An approach is presented to experimentally constrain previously unreachable (p, γ) reaction rates on nuclei far from stability in the astrophysical rp process. Energies of all critical resonances in the Cu57(p,γ)Zn58 reaction are deduced by populating states in Zn58 with a (d, n) reaction in inverse kinematics at 75 MeV/u, and detecting γ-ray-recoil coincidences with the state-of-the-art γ-ray tracking array GRETINA and the S800 spectrograph at the National Superconducting Cyclotron Laboratory. The results reduce the uncertainty in the Cu57(p,γ) reaction rate by several orders of magnitude. The effective lifetime of Ni56, an important waiting point in the rp process in x-ray bursts, can now be determined entirely from experimentally constrained reaction rates.
Determining the rp -process flow through Ni 56: Resonances in Cu 57 (p, gamma) Zn 58 identified with GRETINA
RECCHIA, FRANCESCO;
2014
Abstract
An approach is presented to experimentally constrain previously unreachable (p, γ) reaction rates on nuclei far from stability in the astrophysical rp process. Energies of all critical resonances in the Cu57(p,γ)Zn58 reaction are deduced by populating states in Zn58 with a (d, n) reaction in inverse kinematics at 75 MeV/u, and detecting γ-ray-recoil coincidences with the state-of-the-art γ-ray tracking array GRETINA and the S800 spectrograph at the National Superconducting Cyclotron Laboratory. The results reduce the uncertainty in the Cu57(p,γ) reaction rate by several orders of magnitude. The effective lifetime of Ni56, an important waiting point in the rp process in x-ray bursts, can now be determined entirely from experimentally constrained reaction rates.
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