Scientists just recreated a rare cosmic reaction never seen before

A breakthrough experiment has shed new light on one of astrophysics’ biggest mysteries: the origin of rare proton-rich elements. For the first time, scientists directly measured a key reaction that creates selenium-74 using a rare isotope beam. The results sharpen models of how these elements form i

In a milestone for nuclear astrophysics, researchers at the Facility for Rare Isotope Beams (FRIB) have successfully measured a rare cosmic reaction involving the isotope arsenic-73. The study, led by Artemis Tsantiri and involving over 45 scientists worldwide, directly measured how arsenic-73 captures a proton to form selenium-74. This discovery provides critical insights into the formation of 'p-nuclei,' a group of proton-rich isotopes that cannot be produced through standard neutron-capture processes.

The research helps clarify the 'gamma process' that occurs during supernova explosions, where intense heat creates gamma rays that strip particles from heavy nuclei. By mastering the synthesis of these short-lived isotopes in a lab, scientists are finally beginning to solve the mystery of why certain elements exist in the universe despite their complex origins. The findings, published in Physical Review Letters, represent a significant leap in our understanding of the elemental 'synthetic soup' created by cosmic events.