Seminarium Fizyki Jądra Atomowego

Nuclear state lifetimes are an important observable to assess nuclear structure and probe nuclear theories. Since these lifetimes range over several orders of magnitude many techniques have been developed to measure them. In particular short lifetimes, in the range below one picosecond, are sometimes difficult to be measured and only a view techniques are available. Amongst them the Gamma Ray Induced Doppler broadening technique is well established. However, it is based on the availability of the ultra high resolution gamma ray spectrometers GAMS, which are in standby mode until 2024. We tried to transfer the main measurement principles of the GRID technique to a Germanium array like FIPPS by proposing the Gamma Ray Induced Doppler Shift Attenuation technique. Demonstration measurements were done and the results look quite promising. It will be shown how lifetime measurements up to 500 fs are possible without any modification of the experimental setup. Further it will be discussed how this technique could be extended towards lifetimes in the picosecond range.