Helion (chemistry): Difference between revisions
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A '''helion''' (symbol ''h'') is a [[portmanteau]] for the naked [[Atomic nucleus|nucleus]] of [[helium]], a doubly positively charged ''<u>hel</u>ium <u>ion</u>''. In practice, ''helion'' refers specifically to the nucleus of the [[helium-3]] isotope, consisting of two [[protons]] and one [[neutron]]. The nucleus of the other [[stable isotope]] of helium, [[helium-4]] isotope, which consists of two protons and two neutrons, is specifically called an [[alpha particle]]. |
A '''helion''' (symbol ''h'') is a [[portmanteau]] for the naked [[Atomic nucleus|nucleus]] of [[helium]], a doubly positively charged ''<u>hel</u>ium <u>ion</u>''. In practice, ''helion'' refers specifically to the nucleus of the [[helium-3]] isotope, consisting of two [[protons]] and one [[neutron]]. The nucleus of the other [[stable isotope]] of helium, [[helium-4]] isotope, which consists of two protons and two neutrons, is specifically called an [[alpha particle]]. |
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This particle is |
This particle is the daughter product in the beta-minus [[radioactive decay|decay]] of [[tritium]], an isotope of [[hydrogen]]: |
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Revision as of 22:38, 7 June 2022
A helion (symbol h) is a portmanteau for the naked nucleus of helium, a doubly positively charged helium ion. In practice, helion refers specifically to the nucleus of the helium-3 isotope, consisting of two protons and one neutron. The nucleus of the other stable isotope of helium, helium-4 isotope, which consists of two protons and two neutrons, is specifically called an alpha particle.
This particle is the daughter product in the beta-minus decay of tritium, an isotope of hydrogen:
CODATA reports the mass of a helion particle as mh = 5.006412700(62)×10−27 kg = 3.01493224673(12) Da.[1]
Helions are intermediate products in the proton–proton chain reaction in stellar fusion.
An antihelion is the antiparticle of a helion, consisting of two antiprotons and an antineutron.
References
- ^ See page 60 (Table 33) of Mohr, Peter J.; Newell, David B.; Taylor, Barry N. (2016). "CODATA recommended values of the fundamental physical constants: 2014". Rev. Mod. Phys. 88 (3): 1–73. arXiv:1203.5425. doi:10.1103/RevModPhys.88.035009. S2CID 1115862.
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