Definition of cross sections 1 - Moodle
Definition of cross sections 1 - Moodle
Definition of cross sections 1 - Moodle
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The SLBW formula 5Summation <strong>of</strong> Eq. (28) with Eqs. (31) corresponding to all absorption types <strong>of</strong> nuclearreactions leads to the SLBW expression <strong>of</strong> the total <strong>cross</strong> section:(35)σ(e exc ) = σ l p +σ 0 sin2φ lu1+u 2 +σ 0 cos2φ l11+u 2 .Equations (28) and (31) are giving the variation <strong>of</strong> the absorption-type and scattering <strong>cross</strong><strong>sections</strong> with energy e exc in the case <strong>of</strong> a unique resonance. These variations are depictedin figure.σ e (b)9σγ (b)20σf (b)808.751040208.50 00 0.2 0.4 0.6 0.8 0 0.2 0.4 0.6 0.8 0 0.2 0.4 0.6 0.8E (eV)E (eV)E (eV)Figure depicts a nice illustration <strong>of</strong> the effect <strong>of</strong> the interference term in Eq. (31).ENE6101: Week 4 Cross <strong>sections</strong> – 28/37
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