The Moon's cosmic ray shadow, as seen in secondary muons generated by cosmic rays in the atmosphere, and detected 700 meters below ground, at the Soudan II detector | |
Composition | Elementary particle |
---|---|
Statistics | Fermionic |
Generation | Second |
Interactions | Gravity, Electromagnetic, Weak |
Symbol | μ− |
Antiparticle | Antimuon ( μ+ ) |
Discovered | Carl D. Anderson, Seth Neddermeyer (1936) |
Mass | 105.6583745(24) MeV/c2[1] |
Mean lifetime | 2.1969811(22)×10−6s[2][3] |
Decays into | e− , ν e, ν μ[3] (most common) |
Electric charge | −1 e |
Color charge | None |
Spin | 1/2 |
Weak isospin | LH: −1/2, RH: 0 |
Weak hypercharge | LH: −1, RH: −2 |
Unsolved problem in physics: What is the true charge radius of the proton? (more unsolved problems in physics) |
The Moon's cosmic ray shadow, as seen in secondary muons generated by cosmic rays in the atmosphere, and detected 700 meters below ground, at the Soudan II detector | |
Composition | Elementary particle |
---|---|
Statistics | Fermionic |
Generation | Second |
Interactions | Gravity, Electromagnetic, Weak |
Symbol | μ− |
Antiparticle | Antimuon ( μ+ ) |
Discovered | Carl D. Anderson, Seth Neddermeyer (1936) |
Mass | 105.6583745(24) MeV/c2[1] |
Mean lifetime | 2.1969811(22)×10−6s[2][3] |
Decays into | e− , ν e, ν μ[3] (most common) |
Electric charge | −1 e |
Color charge | None |
Spin | 1/2 |
Weak isospin | LH: −1/2, RH: 0 |
Weak hypercharge | LH: −1, RH: −2 |
Unsolved problem in physics: What is the true charge radius of the proton? (more unsolved problems in physics) |