摘要
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 55Ni（p,γ）56Cu 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.
^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 ^55Niep;cT56Cu 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.
基金
supported by the National Natural Science Foundation of China(Nos.11825504,11490562,and 11675229)
the Major State Basic Research Development Program of China(No.2016YFA0400503)
