Packet 9: Tossup 14

Pohl et al. measured a smaller than expected value for this particle’s radius when observing a system of it (15[1])and a muon, (15[1])causing its “radius (15[1])puzzle.” (15[2])An earlier experiment involving a muon beam found that this particle’s spin was greater than the total (-5[1])spin of its components in its namesake (15[1])“spin crisis.” (15[1])This particle is hypothesized to decay (15[1])into a positron (15[1])and neutral pion on the order of (*) 10 to the 34 years. The Coulombic repulsion between these particles (-5[1])causes isotopes with too many of them to be (-5[1])unstable. (-5[1])This particle consists (-5[2])of two up quarks (10[2])and one down quark. For 10 points, (-5[1])name (10[2])this positively (10[1])charged (10[2])subatomic (10[4])particle. ■END■ (10[6])

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