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The $^{18}$Ne($\alpha,p$)$^{21}$Na reaction plays a significant role inType-I X-ray bursts. It is a major path in the breakout from the hot-CNO cyclesto the synthesis of heavier elements in the $\alpha p$-- and $rp$-processes. Anexperiment to determine the cross section of this reaction was performed withthe ANASEN active-target detector system, determining the cross section atenergies between 2.5 and 4 MeV in the center-of-mass frame. The measured crosssections for reactions populating the ground state in $^{21}$Na are consistentwith results obtained from the time-inverse reaction, but significantly lowerthan the previously published experimental data of direct measurements. Thetotal cross sections are also compared with those derived from indirect methodsand statistical-model calculations. This experiment establishes a newexperimental data set on the excitation function of the$^{18}$Ne($\alpha,p$)$^{21}$Na reaction, revealing the significance of theexcited states' contributions to the total reaction cross section and allowingto separate the contribution of the $(\alpha,2p)$ reaction. The impact of themeasured cross section on thermal reaction rates is discussed.

Measurement of the $^{18}$Ne($\alpha,p$)$^{21}$Na reaction with ANASEN at $E_{c.m.} = $ 2.5-4 MeV