Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (9): 141 doi: 10.1007/s41365-019-0663-6


Stellar reaction rate of 55Ni(p,g)56Cu in type I X-ray bursts

Shao-Bo Ma1,2 • Li-Yong Zhang 3 • Jun Hu 1,2   

  1. 1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
    3 College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
  • Received:2019-05-15 Revised:2019-06-03 Accepted:2019-06-10
  • Contact: Li-Yong Zhang
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Nos. 11825504, 11490562, and 11675229), and the Major State Basic Research Development Program of China (No. 2016YFA0400503).
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Shao-Bo Ma, Li-Yong Zhang, Jun Hu. Stellar reaction rate of 55Ni(p,g)56Cu in type I X-ray bursts.Nuclear Science and Techniques, 2019, 30(9): 141     doi: 10.1007/s41365-019-0663-6

Abstract: 56Cu is close to the waiting-point nucleus 56Ni and lies on the rapid proton capture (rp) process path in Type I X-ray bursts (XRBs). In this work, we obtained a revised thermonuclear reaction rate of 55Niðp; cÞ56Cu in the temperature region relevant to XRBs. This rate was recalculated based on the recent experimental level structure in 56Cu, the recently measured proton separation energy of Sp = 579.8(7.1) keV, together with shell-model calculation, and the mirror nuclear structure in 56Co. The associated uncertainties in the rates were estimated by a Monte Carlo method. Our revised rate is significantly different from the recent results, which were partially based on experimental results; in addition, we found that a result in a previous work was incorrect. We recommend our revised rate to be incorporated in the future astrophysical network calculations.

Key words: Nuclear astrophysics, Reaction rate, X-ray burst