁴°Ca to neutron-rich ⁴⁸Ca probed Using (p,p′) scattering

Latif, M. B. ; Usman, I. T. ; Carter, J. ; Sideras-Haddad, E. ; Donaldson, L .M. ; Jingo, M. ; Kureba, C. O. ; Pellegri, L. (2019)

CITATION: Latif, M. B., et al. 2019. Evolution of the IVGDR and its fine structure from doubly-magic 40⁴°Ca to neutron-rich ⁴⁸Ca probed Using (p,p′) scattering. Acta Physica Polonica B, 50(3):461-468, doi:10.5506/APhysPolB.50.461.

The original publication is available at https://www.actaphys.uj.edu.pl

Article

Experiments investigating the fine structure of the Isovector Giant Dipole Resonances (IVGDR) have been carried out on target nuclei 40,42,44,48Ca with 200 MeV proton inelastic scattering reactions using the high-energy resolution capability and the zero-degree set-up at the K600 magnetic spectrometer of the iThemba LABS, Cape Town, South Africa. Quasi-free scattering background contributions in the experimental data have been removed by applying a novel method of Discrete Wavelet Transform (DWT) analysis. Energy scales extracted are compared with the state-of-the-art theoretical calculations within the framework of the Quasiparticle-RPA and Relativistic Quasiparticle Time Blocking Approximation (RQTBA). For 40,48Ca, these calculations consider all major processes (Landau damping, escape width, spreading width) contributing to the damping of the IVGDR.

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