Another term for isomer (sense 2).
- In 2002, the deputy undersecretary of defense for science and technology asked the Institute for Defense Analyses to examine the evidence and prospects for controlled extraction of energy from the nuclear isomers.
- Scientists have known for many years that the nuclei of some elements, such as hafnium, can exist in a high-energy state, or nuclear isomer, that slowly decays to a low-energy state by emitting gamma rays.
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