What is a significant advantage of surrounding a reactor core with a reflector?

Surrounding a reactor core with a reflector enhances the power distribution within the core by reflecting neutrons back into the core region. This mechanism effectively increases the number of neutrons available for sustaining the fission reactions occurring in the reactor. By utilizing a reflector, neutrons that would otherwise escape the core are redirected, allowing for improved utilization of the fuel and achieving a more even power profile. This results in a greater efficiency of the reactor, as it maximizes the fission process and can help in achieving better thermal performance. The improved power distribution also contributes to more stable and optimized reactor operation, which is a key consideration in reactor design and operation.