Resonance Parameters for Measured KeV Neutron Capture Cross Sections
Resonance Parameters for Measured KeV Neutron Capture Cross Sections

Author: A. R. de L. Musgrove

Publisher:

Published: 1969

Total Pages: 5

ISBN-13: 9780642993656

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"All available neutron capture cross sections in the keV region (~ 5 to 100 keV) have been fitted with resonance parameters. Capture cross sections for nuclides with reasonably well known average s-wave parameters, but no measured cross section, have been calculated and tabulated using p- and d-wave strength functions interpolated between fitted values. Several of these nuclides are of interest in the theory of slow nucleosynthesis of heavy elements in stars, and the product of cosmic abundance (due to the s-process) and capture cross section at 30 keV has been plotted versus mass number"--Title page.

Neutron Capture Cross Sections of 178, 179, 18°Hf and the Origin of Nature's Rarest Stable Isotope 18°Ta
Neutron Capture Cross Sections of 178, 179, 18°Hf and the Origin of Nature's Rarest Stable Isotope 18°Ta

Author:

Publisher:

Published: 1982

Total Pages:

ISBN-13:

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The neutron capture cross sections of 178, 179, 18°Hf were measured in the energy range 2.6 keV to 2 MeV. The average capture cross sections were derived and fitted in terms of strength functions. Resonance parameters for the observed resonances below 10 keV were determined by shape analysis. Maxwellian-averaged capture cross sections were computed for thermal energies with kT between 5 and 100 keV. The cross sections for kT = 30 keV were used to determine the population probability of the 8- isomeric level in 18°Hf by neutron capture as (1.24 +- 0.06)% and the r-process abundance of 18°Hf as 0.0290 (Si = 106). These quantities served to analyze s- and r-process nucleosynthesis of 18°Ta, nature's rarest stable isotope.