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James Chadwick.

In 1935 he received the Nobel Prize for his discovery of neutrons.

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12y ago

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What is the neutron absorption cross section of an atom?

The neutron absorption cross section of an atom is the size of the target presented by that atom to an incoming neutron. Let's look at a couple of things and we'll get to it. Ready? Let's go. There is a funny group of rules associated with the way an atomic nucleus reacts to an incoming neutron. It isn't necessarily like breaking a rack of billiard balls like in so many science shows. It's more like the neutron manages to press up against the nucleus and the nucleus captures it. Then what happens, happens. One of the concepts to be considered is the energy of the incoming neutron. How fast is it going? Faster isn't necessarily better for increasing the probability of capture. It usually isn't. Another factor is the size of the target that a given nucleus presents to that neutron. We call that a neutron absorption cross section, and it's measured in barns. (Yes, like the broad side of a barn, as in hitting the broad side of a barn. And who said physicists weren't funny and couldn't make jokes!) There are tables to look this stuff up on because each given isotope of each given element has a given neutron capture cross section. That makes things challenging. And the actual cross section is different for different energies of neutrons. That ups the challenge for investigators even more.


Which has the least amount of mass a molecule an atom an electron a neutron a proton?

The mass of an electron is the least among the options given here.


Who is given credit for today's current arrangement of the elements?

Patricia Nemeth


What is the name of jimmy neutron's mom?

Judy neutron


What is atomic mass A and neutron number N for given atom?

Atomic mass is the number of protons and neutrons that make up an atom. The neutron number is only the number of neutrons present in the atom. This can be found by subtracting the number of protons from the atomic mass.