Measurement of (n,α) and (n,2n) reaction cross sections at a neutron energy of 14.92 ± 0.02 MeV for potassium and copper with uncertainty propagation *

Abstract

Experimentally measured neutron activation cross sections are presented for the (n,α) , (n,α) , and (n,2n) reactions with detailed uncertainty propagation. The neutron cross sections were measured at an incident energy of 14.92 ± 0.02 MeV, and the neutrons were based on the t(d,n)α fusion reaction. The (n,α) reaction was used as a reference reaction for the normalization of the neutron flux. The pre-calibrated lead-shielded HPGe detector was used to detect the residues' γ-ray spectra. The data from the measured cross sections are compared to the previously measured cross sections from the EXFOR database, theoretically calculated cross sections using the TALYS and EMPIRE codes, and evaluated nuclear data.

Measurement of alpha induced reaction cross-sections on $^{nat}$Mo with detailed covariance analysis

“…Therefore, it is important to discuss covariance analysis in detail. Covariance analysis is a method used to estimate the uncertainty in the measured quantity with considering cross-correlations, the quantities measured in this study are nuclear reaction cross-sections [9][10][11][12]. In the present work, we provide covariance analysis of nuclear reactions 100 Mo(α,n) 103 Ru, nat Mo(α,x) 97 Ru, nat Mo(α,x) 95 Ru, nat Mo(α,x) 96g Tc, nat Mo(α,x) 95g Tc and nat Mo(α,x) 94g Tc, considering micro-correlations between measurements such as γ-ray abundance, γ-ray count, incident flux, detector efficiency etc.…”

Measurement of excitation functions for nat Cu(α, x) reactions with detailed covariance analysis

“…In Covariance analysis, the uncertainty propagation can be explained using the cross correlation between several observed values [32,33]. The method we have used to calculate the covariance matrix of the nuclear reaction in the present work is given in our previous article [22,34]. In the present experiment, we have used nat Ti(α, x) 51 Cr nuclear reaction as a monitor reaction.…”

New cross-section measurements for the (n, 2n), (n, p), and (n, α) reactions on bromine in the 14 MeV region with detailed uncertainty quantification*

“…The main sources of uncertainties during the determination of cross-sections included the following items (where the subscripts Nb/Al and x show the monitored and measured reaction-related terms, respectively): C x,Nb/Al is the γ-ray counting statistics, M x,Nb/Al is the target mass, η x is the target isotopic abundance, I x,Nb/Al refers to the γ-ray intensity, σ Nb/Al is the standard cross-section, ε x,Nb/Al is the efficiency (the calculated covariance and correlation matrix for the HPGe detector efficiency is given in Table 5), and S x,Nb/Al , D x,Nb/Al are the timing factors. The uncertainty within the estimated reaction cross-section was calculated by employing the fractional uncertainty (%) from all the variables listed above [44][45][46][47]. Tables 6-9 were utilized for the propagation of the covariance matrix among the various neutron energies and to illustrate the fractional uncertainties in the different factors responsible for the measured reaction crosssection.…”