München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 59: Structure and Dynamics of Nuclei XI
HK 59.5: Talk
Friday, March 22, 2019, 15:15–15:30, HS 14
E2 strength of the scissors mode and F-vector quadrupole charges over a shape-phase transition⋆ — •T. Beck1, N. Cooper2,3, U. Gayer1, FNU Krishichayan4, O. Papst1, N. Pietralla1, D. Savran5, W. Tornow4, and V. Werner1 — 1IKP, TU Darmstadt — 2Yale University, New Haven, CT, USA — 3University of Notre Dame, Notre Dame, IN, USA — 4Duke University, Durham, NC, USA — 5GSI, Darmstadt
The properties of the nuclear scissors mode provide an essential insight into the nature of the restoring forces between the proton and neutron subsystems.
Especially the behavior at the quantum phase transition (QPT) from spherical to quadrupole-deformed nuclear shape is of interest due to the quadrupole-collective origin of the scissors mode.
Recently, the first measurement [1] of an F-vector E2 transition in axially deformed nuclei yielded direct information on the magnitude of the quadrupole boson charges for deformed nuclei in the framework of the Interacting Boson Model-2 [2].
New data on 154Gd and 162,164Dy corroborate and extend the work on the evolution of F-scalar and F-vector quadrupole boson charges over the QPT.
The obtained results will be presented in detail and discussed in terms of the underlying nuclear physics.
An outlook to future research will be given.
T. Beck et al., Phys. Rev. Lett. 118, 212502 (2017).
T. Otsuka and J.N. Ginocchio, Phys. Rev. Lett. 54, 777 (1985).
⋆This work was supported by the DFG under Grant No. SFB 1245 and U.S. DOE under Grant No. DE-FG02-91ER40609.