Conveners
Graduate Student Session: Research and Applications with Real Photons
- Norbert Pietralla (TU Darmstadt)
Real photon-scattering experiments are a well-established technique to investigate dipole-excitation modes due to the low angular-momentum transfer of photons [1-3]. On the one hand, the usage of an energetically-continuous $\gamma$-ray beam enables the determination of absolute transition strengths in a broad energy range. On the other hand, $\left(\gamma,\gamma'\right)$ experiments utilizing...
The Brink-Axel (BA) hypothesis states that the transition probability between two groups of states, described by the photon strength function (PSF) for a given multipolarity, only depends on the energy difference between the states and not on their intrinsic properties. As a consequence, the upward (absorption/excitation) and downward (emission/deexcitation) PSF are expected to be the same....
The structure of the $^{68}$Zn isotope is investigated using nuclear resonance fluorescence, where low-spin levels were excited using linearly polarized photon beams at energies ranging from 3 MeV to the particle threshold using the High Intensity Gamma-Ray Source. This nucleus is the isotone of $^{66}$Ni where triple shape coexistence has been established recently.
Excited states of interest...
The giant dipole resonance (GDR) is one of the most fundamental nuclear excitations and it dominates the dipole response of all nuclei. Its evolution from a single-humped structure to a double-humped one is considered as one of the prime signatures of nuclear deformation. Yet, its $\gamma$-decay behavior, despite being a key property, is still poorly characterized.
Recently, novel data on...
