13,695 research outputs found
Phenomenological High Precision Neutron-Proton Delta-Shell Potential
We provide a successful fit for proton-neutron scattering below pion
production threshold up to LAB energies of 350 MeV. We use seven high-quality
fits based on potentials with different forms as a measure of the systematic
uncertainty. We represent the interaction as a sum of delta-shells in
configuration space below the 3fm and a charge dependent one pion exchange
potential above 3fm together with magnetic and vacuum polarization effects.
Special attention is paid to estimate the errors of the phenomenological
interaction.Comment: 5 pages, 2 figures. Comments and one figure with differential
observables adde
Equilibrium of stellar dynamical systems in the context of the Vlasov-Poisson model
This short review is devoted to the problem of the equilibrium of stellar
dynamical systems in the context of the Vlasov-Poisson model. In a first part
we will review some classical problems posed by the application of the
Vlasov-Poisson model to the astrophysical systems like globular clusters or
galaxies. In a second part we will recall some recent numerical results which
may give us some some quantitative hints about the equilibrium state associated
to those systems.Comment: 8 pages, no figures, accepted in Communications in Nonlinear Science
and Numerical Simulatio
Bootstrapping the statistical uncertainties of NN scattering data
We use the Monte Carlo bootstrap as a method to simulate pp and np scattering
data below pion production threshold from an initial set of over 6700
experimental mutually consistent data. We compare the results of the
bootstrap, with 1020 statistically generated samples of the full database, with
the standard covariance matrix method of error propagation. No significant
differences in scattering observables and phase shifts are found. This suggests
alternative strategies for propagating errors of nuclear forces in nuclear
structure calculations.Comment: 5 pages, 3 figure
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