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Abstract The$$^{90}$$ $_{}^{90}$ Zr(p,$$\gamma $$ $\gamma$ )$$^{91}$$ $_{}^{91}$ Nb reaction is one of the important reactions in the$$A\approx 90$$ $A\approx 90$ mass region and part of the nucleosynthesis path responsible for production of$$^{92}$$ $_{}^{92}$ Mo during the$$\gamma $$ $\gamma$ -process. Discrepant data in the literature provide a cross section that varies up to 30% within the Gamow window for the$$^{90}$$ $_{}^{90}$ Zr(p,$$\gamma $$ $\gamma$ )$$^{91}$$ $_{}^{91}$ Nb reaction. Thus, the cross section measurements of$$^{90}$$ $_{}^{90}$ Zr(p,$$\gamma $$ $\gamma$ )$$^{91}$$ $_{}^{91}$ Nb reaction were revisited using the$$\gamma $$ $\gamma$ -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$$^{90}$$ $_{}^{90}$ Zr(p,$$\gamma $$ $\gamma$ )$$^{91}$$ $_{}^{91}$ Nb is provided that is up to 20% higher than that obtained from thenon-smokercode. 

Abstract Neutron-induced nuclear reactions play an important role in the Big Bang Nucleosynthesis. Their excitation functions are, from an experimental point of view, usually difficult to measure. Nevertheless, in the last decades, big efforts have led to a better understanding of their role in the primordial nucleosynthesis network. In this work, we apply the Trojan Horse Method to extract the cross section at astrophysical energies for the³He(n,p)³H reaction after a detailed study of the²H(³He,pt)H three-body process. Data extracted from the present measurement are compared with other published sets. The reaction rate is also calculated, and the impact on the Big Bang nucleosynthesis is examined in detail.