Re: Dark matter is the core of stars (minus hydrogen cover)

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