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Dudek, Gabriela; Borys, Przemysław

doi:10.5506/aphyspolb.42.1837

“…The excitation energy E x is predicted to be 1.1 MeV by the Hartree-Fock-Bogoliubov (HFB) calculation [2]. The spin J of a possible band head is expected to be 3 [2], and the spin of the isomeric state might be larger than that of the band head [26]. These expectations are consistent with the experimental indications, i.e.…”

supporting

confidence: 75%

“…The tetrahedral shape is a non-axial octupole deformation coupled with a vanishingly small quadrupole deformation, therefore a γ decay to normally quadrupole-deformed states is hindered [8]. The tetrahedral shape will appear only when the competing shell effect for spherical shape is weak [26]. This requirement might be satisfied because the 108 Zr results indicate the deformed ground state.…”

mentioning

confidence: 99%

Structural Evolution in the Neutron-Rich NucleiZr106andZr108

Sumikama¹,

Yoshinaga²,

Watanabe³

et al. 2011

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The low-lying states in 106 Zr and 108 Zr have been investigated by means of β-γ and isomer spectroscopy at the RI beam factory, respectively. A new isomer with a half-life of 620 ± 150 ns has been identified in 108 Zr. 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 108 Zr indicates that a spherical sub-shell gap predicted at N = 70 is not large enough to change the ground state of 108 Zr to the spherical shape. The possibility of a tetrahedral shape isomer in 108 Zr is also discussed.

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“…The excitation energy E x is predicted to be 1.1 MeV by the Hartree-Fock-Bogoliubov (HFB) calculation [2]. The spin J of a possible band head is expected to be 3 [2], and the spin of the isomeric state might be larger than that of the band head [26]. These expectations are consistent with the experimental indications, i.e.…”

supporting

confidence: 55%

Structural evolution in the neutron-rich nuclei 106Zr and 108Zr

Sumikama,

Yoshinaga,

Watanabe

et al. 2011

Preprint

0

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The low-lying states in 106 Zr and 108 Zr have been investigated by means of β-γ and isomer spectroscopy at the RI beam factory, respectively. A new isomer with a half-life of 620 ± 150 ns has been identified in 108 Zr. 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 108 Zr indicates that a spherical sub-shell gap predicted at N = 70 is not large enough to change the ground state of 108 Zr to the spherical shape. The possibility of a tetrahedral shape isomer in 108 Zr is also discussed.

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“…Non-axially symmetric shapes such as octahedral (stabilized by six Z∼20, A∼48 clusters) or tetrahedral (stabilized by four Z = 28 clusters) could result in enhanced SHE stability, and correspondingly reduced mass. Some plots of these octahedral and tetrahedral deformations [21] are presented in Fig. 6.…”

Section: Uncertainties In a Assignmentsmentioning

confidence: 99%

How good are superheavy elementZandAassignments?

Gregorich

¹

2016

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Proton number, Z, and mass number,A, assignments for newly discovered heavy element nuclides have historically been made by observing decay to a daughter with well-established Z and A, and then observing the well-know decay of that daughter. For all of the new superheavy element isotopes observed in 48 Ca irradiations of actinide targets, this correlation technique has not been possible, because the -decay chains end in spontaneous fission of previously unknown isotopes. Consequently, Z and A assignments have been made by less-direct means. The superheavy element Z and A assignment methods are summarized, and possibilities for how they may be incorrect are explored. While it is highly likely that most of the superheavy element Z and A assignments are correct, there is a real need for a direct proof. How SHE Z and A assignments have been madeFor the SHE isotopes produced in 48 Ca irradiation of actinide targets, and all of the daughter isotopes resulting from successive -decays, experimenters have resorted to lessdirect means of Z and A assignment. These less-direct means are excitation functions, cross bombardments, and decay systematics. a

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Cited by 4 publications

References 13 publications

Structural Evolution in the Neutron-Rich NucleiZr106andZr108

Structural Evolution in the Neutron-Rich NucleiZr106andZr108

Structural evolution in the neutron-rich nuclei 106Zr and 108Zr

How good are superheavy elementZandAassignments?

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