{
  "id": 1524402,
  "title": "Stellar explosions come into focus with new nuclear reaction measurements",
  "url": "https://urgent.news/2026/08/17/stellar-explosions-come-into-focus-with-new-nuclear-reaction",
  "topic": "science",
  "section": "Science",
  "published": "2026-08-17T17:00:03.000Z",
  "source": {
    "name": "Phys.org",
    "slug": "phys-org",
    "url": "https://phys.org/news/2026-08-stellar-explosions-focus-nuclear-reaction.html"
  },
  "original_language": "en",
  "account": "In two separate papers published in Physical Review Letters, researchers explored the nuclear reactions occurring within two of the most energetic events in the cosmos: supernovae and X-ray bursts. These discoveries will aid scientists in creating more precise models of stellar explosions and understanding how new elements are formed. The initial study concentrated on supernovae, explosive events resulting from the demise of massive stars. Despite centuries of observations, the precise mechanisms of these explosions remain unclear. A key indicator is radioactive titanium-44, generated during a supernova and observable by space telescopes years post-explosion. At Argonne National Laboratory in the United States, researchers from Surrey obtained the first experimental data to determine the rate of a nuclear reaction responsible for titanium-44 production. Their findings revealed this reaction occurs much more slowly than previously estimated, potentially increasing titanium-44 production by up to 35%. This enhancement enables astronomers to align computer simulations more closely with real observations, bringing them closer to comprehending the intricacies of supernovae. Dr. Christopher Cousins, a postdoctoral researcher at the University of Surrey's Nuclear Physics Group, expressed excitement over the progress, stating that such measurements were once considered unattainable but now provide new insights into one of the most significant unresolved questions in astrophysics. The second study examined X-ray bursts, the most common stellar explosions in the universe. These explosions occur when a dense neutron star accretes material from a nearby companion star, leading to repeated thermonuclear reactions that generate heavier elements and release tremendous energy. Working at the new Facility for Rare Isotope Beams (FRIB) in Michigan, the team precisely measured a nuclear reaction driving X-ray bursts, reducing uncertainty about the reaction's behavior by over tenfold. The results resolved a longstanding debate regarding the nickel-copper cycle's role in X-ray bursts, demonstrating its influence on light curves but primarily affecting a small fraction of the material. Dr. Connor O Shea, a postdoctoral research fellow in nuclear astrophysics, commented that while the nickel-copper cycle does impact X-ray bursts, it likely only captures a tiny portion of the material, thus providing a more realistic depiction of these explosions. Despite decades of research, scientists still lack a complete understanding of the nuclear reactions powering some of the universe's most spectacular stellar explosions. These studies elucidate crucial aspects of X-ray bursts and supernovae, offering experimental evidence where previous efforts relied on theory and assumptions. Together, they offer a clearer picture of how these explosions unfold, allowing researchers to compare models more accurately with astronomical observations and advancing our knowledge of how chemical elements are produced and dispersed across the cosmos.",
  "summary": "In two separate papers published in Physical Review Letters, researchers investigated the nuclear reactions that take place inside supernovae and X-ray bursts—two of the universe's most powerful explosions. Together, the findings will help scientists build more accurate models of how stars explode and how newly formed elements are produced.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}