Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2011-04-15
Phys.Rev.Lett.106:202501,2011
Physics
Nuclear Physics
Nuclear Experiment
10 pages, 3 figures, Accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.106.202501
The low-lying states in 106Zr and 108Zr have been investigated by means of {\beta}-{\gamma} and isomer spectroscopy at the RI beam factory, respectively. A new isomer with a half-life of 620\pm150 ns has been identified in 108Zr. For the sequence of even-even Zr isotopes, the excitation energies of the first 2+ states reach a minimum at N = 64 and gradually increase as the neutron number increases up to N = 68, suggesting a deformed sub-shell closure at N = 64. The deformed ground state of 108Zr indicates that a spherical sub-shell gap predicted at N = 70 is not large enough to change the ground state of 108Zr to the spherical shape. The possibility of a tetrahedral shape isomer in 108Zr is also discussed.
Baba Hideshi
Berryman J. S.
Blasi N.
Bracco Andrea
Camera Franco
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