A free neutron outside a nucleus is not stable. It undergoes beta decay at a probability. Over time, the number of free neutrons decreases exponentially at a time constant, which is called the neutron ...

Additive manufacturing techniques like fused deposition modeling, aka 3D printing, are often used for rapid prototyping. Another advantage is that it can create shapes that are too complex to be made ...

Compact and efficient: prototype of a working, pocket-sized neutron detector made with semiconductor rich in lithium-6. (Courtesy: Northwestern University/Argonne National Laboratory) A semiconductor ...