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Seminar | Physics Division

Proton- and Neutron-Core Couplings across the Nuclide Chart

PHY Seminar

Abstract: The interplay between single-particle degrees of freedom and collective excitations outlines the dynamics of many-body quantum systems, as is the case of couplings between plasmonic oscillations and electrons in solid materials. In nuclear physics, particle-phonon coupled states emerge in isotopes located close to doubly magic nuclei and may explain peculiar phenomena, such as the quenching of spectroscopic factors as due to long-range correlations. The persistence of particle-core couplings in exotic nuclei and their microscopic origin is still attracting much attention, being closely related to the evolution of single-particle states and the robustness of shell closures.

In this context, I will present recent experimental and theoretical results on one-valence-proton and one-valence-neutron systems in different regions of the nuclide chart, especially around the doubly-closed-shells 40Ca, 48Ca and 132Sn nuclei. These isotopes haven been populated at ILL (Grenoble-France) using neutron-capture reactions on rare targets as well as neutron-induced fissions of 235U and 241Pu and studied by g-ray spectroscopy techniques with the EXILL array. Moreover, complementary multi-nucleon transfer experiments performed with heavy-ion beams, for instance at Legnaro National Laboratories (Italy), will be discussed. Experimental results are compared with state-of-the-art theoretical calculations to provide a microscopic description of particle-core coupled states, involving collective (phonons) and non-collective excitations of the core. Finally, experimental and theoretical perspectives will be addressed.