Orateur
Description
The study of the evolution of properties of the nucleus as a function of excitation energy, angular momentum and isospin is a path for searching for simple patterns to understand its structure. Among challenging problems in physics is the understanding of emergent collective excitation modes in interacting quantum many-body systems in terms of the microscopic degrees of freedom. Such investigations along a chain of isotopes are an ideal playground in this direction.
High-spin excited states of odd-even or odd-odd nuclei typically arise from the interplay between the odd nucleons in high-$j$ orbitals and the collective behaviour of the underlying core. In this context, Au (Z = 79) isotopes provide an excellent opportunity to explore how collective nuclear modes evolve along with high-$j$ single-particle excitations over a long isotopic chain allowing us to thus probe such an interplay. However, high-spin states in neutron-rich Au isotopes approaching N = 126 remain largely unexplored due to limited methods for their production.
In this talk we will present the investigations of such states using Multi-Nucleon Transfer reactions of $^{136}$Xe (7 MeV/u) + $^{198}$Pt performed at GANIL. The spectrometers VAMOS++ and CATLIFE were combined with AGATA and EXOGAM to measure prompt and delayed - $\gamma$-rays as a function of the excitation energy of the isotopically identified fragments. After highlighting the specificities of the measurement, we will discuss the observed regularity of the measured excitation energies as a function of neutron number and their inheritance with the corresponding states in the corresponding Hg (Z = 80) isotope along with other interesting results.