Measurement of cross section of the98 Mo(n, ) 99 Mo reaction using monochromatic thermal neutrons Abstract: The cross sections of the reaction 98 Mo( , ) 99 Mo at neutron energies of 0.0334 eV and 0.0536 eV were measured for the first time using the activation technique, and the resulting values of 116 ± 7 mb and 91 ± 5 mb, respectively, are in good agreement with the JENDL-4 and ENDF/B-VII data files. Those measured values were extrapolated to the energy 0.0253 eV assuming 1/v dependence in the thermal region and the results were compared with the integrally measured values reported in the literature. The new data are thus useful to check the evaluated excitation function. Keywords: Neutrons of energies 0.0253 eV, 0.0334 eV and 0.0536 eV, Thermal energy region, ( , ) reaction cross section of 98 Mo, TRIGA Mark II reactor, Powder diffractometer, Triple axis spectrometer.

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The neutron capture cross section for the 152 Sm( , ) 153 Sm reaction at an energy of 0.0334 eV was measured for the first time using monochromatic neutrons of a powder diffractometer at the TRIGA Mark II nuclear reactor at Dhaka, Bangladesh. The 197 Au( , ) 198 Au reaction was used to monitor the neutron beam intensity. The radioactivity of the products was determined via high resolution -ray spectrometry. The obtained cross section value is 184 ± 22 b, which is consistent with both the ENDF/B-VII and TENDL-2012 data libraries. The measured value at 0.0334 eV and the previous data at 0.0536 eV confirm the reliability of the data in the above libraries.