To be effective, moderator materials must thus contain light elements with atomic nuclei that tend to scatter neutrons on impact rather than absorb them.
42.
They were not too worried about the plutonium itself; their main concern was the issue Chadwick had raised about interaction with light element impurities.
43.
This has several applications in physical cosmology, including the formation of the light elements in big bang nucleosynthesis, the production of dark matter and baryogenesis.
44.
It is especially useful to profile light elements such as H, B, C, N, and O in the presence of heavier material background.
45.
She was known for her experimental work in nuclear spectroscopy of light elements, and for her annual reviews of the energy levels of light atomic nuclei.
46.
As the control system of the light elements can suffer technical problems during long-lasting cold weather, the installation is shut down in such weather.
47.
If the core temperature exceeds about 2.5 million degrees, light elements begin fusing together to release energy and to turn the object into a star.
48.
Among light elements that absorb thermal neutrons, 6 Li and 10 B appear as potential spacecraft structural materials which serve both for mechanical reinforcement and radiation protection.
49.
Complementary neutron crystallography techniques are used to identify the positions of hydrogen atoms, since X-rays only interact very weakly with light elements such as hydrogen.
50.
As more cosmological data began to be collected, cosmologists began to realize that the Big Bang correctly predicted the abundance of light elements observed in the cosmos.
