Background and Research Interests

Geon-Bo Kim's backgrounds are cryogenic particle detection, dark matter and neutrino physics, and low background experiment for rare event detection. He is leading Magnetic Microcalorimeter-based experiments at LLNL. His current research interests include

• High precision nuclear material analysis using cryogenic microcalorimeters
• Developing cryogenic particle detectors for sub-GeV DM and CEvNS detection
• Developing HPGe detectors for space missions and planetary gamma-ray spectroscopy

Ph.D. in Physics, Seoul National University, 2016

B.Ed. in Physics Education, Korea National University of Education, 2009

Cryogenic particle detectors, dark matter and neutrino physics

1. Friedrich, S., et al. "Limits on the Existence of sub-MeV Sterile Neutrinos from the Decay of Be 7 in Superconducting Quantum Sensors." Physical Review Letters 126.2 (2021): 021803. https://doi.org/10.1103/PhysRevLett.126.021803
2. Fretwell, S., et al. "Direct Measurement of the Be 7 L/K Capture Ratio in Ta-Based Superconducting Tunnel Junctions." Physical Review Letters 125.3 (2020): 032701. https://doi.org/10.1103/PhysRevLett.125.032701
3. Kim, Geon-Bo, Self-absorption and Phonon Pulse Shape Discrimination in Scintillating Bolometers, J Low Temp Phys (2020). https://doi.org/10.1007/s10909-020-02365-x
4. Kim, G. B., et al., Novel measurement method of heat and light detection for neutrinoless double beta decay. Astroparticle Physics 91 (2017): 105-112. https://doi.org/10.1016/j.astropartphys.2017.02.009

Gamma-ray spectroscopy

1. Kim, G. B., et al., A New Measurement of the 60 keV Emission from Am-241 Using Metallic Magnetic Calorimeters, J Low Temp Phys (2020). https://doi.org/10.1007/s10909-020-02412-7
2. Kim, G. B., et al., Consistent measurements of 233U gamma emissions using metallic magnetic calorimeters with ultra-high energy resolution. J Radioanal Nucl Chem 318, 803-808 (2018). https://doi.org/10.1007/s10967-018-6182-9
3. Kim, G. B., et al., Development of MMC Gamma Detectors for Precise Characterization of Uranium Isotopes.  J Low Temp Phys 193 (2018): 1236-1242. https://doi.org/10.1007/s10909-018-1978-0

Alpha and decay energy spectroscopy

1. Yoon, W. S., et al., Development of a high resolution alpha spectrometer using a magnetic calorimeter. Nucl Instrum Meth A 784 (2015): 143-146. https://doi.org/10.1016/j.nima.2014.09.037
2. Jang, Y. S. et al., Development of decay energy spectroscopy using low temperature detectors, Appl Radiat Isot 70 (2012): 2255-2259. https://doi.org/10.1016/j.apradiso.2012.02.109

Full publication list is available at https://scholar.google.com/citations?user=oY8B33wAAAAJ&hl=en&oi=ao.

• Directorate Gold Award, "Next Generation HPGe Detection Systems", LLNL, 2019
• Best Poster Awards, "Germanium Gamma-ray Spectrometers for NASA Space Missions: Mechanically-Cooled, Low-Mass, Low-Power Systems", Postdoc Poster Symposium, LLNL, 2019.
• Outstanding Mentor Award, LLNL, 2018.
• Best dissertation award, “A 0νββ search using large scintillating crystal with metallic magnetic calorimeter,” Seoul National University, South Korea, 2016
• Outstanding researcher award, Institute for Basic Science, South Korea, 2014