Conveners
Session 3: Nuclear Structure, Reactions and Dynamics
- Luna Pellegri (University of the Witwatersrand and iThemba LABS)
The question of the properties of the E1 strength below the Giant Dipole Resonance (GDR) is of paramount interest for the understanding of the nuclei, for testing theoretical models and has important implications in astrophysics. The dependance of this additional strength in function of Neutron number, isospin, temperature and angular momentum is mostly unexplored. A series of experiments...
This work investigates the Pygmy Dipole Resonance (PDR) in the deformed $^{154}$Sm nucleus. The study uses the ($\vec{\gamma}$,$\vec{\gamma}^{\prime}$) reaction to excite dipole states at energies ranging from 3.5 MeV to 7.05 MeV, approaching the neutron separation energy at 8 MeV. Measurements were taken with the Clover Array at the HI$\gamma$S facility of the Triangle Universities Nuclear...
When it comes to the formation of elements, particularly those heavier than iron,
predominantly occurs through two neutron capture processes: slow
neutron capture process and rapid neutron capture process, each
contributing approximately 50%. These are known as the s- and
r-processes, respectively [1].
The neutron capture reactions 192Ir(n,γ)193Ir and 193Ir(n,γ)194Ir
were indirectly...
The electromagnetic properties of nuclei excited to the quasi-continuum region are
best studied and explained using statistical decay observables, such as the nuclear
level density (NLD) and γ-ray strength function (γSF). These quantities can be
extracted from experimental particle-γ coincidence matrix using the Oslo method and
Shape method, respectively. In this study, experiments were...
A concentration of electric dipole strength around and below the neutron separation energy is nowadays known to be common in most medium to heavy mass nuclei. While a first interpretation of this so-called Pygmy Dipole Resonance (PDR) was connected only to an oscillation of the nuclear neutron skin, the combination of complementary experiments over the past two decades has uncovered much...
