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  • Author: Fengqun Zhou x
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Cross sections for (n,2n) and (n,p) reactions have been measured on tellurium isotopes at the neutron energies of 13.5−14.6 MeV using the activation technique. Data are reported for the following reactions: 120Te(n,2n)119mTe, 120Te(n,2n)119gTe, 122Te(n,2n)121mTe, 122Te(n,2n)121gTe, 124Te(n,2n)123mTe, 128Te(n,2n)127gTe, 130Te(n,2n)129mTe, 120Te(n,p)120mSb, 122Te(n,p)122m+gSb, 124Te(n,p)124m+gSb, 126Te(n,p)126m+gSb and 128Te(n,p)128m+gSb. These new data for the cross sections of tellurium isotopes have smaller uncertainties than those reported in the previous literature. The first data for the 120Te(n,p)120mSb reaction cross sections are presented. In our experiment, natural high-purity tellurium powder was used as target material and the samples were wrapped in cadmium foil during the irradiation so the influence of the (n,γ) reactions of thermal neutrons was reduced to a low level and the interfering reactions were avoided or subtracted. The HPGe detector employed in this work has better resolution than NaI(Tl). Furthermore, while gamma-ray yields were measured and then turned into cross sections using the formula in Sect. 2.2, the most recent and accurate nuclear data available were adopted. These cumulative improvements should make our results more accurate and reliable than those reported in the previous literature. Our results are useful for verifying the accuracy of nuclear models used in the calculation of cross sections and are expected to help new evaluations of the 14 MeV neutron cross sections on isotopes of tellurium.

Abstract

Cross sections for (n, 2n), (np), and (n, α) reactions have been measured on gadolinium isotopes at the neutron energies from 13.5 to 14.8 MeV using the activation technique in combination with high-resolution gamma-ray spectroscopy. Neutrons were produced via the 3H(dn) 4He reaction using solid TiT. The neutron fluences were determined using the monitor reactions 93Nb(n, 2n)92mNb and 27Al(n, α) 24Na. The neutron energy in this measurement was determined by cross section ratios for the 90Zr(n, 2n)89m+gZr and 93Nb(n, 2n)92mNb reactions. Data are reported for the following reactions: 152Gd(n, 2n) 151Gd, 154Gd(n, 2n) 153Gd, 160Gd(n, 2n) 159Gd, 156Gd(np) 156Eu, 157Gd(np) 157Eu, 158Gd(np) 158Eu, and 158Gd(n, α) 155Sm. The cross sections are discussed and compared with the experimental data found in the literature.