Scientists have discovered 188At, the heaviest proton-emitting nucleus, challenging nuclear binding theories.
Scientists at the Accelerator Laboratory of the University of Jyväskylä, Finland, have successfully measured the heaviest nucleus to date that undergoes proton emission.The discovery unveils a new isotope of astatine, named 188At, which exhibits a surprising “watermelon” shape and challenges existing theoretical models of nuclear binding.
“We report the discovery of a new atomic nucleus 188At, which is the heaviest proton-emitting isotope known to date,” said the researchers in a new study.“The new activity was observed through the 107Ag188At fusion-evaporation reaction using the focal-plane spectrometer of the gas-filled recoil separator in the Accelerator Laboratory of the University of Jyväskylä, Finland.”Cornerstone of nuclear researchProton emission is a rare form of radioactive decay where a nucleus sheds a proton to achieve stability. It has been a cornerstone of nuclear research. “The previously heaviest known proton emitter 185Bi was first detected in 1996,” highlighted the researchers.The newly identified 188At isotope, comprising 85 protons and 103 neutrons, is now the lightest known isotope of astatine and is the heaviest nucleus yet observed to decay via this mechanism.“Proton emission is a rare form of radioactive decay, in which the nucleus emits a proton to take a step towards stability,” explained Doctoral Researcher Henna Kokkonen from the University of Jyväskylä.Using unique experimental techniquesStudying such exotic nuclei presents immense challenges due to their fleeting lifetimes and low production rates. To overcome this, the researchers employed precise techniques. “The nucleus was produced in a fusion-evaporation reaction by irradiating natural silver target with 84Sr ion beam,” stated Academy Research Fellow Kalle Auranen from the University of Jyväskylä. “The new isotope was identified using the detector setup of the RITU recoil separator.”Beyond the experimental measurements, the research team expanded a theoretical model to interpret the observed data. This model revealed the strongly prolate, or “watermelon-shaped,” nature of the 188At nucleus.Intriguingly, the properties of this novel nucleus suggest an unprecedented trend change in the binding energy of the valence proton. “This is possibly explained by an interaction unprecedented in heavy nuclei,” Kokkonen noted, hinting at new physics at play within the atomic nucleus.Broader context of nuclear discoveriesThis discovery is a direct scientific follow-up to Kokkonen’s master’s thesis, where she previously unearthed another new type of atomic nucleus, the 190-astatine, with her thesis article published in Physical Review C in 2023. “Isotope discoveries are rare worldwide, and this is the second time I have had the opportunity to be part of making history,” concluded Kokkonen. “Every experiment is challenging, and it feels great to do research that improves understanding of the limits of matter and the structure of atomic nuclei.”Meanwhile, the science community is aggressively looking for new discoveries. Earlier, researchers from the Relativistic Heavy Ion Collider’s Star Collaboration unveiled the heaviest antimatter nucleus ever detected.This antinucleus, antihyperhydrogen-4, was composed of four antimatter particles: an antiproton, two antineutrons, and one antihyperon.
United States Latest News, United States Headlines
Similar News:You can also read news stories similar to this one that we have collected from other news sources.
Desmond Watson makes NFL history as league’s heaviest player at 464 poundsThe Tampa native and former Florida Gators defensive tackle signed with the Buccaneers after going undrafted and now holds the title as the heaviest player in NFL history.
Read more »
Watermelon sushi to watermelon tacos: Enjoy offbeat eats at this whimsical festThe California Watermelon Festival is known for its tempting array of cool-down snacks and nostalgic fun, too.
Read more »
Scientists use salinity to trace changes in the US Northeast Coastal OceanThe near-bottom water on the U.S. Northeast continental shelf provides a critical cold-water habitat for the rich regional marine ecosystem. This 'cold pool' preserves winter temperatures, even when waters elsewhere become too warm or salty during the summer. The U.S.
Read more »
Junk Food Is Filling Our Brains With Microplastics, Raising Mental Health Risks, Scientists WarnMicroplastics could play a hidden role in the relationship between ultra-processed foods and certain neurological disorders, according to new research.
Read more »
Earth may already be too hot for the survival of polar ice sheets, scientists sayIf Earth stays at its current levels of warming — below policymakers’ goal of 1.5 degrees Celsius — polar ice sheets may continue to quickly melt, causing seas to rise and displacing coastal communities, a study finds.
Read more »
10 Watermelon Nail Designs for a Vibrant Summer LookWatermelon nail ideas that are sweet, juicy, and refreshing—get inspired by 10 cute designs and shop watermelon-colored polishes now.
Read more »