310 research outputs found
Temporal characterization of rock dynamic destruction
Dynamic strength tests published in literature have been analysed by structuraltemporal damage criteria. Parameter τ - incubation time - describing material stability behaviour under high-rate influences have been estimated for Kimachi sandstone, Inada granite and Tage tuff. Two types of dynamic tensile experiments have been used: split Hopkinson pressure bar and spalling. Purely dynamic effect of fracture delay have been observed in the case of Kimachi sandstone and discussed
Topology and confinement at T \neq 0 : calorons with non-trivial holonomy
In this talk, relying on experience with various lattice filter techniques,
we argue that the semiclassical structure of finite temperature gauge fields
for T < T_c is dominated by calorons with non-trivial holonomy. By simulating a
dilute gas of calorons with identical holonomy, superposed in the algebraic
gauge, we are able to reproduce the confining properties below T_c up to
distances r = O(4 fm} >> \rho (the caloron size). We compute Polyakov loop
correlators as well as space-like Wilson loops for the fundamental and adjoint
representation. The model parameters, including the holonomy, can be inferred
from lattice results as functions of the temperature.Comment: Talk by M. M\"uller-Preussker at "Quark Confinement and Hadron
Structure VII", Ponta Delgada, Azores, Portugal, September 2 - 7, 2006, 4
pages, 2 figures, to appear in the Proceeding
Systematic limits on sin^2{2theta_{13}} in neutrino oscillation experiments with multi-reactors
Sensitivities to sin^2{2theta_{13}} without statistical errors (``systematic
limit'') are investigated in neutrino oscillation experiments with multiple
reactors. Using an analytical approach, we show that the systematic limit on
sin^2{2theta_{13}} is dominated by the uncorrelated systematic error sigma_u of
the detector. Even in an experiment with multi-detectors and multi-reactors, it
turns out that most of the systematic errors including the one due to the
nature of multiple sources is canceled as in the case with a single reactor
plus two detectors, if the near detectors are placed suitably. The case of the
KASKA plan (7 reactors and 3 detectors) is investigated in detail, and it is
explicitly shown that it does not suffer from the extra uncertainty due to
multiple reactors.Comment: 26 pages, 10 eps-files, revtex
Pionic atoms probing pi-NN resonances
The pion optical potential generated by the hypothetical pi-NN-coupled
NN-decoupled dibaryon resonance d'(2065) is calculated to the lowest order in
nuclear matter density. The contribution to the pion optical potential is found
to be within the empirical errors, so the d'(2065) existence currently does not
contradict to the observed properties of the pi-nucleus bound states. Future
progress in the pionic X-ray spectroscopy can reveal contributions of pi-NN
resonances to energy levels and widths of the pionic atoms.Comment: 3 pages REVTEX, 1 ps figur
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