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V. N. Tarasov K. A. Gridnev W. Greiner D. K. Gridnev V. I. Kuprikov D. V. Tarasov X. Viñas 《Physics of Atomic Nuclei》2012,75(1):17-26
On the basis of the Hartree-Fock method as implemented with Skyrme forces (Ska, SkM*, Sly4, and SkI2) and with allowance for an axial deformation and nucleon pairing in the Bardeen-Cooper-Schrieffer approximation, the properties
of extremely neutron-rich even-even nuclei were calculated beyond the neutron drip line known earlier from theoretical calculations.
It was shown that the chains of isotopes beyond the neutron drip line that contain N = 32, 58, 82, 126, and 184 neutrons form peninsulas of nuclei stable against the emission of one neutron and, in some cases,
peninsulas of nuclei stable against the emission of two neutrons. The neutron- and proton-density distributions in nuclei
forming stability peninsulas were found to be spherically symmetric. A mechanism via which the stability of nuclei might be
restored beyond the neutron drip line was discussed. A comparison with the results of calculations by the Hartree-Fock-Bogolyubov
method was performed for long chains of sulfur and gadolinium isotopes up to the neutron drip line. 相似文献
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Within the nuclear-matter approximation, the local-density approximation, and perturbation theory, an approach to constructing a microscopic nucleon-nucleus optical potential at finite nuclear temperatures is developed on the basis of effective density-dependent nucleon-nucleon forces. The real and the imaginary part of the neutron-nucleus optical potential and the mean free paths of neutrons in nuclear matter are calculated at various neutron energies and various nuclear temperatures. The effect of the inclusion of the rearrangement potential on the quantities under consideration is studied, and its importance is demonstrated. 相似文献
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V. N. Tarasov D. V. Tarasov K. A. Gridnev D. K. Gridnev W. Greiner V. G. Kartavenko V. I. Kuprikov 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(6):842-846
The properties of neutron-rich Zr isotopes up to the neutron drip line and beyond it have been investigated on the basis of the Hartree-Fock method with the Skyrme forces (Ska, Sly4), taking into account the deformation. By the example of chains of Zr isotopes, good agreement is shown for the two-neutron separation energies and mean-square radii with the known results of Hartree-Fock-Bogolyubov calculations with the Sly4 forces. For the extremely neutron-rich Zr isotopes, states with very large deformation parameters (β ≈ 0.4?0.45) of neutron and proton density distributions can be realized. Beyond the neutron drip line with respect to emission of two neutrons, the existence of 150,152Zr isotopes, which are stable with respect to one-neutron emission, is predicted. 相似文献