Abstract.
For the N = 50-56 zirconium (Z = 40) and molybdenum (Z = 42) isotopes, the evolution of subshells is evaluated by extracting the effective single-particle energies from available particle-transfer data. The extracted systematic evolution of neutron subshells and the systematics of the excitation energy of the octupole phonons provide evidence for type-II shape coexistence in the Zr isotopes. Employing a simplistic approach, the relative effective single-particle energies are used to estimate whether the formation of low-lying octupole-isovector excitations is possible at the proposed energies. The results raise doubts about this assignment.
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Communicated by N. Kalantar-Nayestanaki
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Gregor, E.T., Scheck, M., Chapman, R. et al. Shell evolution of stable N = 50-56 Zr and Mo nuclei with respect to low-lying octupole excitations. Eur. Phys. J. A 53, 50 (2017). https://doi.org/10.1140/epja/i2017-12224-7
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DOI: https://doi.org/10.1140/epja/i2017-12224-7