1,518 research outputs found
Neutrinoânucleus reactions and nuclear structure
The methods used in the evaluation of the neutrinoânucleus cross section are reviewed. Results are shown for a variety of targets of practical importance. Many of the described reactions are accessible in future experiments with neutrino sources from the pion and muon decays at rest, which might be available at the neutron spallation facilities. Detailed comparison between the experimental and theoretical results would establish benchmarks needed for verification and/or parameter adjustment of the nuclear models. Having a reliable tool for such calculation is of great importance in a variety of applications, e.g. the neutrino oscillation studies, detection of supernova neutrinos, description of the neutrino transport in supernovae and description of the r-process nucleosynthesis
Supernova Inelastic Neutrino-Nucleus Cross Sections from High-Resolution Electron Scattering Experiments and Shell-Model Calculations
Highly precise data on the magnetic dipole strength distributions from the
Darmstadt electron linear accelerator for the nuclei 50Ti, 52Cr and 54Fe are
dominated by isovector Gamow-Teller-like contributions and can therefore be
translated into inelastic total and differential neutral-current
neutrino-nucleus cross sections at supernova neutrino energies. The results
agree well with large-scale shell-model calculations, validating this model.Comment: 5 pages, 4 figures, RevTeX 4, version accepted in Phys. Rev. Letter
Coulomb displacement energies, energy differenced and neutron skins
A Fock space representation of the monopole part of the Coulomb potential is
presented. Quantum effects show through a small orbital term in . Once
it is averaged out, the classical electrostatic energy emerges as an
essentially exact expression, which makes it possible to eliminate the
Nolen-Schiffer anomaly, and to estimate neutron skins and the evolution of
radii along yrast states of mirror nuclei. The energy differences of the latter
are quantitatively reproduced by the monopole term and a schematic multipole
one.Comment: 4 pages, 3 figures, Revte
On the Design and Development of Object-oriented Scheduling Systems
In this paper, we describe the architecture of an object-oriented scheduling system. First,
a mathematical framework is presented that is based on set theory and graph theory. Then
a number of basic as well as more specialized methods are defined which can be applied
on the entities of any decision support system. The principal objects of a scheduling system
are defined, as well as the methods specifically designed for the manipulation of the schedules.
The object base design, the schedule generator design and the user interface design are
then discussed in detail.Information Systems Working Papers Serie
Nonlocal modification of the Kerr metric
In the present paper, we discuss a nonlocal modification of the Kerr metric.
Our starting point is the Kerr-Schild form of the Kerr metric
. Using Newman's approach we
identify a shear free null congruence with the generators of
the null cone with apex at a point in the complex space. The Kerr metric is
obtained if the potential is chosen to be a solution of the flat Laplace
equation for a point source at the apex . To construct the nonlocal
modification of the Kerr metric we modify the Laplace operator by
its nonlocal version . We found the potential
in such an infinite derivative (nonlocal) model and used it to construct
the sought-for nonlocal modification of the Kerr metric. The properties of the
rotating black holes in this model are discussed. In particular, we derived and
numerically solved the equation for a shift of the position of the event
horizon due to nonlocality.Comment: 14 pages, 9 figure
Backbending in 50Cr
The collective yrast band and the high spin states of the nucleus 50Cr are
studied using the spherical shell model and the HFB method. The two
descriptions lead to nearly the same values for the relevant observables. A
first backbending is predicted at I=10\hbar corresponding to a collective to
non-collective transition. At I=16\hbar a second backbending occurs, associated
to a configuration change that can also be interpreted as an spherical to
triaxial transition.Comment: ReVTeX v 3.0 epsf.sty, 5 pages, 5 figures included. Full Postscript
version available at http://www.ft.uam.es/~gabriel/Cr50art.ps.g
- âŠ