Stellar explosions come into focus with new nuclear reaction measurements

• In two studies published in Physical Review Letters, researchers measured nuclear reactions that occur during supernovae and X-ray bursts. The first study focused on supernovae, revealing that the reaction controlling titanium-44 production happens much more slowly than previously thought, increasing predicted titanium-44 production by up to 35%. This will allow astronomers to compare computer models more closely with real observations. - The second study investigated X-ray bursts, measuring a nuclear reaction that powers these explosions with greater precision, reducing uncertainty about the nickel-copper cycle's role in shaping their light curves. - These findings provide experimental evidence where previous research relied on theory and estimates, offering clearer models of stellar explosions and helping scientists understand how elements are created and spread throughout the universe.

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