Gamma-gamma directional correlations in 140Ce

Gamma - Gamma , Gamma - Electron Colliders ∗

It is very likely that in 3-4 years the construction of one or two linear colliders with c.m.s energy up to 0.5–1.5 TeV will be started. Besides eecollisions, linear colliders give a unique possibility to study γγ and γe interactions at energies and luminosities comparable to those in ee collisions. High energy photons for γγ and γe collisions can be obtained using laser backscattering. These t...

No Evidence for Gamma-Ray Burst/Abell Cluster or Gamma- Ray Burst/Radio-Quiet Quasar Correlations

We examine the recent claims that cosmic gamma-ray bursts are associated with either radio-quiet quasars or Abell clusters. These associations were based on positional coincidences between cataloged quasars or Abell clusters, and selected events from the BATSE 3B catalog of gamma-ray bursts. We use a larger sample of gamma-ray bursts with more accurate positions, obtained by the 3rd Interplanet...

Spectrum – energy correlations in Gamma – Ray Bursts confront extremely energetic

The origin, reliability and dispersion of the E p,i – E iso and other " spectrum–energy " correlations is a highly debated topic in GRB astrophysics. GRB 080916C, with its huge radiated energy (E iso ∼ 10 55 erg in the 1 keV – 10 GeV cosmological rest–frame energy band) and its intense GeV emission measured by Fermi, gives us a unique opportunity to further investigate this issue. We also inclu...

Spatio-temporal correlations in human gamma band electrocorticograms.

Animal electrocorticogram (ECoG) studies have shown that spatial patterns in the gamma band (>20 Hz) reflect perceptual categorization. Spatio-temporal correlations were investigated in the 20-50 Hz range in search for similar phenomena in human ECoG. ECoGs were recorded in a somatosensory discrimination task from 64-electrode subdural grid arrays, with inter-electrode spacing of 1 cm, overlyin...

Gamma - Gamma Colliders