Previously we identiÐed some short burst events from the BATSE 1B catalog that were consistent with an origin of primordial black hole evaporation at the quark-gluon phase transition. We showed that these events are also consistent with arising from a homogeneous spatial distribution. Recently the PHEBUS group has also indicated that the short bursts are consistent withIn this paper V /V ' D 1/2. we describe the results of the study of the BATSE 3B catalog shape that conÐrm the results from BATSE 1B.
Plasma-screening effects are investigated on the 1s→2p− (m=−1) and 1s→2p+ (m=+1) electron–ion collisional excitation rates in dense plasmas. The excitation rates are calculated using the semiclassical excitation cross sections obtained by the classical straight-line trajectory approximation with the nonspherical Debye–Hückel potential. The results show that the ratio of the 1s→2p+ to 1s→2p− excitation rates is found to be a slowly varying function of the temperature. Including the plasma-screening effects for hydrogenic ions, the ratio is found to be a monotonically increasing function of the parameter (Z2Ry/kT)1/2. However, without the plasma-screening effects, the ratio becomes a monotonically decreasing function. The plasma-screening effects appreciably enhance the 1s→2p− excitation rates and reduce the 1s→2p+ excitation rates.
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