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HK: Fachverband Physik der Hadronen und Kerne
HK 37: Structure and Dynamics of Nuclei VII
HK 37.3: Vortrag
Mittwoch, 1. April 2020, 17:15–17:30, J-HS E
Lifetime of the 41+ state in 212Po using the fast timng technique — •Martin von Tresckow for the IFIN-HH-212Po collaboration — TU Darmstadt
The isotope 212Po has two protons and neutrons more than the doubly magical nucleus 208Pb and it can anticipated that this nucleus can be well described by the nuclear shell-model. However, experimental lifetimes of excited states don’t agree well with predictions from the shell model. The nucleus has rather a mixture between shell-model and cluster configurations. The B(E2) value of the 41+ state is an important puzzle piece to solve the question about the structure of 212Po but previous attempts to measure this value had very large errors which did not allow for any conclusion.
In November 2019, we performed an experiment at the Tandem accelerator of IFIN-HH in Magurele, Romania, to determine the lifetime applying the fast timing technique. We used the α transfer between a 10B beam and a 208Pb target to investigate the unstable isotope 212Po. The γ-rays were detected by ROSPHERE consisting of 15 Ge CLOVER detectors, 10 LaBr3(Ce) detectors and 6 solar cell detectors at backward angles to measure the beam like products.
For the fast timing technique applying the centroid shift method, the precise determination of prompt time response is crucial. A novel method has been tested in this experiment to determine the time response at low energies using the internal activity of the LaBr3(Ce) crystals. This method will be presented, as well as preliminary results from the data analysis.