Strength of the $E_{\text{p}}$=1.842 MeV resonance in the ${}^{40}$Ca(p,$\gamma$)${}^{41}$Sc reaction revisited

Abstract

The strength of the $E_{\mathrm{p}}=1.842$ MeV resonance in the ${}^{40}$Ca(p,$\gamma$)${}^{41}$Sc reaction is determined with two different methods: First, by an absolute strength measurement using calcium hydroxide targets, and second, relative to the well-determined strength of the resonance triplet at $E_{\alpha }$ = 4.5 MeV in the ${}^{40}$Ca($\alpha$,$\gamma$)${}^{44}$Ti reaction. The present new value of $\omega \gamma =(0.192\pm 0.017)$ eV is 37% (equivalent to $3.5\sigma$) higher than the evaluated literature value. In addition, the ratio of the strengths of the 1.842 MeV ${}^{40}$Ca(p,$\gamma$)${}^{41}$Sc and 4.5 MeV ${}^{40}$Ca($\alpha$,$\gamma$)${}^{44}$Ti resonances has been determined to be $0.0229\pm 0.0018$. The newly corrected strength of the 1.842-MeV resonance can be used in the future as a normalization point for experiments with calcium targets.

Submitted to Phys. Rev. C

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