Measurement of the ¹⁹F(n,2n)¹⁸F Cross Section from 18 to 27 MeV

The ¹⁹F(n,2n)¹⁸F cross section is measured at neutron energies of 18, 21, 23, 25, and 27 MeV. Nearly monoenergetic neutrons bombarded Teflon [(C₂F₄)_n], zirconium, and gold samples. The ¹⁹F(n,2n)^I8F cross-section values are determined relative to ^natZr(n,xn)⁸⁹Zr and ¹⁹⁷Au(n,2n)¹⁹⁶Au from measurements of the ¹⁸F, ⁸⁹Zr, and ¹⁹⁶Au activities. Results are in agreement with previous measurements below 20 MeV and extend the usefulness of this reaction to 27 MeV.