Phenomenological approach affecting of (n, p) reaction cross sections via 14.5-MeV neutrons (original) (raw)

The Systematics Study of (n, p) Reaction Cross-Sections at 14.7 MeV Neutron Energy

World Journal of Nuclear Science and Technology, 2022

Based on the statistical model and taking into account the Q-value dependence and odd-even effects, we proposed a new empirical formula to reproduce the cross sections of the (n, p) reactions at 14.7 MeV neutron energy and at the target mass number 14 ≤ A ≤ 198 for even A and 29 ≤ A ≤ 205 for odd A. All calculated results from the proposed empirical formula were compared to the experimental data as well as the available semi-empirical formula obtained by other authors. A high level of agreement has been found between the collected experimental data and the most of semiempirical formulae obtained by others.

Cross-sections of (n,p) reaction at a neutron energy of 14–15 MeV

Journal of Radioanalytical and Nuclear Chemistry, 1996

The (n,p) reaction cross-sections induced by 14–15 MeV neutrons have been analyzed on the basis of available data taken from the literature, using the multiple regression technique. An empirical formula describing the dependence of (n,p) reaction cross-sections on 5 parameters: neutron (N) and proton (Z) number, asymmetry factor ((N−Z)/A) where A=N+Z, neutron and proton binding energies (Bn, Bp) has been found. Its validity is checked and discussed.

Cross section calculation of (n,p) and (n,2n) nuclear reactions on Zn, Mo and Pb isotopes with ~ 14 MeV neutrons

Journal of Radioanalytical and Nuclear Chemistry, 2019

In this article, we are presenting the results of model calculations for (n,p) and (n,2n) reaction cross sections using the standard nuclear reaction codes TALYS-1.8 and EMPIRE-3.2 for 67,70 Zn, 92,96,100 Mo and 208 Pb isotopes in neutron energy range 0-20 MeV. Different nuclear level density models and optical model potential available in the codes have been tested for the estimation of cross sections of desired nuclear reactions. Moreover, in this work, the contribution to the cross section from different reaction mechanisms such as compound nucleus process, pre-equilibrium emission and direct reaction is also discussed in detail. The calculated results are compared with the existing experimental data from the IAEA-EXFOR database.

An empirical formula for (n, 2n) reaction cross sections in the neutron energy range of about 14.5 MeV

Journal of Radioanalytical and Nuclear Chemistry, 1998

The (n,2n) threshold reaction cross-sections, available in the literature are analysed for nuclei with 20≤Z≤92 in the neutron energy range of about 14.5 MeV. An empirical formula based on multiple regression technique is proposed for quick estimation of the (n,2n) reaction cross sections. The results obtained are compared with experimental data and those from other empirical formulae as long as byN-Z systematic. The validity of this formula is discussed.

Systematic study of (n,p) reaction cross sections from the reaction threshold to 20 MeV

Physical Review C, 2012

The cross sections of nat Cr(n,x) 52 V, 52 Cr(n,p) 52 V, nat Cr(n,x) 53 V, 53 Cr(n,p) 53 V, nat Zn(n,x) 66 Cu, 66 Zn(n,p) 66 Cu, nat Zn(n,x) 68 Cu m , 68 Zn(n,p) 68 Cu m , nat Mo(n,x) 97 Nb g , 97 Mo(n,p) 97 Nb g , nat Mo(n,x) 97 Nb m , 97 Mo(n,p) 97 Nb m , nat Sn(n,x) 116 In m1+m2 , 116 Sn(n,p) 116 In m1+m2 , nat Sn(n,x) 117 In g , 117 Sn(n,p) 117 In g , nat Sn(n,x) 118 In m1+m2 , 118 Sn(n,p) 118 In m1+m2 , nat Sn(n,x) 120 In x , 120 Sn(n,p) 120 In x , nat Ba(n,x) 138 Cs, and 138 Ba(n,p) 138 Cs reactions have been measured at 14.8 MeV neutron energy. In the present work, the contributions of (n,np), (n,pn), and (n,d) reactions from heavier isotopes are subtracted. The cross sections were also estimated with the TALYS-1.2 nuclear model code using different level density models, at neutron energies varying from the reaction threshold to 20 MeV. The variations in the (n,p) cross sections with the neutron number in the isotopes of an element are also discussed in brief.

