Characterization of an INVS Model IV Neutron Counter for High Precision ($γ,n$) Cross-Section Measurements

Details Characterization of an INVS Model IV Neutron Counter for High Precision ($γ,n$) Cross-Section Measurements Characterization of an INVS Model IV Neutron Counter for High Precision ($γ,n$) Cross-Section Measurements

2010-10-19

arxiv.org/abs/1010.3930v3

Nucl.Instrum.Meth.A647:55-62,2011

Physics

Nuclear Physics

Nuclear Experiment

22 pages, 13 figures

Scientific paper

10.1016/j.nima.2011.01.177

A neutron counter designed for assay of radioactive materials has been adapted for beam experiments at TUNL. The cylindrical geometry and 60% maximum efficiency make it well suited for ($\gamma,n$) cross-section measurements near the neutron emission threshold. A high precision characterization of the counter has been made using neutrons from several sources. Using a combination of measurements and simulations, the absolute detection efficiency of the neutron counter was determined to an accuracy of $\pm$ 3% in the neutron energy range between 0.1 and 1 MeV. It is shown that this efficiency characterization is generally valid for a wide range of targets.

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