Astrophysics
(Near future plan) Yemi Underground Nuclear Astrophysics @ Korea (YUNA@K)
- Nuclear cross section measurement of the nuclear reactions of interest in astrophysics
- Yemilab provides a less muon (1/43,000 times) and neutron (1/200 times) than above ground.
| Beam | E(MeV) | C(mA) | Charge |
|---|---|---|---|
| ¹H | 6 | 50 | +1 |
| ⁴He | 9 | 10 | +2 |
| ¹⁰B | 15 | 1.6 | +4 |
| ¹²C | 12 | 15 | +3 |
| ¹⁶O | 16 | +4 | |
| ¹⁶O | 20 | +5 | |
| ²⁸Si | 12 | 27 | +3 |
YeMiGO (Yemilab) : Yemi Micro-Gravity Observatory
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4th Photo :
National Absolute Gravity Standard Station by NGII (From April 3, 2026)
Earthquake Early Detection using Micro-Gravity Data
- To use gravity signal realizes the paradigm shift in the EQ warning system.
- Because the gravity signal propagates with a speed of light, it arrives faster than the arrival of the P-waves.
- Even the PEGS propagates faster than the P-wave, so it can secure enough time to respond before the arrival of the S-wave.
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1st Photo :
Coseismic gravity change after the earthquake (Dehghan et at, 2025, Pure and Appl. Geophys.)
Newtonian noise mitigation for Ground-based Gravitational-wave Detectors
- Newtonian & seismic noise wall below 30Hz
- Extend the low-frequency detetction bands
- Detect longer duration compact binary inspiral objects: enhancing SNR
- Improve the data quality due to mitigation of seismic vibrations caused by Earth
- Microgravity & seismic waves studies in the underground environment using superconducting gravimeter & seismometers (infrasound microphone etc)
- Collaboration: LIGO, KAGRA, Einstein Telescope
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1st Photo :
Sensitivity curve of Virgo and the seismic & Newtonian noise wall (shaded region)
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2nd Photo :
Einstein Telescope : European Space Agency
ENIGMA – East-Asian Microgravity Measurement Collaboration
- Collect SG gravity data for: Earthquake, Geodesy, Dark Matter Clumps etc
- Korea: NIMS, NGII, KISTI
- Canada: Univ. of Calgary
- Japan: Univ. of Tokyo, Kyoto Univ.
- China: CAS, Innovative Academy for Precision Measurement Science & Technology
- Taiwan: National Yang-Ming Chiao-Tung Univ.
Gravity changes due to possible dark matter clumps passing
by Earth or rotating inside the Earth inner core
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- DMC (Dark matter clumps) in the Solar System
- C. J. Horowitz and R. Widmer-Schnidrig, PRL 124, 051102 (2020)
- M. Cuadrat-Grzybowski et al., PRD110, 063029 (2024)
- If DM exists, there might be two possibilities: DMC captured by the Earth’s gravity or passed by the Earth with a certain orbital motions
- DMC (Dark matter clumps) in the Solar System