March 29, 2025 — Yangyang, South Korea — The Advanced Mo-based Rare Process Experiment (AMoRE) has reached a significant milestone in the global search for neutrinoless double beta decay, a rare nuclear process that could revolutionize our understanding of fundamental particle physics. While no direct evidence of the decay was detected, the latest findings have set a new upper limit on the halflife of molybdenum-100, a key isotope used in the experiment, marking a leap forward in sensitivity.
The results, published in Physical Review Letters, represent the most stringent constraints to date for this decay in molybdenum-100, refining the theoretical and experimental landscape for future investigations.
A Glimpse into Neutrino Mysteries
At the heart of the AMoRE experiment is the quest to determine whether the neutrino is its own antiparticle — a Majorana particle. If proven, this would not only challenge the current Standard Model of particle physics but also provide crucial insights into why the universe contains more matter than antimatter.
The phenomenon, known as neutrinoless double beta decay, would involve the transformation of two neutrons into two protons in a nucleus without the emission of neutrinos — violating lepton number conservation and confirming the Majorana nature of neutrinos.
Cutting-Edge Techniques at the Yangyang Underground Laboratory
Conducted at the Yangyang Underground Laboratory in Korea, the AMoRE-I phase utilized scintillating molybdate crystals containing molybdenum-100, cooled to cryogenic temperatures. This innovative setup allowed for the ultra-sensitive detection of rare nuclear events, while minimizing interference from cosmic radiation and other background noise.
Yoomin Oh, corresponding author of the study, emphasized the significance of the experiment in a recent interview:
“The neutrino is among the most abundant but least understood particles in the universe. Determining whether it is its own antiparticle could reshape our understanding of the fundamental laws of physics.”
Next Steps: AMoRE-II at Yemilab
Though AMoRE-I did not observe neutrinoless double beta decay, the experiment achieved the highest sensitivity ever recorded for molybdenum-100, setting the stage for the next ambitious phase — AMoRE-II, currently under construction at Yemilab, Korea’s new underground research facility.
Key upgrades in AMoRE-II will include:
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Larger detector mass using enhanced molybdate crystals
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Ultra-low background environment
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Improved cryogenic technology for better energy resolution
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Increased data collection capability
Data collection is expected to begin within the next 12 months, with scientists hopeful that the improved conditions will either detect the elusive decay or further tighten constraints, narrowing the theoretical parameter space even more.
Global Impact and Scientific Significance
The AMoRE results add to a growing international effort that includes projects like GERDA, EXO, CUORE, and KamLAND-Zen, each working with different isotopes and detection methods. Together, these experiments are leading the charge to uncover the true nature of the neutrino, a question that sits at the intersection of particle physics, cosmology, and quantum theory.
Conclusion
While the quest to observe neutrinoless double beta decay continues, the AMoRE collaboration has raised the bar in precision and experimental rigor. With AMoRE-II on the horizon, scientists are edging closer to unlocking one of the most profound mysteries in modern physics — one that could reshape our understanding of matter, antimatter, and the origins of the universe.
Bhupendra Singh Chundawat is a seasoned technology journalist with over 22 years of experience in the media industry. He specializes in covering the global technology landscape, with a deep focus on manufacturing trends and the geopolitical impact on tech companies. Currently serving as the Editor at Udaipur Kiran, his insights are shaped by decades of hands-on reporting and editorial leadership in the fast-evolving world of technology.
