Phys.Rev. C 103, 035804 (2021)

P.Adsley, F.Hammache, N.de Sereville, V.Alcindor, M.Assie, D.Beaumel, M.Chabot, M.Degerlier, C.Delafosse, T.Faestermann, F.Flavigny, S.P.Fox, R.Garg, A.Georgiadou, S.A.Gillespie, J.Guillot, V.Guimaraes, A.Gottardo, R.Hertenberger, J.Kiener, A.M.Laird, A.Lefebvre-Schuhl, I.Matea, A.Meyer, M.Mahgoub, L.Olivier, L.Perrot, J.Riley, I.Sivacek, I.Stefan, V.Tatischeff, H.-F.Wirth

Charged-particle branching ratios above the neutron threshold in ¹⁹F: Constraining ¹⁵N production in core-collapse supernovae

COMPILATION ¹⁹F; compiled data from the ENSDF database and from different nuclear reactions in literature for levels, J, π, Γ, Γ_p, and Γ_α.

NUCLEAR REACTIONS ¹⁹F(p, p'), E=16, 15 MeV; measured E(p), I(p), πα- and pp-coin using the Q3D magnetic spectrograph at Munich at E(p)=16 MeV, and Enge split-pole magnetic spectrometer, and double-sided silicon strip detector (DSSSD) detectors at Orsay at E(p)=15 MeV. ¹⁹F; deduced levels between 10.091 and 10.676 MeV in the region of astrophysical interest, width, branching ratios for proton and α decays from levels above the neutron binding energy in ¹⁹F. ¹⁵N, ¹⁸O; deduced energies of the emitted particles, matrices of experimental and simulated coincidence events from α and proton decays of neutron-unbound states in ¹⁹F. Relevance to ¹⁸F(n, α)¹⁵N and ¹⁸F(n, p)¹⁸O reaction rates for abundances of ¹⁵N and ¹⁸O in the helium-burning shell during core-collapse supernovae.

doi: 10.1103/PhysRevC.103.035804