![\"New](\"https:\/\/www.europesays.com\/uk\/wp-content\/uploads\/2025\/06\/new-superheavy-isotope.jpg\" "\\"Electronic")
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Electronic configuration of seaborgium (Sg). Credit: Ahazard.sciencewriter\/Wikimedia Commons. commons.wikimedia.org\/wiki\/File:106_seaborgium_(Sg)_enhanced_Bohr_model.png.<\/p>\n
In a study published<\/a> in Physical Review Letters, scientists at GSI Helmholtzzentrum f\u00fcr Schwerionenforschung have discovered a new superheavy isotope, 257Sg (seaborgium), whose properties are providing new insights into nuclear stability and fission in the heaviest elements.<\/p>\n Superheavy elements exist in a delicate balance between the attractive nuclear force that holds protons and neutrons together and the repulsive electromagnetic force that pushes positively charged protons apart.<\/p>\n Without quantum shell effects, analogous to electron shells in atoms, these massive nuclei would split apart in less than a trillionth of a second.<\/p>\n Phys.org spoke to co-authors Dr. Pavol Mosat and Dr. J. Khuyagbaatar from GSI Helmholtzzentrum f\u00fcr Schwerionenforschung, Germany, about their work.<\/p>\n The study reveals our incomplete understanding of how the most extreme atomic nuclei behave, with the findings suggesting that the quantum effects<\/a> that keep superheavy nuclei from instantly disintegrating might operate differently than previously believed.<\/p>\n Investigating nuclear stability<\/p>\n The international research team used GSI’s gas-filled recoil separator TASCA to create 257Sg through fusion reactions between chromium-52 and lead-206 nuclei.<\/p>\n They found that the new isotope lives for 12.6 milliseconds, longer than its even-even neighbor 258Sg, and decays through both spontaneous fission<\/a> and alpha-particle emission.<\/p>\n The alpha decay pathway proved particularly revealing. When 257Sg emits an alpha particle, it transforms into 253Rf (rutherfordium), which then undergoes fission after just 11 microseconds.<\/p>\n This observation supports recent findings that have questioned the traditional understanding of how angular momentum affects fission. While higher K quantum numbers were expected to provide stronger fission hindrance, emerging data suggests this relationship may be more complex than previously believed.<\/p>\n “We studied 257Sg and 253Rf isotopes and found that, in general, K-quantum numbers do indeed hinder fission,” said Mosat. “However, the absolute value of hindrances is still unknown.”<\/p>\n \t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tFirst K-isomer in seaborgium<\/p>\n Perhaps even more significant was the team’s discovery of the first K-isomeric state in a seaborgium isotope. K-isomers are special nuclear configurations with high angular momentum that resist fission far more effectively than ordinary nuclear states.<\/p>\n In 259Sg, the researchers detected a conversion electron signal appearing 40 microseconds after nuclear formation, strong evidence for a K-isomeric state that could be stable against the fission hundreds of times longer than the ground state.<\/p>\n “K isomeric states have already been observed in superheavy nuclei such as 252\u2013257Rf, and 270Ds,” noted Khuyagbaatar. “We observed K-isomer exclusively in nuclei with 106 protons, i.e., in Sg isotopes for the first time.”<\/p>\n This finding fills a crucial gap in scientists’ understanding of superheavy elements<\/a> and could have profound implications for future element discovery efforts.<\/p>\n Implications for the ‘island of stability’<\/p>\n The discovery comes at a critical time in superheavy element research.<\/p>\n Scientists have long searched for the theoretical “island of stability,” a region where certain superheavy nuclei might exist for extended periods due to favorable shell effects. However, the new findings suggest this landscape may be more complex than anticipated.<\/p>\n “It may happen that the superheavy nucleus, for instance, an isotope of a not-yet-discovered element, may live less than 1 \u03bcs [microsecond],” explained Khuyagbaatar.<\/p>\n “If so, then the discovery of element 120 will likely face separation and detection challenges. However, if a K-isomeric state exists in this nucleus, it could live longer, as we recently demonstrated with 252Rf.”<\/p>\n The researchers estimate that the still-undiscovered 256Sg could have a dramatically shorter half-life than theoretical predictions suggest, potentially dropping from the predicted 6 microseconds to just one nanosecond.<\/p>\n Such a significant deviation in stability would represent an important new insight in nuclear physics.<\/p>\n \n Discover the latest in science, tech, and space with over 100,000 subscribers<\/strong> who rely on Phys.org for daily insights. \t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tTechnical challenges and future work<\/p>\n The experimental achievement required overcoming significant technical challenges. Working with nuclei that exist for mere milliseconds demanded extraordinarily fast detection systems and precise timing.<\/p>\n “In the case of short-lived nuclei, it is very important to have a relatively short-length separator and, more crucially, to have fast digital electronics that can disentangle radioactive decay signals down to about 100 ns,” explained Khuyagbaatar.<\/p>\n The team developed specialized digital electronics at GSI that have proven crucial for multiple superheavy element discoveries.<\/p>\n The team’s next goal is synthesizing 256Sg to test whether the predicted dramatic decrease in stability actually occurs.<\/p>\n “Indeed, we will try to explore further cases of long-lived K-isomeric states in superheavy nuclei,” said Mosat. “Concerning the current topic, our nearest plan will be to try to synthesize the next unknown 256Sg.”<\/p>\n \n Written for you by our author Tejasri Gururaj<\/a>,
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