Speaker
Dr
Piotr Bednarczyk
(IFJ PAN, Krakow)
Description
Great progress in understanding of both individual excitations of nucleons and collective phenomena has been made possible by use of germanium multi-detector arrays. However, the still new information on those excitations is often hard to reach for heavy nuclei (A>200) due to a strong background caused by fission. An observation of properties of such nuclei populated in heavy ion induced fusion-evaporation reactions with only of a few microbarns cross-section can be possible when filtering by detecting the recoiled nuclei after particle evaporation. A considerable improvement of a selectivity can be achieved when gamma-rays are detected in coincidence with those evaporation residues.
The coincidence condition allows to suppress gamma-rays from competing fission and, moreover, from transfer processes, Coulomb excitation, target contaminations, etc. For lighter fast recoiling evaporation-residues the determination of the velocity vector of recoils in event-by-event mode allows for significant Doppler broadening reduction which can lead to considerable improvement in the gamma energy resolution, especially when high energy gamma-rays are emitted.
The Recoil Filter Detector (RFD) measures evaporation residues in coincidence with gamma-rays detected in a germanium array. It was used in several experiments as an ancillary detector for EUROBALL and GASP.
At present, an application of the RFD at GALILEO is proposed.
In the talk will be given an overview of the RFD, it’s so far performance in-beam and the new application at the GALILEO setup. A perspective of using the RFD in studies of heavy evaporation residues produced with radioactive beams at very high spins will be also discussed.
Primary author
Dr
Piotr Bednarczyk
(IFJ PAN, Krakow)
