THERMAL NEUTRON ABSORPTION CROSS SECTION OF Xe¹³⁵

Abstract

The effective neutron absorption cross section of Xe135 has been measured with a mass spectrometer by observing the variation in the Cs135/Cs137 fission yield ratio obtained at various thermal neutron fluxes. Values of 3.15 ± 0.06 megabarns and 3.27 ± 0.11 megabarns have been determined for neutron temperatures of 120 °C and 137 °C respectively.

High-Sensitivity Mass Spectroscopy in Nuclear Studies

“…capture cross sections can be computed from the latter if the absolute capture cross section of the element is known from other measurements. Table XI gives a few mass-spectroscopically determined capture cross sections of some the capture cross sections can then be given relative to the rather well-known capture cross section of one of these nuclides (217,221,222). b. Spallation processes.-Several spallation products formed in the ir radiation of targets by fast protons have been investigated by mass-spectro scopic methods.…”