München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 59: Structure and Dynamics of Nuclei XI

HK 59.4: Vortrag

Freitag, 22. März 2019, 15:00–15:15, HS 14

Projectile Coulomb Excitation of Radioactive ¹⁴⁰Nd at HIE-ISOLDE — •R. Kern¹, R. Stegmann¹, G. Rainovski², N. Pietralla¹, L. Gaffney³, A. Blazhev⁴, K. Gladnishki², J. Jolie⁴, V. Karayonchev⁴, T. Kröll¹, P. Reiter⁴, P.-A. Söderström¹, M. Scheck⁵, P. Spagnoletti⁵, A. Vogt⁴, N. Warr⁴, A. Welker³, V. Werner¹, J. Wiederhold¹, and R. Zidarova² — ¹Technische Universität Darmstadt — ²University of Sofia — ³CERN — ⁴Universität zu Köln — ⁵University of the West of Scotland

Projectile Coulomb excitation (CoulEx) is a powerful tool for investigating valence-shell excitations of unstable nuclei. The full-symmetry 2₁⁺ state and the so-called mixed-symmetry 2_1,ms⁺ state are the two fundamental quadrupole-collective valence-shell excitations of near-spherical nuclei. They can be understood as a mixture of the collective 2⁺ proton and 2⁺ neutron excitations. Near-spherical even-even N = 80 isotones with 50 < Z < 58 exhibit an isolated 2_1,ms⁺ state, due to a mechanism called shell-stabilization. This situation changes at ¹³⁸Ce, where at the π(g_7/2) sub-shell closure at Z = 58 the lack of shell-stabilization causes the fragmentation of the 2_1,ms⁺ state. It is of great interest, whether the shell stabilization reoccurs in the N = 80 isotones for Z > 58, i.e. ¹⁴⁰Nd (Z = 60). To answer this question, a CoulEx experiment was performed to identify the 2_1,ms⁺ state of ¹⁴⁰Nd at the radioactive ion beam facility ISOLDE at CERN using MINIBALL. Preliminary results from the experiment will be shown.
Supported by the BMBF under Grant No. 05P15(/18)RDCIA.