[en] Cross sections for (n, 2n), (n, p), 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(d, n) 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)^92mmNb reactions. Data are reported for the following reactions: ¹⁵²Gd(n, 2n) ¹⁵¹Gd, ¹⁵⁴Gd(n, 2n) ¹⁵³Gd, ¹⁶⁰Gd(n, 2n) ¹⁵⁹Gd, ¹⁵⁶Gd(n, p) ¹⁵⁶Eu, ¹⁵⁷Gd(n, p) ¹⁵⁷Eu, ¹⁵⁸Gd(n, p) ¹⁵⁸Eu, and ¹⁵⁸Gd(n, α) ¹⁵⁵Sm. The cross sections are discussed and compared with the experimental data found in the literature. (orig.)

[en] Cross-sections for (n,2n), (n,p), and (n,t) reactions have been measured on praseodymium isotopes at the neutron energies from 13.5 to 14.8 MeV using the activation technique in combination with high-resolution gamma-ray spectroscopy. Data are reported for the following reactions: ¹⁴¹Pr(n,2n)¹⁴⁰Pr, ¹⁴¹Pr(n,p)¹⁴¹Ce, and ¹⁴¹Pr(n,t)¹³⁹Ce. Nuclear model calculations using the code HFTT, which employs the Hauser-Feshbach (statistical model) and exciton model (precompound effects) formalisms, were undertaken to describe the formation of the products. The results were compared with previous data.

[en] The cross-sections for formation of metastable state of ¹⁹⁵Pt (^195mPt, 98.85 keV, 4.02 d) through ^natPt(n,x)^195mPt reaction induced by 13.5-14.6 MeV neutrons were measured. Measurements were corrected for gamma-ray attenuations, random coincidence (pile-up), dead time and fluctuation of neutron flux. The data for ^natPt(n,x)^195mPt reaction cross-sections are reported to be 438±46, 399±44 and 372±43 mb at 13.5±0.2, 14.1±0.1 and 14.6±0.2 MeV incident neutron energies, respectively.

[en] The cross-sections for the ¹⁵⁸Dy(n,p)¹⁵⁸Tb, ¹⁵⁶Dy(n,α)¹⁵³Gd and ¹⁶⁰Dy(n,p)¹⁶⁰Tb reactions induced by 14.7 MeV neutrons were measured in this work and calculated by a previously developed formula. Measurements were corrected for gamma-ray attenuations, random coincidence (pile-up), dead time and fluctuation of neutron flux. Nuclear model calculations using the code HFTT, which employs the Hauser-Feshbach (statistical model) and exciton model (precompound effects) formalisms, were undertaken to describe the formation of the products.

[en] Highlights: ► The cross sections for the (n,x) reactions on ytterbium isotopes have been measured. ► Mono-energetic neutron beams using the D + T reaction; Energies: 13.5 and 14.8 MeV. ► Neutron cross-section measurements by means of the activation technique. ► Reference reactions ⁹³Nb(n,2n)^92mNb and ²⁷(n,α)²⁴Na. ► Data for ¹⁷²Yb(n,p)¹⁷²Tm and ¹⁷⁶Yb(n,d^*)¹⁷⁵Tm are reported for the first time. - Abstract: Measurements of (n,2n), (n,p), and (n,d^*) (The expression (n,d^*) cross section used in this work includes a sum of (n,d), (n,np) and (n,pn) cross sections.) reaction cross-sections on ytterbium isotopes have been carried out in the range of 13.5–14.8 MeV using the activation technique. The monoenergetic neutron beams were produced via the ³H(d,n)³He reaction. The neutron energies of different directions were determined using the Nb/Zr method. Samples were activated along with along with Nb and Al monitor foils to determine the incident neutron flux. Data are reported for the following reactions: ¹⁶⁸Yb(n,2n)¹⁶⁷Yb, ¹⁷⁰Yb(n,2n)^169m+gYb, ¹⁷⁶Yb(n,2n)^175m+gYb, ¹⁷²Yb(n,p)¹⁷²Tm, ¹⁷³Yb(n,p)¹⁷³Tm, ¹⁷⁶Yb(n,d^*)¹⁷⁵Tm, ¹⁷⁴Yb(n,p)¹⁷⁴Tm, and ¹⁷⁶Yb(n,p)¹⁷⁶Tm. The experimentally deduced cross-sections are compared with the existing experimental data. Furthermore, theoretical statistical model, based on the Hauser–Feshbach formalism, have been carried out using the HFTT

[en] The neutron capture cross section of the neutron magic isotope ¹³⁹La has been measured relative to that of ²⁷Al by means of the activation method. The fast neutrons were produced via the ³H(d,n)⁴He reaction on Pd-300 neutron generator. The natural high-purity La₂O₃ powder was used as target material. Induced gamma activities were measured by a high-resolution gamma-ray spectrometer with high-purity germanium (HPGe) detector. Measurements were corrected for gamma-ray attenuations, random coincidence (pile-up), dead time and fluctuation of neutron flux. The new values for E_n=13.5±0.2, 14.1±0.2, and 14.8±0.2 MeV are found to be 1.30±0.08, 1.15±0.08 and 0.99±0.07 mb, respectively. Results were discussed and compared with some corresponding values found in the literature. - Highlights: ► D–T neutron source was used to measure cross sections using activation method. ► ²⁷Al(n,α)²⁴Na was used as the monitor for the measurement. ► The cross sections for the (n,γ) reactions on neutron magic isotope ¹³⁹La have been measured. ► The data for ¹³⁹La(n,γ)¹⁴⁰La reaction are presented. ► The results were compared with previous data and with evaluation data

[en] We have measured the ¹⁶⁷Er(n,p)¹⁶⁷Ho cross-sections at two different neutron energies 13.5 and 14.8 MeV. Measurements were performed at Pd-300 neutron generator of Chinese Academy of Engineering Physics (CAEP) with monoenergetic neutrons produced via the ³H(d,n)⁴He reaction using a tritium–titanium (T–Ti) target. Induced gamma activities were measured by a high-resolution gamma-ray spectrometer with high-purity germanium (HPGe) detector. The data for ¹⁶⁷Er(n,p)¹⁶⁷Ho reaction cross-sections are reported to be 2.2±0.6 and 2.8±1.4 mb at 13.5±0.2 and 14.8±0.2 MeV incident neutron energies, respectively. The cross sections were also estimated with the TALYS-1.4 nuclear model code and compared with experimental data found in the literature, and with the comprehensive evaluation data in ENDF/B-VII.1 and JEFF-3.1/A libraries. - Highlights: • D–T neutron source was used to measure cross sections using activation method. • ²⁷Al(n,α)²⁴Na was used as the monitor for the measurement. • The cross sections for the ¹⁶⁷Er(n,p)¹⁶⁷Ho reactions have been measured. • Contribution of the interfering reaction ¹⁷⁰Er(n,α)¹⁶⁷Dy was subtracted. • The results were compared with previous data and with evaluation data