What are prompt and delayed neutrons? Discuss the role of delayed neutrons in reactor safety.
Prompt neutrons are those emitted almost immediately (within about 10⁻¹⁴ seconds) during the fission process of a heavy nucleus like uranium-235 or plutonium-239. They are released directly from the splitting of the nucleus and constitute the majority of neutrons in a fission event, typically around 99% of the total neutrons produced. These neutrons are highly energetic and play a primary role in sustaining the chain reaction in a ____ _________ __________ _______ ________ __________ __________ _________ __________.
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5 MeV neutron is scattered through an angle of 45 degrees in a collision with nucleus. Calculate the energy of scattered neutrons and energy of the recoiling nucleus.
State Fick's law. Discuss its importance in neutron transport /diffusion. Write the assumptions used to derive Fick's law and hence derive its expression.
Show that the average cosine of scattering angle in the LAB system () is given by
, where A is the mass number of nucleus. Is this relation applies to hydrogen?
Describe the Fermi-age theory and derive Fermi-age approximation of slowing down equation for a weak absorbing medium. Discuss the S-G approximation.
What are (i) initial and boundary conditions, and (ii) Interface boundary conditions?
What do you understand by constant cross-section approximation? Derive the steady state equation for a plane geometry. Also write the transport equation for a spherical geometry.
What are