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From: Jim Pennino <jimp@gonzo.specsol.net>
Newsgroups: sci.physics
Subject: Re: Dark matter is the core of stars (minus hydrogen cover)
Date: Sun, 29 Jun 2025 15:02:25 -0700
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William Hyde <wthyde1953@gmail.com> wrote:
> Jim Pennino wrote:
> 
>> 
>> Sorry crackpot, there is no such thing as helium-2.
> 
> All kinds of weird isotopes have been created in the lab, though they 
> generally have tiny half lives.  Hydrogen-7, for example, has been 
> observed and has a half life of about ten to the minus twenty two seconds.
> 
> Helium-2 may have been observed, according to several experiments done 
> in this century.  But nobody has claimed certainty yet.

IMHO nobody ever will.

> However, theoretical calculations give it a very small half life.  How 
> small they are not sure, but much less than a billionth of a second. 
> This is very short compared to Helium-6 or Helium-8.
> 
> Not surprising, because helium-2 actually has a negative binding energy.
> 
> There is, apparently, a helium-10, also with a tiny (but in this case 
> measured) half life.  It can only exist for even that time because this 
> number of nucleons forms a complete shell, adding stability.  Helium-9, 
> on the other hand, has never as far as I know been observed, though it 
> must form in the kind of process that results in helium-10.

Helium-3 and helium-4 are the only stable isotopes. All the other
isotopes have half lives of less than a second.

Helium-2 appears to only exist at two places in a series of nuclear
reactions and dissapears when the reactions are complete.

> 
> Of course, none of this supports the crackpottery you were responding to.
> 
> 
> William Hyde
> 

-- 
penninojim@yahoo.com