Speaker
Alfred Dewald
(Institut für Kernphysik, Universität zu Köln)
Description
Aside from energy spectra absolute electromagnetic transition probabilities are important observables for the investigation of nuclear structure. With the advent of radioactive beam experiments as well as experiments employing specific nuclear reactions by which nuclei far from the valley of stability can be investigated with the methods of gamma ray spectroscopy, e.g. deep-inelastic reactions, nuclear structure investigations of exotic nuclei became possible. Consequently efforts are made to adapt the experimental techniques which were successfully used in the past for less exotic nuclei to the needs of the new type of experiments. This applies also for the Recoil Distance Doppler Shift Method, also called plunger method which is well suited to measure level lifetimes in a direct manner. So far this method has been successfully applied after Coulomb excitation and particle transfer reactions at energies of 50-100 MeV/u. Also deep inelastic reactions have been used to perform plunger experiments. Each of the different reactions put specific demands on targets and plunger devices used as well as on the data analysis.
In this contribution the status of actually used plunger techniques will be presented. In order to demonstrate what can be achieved by the plunger technique some recent results will be presented. In addition ongoing developments will be described.
Primary author
Alfred Dewald
(Institut für Kernphysik, Universität zu Köln)
