mass_energy
- plasmapy.particles.nuclear.mass_energy(particle: Particle, mass_numb: Integral | None = None) Quantity[source]
Return a particle’s mass energy. If the particle is an isotope or nuclide, return the nuclear mass energy only.
- Parameters:
particle (particle-like) – A Particle object, a string representing an element or isotope, or an integer representing the atomic number of an element.
mass_numb (integer, optional) – The mass number of an isotope, which is required if and only if the first argument can only be used to determine the element and not the isotope.
- Returns:
mass_energy – The mass energy of the particle (or, in the case of an isotope, its nuclide) in units of joules.
- Return type:
- Raises:
InvalidParticleError – If the inputs do not correspond to a valid particle.
ParticleError – If the inputs do not correspond to a valid isotope or nucleon.
Examples
>>> mass_energy("He-4") <Quantity 5.9719e-10 J>