Now showing items 121-126 of 126
Low-energy gamma radiation from Cen. X-4
In July of 1969 a new X-ray source was detected in the southern sky near the constellation Centaurus. This source, identified as Centaurus X-4, displayed a variable intensity in the energy range 3 to 12 keV which at its ...
Detection and analysis of recombination line emissions from galactic HII regions
A survey of ten galactic HII regions provided the most extensive high frequency (near 8.6 GHz) recombination line data to date, with several of the sources being observed for these lines for the first time at such a short ...
Nuclear statistical equilibrium and the iron peak
The equations governing the abundance distribution of the nuclear species (atomic nuclei) under conditions of statistical equilibrium of the strong nuclear interaction are rederived and discussed. An algorithm for their ...
Improved observational programs for the Arecibo ionospheric observatory
A new set of ionospheric data taking programs have been completed for the Arecibo Ionospheric Observatory. One will cover the 200-2000 km range and measure electron number densities, temperatures and composition with a ...
Penning ionization studies using a crossed-beam technique
A modulated crossed-beam apparatus for the investigation of Penning ionization at thermal energies has been designed and constructed. Details are given for the production of a beam of helium metastable atoms by electron ...
Nucleosyn by rapid neutron capture during explosive carbon burning
The purpose of this calculation is to attempt to account for the solar system abundances of certain neutron-rich nuclei by rapid neutron capture upon various seed nuclei (Fe56, Ni58, Cr Ca Ca40 and A36) in the iron peak ...