Question
The GRAMS project plans to launch a liquid argon time projection chamber into space to detect these particles in the MeV range, potentially from sources like neutron star mergers and blazars. For 10 points each:
[10h] Name these particles previously detected with Compton telescopes. In time projection chambers, the tracks left by these particles are distinguished by a gap between the interaction vertex and the electromagnetic shower.
ANSWER: gamma rays [prompt on photons by asking “what are they known as in the MeV energy scale?”]
[10m] The VERITAS array in Arizona can detect atmospheric gamma rays by their emission of this phenomenon. This phenomenon is responsible for the characteristic blue glow of a nuclear reactor core.
ANSWER: Cherenkov light [or Cherenkov radiation]
[10e] The Fermi Telescope in low Earth orbit can detect and characterize gamma-ray bursts by observing their pair production into electrons and these antiparticles.
ANSWER: positrons [or e-plus]
<BW, Physics>
Summary
| 2024 ARCADIA at BU | 2024-12-06 | Y | 8 | 16.25 | 100% | 63% | 0% |
| 2024 ARCADIA at Duke | 2024-12-06 | Y | 2 | 15.00 | 100% | 50% | 0% |
| 2024 ARCADIA at Missouri S&T | 2024-12-06 | Y | 2 | 80.00 | 200% | 400% | 200% |
| 2024 ARCADIA Online | 2025-05-17 | Y | 5 | 20.00 | 100% | 100% | 0% |
| 2024 ARCADIA at Penn State | 2024-12-06 | Y | 2 | 15.00 | 100% | 50% | 0% |
| 2024 ARCADIA at Florida Tech | 2024-12-06 | Y | 4 | 10.00 | 50% | 50% | 0% |
| 2024 ARCADIA at UC Berkeley | 2024-12-06 | Y | 2 | 20.00 | 100% | 100% | 0% |
| 2024 ARCADIA at Waterloo | 2024-11-09 | Y | 6 | 15.00 | 67% | 83% | 0% |
| 2024 ARCADIA at GT | 2024-12-06 | Y | 5 | 18.00 | 100% | 80% | 0% |
| 2024 ARCADIA at Illinois | 2024-11-09 | Y | 4 | 20.00 | 100% | 100% | 0% |
| 2024 ARCADIA at Warwick | 2024-12-06 | Y | 5 | 16.00 | 100% | 60% | 0% |
| 2024 ARCADIA at Claremont | 2024-11-02 | Y | 3 | 20.00 | 100% | 100% | 0% |
Data
| MIT | Tufts A | 0 | 10 | 10 | 20 |
| Yale | Tufts B | 0 | 10 | 10 | 20 |
| Bowdoin C | BU | 0 | 10 | 10 | 20 |
| Amherst | Boston College A | 0 | 0 | 10 | 10 |
| Clark Wilson | Boston College B | 0 | 10 | 10 | 20 |
| Bowdoin A | Bowdoin B | 0 | 0 | 10 | 10 |
| Brandeis A | Clark House | 0 | 0 | 10 | 10 |
| Brandeis B | Harvard | 0 | 10 | 10 | 20 |