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In Type-I X-ray bursts (XRBs), the rapid-proton capture (rp-) process passes through the NiCu and ZnGa cycles before reaching the region above Ge and Se isotopes that hydrogen burning actively powers the XRBs. The sensitivity study performed by Cyburt  et al . [1] shows that the  57 Cu(p, γ ) 58 Zn reaction in the NiCu cycles is the fifth most important rp-reaction influencing the burst light curves. Langer  et al . [2] precisely measured some low-lying energy levels of  58 Zn to deduce the  57 Cu(p, γ ) 58 Zn reaction rate. Nevertheless, the order of the 1 +  1  and 2 +  3  resonance states that dominate at 0:2 ≲  T (GK) ≲ 0:8 is not confirmed. The 1 +  2  resonance state, which dominates at the XRB sensitive temperature regime 0:8 ≲  T (GK) ≲ 2 was not detected. Using isobaric-multipletmass equation (IMME), we estimate the order of the 1 +  1  and 2 +  3  resonance states and estimate the lower limit of the 1 +  2  resonance energy. We then determine the  57 Cu(p, γ ) 58 Zn reaction rate using the full  pf  -model space shell model calculations. The new rate is up to a factor of four lower than the Forstner  et al . [3] rate recommended by JINA REACLIBv2.2. Using the present  57 Cu(p, γ ) 58 Zn, the latest  56 Ni(p, γ ) 57 Cu and  55 Ni(p, γ ) 56 Cu reaction rates, and 1D implicit hydrodynamic K epler  code, we model the thermonuclear XRBs of the clocked burster GS 1826–24. We find that the new rates regulate the reaction flow in the NiCu cycles and strongly influence the burst-ash composition. The  59 Cu(p, γ ) 56 Ni and  59 Cu(p, α ) 60 Zn reactions suppress the influence of the  57 Cu(p, γ ) 58 Zn reaction. They strongly diminish the impact of the nuclear reaction flow that bypasses the  56 Ni waiting point induced by the  55 Ni(p, γ ) 56 Cu reaction on burst light curve.

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Regulated NiCu Cycles with the New 57Cu(p,γ)58Zn Reaction Rate and the Influence on Type-I X-Ray Bursts: GS 1826–24 Clocked Burster