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München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 59: Structure and Dynamics of Nuclei XI

HK 59.4: Talk

Friday, March 22, 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. Zidarova21Technische 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 21,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 21,ms+ state, due to a mechanism called shell-stabilization. This situation changes at 138Ce, where at the π(g7/2) sub-shell closure at Z = 58 the lack of shell-stabilization causes the fragmentation of the 21,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 21,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.

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