# Talk:Isotopes of hydrogen

WikiProject Elements / Isotopes  (Rated List-class, Low-importance)
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This article is part of Wikipedia:Wikiproject Isotopes. Please keep style and phrasings consistent across the set of pages. For later reference and improved reliability, data from all considered multiple sources is collected here. References are denoted by these letters:

• (A) G. Audi, O. Bersillon, J. Blachot, A.H. Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003). — Where this source indicates a speculative value, the # mark is also applied to values with weak assignment arguments from other sources, if grouped together. An asterisk after the A means that a comment of some importance may be available in the original.
• (B) National Nuclear Data Center, Brookhaven National Laboratory, information extracted from the NuDat 2.1 database. (Retrieved Sept. 2005, from the code of the popup boxes).
• (C) David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes. — The CRC uses rounded numbers with implied uncertainties, where this concurs with the range of another source it is treated as exactly equal in this comparison.
• (D) More specific level data from reference B's Levels and Gammas database.
• (E) Same as B but excitation energy replaced with that from D.
• (F) The references given for H4 are dead and provide no information. I have had multiple discussions with D.R. Tilley and H.R. Weller. Authors of Energy Levels of Light Nuclei A = 4. "ground state" at the nndc is the lowest energy lever at which something has been seen. For H-4 that is 4.6MeV after an 8MeV Pion hits Li-7. I will leave the final edit to someone with time to do so. --begining the elemination of carbon from our energy diet. (talk) 18:52, 12 March 2015 (UTC)
  Z   N refs symbol   half-life                      spin              excitation energy
1   0 AB  |H-1     |STABLE                        |1/2+
1   0 C   |H-1     |>2.8E+23 a                    |1/2+
1   1 ABC |H-2     |STABLE                        |1+
1   2 AB  |H-3     |12.32(2) a                    |1/2+
1   2 C   |H-3     |12.33 a                       |1/2+
1   3 A   |H-4     |139(10)E-24 s [3.28(23)MeV]   |2-
1   3 B   |H-4     |[4.6(9) MeV]                  |2-
1   3 C   |H-4     |[~3 MeV]                      |2-
1   4 A*  |H-5     |>910E-24 s [<0.5 MeV]         |(1/2+)
1   4 B   |H-5     |[5.7 MeV]                     |
1   4 C   |H-5     |[1.9(4) MeV]                  |
1   5 A   |H-6     |290(70)E-24 s                 |2-#
1   5 BC  |H-6     |[1.6(4) MeV]                  |(2-)
1   6 A   |H-7     |23(6)E-24# s [20(5)# MeV]     |1/2+#
1   6 B   |H-7     |29(7)E-23 y [sic]             |


Femto 16:34, 19 November 2005 (UTC)

## Half-lives

Some of the half-lives in the article were of dubious precision. I adjusted them according to above sources, until someone finds more specialized references. Femto 16:34, 19 November 2005 (UTC)

Also the half-lives are different than those on the pages for the specific isotopes, don't know which are the correct ones, but it has to be changed at either the specific pages or here. http://en.wikipedia.org/wiki/Hydrogen-5 http://en.wikipedia.org/wiki/Hydrogen-4

## Exotic atoms

Why exactly is muonium mentioned in this article, and why only muonium and not also some other exotic atoms like positronium? —Preceding unsigned comment added by 84.194.236.251 (talk) 16:31, 15 September 2007 (UTC)

I also wonder why Muonium is mentioned here. Does Muonium have some special connection to isotopes of hydrogen?—Preceding unsigned comment added by 68.230.161.164 (talkcontribs) 20:29, 10 November 2007

Does Tritium decay by Beta - or Beta +? Statue2 11:55, 8 October 2007 (UTC)

Where is Antihydrogen?Gordomono (talk) 05:00, 8 April 2009 (UTC)

Good suggestion. I have just added anti-H in a new subsection, with a link to the detailed main article. Dirac66 (talk) 16:11, 8 April 2009 (UTC)

## Half-life of the proton?

The table says that the half-life of the 1H atom is >2.8·1023 years. Does this refer to the proton decay? If yes, then the half-life should be updated since it is most probably >1032 years. If not, then it should be stated while a proton with a bound electron might have a shorter half-life than a naked proton. Or, if it simply indicates a lower border given be the experiments in the source, then this should also be made clear. Since the CRC Handbook Online is not a free source (you need a user login that seems to be given to selected people only) no one can expect the reader to retrieve the original source.--SiriusB (talk) 14:07, 23 June 2008 (UTC)

