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Creators/Authors contains: "Sidhu, R S"

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review C)
    Here we report on the direct measurement of the resonance strengths of the E R lab = 647 keV and 1842 keV resonances in the Ca 40 ( p , γ ) Sc 41 reaction. At novae temperatures, 0.2 < T 9 < 0.7 , the Ca 40 ( p , γ ) Sc 41 reaction is governed by the low energy resonance at E R lab = 647 keV , whereas the E R lab = 1842 keV resonance serves as a normalization standard for nuclear reaction experiments within the astrophysically relevant energy range. For the E R lab = 647 keV resonance, we obtain a resonance strength ω γ = ( 2.51 ± 0 . 09 stat ± 0 . 22 syst ) meV , with an uncertainty a factor of 2.5 smaller than the previous direct measurement value. For the E R lab = 1842 keV resonance, we obtain a resonance strength ω γ = ( 0.148 ± 0 . 006 stat ± 0 . 013 syst ) eV , which is consistent with previous studies but deviates by 2 σ from the most recent measurement. Our results suggest Ca 40 to be a strong waiting point in the nucleosynthesis path of oxygen-neon (ONe) novae. Published by the American Physical Society2025 
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    Free, publicly-accessible full text available February 1, 2026
  2. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review Letters)
    The nuclear two-photon or double-gamma ( 2 γ ) decay is a second-order electromagnetic process whereby a nucleus in an excited state emits two gamma rays simultaneously. To be able to directly measure the 2 γ decay rate in the low-energy regime below the electron-positron pair-creation threshold, we combined the isochronous mode of a storage ring with Schottky resonant cavities. The newly developed technique can be applied to isomers with excitation energies down to ∼ 100     keV and half-lives as short as ∼ 10     ms . The half-life for the 2 γ decay of the first-excited 0 + state in bare Ge 72 ions was determined to be 23.9(6) ms, which strongly deviates from expectations. Published by the American Physical Society2024 
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    Full Text Available 
  3. ; ; ; ; ; ; ; ; ; ; et al (, Journal of Physics G: Nuclear and Particle Physics)
    Abstract Nuclear astrophysics is a field at the intersection of nuclear physics and astrophysics, which seeks to understand the nuclear engines of astronomical objects and the origin of the chemical elements. This white paper summarizes progress and status of the field, the new open questions that have emerged, and the tremendous scientific opportunities that have opened up with major advances in capabilities across an ever growing number of disciplines and subfields that need to be integrated. We take a holistic view of the field discussing the unique challenges and opportunities in nuclear astrophysics in regards to science, diversity, education, and the interdisciplinarity and breadth of the field. Clearly nuclear astrophysics is a dynamic field with a bright future that is entering a new era of discovery opportunities. 
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