## 3 Results and Discussion  
The measured values of densities have been accustomed to enumerate the molar volume, OPD and OMV have been obtained and listed in Table 1. The density and the molar volume values lies in the span of 4.354-6.578 gcm\({}^{-3}\) and 25.144-22.520 cm\({}^{3}\), respectively. Their variations with composition of PbO have already been discussed [30]. The OPD is another interesting parameter to identify the structure of the glass. It is observed that OPD increases from 75.563 to 84.366 with an upsurge in PbO content. The variation of OPD with percentage molar concentration of PbO is shown in Figure 1a. This increment may take place due to the enhancement in density due to the formation of the highly cross linked glass network [37]. The close packing of the glass network is further supported due to decreases of oxygen molar volume from 13.234-11.853 cm\({}^{3}\)/mol with upsurge in PbO content as shown in Figure 1b [37]. Figure 1: _Cont._  
The obtained values of \(n_{\rm b}\) and \(n_{\rm c}\) are presented in Table 2. The \(n_{\rm b}\) upsurge from 1.030 \(\times\) 10\({}^{23}\) cm\({}^{-3}\) to 1.257 \(\times\) 10\({}^{23}\) cm\({}^{-3}\). The increase in PbO content increases the non-bridging oxygens (NBOs), that accounts for the cross linkage of the network resulting in an upsurge in \(n_{\rm b}\). The \(n_{\rm c}\) increases from 1.939 to 2.207. This means that as the value of \(n_{\rm c}\) rises, the network is becoming more stiff and more dimensional. More likely, this is related to the rise in NBOs. The mechanical properties are presented in Table 2. Their variation with PbO content is represented in Figure 2a. The values decrease from 47.06 to 39.67 GPa for E, from 33.51 to 32.41 GPa for B, from 19.82 to 16.29 GPa for G, and from 59.94 to 54.14 GPa for L, respectively, as the PbO upsurges. It is found that the values of the moduli are decreasing, which results in a decrease in their rigidity and mechanical strength [38; 39]. The Poisson ratio (\(\sigma\)) possess an increasing trend from 0.266 to 0.297 with upsurge in PbO which is due to the lesser cross link density network and reduced rigidity [38; 39]. The fractal bond connectivity (d) ranges from 2.01 to 2.37 which hints that the present glasses have chain structure [40; 41; 42]. The H decreases from 2.89 to 2.07 GPa with upsurge in PbO content which hints that the rigidity and connectivity of the selected glasses is diminished [39]. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \multirow{2}{*}{**Glass Code**} & \multicolumn{8}{c}{**Mechanical Properties**} \\ \cline{2-10}  & \(n_{\rm b}\) & \(n_{\rm c}\) & E & B & G & L & \multirow{2}{*}{\(\sigma\)} & \multirow{2}{*}{**d**} & \multirow{2}{*}{**H** **(GPa)**} \\  & **(cm\({}^{-3}\))** & & **(GPa)** & **(GPa)** & **(GPa)** & & & & **(GPa)** \\ \hline Pb-S1 & 1.030 \(\times\) 10\({}^{23}\) & 1.939 & 47.06 & 33.51 & 19.82 & 59.94 & 0.266 & 2.37 & 2.89 \\ Pb-S2 & 1.076 \(\times\) 10\({}^{23}\) & 2.000 & 45.17 & 33.07 & 18.93 & 58.30 & 0.273 & 2.29 & 2.68 \\ Pb-S3 & 1.121 \(\times\) 10\({}^{23}\) & 2.064 & 43.03 & 32.30 & 17.94 & 56.23 & 0.279 & 2.22 & 2.48 \\ Pb-S4 & 1.171 \(\times\) 10\({}^{23}\) & 2.133 & 40.89 & 31.59 & 16.96 & 54.21 & 0.285 & 2.15 & 2.28 \\ Pb-S5 & 1.257 \(\times\) 10\({}^{23}\) & 2.207 & 39.67 & 32.41 & 16.29 & 54.14 & 0.297 & 2.01 & 2.07 \\ \hline \end{tabular}
\end{table} 
Table 2: Mechanical properties. Figure 1: Variation of (**a**) OPD (**b**) OMV with % composition of PbO. Figure 2: Variation of mechanical properties (**a**) elastic moduli (**b**) \(\sigma\) (**c**) d (**d**) H with PbO content. The MAC for the five Pb-SX glasses in four equidistant photon energies between 20 and 80 keV was evaluated using three photoatomic libraries available through EpiXS and Phy-X/PSD programs. The MAC data is tabulated in Table 3, for each library used. On the other hand, the EPICS2017 (of ENDF/B-VIII.0) released by IAEA is the newest electron-photon data and is now being embedded into several major codes.