The Oslo method has been applied to a double-digit number of experiments at the Oslo Cyclotron Laboratory (OCL) and other facilities. The method allows for extraction of nuclear level densities (NLD) and 𝛾-ray strength functions (𝛾SF) from excitation tagged 𝛾 spectra. Due to the large number of experiments performed, the nuclear physics group at the University of Oslo has a database of NLD...
I present the extraction of level densities from a fluctuation analysis of high-resolution spectra. In cases where the spectral fluctuations arise from the incoherent overlap of a single class of states with given quantum number $J^\pi$, a connection can be made between the magnitude of the signal in an autocorrelation analysis and the level spacing. This condition is best fulfilled in...
The Uppsala group has been measuring isomeric yields ratios (IYR) from fission for several years now. This work is done in collaboration with the IGISOL group of the University of Jyväskylä. The IYR are obtained using mass measurement techniques (Penning traps and multi-reflection time-of-flight), i.e., the results are not dependent on current information on, e.g., nuclear level schemes....
Knowledge of nuclear level densities remains significantly limited due to the scarcity of experimental data needed to constrain level density models. Current models rely heavily on limited experimental information derived from s-wave neutron resonance spacings. These data are only available within narrow excitation energy and spin ranges, resulting in poorly constrained models.
Alternative...
Nuclear level density (NLD) can be determined through various experimental techniques, including nuclear level counting, neutron capture reactions (via nuclear resonance widths), gamma-ray spectroscopy in the OSLO method, and particle spectroscopy in the fusion evaporation method.
NLD is strongly influenced by nuclear structure effects such as shell corrections, pairing interactions,...
The ELI-NP facility in Romania will consist of two different types of beamlines: The high-power laser system and the high-brilliance $\gamma$-ray beams. Such $\gamma$-ray beams are very selective when used for exciting atomic nuclei, as the narrow bandwidth provides a very well-defined excitation energy window, and usage of polarised photons provides clean spin-parity selectivity for...
