Phys.Rev. C 95, 014613 (2017)

M.Heine, for the R3B Collaboration

Determination of the neutron-capture rate of ¹⁷C for r-process nucleosynthesis

NUCLEAR REACTIONS Pb(¹⁸C, X), E=425 MeV/nucleon, [secondary ¹⁸C beam from ⁹Be(⁴⁰Ar, X), E=490 MeV/nucleon primary reaction, and using FRS fragment separator at GSI]; measured mass distribution of carbon fragments after ¹⁸C breakup in coincidence with neutrons in the LAND detector, reaction products by R3B-LAND setup at GSI, Eγ, Iγ using Crystal Ball array. ¹⁷C; deduced levels, J, π, σ, spectroscopic factors for one-neutron removal in ¹⁸C from Coulomb dissociation, exclusive differential Coulomb dissociation cross sections with respect to ¹⁷C-n relative energy. Comparison with theoretical calculations using shell model in the psd model space with WBP interaction. ¹⁷C(n, γ), T₉=0.01-10; deduced nuclear reaction rates, abundance as a function of mass number with updated ¹⁷C capture rates. Comparison with Hauser-Feshbach, and direct capture model theoretical calculations.

doi: 10.1103/PhysRevC.95.014613