The nucleus of an atom contains nucleons, which are subatomic particles made up of protons and neutrons. While the atomic number of an element is determined by its protons, the number of neutrons can vary, resulting in different isotopes. Oxygen, for example, has 8 protons but can have varying numbers of neutrons. Previously, the largest number of neutrons observed in an oxygen isotope was 18 in oxygen-26.

Oxygen-28: Unveiling a New Isotope

A team led by nuclear physicist Yosuke Kondo from Tokyo Institute of Technology has discovered two new oxygen isotopes, oxygen-27 and oxygen-28, with 19 and 20 neutrons, respectively. The team conducted their research at the RIKEN Radioactive Isotope Beam Factory, a facility designed to produce unstable isotopes using a cyclotron accelerator.

Creating Oxygen-28: The team used a two-step process to create the oxygen-28 isotope. First, they fired a beam of calcium-48 isotopes at a beryllium target to generate lighter atoms, including fluorine-29, which has 9 protons and 20 neutrons. They then collided this fluorine-29 with a liquid hydrogen target to remove a proton and create oxygen-28. The result was surprising – both oxygen-27 and oxygen-28 turned out to be unstable, quickly decaying into oxygen-24 and 3 or 4 loose neutrons, respectively.

The instability of oxygen-28 is intriguing because both 8 and 20 are considered “magic” numbers for protons and neutrons, respectively. These magic numbers indicate that the nucleus is expected to be stable. The stability of a nucleus depends on the filling of proton and neutron shells, which are energy levels that determine the stability of an atom. A nucleus in which both proton and neutron shells are completely filled is known as a doubly magic nucleus. Below is the diagram of the experiment (Nature):

Island of Inversion Hypothesis

Most of the oxygen on Earth, including the oxygen we breathe, is oxygen-16, which is doubly magic. Oxygen-28 was believed to be the next doubly magic isotope after oxygen-16, but previous attempts to find it were unsuccessful. The new findings by Kondo and his colleagues suggest that the neutron shell was not completely filled in oxygen-28. This challenges the assumption that 20 is a magic number for neutrons.

Interestingly, this inconsistency is consistent with a phenomenon known as the “island of inversion” for isotopes of neon, sodium, and magnesium, where shells of 20 neutrons are not fully closed. This also extends to fluorine-29 and, now, apparently oxygen-28. Further research is needed to understand the unclosed neutron shell, and investigating the nucleus in an excited, higher-energy state could provide more insights. Additionally, alternative methods of forming oxygen-28 could also offer valuable information, although they are more challenging to achieve.

Overall, the findings from Kondo’s team shed light on the complexity of doubly magic nuclei. This discovery challenges our previous understanding and opens up new avenues for exploring the mysteries of atomic structure. The research has been published in the journal Nature.

Mohsin Rasheed

Co-Founder & Chief Editor of Everyman Science. I view science not just as a collection of facts, but as the ultimate guide for human survival. From medical breakthroughs to the logistics of space exploration, I am dedicated to documenting how scientific reasoning uplifts the human spirit and provides the blueprints to save our planet. I believe that by unleashing the power of nature through disciplined inquiry, we can secure a sustainable future for humanity.

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Japan’s AI Chip Competitor Rapidus

This news is part of Japan’s ambitious plan to become a leader in AI technology. Rapidus, a Japanese tech firm renowned for its advanced 2nm chip technology, is now emerging as a major competitor in the world of AI chips. With Taiwan’s political situation becoming increasingly uncertain, Japanese chip manufacturing could be seen as a safer option. Furthermore, Japan is also taking steps to help shape the global rules for AI systems within the G-7.

Anime/Graphic Art Creators’ Concerns

While Japan’s decision is not universally embraced, it has sparked concern among anime and graphic art creators who fear that AI could diminish the intrinsic worth of their creations. Conversely, a contrasting perspective emerges from the realms of academia and business, as they fervently advocate for the government to capitalize on Japan’s permissive data laws. Their compelling argument posits that such a proactive stance would elevate Japan’s global competitiveness to new heights.

Govt Urged to Take Advantage of Relaxed Data Laws

With Japan having one of the lowest per-capita incomes in the G-7 and its economic growth having been sluggish since the 1990s, there is hope that effective implementation of AI could potentially increase GDP by 50% or more in a short period of time. Additionally, access to Western data is also essential for Japan’s success with AI; while there is an abundance of Japanese language training data available compared to English language resources found in the West, anime content from Japan has become popular globally. Thus it appears that Japan is seeking to ensure that if Western countries use Japanese culture for AI training then literary resources from those countries should also be accessible for Japanese AI projects.

Japan Elevates Global AI Regulation Discourse

Japan’s stance adds an interesting dynamic to current debates surrounding regulation and governance of AI technologies on an international scale; rather than disregarding global frameworks like some less developed countries may do in order to gain an advantage over others, we see one of the world’s largest economies choosing not to hinder research and development into this new technology but instead using it as a means to compete directly with other nations around the world.

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