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 a crucial scientific frontier in nuclear astrophysics. Titanium-42 is a typical branching nucleus within the rp-process, so the accuracy of 42Ti(p, γ)43V response fee is essential for comprehensively understanding the response path of rp-process in X-ray bursts.
Just lately, a world nuclear astrophysical group led by HOU Suqing from the Institute of Fashionable Physics (IMP), Chinese language Academy of Sciences (CAS), has derived the correct 42Ti(p, γ)43V response charges and confirmed a response path of the rp-process.
The outcomes have been printed in Astronomy & Astrophysics on Sept. 18.
Researchers from the College of North Carolina (U.S.), Duke College (U.S.), the Hungarian Academy of Sciences (Hungary), the College of Hull (U.Okay.) and the Joint Institute for Nuclear Astrophysics (U.S.) have been additionally concerned within the research.
The researchers obtained the brand new 42Ti(p, γ)43V response charges based mostly on the entire resonance info and the newest nuclear mass of vanadium-43. They discovered that the brand new charges have been totally different from earlier charges from the statistical mannequin by not less than two orders of magnitude for ahead fee and 4 orders of magnitude for reverse fee within the temperature vary of X-ray burst curiosity.
The rp-process nucleosynthesis calculations confirmed that the adoption of the brand new ahead and reverse charges may lead to abundance variations for scandium and calcium by 128% and 49%, respectively, in contrast with the variations utilizing the statistical model charges. Then again, the general abundance sample was not considerably affected.
Through the use of the brand new charges, the researchers confirmed that the response path of 42Ti(p, γ)43V(p, γ)44Cr(β+)44V was a key department of the rp-process in X-ray bursts.
Extra info:
S. Q. Hou et al, Improved thermonuclear fee of 42Ti(p,γ)43V and its astrophysical implication within the rp course of, Astronomy & Astrophysics (2023). DOI: 10.1051/0004-6361/202347054
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Chinese Academy of Sciences
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Nuclear astrophysical group confirms response path of speedy proton seize course of (2023, October 16)
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