5 research outputs found
EFFECT OF THE CASIMIR ENERGY ON THE BAG MODEL PHENOMENOLOGY OF LIGHT HADRONS
The dependence of light hadron masses and baryon magnetic moments on the magnitude of the Casimir energy is examined in the bag model with centre-of-mass corrections. There are seven free parameters in the model. Six of them are determined from the fit to the masses of certain hadrons, and the last one (Casimir energy parameter) from the best fit to the magnetic moments of light baryons. The predicted magnetic moments are compared with the results obtained in various other models and with experiment data
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Modelling of decay heat removal from CONSTOR RBMK-1500 casks during long-term storage of spent nuclear fuel
Management of spent nuclear fuel is a very important part in the whole cycle of nuclear energy generation. Ignalina
nuclear power plant operated two RBMK-1500 reactors that are now being decommissioned. After careful consideration
“dry” storage technology in casks was selected for the interim storage of spent nuclear fuel (SNF) for up to 50 years.
SNF after pre-storage time in water pools for not less than 5 years is loaded into cast-iron or metal-concrete casks. In
this paper decay heat removal was modeled from specific GNB (Gesellschaft für Nuklear Behälter GmbH) metalconcrete
(CONSTOR RBMK-1500) casks for the long-term storage period up to 300 years. The ALGOR code was used
for the numerical modeling of the distribution of the heat fluxes and temperatures in a loaded cask placed in an open
type storage facility in both summer and winter taking into account local environmental conditions. A local sensitivity
analysis of the impact of fuel parameter uncertainties is also performed
Towards the unified description of light and heavy hadrons in the bag model approach
Mass spectra of ground state hadrons containing u-, d-, s-, c-quarks as well
as some lightest hadrons containing b-quarks are calculated on the basis of a
slightly modified bag model. The center-of-mass motion corrections are
incorporated using a wavepacket projection with Gaussian parametrization of the
distribution amplitude. We use running coupling constant and also allow the
effective quark mass to be scale-dependent. The impact of these modifications
on the hadron mass spectrum is investigated. A comparison of the predicted mass
values with the experimental data demonstrates that the modified bag model is
sufficiently flexible to provide a satisfactory description of light and heavy
hadrons (mesons and baryons) in a single consistent framework.Comment: 27 pages, 11 table
Heavy hadron spectroscopy and the bag model
Some time ago a slightly improved variant of bag model (the modified bag
model) suitable for the unified description of light and heavy hadrons was
developed. The main goal of the present work was to calculate the masses of the
ground state baryons containing bottom quarks in the framework of this model.
For completeness the predictions for other heavy hadrons are also given. The
reasonable agreement of our results with other theoretical calculations and
available experimental data suggests that our predictions could serve as a
useful complementary tool for the interpretation of heavy hadron spectra.Comment: 18 pages, 9 tables, references to experiments updated, rms deviations
given in some table
Magnetic properties of ground-state mesons
Starting with the bag model a method for the study of the magnetic properties (magnetic moments, magnetic dipole transition widths) of ground-state mesons is developed. We calculate the M1 transition moments and use them subsequently to estimate the corresponding decay widths. These are compared with experimental data, where available, and with the results obtained in other approaches. Finally, we give the predictions for the static magnetic moments of all ground-state vector mesons including those containing heavy quarks. We have a good agreement with experimental data for the M1 decay rates of light as well as heavy mesons. Therefore, we expect our predictions for the static magnetic properties (i.e., usual magnetic moments) to be of sufficiently high quality, too