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Breakthrough in Superheavy Nuclei Stability and the Periodic Table

3 min read

Breakthrough in Superheavy Nuclei Stability and the Periodic Table

Clip title: This Calculation Could Change The Periodic Table Author / channel: Sabine Hossenfelder URL: https://www.youtube.com/watch?v=rTJJHIXRMnU

Summary

The video discusses the ongoing expansion of the periodic table through the creation of increasingly heavy atomic nuclei and a recent breakthrough in understanding their stability. Physicists are constantly producing heavier elements, which are typically very short-lived. However, a long-standing prediction, known as the “Island of Stability,” suggests that nuclei, once heavy enough, might become significantly more stable. The current heaviest confirmed element, Oganesson (atomic number 118), has a lifetime of about a microsecond, which is remarkably long compared to many other exotic particles.

The production of these superheavy nuclei is a specialized field, primarily undertaken by three laboratories globally (in Japan, Germany, and Russia), by slamming large nuclei together to form new, heavier ones. There is tentative experimental evidence for elements 119 and 120. The “Island of Stability” is theoretically anticipated around atomic number 120, with approximately 160-170 neutrons, where these nuclei could have lifetimes ranging from seconds to minutes. Understanding the underlying reasons for this predicted stability has been a significant challenge in nuclear physics.

A recent paper has finally offered a robust theoretical explanation for “magic numbers” in nuclear structure, which are specific quantities of protons or neutrons that lead to enhanced stability. Similar to electron shells in atoms, atomic nuclei have energy levels. When these “nuclear shells” are completely filled at certain “magic numbers” (like 2, 8, 20, 28, 50), it creates energy gaps in the nuclear spectrum, making the nucleus more tightly bound and therefore more stable. Previous models were largely phenomenological, relying on fitting experimental data (interpolation) but struggling with predictions beyond observed ranges (extrapolation). The new research uses a “top-down” approach, deriving nuclear structure from the fundamental symmetries of the strong nuclear force, specifically focusing on three-nucleon interactions and their combined spin contribution to the energy spectrum. This approach remarkably aligns with experimental observations.

While the new paper does not explicitly predict the exact location of the next “Island of Stability,” it provides the necessary theoretical framework to do so. This breakthrough could pave the way for “nuclear design,” enabling the creation of novel, stable superheavy materials that do not exist naturally. The presenter concludes with an optimistic view, asserting that if the theory of nuclear structure is truly understood, then the possibility of designing stable superheavy elements cannot be dismissed as impossible, hinting at a future where chemistry teachers might need much larger periodic tables.

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