Abstract. The neutron capture cross sections and the capture gamma-ray spectra of 127 I and 133 Cs at incident neutron energies from 15 to 100 keV have been measured by the time-of-flight method. Capture gammarays were detected with an anti-Compton NaI(Tl) spectrometer, and the pulse-height weighting technique was applied to derive capture yields. The capture cross sections of 127 I and 133 Cs were determined using the standard capture cross section of 197 Au. The total errors of the cross sections were 3.8-5.1%. The obtained cross sections were compared with evaluated values in JENDL-4.0 and ENDF/B-VII.1. For 127 I, the energy dependence is different between the present results and the evaluations. For 133 Cs, the evaluated values in JENDL-4.0 agree with the present results but the evaluated values in ENDF/B-VII.1 are smaller than the present results by 14%-18%. The capture gamma-ray spectra of 133 Cs and 127 I were derived by unfolding the pulse height spectra with detector response functions.
Abstract. The neutron capture cross section of 185 Re was measured in the astrophysically important energy region. Measurements were made using a neutron beam from a 7 Li(p, n) 7 Be neutron source with energies ranging from 3 to 90 keV. Two different experimental techniques, time-of-flight (TOF) and activation methods, were employed. In the TOF experiments, the total neutron capture cross section of 185 Re was determined by the pulse-height weighting technique. In the activation method, the partial capture cross section leading to the ground state of 186 Re was measured by detecting decay γ-rays from neutron activated samples. The present cross section values were compared with evaluated cross section data and previous measurements. The difference between the TOF and activation results was smaller than experimental uncertainties. This suggests that the production cross section of isomer states of 186 Re is very small.
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