Cross sections for (n, 2n), (n, p) and (n, α) reactions on rare-earth isotopes at 14.7MeV

Cross sections for formation of 139mCe radioisotope through the 140Ce (n, 2n) reaction over 13.73-14.77 MeV neutrons

Cross sections for the formation of metastable state of ¹³⁹Ce through ¹⁴⁰Ce(n, 2n)^139mCe reaction were measured at five neutron energies over 13.73-14.77 MeV range using the activation method and off-line gamma-ray spectrometric technique. These cross sections were in agreement with the corresponding theoretical cross sections estimated over 10-20 MeV neutrons by EMPIRE-3.2 code, using LEVEDEN 4 and strength function GSTRFN 0 parameters, and TALYS-1.8 code using ldmodel 5 and preeqmode 4 parameters. The estimated most probable excitation energies of ¹³⁹Ce were 1.320-3.877 MeV, respectively over 13.73 MeV and 14.77 MeV neutron energies.

Cross sections of (n,x) reactions on cerium isotopes induced by D-T neutrons

Neutron induced reaction cross sections of Cerium isotopes (¹³⁶Ce, ¹³⁸Ce, ¹⁴⁰Ce, ¹⁴²Ce) were investigated for the (n, 2n), (n, α), (n, p) and (n, γ) reactions in the neutron energy around 14 MeV. Experimental cross sections have been obtained for ¹³⁶Ce(n, 2n)^135m+gCe, ¹³⁸Ce(n, 2n)^137mCe, ¹⁴⁰Ce(n, 2n)^139m+gCe, ¹⁴²Ce(n, 2n)^141gCe, ¹⁴⁰Ce(n, p)^140gLa, ¹⁴²Ce(n, p)^142gLa, ¹⁴⁰Ce(n, α)^137mBa, ¹⁴²Ce(n, α)¹³⁹Ba and ¹⁴²Ce(n, γ)¹⁴³Ce reactions. The measured values were compared with the literature data as well as the evaluated nuclear data from ENDF/B-VII.1, CENDL-3.1, JENDL-4.0 and the calculated results by Talys-1.8 code.

Cross sections for d-3H neutron interactions with samarium isotopes

The cross sections for (n,x) reactions on samarium isotopes were measured at (d-T) neutron energies of 13.5 and 14.8 MeV with the activation technique. Samples were activated along with Nb and Al monitor foils to determine the incident neutron flux. Theoretical calculations of excitation functions were performed using the nuclear model codes TALYS-1.6 and EMPIRE-3.2 Malta with default parameters, at neutron energies varying from the reaction threshold to 20 MeV. The results were discussed and compared with experimental data found in the literature. At neutron energies 13.5 and 14.8 MeV, the cross sections of the 149Sm(n,p)149Pm reaction are reported for the first time. The cross sections of the 150Sm(n,p)150Pm, 144Sm(n,p)144Pm, 152Sm(n,α)149Nd and 144Sm(n,α)141Nd reactions at different neutron energies reported in the present work can be added as new data in the nuclear databases.

Neutron activation cross-sections for Ytterbium isotopes at (14.6±0.3)MeV

The cross-sections of (nat)Yb (n,x)(172,173) Tm, (174)Yb(n,p) (174) Tm, (174)Yb (n,α) (171)Er, (176)Yb(n,p) (176) Tm, (176)Yb(n,α)(173) Er, and (176) Yb(n,n')(176m)Yb have been measured at 14.6±0.3MeV neutron energy, among them two cross-sections (nat)Yb (n,x)(172,173)Tm are reported for the first time. These experimental cross-sections are compared with experimental data found in the literature, with evaluated nuclear data in JENDL-4.0 and TENDL-2010 libraries and with theoretically calculated values based on nuclear reaction modular codes EMPIRE-3.0 and TALYS-1.2.

Activation cross-sections for (158)Dy(n,p)(158)Tb, (156)Dy(n,alpha)(153)Gd and (160)Dy(n,p)(160)Tb reactions induced by neutrons at 14.7MeV

The cross-sections for the (158)Dy(n,p)(158)Tb, (156)Dy(n,alpha)(153)Gd and (160)Dy(n,p)(160)Tb reactions induced by 14.7MeV 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.