Study of 179Hfm2 excitation

Abstract

Isomeric ratios of ¹⁷⁹Hf^m2,g yields in the (γ, n) reaction and the cross section for the ¹⁷⁹Hf^m2 population in the (α, p) reaction are measured for the first time at the end-point energies of 15.1 and 17.5 MeV for bremsstrahlung photons and 26 MeV for alpha particles. The results are σ = (1.1 ± 0.11) × 10⁻²⁷ cm² for the ¹⁷⁶Lu(α, p)¹⁷⁹Hf^m2 reaction and Y_m2/Y_g = (6.1 ± 0.3) × 10⁻⁶ and (3.7 ± 0.2) × 10⁻⁶ for the ¹⁸⁰Hf(γ, n)¹⁷⁹Hf^m22 reaction at Е_ep =15.1 and 17.5 MeV, respectively. The experimental data on the relative ¹⁷⁹Hf^m2 yield indicate a single-humped shape of the excitation function for the ¹⁸⁰Hf(γ, n)¹⁷⁹Hf^m2 reaction. Simulation is performed using the TALYS-1.4 and EMPIRE-3.2 codes.