Die chemische Fixierung von Kryptonisotopen in Zeolith 5 A — Voraussetzung für die Messung von 25 keV Neutroneneinfang- querschnitten mit der Aktivierungstechnik/ The Chemical Fixation of Kr Isotopes in Zeolite 5 A.- Prerequisite for the Determination of 25 keV Neutron Capture Cross Sections with the Activation Method

Abstract

Abstract By chemical fixation of Kr in zeolite 5 A adequate samples can be obtained to determine the capture cross section of reactions such as 84 Kr (n, γ) 85Krm and 86Kr (n, γ) 87Kr. The employed zeolite loading was of the order 52-66 [cm3 STP Kr/g zeolite]. The capture cross section of the reaction 84Kr(n, γ) 85Krm was determined at thermal and 25 keV neutron energy. The value obtained at 25 keV is of relevance to the stellar nucleosynthesis of heavy elements.