兰州大学机构库 >核科学与技术学院
Mass measurements show slowdown of rapid proton capture process at waiting-point nucleus 64Ge
2023
Source PublicationNature Physics   Impact Factor & Quartile
ISSN1745-2473
AbstractX-ray bursts are among the brightest stellar objects frequently observed in the sky by space-based telescopes. A type-I X-ray burst is understood as a violent thermonuclear explosion on the surface of a neutron star, accreting matter from a companion star in a binary system. The bursts are powered by a nuclear reaction sequence known as the rapid proton capture process (rp process), which involves hundreds of exotic neutron-deficient nuclides. At so-called waiting-point nuclides, the process stalls until a slower β+ decay enables a bypass. One of the handful of rp process waiting-point nuclides is 64Ge, which plays a decisive role in matter flow and therefore the produced X-ray flux. Here we report precision measurements of the masses of 63Ge, 64,65As and 66,67Se—the relevant nuclear masses around the waiting-point 64Ge—and use them as inputs for X-ray burst model calculations. We obtain the X-ray burst light curve to constrain the neutron-star compactness, and suggest that the distance to the X-ray burster GS 1826–24 needs to be increased by about 6.5% to match astronomical observations. The nucleosynthesis results affect the thermal structure of accreting neutron stars, which will subsequently modify the calculations of associated observables. © 2023, The Author(s).
KeywordNeutrons Nucleosynthesis Stars Structure (composition) Binary systems Capture process Mass measurements Neutron stars Point nuclei Reaction sequences Space-based telescopes Stellars Thermonuclear explosions X-rays: bursts
PublisherNature Research
DOI10.1038/s41567-023-02034-2
Indexed ByEI
Language英语
EI Accession Number20231814046335
EI KeywordsIsotopes
EI Classification Number657.2 Extraterrestrial Physics and Stellar Phenomena ; 932.2 Nuclear Physics ; 951 Materials Science
Original Document TypeArticle in Press
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/500483
Collection核科学与技术学院
Corresponding AuthorWang, M.; Zhang, Y.H.; Litvinov, Yu. A.
Affiliation
1.CAS Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China;
2.School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, China;
3.GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany;
4.Institute of Nuclear and Particle Physics, Department of Physics and Astronomy, Ohio University, Athens; OH, United States;
5.Max-Planck-Institut für Kernphysik, Heidelberg, Germany;
6.Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing, China;
7.Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, China;
8.School of Nuclear Science and Technology, Lanzhou University, Lanzhou, China;
9.State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing, China;
10.School of Nuclear Science and Engineering, East China University of Technology, Nanchang, China
Recommended Citation
GB/T 7714
Zhou, X.,Wang, M.,Zhang, Y.H.,et al. Mass measurements show slowdown of rapid proton capture process at waiting-point nucleus 64Ge[J]. Nature Physics,2023.
APA Zhou, X..,Wang, M..,Zhang, Y.H..,Litvinov, Yu. A..,Meisel, Z..,...&Zhang, S..(2023).Mass measurements show slowdown of rapid proton capture process at waiting-point nucleus 64Ge.Nature Physics.
MLA Zhou, X.,et al."Mass measurements show slowdown of rapid proton capture process at waiting-point nucleus 64Ge".Nature Physics (2023).
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