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+// Scilab Code Ex9.4 Average number of collsions for thermalization of neutrons: Pg:202 (2008)

+A = 9;    // Mass number of beryllium

+xi = 2/A - 4/(3*A^2);    // Logarithmic energy decrement of energy distribution of neutron

+E0 = 2;    // Initial energy of neutrons, MeV

+En_prime = 0.025e-06;    // Thermal energy of the neutrons, MeV

+n = 1/xi*log(E0/En_prime);    // Average number of collisions needed for neutrons to thermalize

+En_half = 1/2*E0;    // Half of the initial energy of neutrons, MeV

+n_half = 1/xi*log(E0/En_half);    // Number of collsions for half the initial energy of neutrons

+printf("\nThe average number of collsions for thermalization of neutrons = %2d", n);

+printf("\nThe number of collsions for half the initial energy of neutrons = %3.1f", n_half);

+// Result 

+// The average number of collsions for thermalization of neutrons = 88

+// The number of collsions for half the initial energy of neutrons = 3.4
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