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    STUDIA PHYSICA - Ediţia nr.2 din 2010  
         
  Articol:   MEASUREMENT OF THERMAL NEUTRON CROSS-SECTION FOR 186W(n,γ)187W NUCLEAR REACTION BY THE ACTIVATION METHOD USING A SINGLE MONITOR.

Autori:  . 		 
       
         
  Rezumat:  We measured the thermal neutron cross-section for the nuclear reaction 186W(n,γ)187W by the activation method using a 197Au(n,γ)198Au monitor reaction as single comparator. The high-purity natural W and Au metallic foils with or without a cadmium shield case of 1 mm thickness were irradiated in a neutron field at the Facultaty of Physics neutron facility in Cluj-Napoca, Romania. The induced activities in the samples were measured by high-resolution γ-ray spectrometer with a calibrated HPGe detector. The necessary correction factors for γ-ray attenuation (Fg), thermal neutron self-shielding factor (Gth), were taken into account. The thermal neutron cross-section for the 186W(n,γ)187W nuclear reaction has been determined to be 38.69 barns, relative to the reference value of 98.65±0.09 barns for the 197Au(n,γ)198Au nuclear reaction. The present result is, in general, in good agreement with most of the experimental data and the recently evaluated value of ENDF/B-VII.0 and JENDL-3.2, data basis.

Keywords: Thermal neutron cross-section; 186W(n,γ)187W; 197Au(n,γ)198Au; Neutron Activation Method; Cross section at resonance; 

 
         
     
         
         
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