Question
The Fermi Gamma-Ray telescope sometimes sees thunderstorms output gamma radiation at 511 kiloelectronvolts. Answer the following about this phenomenon, for 10 points each.
[10e] The signal is produced when a positron, a particle of this class, is created by lightning and then annihilates with an electron. Particles of this class are generally the same as ordinary particles but have opposite charges.
ANSWER: antimatter [accept antiparticle or antilepton or antielectron]
[10h] For a particle and its antiparticle to be distinct, they must be excitations of a field with this property. When quantizing a scalar field with this mathematical property, the Fourier coefficients for positive and negative frequencies become distinct creation and annihilation operators.
ANSWER: complex-valued [or complex scalar field]
[10m] The photons that Fermi detects are their own antiparticles. This neutral, massive Standard Model boson is also its own antiparticle, but, unlike the photon, it is unstable and mediates the weak force.
ANSWER: Z boson [or Z0; accept Z particle]
<RA, Physics>
Summary
| 2023 ARCADIA at Duke | Emory, Duke, Yale | Y | 4 | 10.00 | 100% | 0% | 0% |
| 2023 ARCADIA at Maryland | Maryland, Online | Y | 2 | 0.00 | 0% | 0% | 0% |
| 2023 ARCADIA at Ohio State | Ohio State, Texas | Y | 3 | 10.00 | 100% | 0% | 0% |
| 2023 ARCADIA Online | Maryland, Online | Y | 3 | 16.67 | 100% | 67% | 0% |
| 2023 ARCADIA at Texas | Ohio State, Texas | Y | 3 | 13.33 | 67% | 67% | 0% |
| 2023 ARCADIA at UC Berkeley | Premiere | N | 2 | 20.00 | 100% | 100% | 0% |
| 2023 ARCADIA at Carleton University | Premiere | N | 3 | 10.00 | 67% | 33% | 0% |
| 2023 ARCADIA at Claremont Colleges | Premiere | N | 1 | 10.00 | 100% | 0% | 0% |
| 2023 ARCADIA at Imperial | Imperial | N | 5 | 10.00 | 80% | 20% | 0% |
| 2023 ARCADIA at Indiana | Premiere | N | 5 | 10.00 | 80% | 20% | 0% |
| 2023 ARCADIA at RIT | Premiere | N | 2 | 15.00 | 100% | 50% | 0% |
| 2023 ARCADIA at WUSTL | Premiere | N | 3 | 6.67 | 67% | 0% | 0% |
Data
| Duke | North Carolina B | 10 | 0 | 0 | 10 |
| South Carolina A | James Madison A | 10 | 0 | 0 | 10 |
| George Washington B | Maryland A | 0 | 0 | 0 | 0 |
| Maryland B | Johns Hopkins | 0 | 0 | 0 | 0 |
| Kenyon B | Michigan B | 10 | 0 | 0 | 10 |
| Michigan A | Ohio State A | 10 | 0 | 0 | 10 |
| Ohio State B | Kenyon A | 10 | 0 | 0 | 10 |
| Arizona State | Boston College | 10 | 0 | 10 | 20 |
| Farrellmagnetism | Zen and the Art of Buzzing | 10 | 0 | 10 | 20 |
| Ganon Evans Fan Club | MSU A and Friend | 10 | 0 | 0 | 10 |
| NC State | James Madison B | 10 | 0 | 0 | 10 |
| HCC | tag magnet: taylor's version | 0 | 0 | 0 | 0 |
| Texas A | TAMU | 10 | 0 | 10 | 20 |
| Texas B | Texas C | 10 | 0 | 10 | 20 |
| North Carolina A | South Carolina B | 10 | 0 | 0 | 10 |