Measurement of key resonance states for the 40P(p,g)31S reaction rate, and the production of intermediate-mass elements in nova explosions
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We report the first experimental constraints on spectroscopic factors and strengths of key resonances in the 30P(p, γ)31Sreaction critical for determining the production of intermediate-mass elements up to Ca in nova ejecta. The 30P(d, n)31Sreaction was studied in inverse kinematics using the GRETINA γ-ray array to measure the angle-integrated cross-sections of states above the proton threshold. In general, negative-parity states are found to be most strongly produced but the absolute values of spectroscopic factors are typically an order of magnitude lower than predicted by the shell-model calculations employing WBP Hamiltonian for the negative-parity states. The results clearly indicate the dominance of a single 3/2−resonance state at 196 keV in the region of nova burning T≈0.10–0.17GK, well within the region of interest for nova nucleosynthesis. Hydrodynamic simulations of nova explosions have been performed to demonstrate the effect on the composition of nova ejecta.
CitationKankainen, A., Woods, P., Schatz, H., Poxon-Pearson, T., Doherty, D., Bader, V., Baugher, T., Bazin, D., Brown, B., Browne, J., Estrade, A., Gade, A., Jose, J., Kontos, A., Langer, C., Lotay, G., Meisel, Z., Montes , F., Noji, S., Nunes , F., Perdikakis, G., Pereira, J., Recchia, F., Redpath, T., Stroberg, R., Scott , M., Seweryniak, D., Stevens, J., Weisshaar, D., Wimmer, K., Zegers, R. Measurement of key resonance states for the 40P(p,g)31S reaction rate, and the production of intermediate-mass elements in nova explosions. "Physics letters B", 17 Maig 2017, vol. 769, p. 549-553.