Abstract
Neutron-rich light nuclei and their reactions play an important role in
the creation of chemical elements. Here, data from a Coulomb
dissociation experiment on N-20,N-21 are reported. Relativistic
N-20,N-21 ions impinged on a lead target and the Coulomb dissociation
cross section was determined in a kinematically complete experiment.
Using the detailed balance theorem, the N-19(n,gamma)N-20 and
N-20(n,gamma)N-21 excitation functions and thermonuclear reaction rates
have been determined. The N-19(n,gamma)N-20 rate is up to a factor of 5
higher at T < 1 GK with respect to previous theoretical calculations,
leading to a 10\% decrease in the predicted fluorine abundance.
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