Measurement of the Thermal Neutron Capture Cross Section of Cs-137

Abstract

Thermal neutrons / Cross section / Cesium-137 / Activation / Gamma spectrometry / Fission product SummaryMeasurements of the thermal neutron cross section of the reaction 137 Cs(n,y) l38 Cs have been performed using high resolution y-ray spectrometry and applying covariance analysis to all uncertainties involved. The result was (0.253 ±0.015) b. This result is discussed and compared with previous measurements.

Measurement of the thermal neutron capture cross section and resonance integral of Am-241

“…In a previous work of this laboratory the cross section for 137 Cs(n, γ ) 138g Cs reaction has been measured [6]. In the present paper the cross section and resonance integral for 241 Am(n, γ ) 241g Am reaction has been investigated.…”

Medidas de Parâmetros Associados a Reações Nucleares Induzidas por Nêutrons no Reator IEA-R1

“…Neste programa, foram incluídas as reações 137 Cs(n,γ) 138 Cs, 57 Co(n,γ) 58 Co e 241 Am(n,γ) 242g Am. Além do doutorado, estes estudos deram origem a várias publicações em periódicos internacionais [5][6][7][8]. Após estas medidas, o LMN participou de um estudo desenvolvido pelo Instituto de Física da USP, relacionado à determinação da secção de choque e integral de ressonância para a reação 41 K(n,γ) 42 K, dando origem a uma publicação internacional [9].…”

41K(n,γ)42K thermal and resonance integral cross section measurements

“…The waiting times for the first gamma-ray spectrum measurement run of the KNO 3 the other relevant activity is 24 Na, an expected contaminant since K and Na belong to the same chemical family. In AuAl monitors, no contaminant was identifed.…”

“…The experimental procedure was similar to that used in 137 Cs and 57 Co neutron capture cross section measurements reported in [3] and [4]. The thermal and epithermal fluxes were calculated using the Westcott formalism [1], the cadmium ratio method [5] and the cadmium separation components methodology proposed by Axton [6].…”