München 2019 – wissenschaftliches Programm
HK 54.25: Poster
Donnerstag, 21. März 2019, 16:30–19:00, Foyer Theresanium
Fast-Timing lifetime measurement of 150Gd — •J. Wiederhold1, N. Pietralla1, V. Werner1, W. Witt1,2, E. Aciksöz1, N. Marginean3, D. G. Ghita3, R. Marginean3, C. R. Nita3, R. Lica3, N. Florea3, S. Pascu3, D. Bucurescu3, D. M. Filipescu3, C. Mihai3, and R. Mihai3 — 1Institut für Kernphysik, TU-Darmstadt, Deutschland — 2GSI, Darmstadt, Deutschland — 3IFIN-HH, Bucharest, Rumänien
The region of the nuclear chart around the neutron number N=90 is an example for a rapid change of structure
as a function of nucleon number, i.e. shape-phase transition from spherical to quadrupole-deformed nuclei. Several observables, e.g. ρ2(E0;0gs+→02+)
are promising signatures for a quantum phase transition. The aim of the experiment was to determine the mean lifetime of the first-excited 0+
state of 150Gd and other lifetimes in the ps - ns range.
Excited states of 150Gd were populated using the 147Sm(α,n)150Gd fusion-evaporation reaction. The ions were produced at the IFIN-HH in Bucharest, Magurele, and accelerated with the 9 MV FN-Tandem accelerator to a beam energy of 17.5 MeV. De-excitation γ rays were detected with the RoSphere detector array in a configuration with 14 HPGe detectors and 11 LaBr3:Ce detectors for fast-timing applications. This work was supported by the DFG under the grants SFB 634 and SFB 1245 and the BMBF under the grant 05P15RDFN1 within the collaboration 05P15 NuSTAR R&D and 05P15(18)RDFN9.