Characteristics of Filtered Neutron Beam Energy Spectra at Dalat Reactor

Tran Tuan Anh,Vuong Huu Tan,Phu Chi Hoa,Pham Ngoc Son,Pham Dinh Khang

doi:10.4236/wjnst.2014.42015

Tran Tuan Anh, Vuong Huu Tan + Show 3 more

Open Access

https://doi.org/10.4236/wjnst.2014.42015

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Abstract

Filtered neutron technique was applied for producing quasi-monoenergetic neutron beams of 24 keV, 54 keV, 133 keV and 148 keV at the horizontal neutron channel No. 4 of the Dalat Nuclear Research Reactor. The study on physical characteristics of these beam lines has been carried out for efficient applications in neutron capture experiments. The filtered neutron spectrum of each beam has been simulated by Monte-Carlo method and experimentally measured by a gas-filled protonrecoil spectrometer. The neutron fluxes of these filtered beams were measured by the activation technique with standard foils of 197Au, using a high efficient HPGe digital gamma-ray spectrometer.

Highlights

The neutron transmission neutron filters technique [1] has been successfully applied to produce quasi-monoenergetic neutrons for basic research and application
The characteristic parameters of neutron energy spectrum, relative intensity, and filter materials have been studied for the 24 keV, 54 keV, 133 keV and 148 keV filtered neutron beams at the Dalat research reactor
The calculations code CFNB is developed and validated for user to evaluate the relative intensity of the expected filtered neutrons and the impurity neutrons

Summary

Introduction

The neutron transmission neutron filters technique [1] has been successfully applied to produce quasi-monoenergetic neutrons for basic research and application. The Dalat research reactor (DRR), was originally a TRIGA MARK II reactor with a nominal power of 250 kW completed construction and reached critical state in 1963. The filtered neutron technique has been introduced at the horizontal channel No 4 in order to create mono-energetic neutron beams of thermal, 24 keV, 54 keV, 59 keV, 133 keV and 148 keV. These filtered neutron beams have been used for implementation of neutron total and radiative capture reaction cross sections measurements, and elemental analysis with PGNAA method

Filtered Neutron Spectrum Calculations

Filtered Neutron Spectrum Measurements

Results and Discussion

Conclusion