Round 9: Tossup 14

Pohl et al. measured a smaller than expected value for this particle’s radius when observing a system of it and a muon, causing its “radius puzzle.” An earlier experiment involving a muon beam found that this particle’s spin was greater than the total spin of its components in its namesake “spin crisis.” This particle is hypothesized to decay (15[1])into a positron and neutral pion on the order of (*) 10 to the 34 years. The Coulombic repulsion between these particles causes isotopes with too many of them to be unstable. (-5[1])This particle consists of two up quarks and one down quark. For 10 points, (-5[1])name (10[1])this positively charged subatomic particle. ■END■ (10[3])

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