Modeled and observed curve of periodic X-ray burst light from X-ray source GS 1826–24. Light curve due to the new reaction rate of proton capture on Cu-57 and other updated reaction rates (red line). attributed to him: Astrophysical Journal/
An international research team recently developed a new proton capture reaction rate from Cu-57 for the extreme astrophysical environment on the surface of neutron stars. The researchers found that the new reaction rate alters some of the most important nucleosynthesis pathways in type I X-ray bursts.
Posted in Astrophysical JournalThe study was conducted by researchers at the Institute of Modern Physics of the Chinese Academy of Sciences, Monash University, the Center for Nuclear Studies of Bordeaux-Gradienian, the Joint Institute for Nuclear Astrophysics, and Riken.
Since the discovery of the first Type I X-ray burst in the last century, astrophysicists have been keen to understand the physics driving these explosions. This includes understanding Power generationthe composition of explosive ash left on the surface of the neutron star, and perhaps even its contribution to the formation of some of the rare chemical elements in the universe.
To build accurate models of these bursts, as well as the macroscopic astrophysical conditions, scientists need to know precisely the nuclear reaction rates of the major nuclides. Detailed knowledge of the nuclear reaction pathway allows them to model the combinations of chemical elements.
Previous studies indicate that the copper-57 proton capture reaction is the fifth most influential reaction affecting the cyclic thermonuclear blast of X-ray source GS 1826-24.
In this study, the research team obtained the rate of the new proton capture reaction for copper-57, which is only 20% of the previous rate. Using a state-of-the-art type I X-ray burst simulation model (KEPLER code), they succeeded in reproducing a set of theoretical curves of X-ray burst light that closely matched the light curves observed at the GS 1826-24 X-beam source.
They found that the rate of the new proton capture reaction of copper 57 significantly changes the composition of the explosive ash. The composition of explosive ash is a key component in studies of the supernovae that burn this ash and cool neutron stars.
These results help to better constrain the nuclear state equation harsh conditions inside neutron starswhich is an essential component of comprehension gravitational waves from binary mergers of neutron stars and Gamma rays Their counterparts exploded in the era of multi-messenger astronomy.
Yi Hua Lam et al, Structured NiCu cycles with the new 58Zn reaction rate 57Cu(p,) and its effect on type I X-ray bursts: GS 1826–24 Clocked Burster, Astrophysical Journal (2022). DOI: 10.3847 / 1538-4357 / ac4d89
Chinese Academy of Sciences
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