Uranium isotopes with m in superscript

  • #1
nomadreid
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On the page https://en.wikipedia.org/wiki/Isotopes_of_uranium, some of the superscripts have, besides the atomic number, also an "m". For example, besides the usual isotope 234U with spin 0+, there is also the isotope 234mU (with nuclear spin 6-). What is this "m"?

While I am at it, what is the "+" next to the 0? +0 = -0, no? (It can't be the charge, given the "6-" for the other one.)
 

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  • #2
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m is abbreviation for "metastable". This signifies "nuclear isomers" - nuclear states which have higher energy than some other state of same neutron and proton number and relatively long half-life.
 
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  • #3
nomadreid
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thank you very much, snorkack. That completely answers the first question.
 
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While I am at it, what is the "+" next to the 0? +0 = -0, no? (It can't be the charge, given the "6-" for the other one.)
It is the parity. It is not a sign for the spin.
 
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  • #5
nomadreid
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Thanks very much, mfb. That completely answers the second question.
Super! both questions wonderfully answered.
 

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