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"Longland, Steven"
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Investigation of \\(^{31}\\)P levels near the proton threshold by Nuclear Resonance Fluorescence and the impact on the \\(^{30}\\)Si(p,\\(\\gamma\\))\\(^{31}\\)P thermonuclear rate
We investigated the nuclear structure of \\(^{31}\\)P near the proton threshold using Nuclear Resonance Fluorescence (NRF) to refine the properties of key resonances in the \\(^{30}\\)Si(p,\\(\\gamma\\))\\(^{31}\\)P reaction, which is critical for nucleosynthesis in stellar environments. Excitation energies and spin-parities were determined for several states, including two unobserved resonances at \\(E_r\\) \\(=\\) \\(18.7\\)~keV and \\(E_r\\) \\(=\\) \\(50.5\\)~keV. The angular correlation analysis enabled the first unambiguous determination of the orbital angular momentum transfer for these states. These results provide a significant update to the \\(^{30}\\)Si(p,\\(\\gamma\\))\\(^{31}\\)P thermonuclear reaction rate, with direct implications for models of nucleosynthesis in globular clusters and other astrophysical sites. The revised rate is substantially lower than previous estimates at temperatures below \\(200\\)~MK, affecting predictions for silicon isotopic abundances in stellar environments. Our work demonstrates the power of NRF in constraining nuclear properties, and provides a framework for future studies of low-energy resonances relevant to astrophysical reaction rates.
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