Measurements of isomeric cross sections for the (n,α) reaction on the ¹⁴²Nd isotope at approximately 14 MeV neutrons

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine, 2014

In this study, the activation cross sections were measured for (142)Nd(n,α)(139m)Ce reaction at four neutron energies between 13.57 and 14.83 MeV, which were produced by a neutron generator through (3)H((2)H,n)(4)He reaction. The production of short-lived activity and the spectra accumulation were performed by the cyclic activation technique. Induced gamma-ray activities were measured using a high resolution gamma ray spectrometer equipped with a high-purity Germanium (HpGe) detector. In the cross section measurements, corrections were made regarding the effects of the gamma-ray attenuation, the dead-time, the fluctuation of the neutron flux, and low energy neutrons. The measured cross sections were compared with the published literature and the results of the model calculation (TALYS 1.4).

Recommended Cross Sections of 168Er and 170Er Isotopes for (n,p), (n,2H) and (n,?) Reactions at 14.0 MeV

International Journal of Scientific Research in Science and Technology, 2017

The cross sections are reproduced in fine steps of incident neutron energy with 0.01MeV intervals with their corresponding errors. The recommended cross sections for available experimental data taken from EXFOR library have been calculated for all the considered neutron induced reactions for Er (Z=68; A=168-170) isotopes. The calculated results are analyzed and compared with the experimental data.

Cross Sections of Neutron Reactions (n,p)(n, p) (n,p), (n,alpha)(n,\ alpha) (n,alpha), (n,2n)(n, 2n) (n,2n) on Isotopes of Dysprosium, Erbium and Ytterbium at sim\ sim sim14 MeV Neutron Energy

The cross sections of the nuclear reactions induced by neutrons at En= 14.6 MeV on the isotopes of Dy, Er, Yb with emission of neutrons, proton and alpha-particle are studied by the use of new experimental data and different theoretical approaches. New and improved experimental data are measured by the neutron-activation technique. The experimental and evaluated data from EXFOR, TENDL, ENDF libraries are compared with different systematics and calculations by codes of EMPIRE 3.0 and TALYS 1.2. Contribution of pre-equilibrium decay is discussed. Different systematics for estimations of the cross-sections of considered nuclear reactions are tested. I.

Determination of Nuclear Reaction Cross-sections for Neutron-Induced Reactions in Some Odd – A Nuclides

2014

The effect of the odd-even nature and mass of target nucleus on neutron reaction cross-sections have been investigated for the energy range of 1 – 30 MeV for neutron-induced reactions in the odd – A nuclides: , and using the EXIFON code. This code which uses one global parameter set and is based on the analytical model for statistical multistep direct and multistep compound reactions, was used to calculate cross-sections for the (n, ?), (n, p), and (n, 2n) reactions. Calculations were compared with experimental data (EXFOR) and evaluated data (ENDF) from the IAEA nuclear data bank. Results show that charged particle emissions (( n , ? ) and ( n , p )) are the most dominant reaction channels in the light and intermediate mass nuclei considered. Results also show that the Na ( n , 2n ) reaction cross-section over predicted experimental and evaluated data, while the Na ( n , ? ) reaction agrees with experimental data and was in fair agreement with evaluated data while the Na (n, p) c...

Cross Section Calculations of (n,2n) and (n,p) Nuclear Reactions on Germanium Isotopes at 14–15 MeV

Journal of Fusion Energy, 2016

Neutron incident reaction cross sections of Germanium isotopes (70,72,74,76 Ge) were investigated for the (n,2n) and (n,p) reactions around 14-15 MeV. Cross section calculations have been presented for 70 Ge(n,2n) 69 Ge, 72 Ge(n,2n) 71 Ge, 74 Ge(n,2n) 73 Ge, 76 Ge(n, 2n) 75 Ge, 70 Ge(n,p) 70 Ga, 72 Ge(n,p) 72 Ga, 74 Ge(n,p) 74 Ga, and 76 Ge(n,p) 76 Ga reactions. Theoretical calculations were performed with four different computer codes: ALICE/ ASH for the Geometry Dependent Hybrid model, TALYS 1.6 for two component Exciton model, EMPIRE 3.2 Malta for Exciton model and PCROSS for Full Exciton model with the incident neutron energy up to 20 MeV. The (n,2n) and (n,p) reaction cross section calculations were compared with empirical formulas derived by several researchers and compared with the experimental data obtained from EXFOR database as well as with evaluated Nuclear data files (ENDF/B-VII.1: USA 2014). Results show good agreement between the theoretical calculations having a major importance in nuclear data evaluation calculations and the experimental data from literature.