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Abstract The$$^{90}$$ Zr(p,$$\gamma $$ )$$^{91}$$ Nb reaction is one of the important reactions in the$$A\approx 90$$ mass region and part of the nucleosynthesis path responsible for production of$$^{92}$$ Mo during the$$\gamma $$ -process. Discrepant data in the literature provide a cross section that varies up to 30% within the Gamow window for the$$^{90}$$ Zr(p,$$\gamma $$ )$$^{91}$$ Nb reaction. Thus, the cross section measurements of$$^{90}$$ Zr(p,$$\gamma $$ )$$^{91}$$ Nb reaction were revisited using the$$\gamma $$ -summing technique. The results are consistent with the lower-value cross sections found in the literature. Based on the new data an updated reaction rate for$$^{90}$$ Zr(p,$$\gamma $$ )$$^{91}$$ Nb is provided that is up to 20% higher than that obtained from thenon-smokercode.more » « less
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Here we report on the direct measurement of the resonance strengths of the and 1842 keV resonances in the reaction. At novae temperatures, , the reaction is governed by the low energy resonance at , whereas the resonance serves as a normalization standard for nuclear reaction experiments within the astrophysically relevant energy range. For the resonance, we obtain a resonance strength , with an uncertainty a factor of 2.5 smaller than the previous direct measurement value. For the resonance, we obtain a resonance strength , which is consistent with previous studies but deviates by from the most recent measurement. Our results suggest to be a strong waiting point in the nucleosynthesis path of oxygen-neon (ONe) novae. Published by the American Physical Society2025more » « lessFree, publicly-accessible full text available February 1, 2026
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