Speaker
Description
Collective dynamics in atomic nuclei arise from correlated nucleonic motion and manifest across both small- and large-amplitude excitation regimes, which are traditionally treated using distinct theoretical frameworks. In this work, we develop a unified Bayesian inference approach that consistently constrains nuclear structure parameters from diverse experimental observables spanning these regimes, enabling a statistically robust connection between nuclear structure and reaction dynamics.
In the small-amplitude regime, we analyze large-angle quasi-elastic scattering near Coulomb barrier energies using coupled-channel calculations that incorporate single- and multi-phonon vibrational excitations of both projectile and target nuclei. Ground-state quadrupole and octupole deformation parameters are extracted using Bayesian framework for several medium-to-heavy nuclear systems, with particular emphasis on reactions involving the doubly magic nucleus $^{208}$Pb. The analysis demonstrates that multi-phonon couplings are essential to reproduce experimental barrier distributions and significantly improve constraints on nuclear deformation effects, with direct relevance to heavy-ion reaction dynamics and superheavy element formation.
In the large-amplitude regime, we investigate the isovector giant dipole resonance (IVGDR) using photoabsorption and photoneutron data. Within the same Bayesian framework, nuclear structure effects such as isospin asymmetry, deformation, and shell corrections are incorporated to extract precise centroid energies and widths. These results are used to constrain the nuclear symmetry energy, yielding values consistent with independent observables including dipole polarizability and neutron-skin thickness measurements.
Overall, this work establishes a coherent and predictive framework that unifies the description of nuclear collective motion across excitation regimes. It provides stringent constraints on nuclear deformation properties and symmetry energy parameters, offering new insights into superheavy element synthesis and the nuclear equation of state relevant to astrophysical environments such as neutron stars.