Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Structure and Dynamics of Nuclei II
HK 10.2: Vortrag
Montag, 26. Februar 2018, 17:00–17:15, HZO 70
Lifetime measurements in neutron-rich Ce isotopes — •Guillermo Fernández Martínez, Stoyanka Ilieva, and Thorsten Kröll for the FATIMA-GS collaboration — Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt
The structural evolution of neutron-rich Ce isotopes (Z=58) can be better understood through the knowledge of their low-lying states’ lifetimes. The data presented here originate from an experimental campaign carried out at the Argonne National Laboratory (ANL) at the turn of the year 2015/2016, that aimed for the direct measurement of lifetimes of excited states in the 252Cf spontaneous fission products. The combined usage of one hemisphere of the Gammasphere, consisting of 51 high-resolution HPGe detectors, and an array of 25 ultra-fast LaBr3(Ce) scintillators from the NuSTAR-FATIMA collaboration, allowed the collection of coincident γ-rays for a period of 30 days. The selection of the Ce isotopes of interest was ensured by posing the necessary amount of energy gates in the HPGe detectors on their characteristic transitions, while the lifetimes in the region from some nanoseconds down to few tens of picoseconds were obtained from the time response of the LaBr3(Ce) detectors, applying the Generalized Centroid Difference method. In the present work, first results for the lifetimes of the low-lying excited states of 146−150Ce will be shown. This work is supported by the German BMBF under grant no. 05P12RDNUP (NuPNET), the FATIMA collaboration, the TU-GSI cooperation contract and HIC for FAIR.