New proton capture rate of copper-57 alters nucleosynthesis pathways in type I X-ray burst

Новата скорост на реакция на улавяне на протони на мед-57 променя пътищата на нуклеосинтеза при рентгенов изблик тип I ---- Китайска академия на науките

The modeled and observed periodic light curve of the X-ray explosion at the X-ray source GS 1826–24. The light curve generated by the new proton capture response rate on copper-57 and other updated response rates (red line). credit: The Astrophysical Journal/

An international research team recently developed a new proton capture rate of copper-57 for extreme astrophysical environments on the surface of neutron stars. The researchers found that the new reaction rate altered some of the most critical pathways of nucleosynthesis in type I X-ray bursts.

Posted in The Astrophysical JournalThe study was conducted by researchers from the Institute of Modern Physics of the Chinese Academy of Sciences, Monash University, the Bordeaux-Gradinian Center for Nuclear Research, the Joint Institute for Nuclear Astrophysics and RIKEN.

Ever since the first Type I X-ray burst was discovered in the last century, astrophysicists have been trying to understand the physics that drive these bursts. This includes understanding them energy productionthe composition of the exploded ash left on the surface of the neutron star, and perhaps even their contribution to the formation of some of the rarest chemical elements in the universe.

To build accurate models of these bursts, in addition to macroscopic astrophysical conditions, scientists need to know exactly the rate of nuclear response of key nuclides. Detailed knowledge of the path of the nuclear reaction allows them to model the synthesis of chemical elements.

Previous studies have shown that the proton capture reaction of copper-57 is the fifth most influential reaction affecting the periodic thermonuclear burst of the GS 1826-24 X-ray source.

In this study, the research team obtained the new proton capture rate of copper-57, which is only 20% of the previous rate. Using a state-of-the-art model to simulate X-ray type I bursts (KEPLER code), they successfully reproduced a set of theoretical X-ray light curves that largely coincide with the observed light curves of the GS 1826-24 X-ray source.

They found that the new proton capture rate of copper-57 significantly changed the composition of the exploded ash. The composition of the exploded ash is an essential ingredient for studies of the super-explosions that burn this ash and the cooling of the neutron star.

These results help to better limit the equation of state of nuclear matter under extreme conditions inside neutron starswhich is a key ingredient for understanding gravitational waves from fusions of binary neutron stars and gamma rays exploded analogues in the era of astronomy with many envoys.


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More info:
Yi Hua Lam et al, Regulated NiCu cycles with the new 57Cu (p, γ) 58Zn reaction rate and its effect on type I X-ray bursts: GS 1826–24 Clocked Burster, The Astrophysical Journal (2022). DOI: 10.3847 / 1538-4357 / ac4d89

Quote: New proton capture rate of copper-57 alters nucleosynthesis pathways in type I X-ray explosion (2022, June 17), retrieved June 17, 2022 from https://phys.org/news/ 2022-06-proton-capture-reaction-copper-nucleosynthesis.html

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