AstronomyScientists derive new reaction rate for rapid proton capture...

Scientists derive new reaction rate for rapid proton capture process

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Comparability of the experimental and theoretical excitation energies for the mirror nuclei 27S and 27Na, the place SM is the outcome from the shell mannequin, and Exp is the outcome from the experiment. Credit score: The Astrophysical Journal (2023). DOI: 10.3847/1538-4357/accf9c

Sort I X-ray bursts are essentially the most frequent kinds of thermonuclear stellar explosions within the galaxy. As the important thing nucleosynthesis course of in X-ray bursts, the speedy proton seize course of (rp-process) is all the time the vital scientific frontier in nuclear astrophysics. The 26P(p,γ)27S response is likely one of the key nuclear reactions in rp-process, and its accuracy is essential for comprehensively understanding the response path of the rp-process in X-ray bursts.

Lately, a world nuclear astrophysical group led by Hou Suqing from the Institute of Trendy Physics of the Chinese language Academy of Sciences efficiently derived the 26P(p,γ)27S response price based mostly on the newest nuclear mass of sulfur-27. The research is printed in The Astrophysical Journal.

Different establishments concerned on this research embody the Hungarian Academy of Sciences (Hungary), the College of Hull (UK), Michigan State College (US), and Texas A&M College-Commerce (US).

Scientists discovered that the 26P(p,γ)27S response price is dominated by a direct seize response mechanism fairly than resonant seize. They found that the brand new price is total smaller than the opposite earlier charges from the statistical model by not less than one order of magnitude within the temperature vary of X-ray burst curiosity.

The rp-process calculations confirmed that the ratio of isotope abundances of sulfur-27/phosphorus-26 when adopting the brand new charges is smaller by an element of 10 than that utilizing the charges from the Joint Institute for Nuclear Astrophysics response price database (Reaclib). As well as, the amassed materials on the phosphorus-26 nucleus is bigger than that on sulfur-27 throughout the entire rp-process episode.

Extra info:
S. Q. Hou et al, New 26P(p,γ)27S Thermonuclear Response Fee and Its Astrophysical Implications within the rp-process, The Astrophysical Journal (2023). DOI: 10.3847/1538-4357/accf9c

Quotation:
Scientists derive new response price for speedy proton seize course of (2023, July 24)
retrieved 25 July 2023
from https://phys.org/information/2023-07-scientists-derive-reaction-rapid-proton.html

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