Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 5: Structure and Dynamics of Nuclei I
HK 5.6: Vortrag
Montag, 14. März 2016, 15:30–15:45, S1/01 A03
Spectroscopy in neutron-rich nuclei in the vicinitiy of N=40 — •Thomas Braunroth1, Alfred Dewald1, Christoph Fransen1, Hironori Iwasaki2, Jan Jolie1, and Julia Litzinger1 — 1Institut für Kernphysik, Universität zu Köln, Germany — 2National Superconducting Cyclotron Laboratory, MSU, USA
The development of collectivity towards N=40 in neutron-rich nuclei between 20Ca and 28Ni shows a distinct Z-dependence. While 68Ni exhibits features of a pronounced shell-gap, the evolution of key observables, e.g. excitation energies and B(E2) values, in even-even 26Fe and 24Cr isotopes is interpreted as a rapidly evolving quadrupole deformation when N=40 is approached. However, experimental information on level energies and reduced transitions strengths are still sparse in this particular region of the nuclear landscape. To shed more light on the evolution of collectivity along even-even Cr isotopes towards N=40, we performed an experiment at NSCL, MSU (USA) in which lifetimes of excited states were measured with the recoil distance Doppler-shift technique. The experiment focused on the 21+ and 41+ states in 58,60,62Cr and corresponding results have been published recently [1]. In addition, various excited states in neighbouring nuclei with 23 ≲ Z ≲ 26 close to N=40 were populated and some spectroscopic information on transition energies and level lifetimes can be deduced. Some of them are determined for the first time. In this talk we will present preliminary results of such side reactions. This work is supported by the BMBF under contract number 05P12PKFNE.
[1] T. Braunroth et al., Phys. Rev. C 92, 034306 (2015)