Speaker
Description
The status of the FLUKA code and many important physics developments occurred after SATIF15 will be presented.
The FLUKA photonuclear interaction models as developed in the 90’s by A.Fassò were a breakthrough for the community. Nowadays new data and better theoretical understanding allow for a better and more complete description of photonuclear interactions. Therefore the FLUKA photonuclear interaction models have been completely reworked. The previous implementation was replaced with a completely new approach for all energies above the quasi-deuteron region. The talk will describe how the new models have been implemented, comparing with cross section data ranging from proton to uranium targets. The description of photon interaction is no longer based on transforming the incoming photon into a pseudo-π0, but in the resonance region the photon is directly treated as such, combining gamma-nucleon interactions, two and three nucleon absorption, in a framework where the Delta resonance modifications in the nuclear medium are now properly accounted for. At higher energies, where the VMD approach takes place, the photon is now treated as a virtual vector meson, taking into account the corresponding hadronic resonance interactions and decay in nuclei. At the same time the GDR cross sections for many important isotopes have been revised and updated taking into consideration the most recent data and evaluations.
Pointwise S(α,β) treatment for neutron in the thermal energy range is now implemented with a FLUKA specific algorithm. Incoherent inelastic [S(α,β)], incoherent elastic, and coherent elastic are all supported within a fully continuous approach.
Important developments for photon interactions will also be described, in particular the implementation of complex refraction indexes for X-ray reflection at boundaries. Ortho-positronium annihilation in 3 photons is now supported with the proper matrix element: the relative probability of ortho- and para-positronium annihilation can be changed by the user in order to study possible effects of the chemical environment of the material where the annihilation takes place.
On a more technical side, the latest ICRU/ICRP conversion coefficients are now available in FLUKA, as well as state-of-the-art spectra for Galactic Cosmic Rays, along with built-in sampling for some popular neutron sources, 252Cf, Am-Be, Am-B, D-D and D-T.
For all these topics examples will be given assuming the time will be enough.
| Scientific Topic 2 | Code status, development and model converters |
|---|---|
| Scientific Topic 3 | Code benchmarking and intercomparison |
