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The $^{135}$Cs(n,$\gamma$) cross section at 30 and 500 keV

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Published: Aug 30, 2021
DOI: https://doi.org/10.12681/hnps.3346
N. Patronis
P. A. Assimakopoulos
S. Dababneh
M. Heil
F. Kaeppeler
D. Karamanis
P. E. Koehler
R. Plag
Abstract

The neutron capture cross section of the unstable isotope $^{135}$Cs was measured relative to that of gold by means of the activation method. The sample was produced by ion implantation in a high resolution mass separator and irradiated with quasi-monoenergetic neutrons at 30 keV and 500 keV, using the $^{7}$Li(p,n)$^{7}$Be reaction. After the irradiations at the above energies, one more irradiation with thermal neutrons was used for defining the sample mass and for measuring the half-life of $^{136}$Cs. The neutron capture cross section was  determined as 164 $\pm$ 10 mbarn and 34.8 $\pm$ 3.0 mbarn at 30 keV and 500 keV, respectively, and were used to normalize the theoretically derived cross section shape.

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