25,151 research outputs found
Testing the Equivalent Photon Approximation of the Proton in the Process
The accuracy of the equivalent photon approximation (EPA) of the proton in
describing the inelastic process is investigated. In
particular, the scale dependence of the corresponding inelastic photon
distribution is discussed. Furthermore, an estimate of the total number of
events, including the ones coming from the elastic and quasi-elastic channels
of the reaction, is given for the HERA collider.Comment: Revised version, one reference added, to appear in EP
Characteristic Variability Time Scales of Long Gamma-Ray Bursts
We determined the characteristic variability time scales (\Delta t_p) of 410
bright and long GRBs, by locating the peaks of their Power Density Spectra,
defined and calculated in the time domain. We found that the averaged
variability time scale decreases with the peak flux. This is consistent with
the time-dilation effect expected for the cosmological origin of GRBs. We also
found that the occurrence distribution of the characteristic variability time
scale shows bimodality, which might be interpreted as that the long GRB sample
is composed of two sub-classes with different variability time scales. However,
we found no difference for some other characteristics of these two sub-classes.Comment: 10 pages, 5 figures, corrected some typos and syntaxes, enlarged the
label fonts in fig.3 and fig.
Recent developments in the shell model Monte Carlo approach to nuclei
The shell model Monte Carlo (SMMC) approach provides a powerful method for
the microscopic calculation of statistical and collective nuclear properties in
model spaces that are many orders of magnitude larger than those that can be
treated by conventional methods. We discuss recent applications of the method
to describe the emergence of collectivity in the framework of the
configuration-interaction shell model and the crossover from vibrational to
rotational collectivity in families of rare-earth nuclei. We have calculated
state densities of these rare-earth nuclei and find their collective
enhancement factors to be correlated with the pairing and shape phase
transitions. We also discuss an accurate method to calculate the ground-state
energy of odd-even and odd-odd nuclei, circumventing the sign problem that
originates in the projection on an odd number of particles. We have applied
this method to calculate pairing gaps in families of isotopes in the iron
region.Comment: 7 pages, 5 figures, Proceedings of Horizons of Innovative Theories,
Experiments, and Supercomputing in Nuclear Physics (HITES 2012
Synthesis of elastomers for use with liquid fluorine Quarterly letter report, 1 Sep. - 30 Nov. 1968
Phosphines as initiators of polymerization of hexafluorobutyne-
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