## Ions of Hydrogen-1?

Is it possible for the following to exist: A Hydrogen-1 atom that has become an ion by having one less electron? I.E. a free proton? Or does an atom always require at least one electron? What about a proton and two electrons? 87.194.8.35 (talk) 19:57, 27 October 2009 (UTC)

Yes. Both H+ and H- ions exist. XinaNicole (talk) 08:04, 25 May 2011 (UTC)

## Merged H-5

It was a duplicate. Lanthanum-138 (talk) 04:37, 3 February 2011 (UTC)

## Hydrogen 6 Decay branches

All references to this indicate n and 3 n decay with 1 resource showing a 50/50 split in probability. I have not been able to find any evidence of a 4 n decay path. if anyone can cite for this it would be most appreciated. 74.202.23.198 (talk) 18:12, 22 July 2011 (UTC)

It's from the NUBASE97 paper, [1], pp. 14-15:

In the very special case of 6H we mention as possible decay channels 3 neutrons and 4 neutrons emissions. The reason is that, based on the observed mass values, both its Sn and S2n separation energies are positive, which makes it stable against 1 neutron and 2 neutron emission, but not against 3n or 4n emission. 6H decays with a half-life of 320(60) yoctoseconds. Its mass value is derived from two 7Li(7Li,8B) experiments and one 9Be(11B,14O). If this mass value is confirmed, 6H would be a unique laboratory for searching for simultaneous 3n or 4n emission.

But in NUBASE03 [2], the mass of 5H has been revised downwards, so according to this database, Sn(6H)<0. Spacepotato (talk) 02:20, 23 July 2011 (UTC)

## Lose the column "decay energy"

You should add the column "decay energy" in the article "Isotopes of any chemical element! — Preceding unsigned comment added by 59.126.202.81 (talk) 16:21, 22 July 2012 (UTC)

## too sharp?

Why is there a # sign in the 7H row in the last table? ("2.3(6)×10−23 s#") --TheAnarcat (talk) 18:23, 23 April 2013 (UTC)

See Notes (last section of article). The second note reads "Values marked # are not purely derived from experimental data, but at least partly from systematic trends." Dirac66 (talk) 18:49, 23 April 2013 (UTC)

## Decay Chains Section

I would like to create a section on this article showing the complete decay chains of the isotopes (excluding theoretical proton decay for 1H and 2H). The basic draft is:

${\displaystyle \mathrm {{}_{1}^{3}H} \rightarrow \mathrm {{}_{2}^{3}He} +{{}_{-1}^{0}e}}$
${\displaystyle \mathrm {{}_{1}^{4}H} \rightarrow \mathrm {{}_{1}^{3}H} +{{}_{0}^{1}n}\rightarrow \mathrm {{}_{2}^{3}He} +{{}_{-1}^{0}e}}$
${\displaystyle \mathrm {{}_{1}^{5}H} \rightarrow \mathrm {{}_{1}^{3}H} +2{{}_{0}^{1}n}\rightarrow \mathrm {{}_{2}^{3}He} +{{}_{-1}^{0}e}}$
${\displaystyle \mathrm {{}_{1}^{6}H} \rightarrow \mathrm {{}_{1}^{3}H} +3{{}_{0}^{1}n}\rightarrow \mathrm {{}_{2}^{3}He} +{{}_{-1}^{0}e}}$
${\displaystyle \mathrm {{}_{1}^{6}H} \rightarrow \mathrm {{}_{1}^{2}H} +4{{}_{0}^{1}n}}$
${\displaystyle \mathrm {{}_{1}^{7}H} \rightarrow \mathrm {{}_{1}^{3}H} +4{{}_{0}^{1}n}\rightarrow \mathrm {{}_{2}^{3}He} +{{}_{-1}^{0}e}}$

Jacob S-589 (talk) 23:54, 15 June 2014 (UTC)

## Unbound isotopes

Many of the really heavy neutron-leaking isotopes of the light elements are actually unbound. Examples are 4–7H, 5He, 7He, 9–10He, 10Li, 12–13Li, 13Be, 15–16Be, 16B, 18B, 21C, 25–26O, 28F, 30F, 33Ne, 36Na, 39Mg. Double sharp (talk) 09:12, 26 June 2016 (UTC)

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