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Alpha particles lurk at the surface of neutron-rich nuclei


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Scientists from an international collaboration have found evidence of alpha particles at the surface of neutron-rich heavy nuclei, providing new insights into the structure of neutron stars, as well as the process of alpha decay.
Neutron stars are amongst the most mysterious objects in our universe. They contain extremely dense matter that is radically different from the ordinary matter surrounding us being composed almost entirely of neutrons rather than atoms. However, in the nucleus at the center of normal atoms, matter exists at similar densities.
Understanding the nature of matter at such extremes is important for our understanding of neutron stars, as well as the beginning, workings, and final fate of the universe, says Junki Tanaka, one of the leaders of the study. ....

Junki Tanaka , George Gamow , Zaihong Yang , Nishina Center , Nuclear Physics , Osaka University , Research Center , Accelerator Based Science , Chemistry Physics Materials Sciences , Atomic Molecular Particle Physics , Space Planetary Science , Stars The Sun , அணு இயற்பியல் , ஒசகக பல்கலைக்கழகம் , ஆராய்ச்சி மையம் , முடுக்குப்பொறி அடிப்படையிலானது அறிவியல் , வேதியியல் இயற்பியல் பொருட்கள் அறிவியல் , அணு மூலக்கூறு துகள் இயற்பியல் , இடம் கிரகங்கள் அறிவியல் , நட்சத்திரங்கள் தி சூரியன் ,

Testing the waters: Analyzing different solid states of water on other planets and moons


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IMAGE: Dissociation pressures of various clathrate hydrates across a range of cryogenic temperatures. The upper regions of each curve indicate stable boundaries of the clathrate hydrates. (Similar colors have been used.
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Credit: 2021 Hideki Tanaka, Okayama Univ.
Just like on Earth, water on other planets, satellites, and even comets comes in a variety of forms depending on multiple factors such as pressure and temperature. Aside from the gaseous, liquid, and solid states we are accustomed to, water can form a different type of crystalline solid called clathrate hydrate. Although they look similar to ice, clathrate hydrates have actually small water-based cages in which smaller molecules are trapped. These trapped guest molecules are essential for preserving the crystalline structure of clathrate hydrates, which would otherwise collapse into regular ice or water. ....

Hideki Tanaka , Okayama University , Planetary Science Journal , Professor Hideki Tanaka , Atomic Molecular Particle Physics , Space Planetary Science , Molecular Physics , ஹைடீகீ தனகா , ஒக்யமா பல்கலைக்கழகம் , கிரகங்கள் அறிவியல் இதழ் , ப்ரொஃபெஸர் ஹைடீகீ தனகா , அணு மூலக்கூறு துகள் இயற்பியல் , இடம் கிரகங்கள் அறிவியல் , மூலக்கூறு இயற்பியல் ,

NASA explores solar wind with new view of small sun structures