Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Structure and Dynamics of Nuclei X

HK 51.5: Vortrag

Donnerstag, 17. März 2016, 15:00–15:15, S1/01 A03

Mixed-symmetry states and shape coexistence in N=52-56 Mo isotopes — •V. Werner^1,2, T. Thomas^2,3, J. Jolie³, K. Nomura^4,5, T. Ahn^2,6, N. Cooper², H. Duckwitz³, A. Fitzler³, C. Fransen³, A. Gade^3,7, M. Hinton², G. Ilie², K. Jessen^3,8, A. Linnemann³, P. Petkov^3,9, N. Pietralla¹, and D. Radeck^3,10 — ¹IKP, TU Darmstadt — ²WNSL, Yale U — ³IKP, U Köln — ⁴GANIL — ⁵U Zagreb — ⁶U Notre Dame — ⁷NSCL, Michigan State U — ⁸LMU München — ⁹Bulg. Acad. Sci., Sofia — ¹⁰PTB Braunschweig

Angular correlation experiments have been performed on ⁹⁶Mo and ⁹⁸Mo [1] at the IKP, Universität zu Köln, and at WNSL, Yale University. Lifetimes of excited states have been determined from line shape analyses. The extensive data set, compared to IBM-2 configuration mixing calculations based on microscopic EDFs, reveals the occurrence of coexistence of near-spherical and deformed configurations in both Mo isotopes. Furthermore, the main fragments of one-phonon mixed-symmetry 2⁺ states have been identified. The systematic of their decay behavior in the Mo chain from N=52 to 56, namely the crossing of the strongest M1 decay branch to the first and second 2⁺ states as a function of neutron number, suggests a new signature for shape coexistence. Supported through U.S. DOE Grant No. DE-FG02-91ER-40609 and DFG grant SFB 634.

[1] T. Thomas et al., Phys. Rev. C 88, 044305 (2013).