Fundamental Data on Neutron Activation and Gamma-ray Spectrometry of Platinum Metals

Neutron activation and high resolution gamma spectrometry--activation analysis.

Comparison of gamma-ray spectrometry and delayed neutron counting for determination of uranium.

Analogies between neutron and gamma-ray imaging

Although the physics describing the interactions of neutrons with matter is quite different from that appropriate for hard x-rays and gamma rays, there are a number of similarities that allow analogous instruments to be developed for both types of ionizing radiation. A pinhole camera, for example, requires that the radiation obeys some form of geometrical optics, that a material can be found to...

Gamma-ray Bursts and Neutron-star Mergers

We present the discovery observations for the optical counterpart of the γ-ray burster GRB 970508 and an analysis of its light curve and of the HST imaging data. We also present a detailed analysis of the HST images claimed to show a proper motion of the optical counterpart of GRB 970228 and conclude that, within the uncertainties, there is no proper motion. We examine several aspects of the ne...

Neutron-fed afterglows of gamma-ray bursts

A neutron component is practically inevitable in baryonic fireballs of gamma-ray bursts (GRBs). At late stages of the explosion, the neutrons fully decouple from the ion ejecta and coast freely. The presence of the neutron ejecta qualitatively changes the mechanism of the GRB afterglow. The neutrons lead the decelerating blast wave and gradually decay, leaving behind a trail of the decay produc...