What do the numbers in square brackets after particle name mean？

Particles, Track, Event, Run and Biasing
1

When I use GetParticleDefinition() and GetParticleName() to aquire the name of particle. I found some isotope was followed by a square bracket and a number. such as Fe55[931.290]. So What do the numbers in square brackets mean？

3

Excited state of Fe55, of 931 keV

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4

Thanks maire for correcting. Yes this is right.
Regards

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