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virgileso
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Where can I get reliable information on the cross section of various substances: boric acid, O2, Uranium, water, etc?
A thermal cross section is a measure of the likelihood of a particle interacting with a thermal neutron at a specific energy level. It is typically used in nuclear physics to describe the probability of a reaction occurring between a neutron and a specific material.
The thermal cross section of a substance is typically determined through experiments or simulations that measure the interaction between thermal neutrons and the substance. This data is then used to calculate the cross section value.
The thermal cross section of boric acid is approximately 600 barns (1 barn = 10^-24 cm^2). This value may vary slightly depending on the energy level of the thermal neutron.
The thermal cross section of oxygen is relatively low at 0.0002 barns. This is due to its relatively low atomic number and the fact that it does not readily absorb thermal neutrons.
Yes, the thermal cross section of a substance can vary depending on factors such as temperature, pressure, and the energy level of the neutron. It can also vary for different isotopes of the same element.