Task: Text Categorization
Input (English): Bruce Cork discovered the antiparticle partner for this particle in 1956, 24 years after James Chadwick discovered this particle itself in 1932. A free version of this particle has a mean lifetime of just under 15 minutes. A flavor change via a W boson from a down quark to an up quark causes this particle to decay, during which it produces an electron antineutrino, an electron, and another type of nucleon. The number of this particle in an atom determines the isotope of an element. For 10 points, identify this subatomic particle, slightly heavier than the proton, that has zero charge.
Output (English): Science