Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 32: Struktur und Dynamik von Kernen
HK 32.4: Vortrag
Dienstag, 5. März 2013, 15:00–15:15, HSZ-401
Evolution of Deformation in neutron-rich Cr-Isoptopes — •Thomas Braunroth — Institut für Kernphysik, Universität zu Köln
The emerging new region of deformation around the N=40 subshell closure is one of many observable effects in nuclei at extreme isospin conditions. Although level schemes in neutron-rich Cr-isotopes suggest an increase in collectivity, the experimental data are sparse and motivate further experimental efforts to shed more light on the evolution of deformation in this region of the nuclear landscape. For this purpose lifetime measurements on 58,60,62Cr with a dedicated differential plunger device were performed at the NSCL to deduce model-independent B(E2)-values. A 82Se beam at 140 MeV/u was fragmented on a primary 9Be target. The corresponding cocktail beam was filtered in the A1900 fragment separator, which then delivered the high purity 59,61,63Mn-beams at E∼ 95 AMeV to the secondary target. Low lying yrast states in the above mentioned Cr-isotopes were then populated in 1p-knockout reactions. The employment of the S800 spectrograph allowed a clear recoil identification, which then lead to clean γ-spectra as measured by the Segmented Germanium Array (SeGA). Preliminary results of this experiment will be shown.