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diff --git a/1970/CH5/EX5.9/Ch05Exa9.sce b/1970/CH5/EX5.9/Ch05Exa9.sce
new file mode 100755
index 000000000..f640baa38
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+++ b/1970/CH5/EX5.9/Ch05Exa9.sce
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+// Scilab code Exa5.9 : : Page 205(2011)
+clc; clear;
+a_v = 14;        // Volume energy constant, MeV
+a_s = 13;        // Surface energy constant, MeV
+a_c = 0.60;      // Coulomb energy constant, MeV
+a_a = 19;        // Asymmetric energy constant, MeV
+A = 202;        // Mass number
+Z = 82;         //  Atomic number 
+dE_by_dN = -8/9*a_s/A^(4/3)-4/3*a_c*Z/A^(4/3)*(1-4*Z/(3*A))-16*a_a*Z/A^2*(1-2*Z/A);        // Slope, mega electron volts per nucleon
+printf("\nThe slope of alpha decay energy versus atomic number = %7.5f MeV/nucleon", dE_by_dN);
+
+// Result
+// The slope of alpha decay energy versus atomic number = -0.15007 MeV/nucleon 
+\ No newline at end of file