1,705 research outputs found
Nuclear interactions with modern three-body forces lead to the instability of neutron matter and neutron stars
It is shown that the neutron matter interacting through Argonne V18
pair-potential plus modern variants of Urbana or Illinois three-body forces is
unstable. For the energy of neutrons , which interact through these
forces, we prove mathematically that ,
where is a constant. This means that: (i) the energy per particle and
neutron density diverge rapidly for large neutron numbers; (ii) bound states of
neutrons exist for large enough. The neutron matter collapse is
possible due to the form of the repulsive core in three-body forces, which
vanishes when three nucleons occupy the same site in space. The old variant of
the forces Urbana VI, where the phenomenological repulsive core does not vanish
at the origin, resolves this problem. We prove that to prevent the collapse one
should add a repulsive term to the Urbana IX potential, which should be larger
than 50 MeV when 3 nucleons occupy the same spatial position
Nuclear Model of Binding alpha-particles
The model of binding alpha-particles in nuclei is suggested. It is shown good
(with the accuracy of 1-2%) description of the experimental binding energies in
light and medium nuclear systems. Our preliminary calculations show enhancement
of the binding energy for super heavy nuclei with Z~120.Comment: 4 pages, 2 figures, Will be puplished in World Scientific as Procs.
Int. Symposium on Exotic Nuclei, "EXON - 2004", July 5 - 12, 2004, Peterhof,
Russi
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