Helium-3 and protium (ordinary hydrogen) are the only stable nuclides with more protons than neutrons. It was discovered in 1939. Helium-3 occurs as a primordial nuclide, escaping from Earth's crust into its atmosphere and into outer space over millions of years.

Helium-3, also written as 3 He, is a light isotope of helium having 2 protons but only one neutron and an atomic mass of 3. The existence of Helium-3 was first proposed in 1934 by the Australian nuclear physicist Mark Oliphant.

Helium-3 is a stable isotope of the chemical element helium. The atomic nucleus of the nuclide consists of the element-specific 2 protons and a neutron, which results in the mass number 3. He-3 is - besides hydrogen-1 - the only stable isotope of an element with more protons than neutrons.

2024年3月13日 · Helium-3 is a stable isotope of helium with two protons and one neutron. It is produced by fusion in the Sun and transported by the Solar wind. However, Earth's magnetosphere...

2021年10月14日 · Helium-3 atom is the stable isotope of helium with relative atomic mass 3.016029. The least abundant (0.000137 atom percent) isotope of naturally occurring helium. It contains a helion. Helium He-3 is under investigation in clinical trial NCT00846014 (Asthma Exacerbation and Helium-3 MRI).

This paper describes various methods and designs specifically proposed for mining helium-3, and summarizes the methods, results and potential implications of recent research on helium extraction from lunar regolith simulant.

Helium-3 (3 He) is a rare stable isotope of helium and is commercially available in isotopically separated form.

DOE projects its helium-3 (He-3) recovery and inventory management activities will meet important Federal demands for several decades to come. The sole source of DOE's He-3 comes from National Nuclear Security Administration (NNSA) Defense Program mission operations.

Helium-3 (He-3) is a light, non-radioactive isotope of helium with two protons and one neutron, which is rare on Earth; it is sought after for use in nuclear fusion research.

2019年10月3日 · Helium-3 is lighter of two stable isotopes of helium. The chemical formula of helium-3 – 3He. A kernel of helium-3 (Helion) consists of two protons and one neutron, in contrast to helium -4 (4He), consisting of two protons and two neutrons. The last (4He) is more common: it is, in fact, have 99,99986 % of helium on Earth.