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However, it has been decided not to put this data into the SysML model yet, because the Wikipedia page on Proton gives the mean charge radius, which can't be directly compared with the mean square radius. For now it suffices to introduce an indication
isFiniteRadius for any
Particle, which has been redefined in
CompositeParticle to be 'true'.
We are told that:
So the «undergoes» Dependency to
Electromagnetism is qualified for now by naming it 'magnetism only'.
To match the Wikipedia units, a custom ValueType
MagneticMoment has been created with custom Unit
joule per tesla and symbol 'J/T'. (The tool's ISO-80000 has a ValueType
magnetic area moment in equivalent
ampere square metre units.)
Earlier in the trail a placeholder value property
lifetime:ParticleLifetime was identified; this has now been renamed to
meanFreeLifetime:ParticleLifetime to better correspond with:
And it turns out after all that only free protons are definitely stable:
Some information about
BetaDecay has been collected, but it's not the current focus.