3,526 research outputs found
Comment on `Two-body random ensembles: from nuclear spectra to random polynomials
In PRL 85, 3773 (2000) it was suggested to use random polynomials to analyze
and understand the properties of two-body random ensembles. In this comment we
point out that for the vibron model the random polynomial is not quadratic, but
has a more general form. We make a comparison for the percentage of ground
states with L=0 in the vibron model with random interactions.Comment: 2 pages, 1 figure, Phys. Rev. Lett., in pres
The structure of rotational bands in alpha-cluster nuclei
In this contribution, I discuss an algebraic treatment of alpha-cluster
nuclei based on the introduction of a spectrum generating algebra for the
relative motion of the alpha-clusters. Particular attention is paid to the
discrete symmetry of the geometric arrangement of the alpha-particles, and the
consequences for the structure of the rotational bands in the 12C and 16O
nuclei.Comment: 3 pages, 3 figures, invited talk, CGS15, Dresden, August 25-29, 201
Flavor content of nucleon form factors in a VMD approach
The strange form factors of the nucleon are studied in a two-component model
consisting of a three-quark intrinsic structure surrounded by a meson cloud. A
comparison with the available experimental world data from the SAMPLE, PVA4,
HAPPEX and G0 collaborations shows a good overall agreement. It is shown that
the strangeness contribution to the electric and magnetic form factors is of
the order of a few percent. In particular, the strange quark contribution to
the charge radius is small (0.005 fm**2) and to the magnetic moment it is
positive (0.315 n.m.).Comment: 5 pages, 6 figures, 1 table, invited talk at PAVI06, Milos, Greece,
May 16-20, 200
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