Speaker
Description
We report the new measurement of the photoneutron reaction for $^{45}$Sc performed using the quasi-monoenergetic $\gamma$-ray beam at the Shanghai Laser Electron Gamma Source (SLEGS). The obtained cross sections achieve an overall uncertainty better than 4\%. Compared with previous experimental data, the present results are systematically higher by a factor of approximately 1-2. By combining the present data with available $^{44}$Ca($p,\gamma$) reaction data, the parameters of the Hauser-Feshbach statistical model are further constrained. Using the TALYS code, we calculated the relevant reaction rates associated with $^{45}$Sc production channels. The sensitivity of $^{45}$Sc yield was investigated in both $\nu p$-process and O-Ne burning scenarios with respect to the newly determined $^{44}$Sc($n,\gamma$)$^{45}$Sc, $^{44}$Ca($p,\gamma$)$^{45}$Sc, and $^{41}$K($\alpha$,$\gamma$)$^{45}$Sc reaction rates. Our results indicate that the yield of $^{45}$Sc is only weakly affected by the updated nuclear physics inputs, suggesting that nuclear data uncertainties in these channels have a limited impact on the final $^{45}$Sc production in the considered astrophysical environments.
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