Conveners
Session 5: Nuclear Structure, Reactions and Dynamics
- Akaa Daniel Ayangeakaa (University of North Carolina at Chapel Hill)
The gamma-ray decay of nuclear states in the quasi-continuum offers valuable insights into nuclear structure effects and constraints on nucleosynthesis processes. Measurement of Nuclear Level Densities (NLDs) and Photon Strength Functions (PSFs) has played a pivotal role, and will continue to do so, as we enter a highly promising era for innovative measurements. This is primarily due to the...
The presence of the low-lying dipole states on stable and unstable nuclei with neutron excess - known as Pygmy Dipole Resonances (PDR) - is well established in theoretical and experimental studies. The isospin mixed nature of the PDR allows to study the excitation with isovector and isoscalar probes.
The theoretical approaches devoted to investigate this new mode extend from the macroscopic...
This study aims to understand the Pygmy Dipole Resonance (PDR) in the deformed 154Sm nucleus. Despite previous efforts, the interpretation of the behavior and nature of this low-energy resonance remains unclear with respect to the effects of neutron excess and deformation in nuclei. This further limits the predictive power of exotic nuclei properties. The current study uses the (γ, γ′)...
The low-lying E1 strength which has been termed the pygmy dipole resonance (PDR), manifests as a concentration of 1$^{-}$ states below and around the neutron threshold. It has thus far been observed in neutron-rich nuclei and its study may have implications on the nuclear equation of state and nucleosynthesis. Since its discovery, there has been a great deal of work in an attempt to understand...
Quasicontinuum gamma decay following compound reactions - commonly called Oslo method - is probably the most important source of information on the gamma strength functions and level densities of nuclei below particle threshold. A fundamental assumption in the analysis of Oslo-type data (and in fact all astrophysical reaction network calculations) is the generalized Brink-Axel (BA) hypothesis,...
The observation of resonance-like structure in the electric dipole response of heavy nuclei at energies around or below the neutron, commonly termed pygmy dipole resonance (PDR), has been a topic leading to considerable experimental and theoretical activities in recent years [1-4]. The interest has been triggered by attempts to understand the underlying structure but also because of its impact...
Neutron-rich nuclei with A ~ 190 provide a characteristic testing ground for microscopic theories of nuclear structures. There are quite a few indications that a prolate-oblate shape transition takes place at around N = 116 in this region [1, 2].
The microscopic description of anharmonicities in nuclear quadrupole collective motions, in terms of the fermion degrees of freedom, is a...
