Investigation of $^{31}$P levels near the proton threshold by Nuclear Resonance Fluorescence and the impact on the $^{30}$Si(p,$γ$)$^{31}$P thermonuclear rate
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913880850038784 |
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| author | Gribble, David Iliadis, Christian Janssens, Robert V. F. Friman-Gayer, Udo Ayangeakaa, Akaa D. Champagne, Art Churchman, Emily Fox, William Frye, Steven James, Xavier K. -H. Johnson, Samantha R. Longland, Richard Saracino, Antonella Sensharma, Nirupama Song, Kaixin Wegner, Clay |
| author_facet | Gribble, David Iliadis, Christian Janssens, Robert V. F. Friman-Gayer, Udo Ayangeakaa, Akaa D. Champagne, Art Churchman, Emily Fox, William Frye, Steven James, Xavier K. -H. Johnson, Samantha R. Longland, Richard Saracino, Antonella Sensharma, Nirupama Song, Kaixin Wegner, Clay |
| contents | 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,$γ$)$^{31}$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,$γ$)$^{31}$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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_05559 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Investigation of $^{31}$P levels near the proton threshold by Nuclear Resonance Fluorescence and the impact on the $^{30}$Si(p,$γ$)$^{31}$P thermonuclear rate Gribble, David Iliadis, Christian Janssens, Robert V. F. Friman-Gayer, Udo Ayangeakaa, Akaa D. Champagne, Art Churchman, Emily Fox, William Frye, Steven James, Xavier K. -H. Johnson, Samantha R. Longland, Richard Saracino, Antonella Sensharma, Nirupama Song, Kaixin Wegner, Clay Nuclear Experiment Solar and Stellar Astrophysics Nuclear Theory 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,$γ$)$^{31}$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,$γ$)$^{31}$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. |
| title | Investigation of $^{31}$P levels near the proton threshold by Nuclear Resonance Fluorescence and the impact on the $^{30}$Si(p,$γ$)$^{31}$P thermonuclear rate |
| topic | Nuclear Experiment Solar and Stellar Astrophysics Nuclear Theory |
| url | https://arxiv.org/abs/2506.05559 |