The physics of antimatter induced fusion and thermonuclear explosions
The possibility of using antihydrogen for igniting inertia l confinement fusion pellets or triggering large-scale thermonuclear ex plosions is investigated. The number of antiproton annihilations required to start a thermonuclear burn wave in either DT or Li2DT is found to be about 10 21 /� 2 , where � is the compression factor of the fuel to be ignited. We conclude that the financial and energy investments needed to produce such amou nts of antiprotons would confine applications of antimatter trigger ed thermonuclear devices to the military domain.
Atom-Antiatom Interactions
Atom-antiatom rearrangement collisions in which the nucleus-antinucleus bound state is formed are important processes in atom-antiatom interactions. We give a general discussion of the atom-antiatom interatomic potential energy $V$ and calculate $V$ for H-$\overline{\mathrm{H}}$, $\overline{p}$-H, and $\overline{M}$-Ar where $\overline{M}$ means antimuonium (${\ensuremath{\mu}}^{\ensuremath{-}}{e}^{+}$ atom). We apply the semiclassical and optical-potential methods to determine cross sections for rearrangement collisions. At low energies these collisions are the dominant processes leading to particle-antiparticle annihilation.
EFFECT OF SAMPLE PREPARATION ON WATER TREE RESISTANCE OF XLPE/SEBS BLENDS
The effects of an aromatic polymer, such as poly[styrene-b-(ethylene-co-butylene)b-styrene] (SEBS), and its preparation processes on water tree resistance, morphology, crystallinity, dielectric constant and dielectric loss tangent of crosslinked polyethylene (XLPE)/SEBS and XLPE/SEBS/ethylene vinyl acetate (EVA) blends were investigated. The XLPE/SEBS samples were characterized by means of differential scanning calorimetry, scanning electron microscopy, dielectric spectral analysis and the accelerated water treeing experiment. The results clearly showed that although SEBS was partially compatible with LDPE and it was dispersed evenly in XLPE matrix, the blends demonstrated excellent dielectric performances, such as dielectric constant and dissipation factor. The crystallinity of XLPE/SEBS blends was decreased with increase in SEBS content and it was further decreased with the addition of EVA. SEBS could effectively improve the water-tree resistance of XLPE and both SEBS and EVA were found to improve the water tree resistance of XLPE synergistically as expected. The differences in sample preparation processes could change the phase morphology and dielectric performance of the blends, and could also influence the dispersion of SEBS in XLPE matrix as well as the crystallinity of the blends. Different preparation processes led to different water tree resistance behaviours of the samples. The improvement of SEBS dispersion in XLPE matrix helped to improve the water tree resistance of XLPE.