Improvement of photonuclear reaction model below 140 MeV in the PHITS code

Figures & data

Figure 1. The least-square fitting of E₀(A). E₀ obtained from JENDL/PD-2004 are represented by circles. The dashed line shows Equation (2(2) $$\begin{array}{ccc}\hfill E_0\left(A\right)& =& E_1+E_2{A}^{E_3},\hfill \end{array}$$(2) ) after least-square fitting.

Figure 2. The least-square fitting of Γ(A). Γ obtained from JENDL/PD-2004 are represented by circles. The dashed line shows Equation (3(3) $$\begin{array}{ccc}\hfill \Gamma \left(A\right)& =& {\Gamma }_1+{\Gamma }_2{A}^{{\Gamma }_3}.\hfill \end{array}$$(3) ) after least-square fitting.

Figure 3. The least-square fitting of σ₀(Z, A). σ₀ obtained from JENDL/PD-2004 are shown by circles. The fitted values using Equation (4(4) $${\sigma }_0(Z,A)={\sigma }_1{Z}^{{\sigma }_2}exp\left\{{\sigma }_3{E}_{\mathrm{sh}}(Z,A)\right\},$$(4) ) are represented by triangles.

Figure 4. All the σ₀(Z, A) values that Equation (4(4) $${\sigma }_0(Z,A)={\sigma }_1{Z}^{{\sigma }_2}exp\left\{{\sigma }_3{E}_{\mathrm{sh}}(Z,A)\right\},$$(4) ) can give.

Table 1. The obtained parameters for Equations (2(2) $$\begin{array}{ccc}\hfill E_0\left(A\right)& =& E_1+E_2{A}^{E_3},\hfill \end{array}$$(2) )–(4(4) $${\sigma }_0(Z,A)={\sigma }_1{Z}^{{\sigma }_2}exp\left\{{\sigma }_3{E}_{\mathrm{sh}}(Z,A)\right\},$$(4) ).

	Ei	Γi	σi
i = 1	−45.0	−1400	0.294
2	81.0	1420	1.75
3	−0.0608	−0.00184	0.00105

Figure 5. The Levinger parameters obtained through least-square fitting the evaluated data. The fitted parameters are represented by circles. The dashed line shows the averaged value of the circles for Z > 20, that is, L = 7.88.

Figure 6. The photon-induced total cross section of ¹²C. The open rectangles are the evaluated data from JENDL/PD-2004, and the dashed line is the separated σ_qd(E).

Figure 7. (γ,X) cross sections of ¹²C for an incident photon energy in the range 10–40 MeV. The experimental results of (γ,p) [16], (γ,n) [17], and (γ,3α) [18] are represented with the open triangles in each corresponding frame.

Figure 8. (γ,p) double-differential cross section of ⁴⁰Ca for an incident photon energy in the range 59.3–65.2 MeV at an angle of 90° calculated by PHITS 2.64 in comparison with the measurement data obtained by Ryckbosch et al. [19]. The solid line represents the calculation output, while the triangles represent the experimental data.

Figure 9. The neutron average flux inside the water phantom produced by a 30-MV electron-induced photon. The solid line represents the calculation results of PHITS 2.64, while the dashed line represents the calculation results of the older PHITS.

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