• Support PF! Buy your school textbooks, materials and every day products Here!

Why there is no isotope of hydrogen with an atomic weight of four?

  • Thread starter estrella
  • Start date
  • #1
6
0

Homework Statement





Homework Equations


why there is no isotope of hydrogen with an atomic weight of four?


The Attempt at a Solution


i find that such an isotope would have an isotopic spin state of 1/2 |2-1> + 3/2 |1 -1>
is there a reason for this state to not exist?
 
Last edited:

Answers and Replies

  • #2
21
0
Do you mean hydrogen with a nucleus of 1 proton and 3 neutrons?

Tritium is a radioactive isotope of hydrogen with 1 proton and 2 neutrons. It usually decays via
[tex]
H^3 -> (He^3)^+ + e^- + \nu^-
[/tex]

Perhaps [tex]
H^4
[/tex] would be unstable due to internuclear forces.

jsc
 
  • #3
6
0
yes. I want to explain why a nucleus of 1 proton and 3 neutrons does not exist by using the isospin.
so i thought i should calculate the isospin of the combination n+n, then the combination p+n and then combine the results to find the isospin of the nucleus.
i assume that i sould find an unreasonable result to explain why it doesn't exist.
Any idea?
 
  • #4
reilly
Science Advisor
1,075
1
There are no restrictions, other than that supplied by the Pauli Principle, on isospins of any set of protons and neutrons. Why would there be?

Why would Nature allow Helium 4, but not Hydrogen 4?
Regards,
Reilly Atkinson
 
  • #5
6
0
i did my research on the subject and you are wright reilly.
thanks!
 

Related Threads for: Why there is no isotope of hydrogen with an atomic weight of four?

Replies
5
Views
3K
Replies
1
Views
2K
Replies
3
Views
2K
Replies
1
Views
4K
Replies
4
Views
4K
  • Last Post
Replies
8
Views
3K
  • Last Post
Replies
6
Views
2K
Replies
16
Views
2K
Top