Helium-3 (3 He see also helion) is a light, stable isotope of helium with two protons and one neutron (the most common isotope, helium-4, having two protons and two neutrons in contrast).Other than protium (ordinary hydrogen), helium-3 is the only stable isotope of any element with more protons than neutrons. Helium-3 was discovered in 1939. Helium-3 occurs …

Although there are nine known isotopes of helium (2 He) (standard atomic weight: 4.002 602 (2)), only helium-3 (3 He) and helium-4 (4 He) are stable. All radioisotopes are short-lived, the longest-lived being 6 He with a half-life of 806.92(24) milliseconds.The least stable is 10 He, with a half-life of 260(40) yoctoseconds (2.6(4) × 10 −22 s), although it is possible that 2

Helium-3 (3 He) ist neben Helium-4 eines der beiden stabilen Isotope des Heliums.Sein Atomkern enthält zwei Protonen und ein Neutron.. Hauptanwendungsgebiet von Helium-3 ist die Tieftemperaturforschung: In Mischungskryostaten werden durch Nutzung von Helium-3 und Helium-4 Temperaturen von nur wenigen tausendstel Kelvin über dem absoluten Nullpunkt …

table Général Symbole 3 2 He 1 Neutrons 1 Protons 2 Données physiques Présence naturelle 0,000134(3) % Demi-vie Stable Masse atomique 3,01602932197(6) u Spin 1/2+ Excès d'énergie 14 931,218 88 ± 0,000 06 keV Énergie de liaison par nucléon 2 573 ± 0 keV modifier L’ hélium 3 , noté 3 He , est l' isotope de l' hélium dont le nombre de masse est égal à 3: son noyau …

The Moon bears substantial natural resources which could be exploited in the future. Potential lunar resources may encompass processable materials such as volatiles and minerals, along with geologic structures such as lava tubes that together, might enable lunar habitation.The use of resources on the Moon may provide a means of reducing the cost and risk of lunar exploration …

Liquid helium is a physical state of helium at very low temperatures at standard atmospheric pressures.Liquid helium may show superfluidity.. At standard pressure, the chemical element helium exists in a liquid form only at the extremely low temperature of −269 °C (−452.20 °F; 4.15 K). Its boiling point and critical point depend on which isotope of helium is present: the common …

Helium-3 (též helium 3, značka 3 He, někdy nazývané také tralfium) je lehčí a mnohem méně běžný izotop helia, tvoří asi 0,000 137 % helia v přírodě.Jeho jádro se skládá z 2 protonů a 1 neutronu.Jedná se, spolu s vodíkem-1, o jeden ze dvou stabilních nuklidů, které mají v jádru více protonů než neutronů.

ヘリウム3（ヘリウムさん、英: helium-3 ）は、ヘリウムの同位体の一つである。. ヘリウム3(3 He)の原子核は、陽子2個と中性子1個からなり、通常のヘリウム原子(4 He)より軽い安定同位体である。ヘリウム3は核融合のD-D反応、陽子-陽子連鎖反応の際に発生する。 また三重水素の娘核種であり、 3 Hの ...

The Helium-3 Shortage: Supply, Demand, and Options for Congress Архивная копия от 24 сентября 2015 на Wayback Machine // Congressional Research Service, December 22, 2010 (англ.). Примечания

Superfluidity was discovered in helium-4 by Pyotr Kapitsa and independently by John F. Allen and Don Misener in 1937. It has since been described through phenomenology and microscopic theories. In liquid helium-4, the superfluidity occurs at far higher temperatures than it does in helium-3.Each atom of helium-4 is a boson particle, by virtue of its integer spin.