Quantum Phase Transition in the Shape of Zr isotopes.

@article{Togashi2016QuantumPT,
  title={Quantum Phase Transition in the Shape of Zr isotopes.},
  author={Tomoaki Togashi and Yusuke Tsunoda and Takaharu Otsuka and Noritaka Shimizu},
  journal={Physical review letters},
  year={2016},
  volume={117 17},
  pages={
          172502
        }
}
The rapid shape change in Zr isotopes near neutron number N=60 is identified to be caused by type II shell evolution associated with massive proton excitations to its 0g_{9/2} orbit, and is shown to be a quantum phase transition. Monte Carlo shell-model calculations are carried out for Zr isotopes of N=50-70 with many configurations spanned by eight proton orbits and eight neutron orbits. Energy levels and B(E2) values are obtained within a single framework in good agreement with experiment… CONTINUE READING

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