Coulomb breakup of 7Li for nuclear astrophysics

Details Coulomb breakup of 7Li for nuclear astrophysics Coulomb breakup of 7Li for nuclear astrophysics

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phrvc..63c5801t&link_type=abstract

Physical Review C, vol. 63, Issue 3, id. 035801

Astronomy and Astrophysics

Astrophysics

11

Coulomb Excitation, Single-Particle Levels And Strength Functions, Big Bang Nucleosynthesis, Projectile And Target Fragmentation

Scientific paper

A new Coulomb breakup experiment was performed for 7Li with an improved experimental technique and theoretical treatment. Energy spectra of α particles and tritons were examined to find the signature of post-Coulomb acceleration in the breakup of 7Li at Eαt=0. The data revealed the delayed nature of nonresonant breakup of astrophysical relevance that stems from quantum tunneling. Semiclassical discussions are presented of the lifetime of continuum states in 7Li and distortion of relative kinetic energies between α and t by post-Coulomb acceleration. Dynamical calculations of Coulomb breakup were performed by solving a time-dependent Schrödinger equation. A simple potential model of 7Li was employed. The dynamical calculations reasonably reproduced experimental cross sections for both resonant and nonresonant breakup with two key ingredients: higher order effects and mixture of E1 and E2 multipoles. Considering the dominant role of the first-order E1 nature in adiabatic Coulomb breakup, cross sections in the vα>=vt branch at 7 °-15 ° for 64Zn and 90Zr were used to deduce astrophysical S factors S(E) for t(α,γ)7Li. They exhibit a moderate energy dependence at small energies. The strongly energy-dependent S(E) resulted from the previous Coulomb breakup experiment based on cross sections with vα<=vt they are most likely Coulomb distorted and are revised in the present work.

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