459 research outputs found
Production of exotic isotopes in complete fusion reactions with radioactive beams
The isotopic dependence of the complete fusion (capture) cross section is
analyzed in the reactions
Xe+Ca with stable and
radioactive beams. It is shown for the first time that the very neutron-rich
nuclei W can be reached with relatively large cross sections by
complete fusion reactions with radioactive ion beams at incident energies near
the Coulomb barrier. A comparison between the complete fusion and fragmentation
reactions for the production of neutron-rich W and neutron-deficient Rn
isotopes is performed.Comment: 13 pages, 6 figures, accepted in PR
Pauli-Villars Regularization in nonperturbative Hamiltonian approach on the Light Front
The advantage of Pauli-Villars regularization in quantum field theory
quantized on the light front is explained. Simple examples of scalar
field theory and Yukawa-type model are used. We give also an
example of nonperturbative calculation in the theory with Pauli-Villars fields,
using for that a model of anharmonic oscillator modified by inclusion of ghost
variables playing the role similar to Pauli-Villars fields.Comment: LaTeX, 10 pages, 2 figures. Article will be published in AIP
Conference Proceedings, the final publication will be available at
http://scitation.aip.org/content/aip/proceeding/aipc
An ab initio theory of double odd-even mass differences in nuclei
Two aspects of the problem of evaluating double odd-even mass differences D_2
in semi-magic nuclei are studied related to existence of two components with
different properties, a superfluid nuclear subsystem and a non-superfluid one.
For the superfluid subsystem, the difference D_2 is approximately equal to
2\Delta, the gap \Delta being the solution of the gap equation. For the
non-superfluid subsystem, D_2 is found by solving the equation for two-particle
Green function for normal systems. Both equations under consideration contain
the same effective pairing interaction. For the latter, the semi-microscopic
model is used in which the main term calculated from the first principles is
supplemented with a small phenomenological addendum containing one
phenomenological parameter supposed to be universal for all medium and heavy
atomic nuclei.Comment: 7 pages, 10 figures, Report at Nuclear Structure and Related Topics,
Dubna, Russia, July 2 - July 7, 201
The first quadrupole excitations in spherical nuclei and nuclear pairing
Excitation energies and transition probabilities of the first 2+ excitations
in even lead, tin and nickel isotopes are calculated within the self-consistent
Theory of Finite Fermi Systems based on the Energy Density Functional by Fayans
et al. A reasonable agreement with available experimental data is obtained. The
effect of the density dependence of the effective pairing interaction is
analyzed in detail by comparing results obtained with volume and surface
pairing. The effect is found to be noticeable, especially for the 2+ energies
which are systematically higher at 200-300 keV for the volume paring as
compared with the surface pairing case, the latter being in a better agreement
with the data.Comment: Presented at International Conference on Nuclear Structure and
Related Topics, Dubna, July 2 - 7, 201
Description of a new species of Chrysina Kirby, 1828 (Coleoptera: Scarabaeidae: Rutelinae) from resplendens group, based on morphological characters and mtDNA COX I molecular marker
A new species of the genus Chrysina Kirby, 1828 is decribed from Panama. Chrysina kalinini sp.n. is related to Chrysina resplendens (Boucard, 1875) in habitus, male genitalia morphology and mtDNA COX I molecular marker). The two closely related species differ in the shape of pronotum, mesosternal process and male genitalia. mtDNA COI molecular marker analysis gives a reliable distance for the compared species
Effect of friction deformation on the structure and properties of a metastable austenitic chromium-nickel steel
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