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Within the improved quantum molecular dynamics (ImQMD) model we follow the evolution of nuclear matter for planar Couette flow in a periodic box. We focus on the region of liquid-gas phase transition and extract the shear viscosity coefficient from the local stress tensor, directly following the viscosity definition. Here, by switching on and off the mean field and thus inducing the phase transition, we are able to observe the impact of clumping in the phase transition region on the viscosity.

Tmore » he invariant-mass distribution of ${}_{11}\mathrm{O}$ fragments formed in two-neutron-knockout reactions with a ${}_{13}\mathrm{O}$ projectile and ${}_9\mathrm{Be}$ target has been also examined. Gating on events where the ${}_9\mathrm{C}$ decay fragments produced following $2p$ emission are recoiled transversely in the projectile's frame improves the overall invariant-mass resolution. he observed peak is now shown to have contributions from at least two ${}_{11}\mathrm{O}$ levels, in contradiction with the suggestion of Fortune [Phys. Rev. C 99, 051302(R) (2019)]. he data, yet, do not differentiate between the ground-state properties obtained by the Gamow coupled-channels calculation and the prompt $2p$-decay model of Fortune. he ground-state $2p$-decay energy is 4.25(6) MeV in a two-level fit to the data, but lower values are possible if more states contribute to the observed spectrum, as suggested in the previous analysis.« less