Measurement of ¹³⁹La(n,γ) cross section at n_TOF

The capture cross section of the 139La has been measured relative to 197Au standard at n_TOF. We provide here a short description of the experimental apparatus and of the data analysis procedures. The extracted resonance parameters allow to calculate the fundamental nuclear quantities such as average spacing > D D 250 eV neutron strength functions S0 = (0.79 +/- 0.03)x 10(4), and S1 = (0.73 +/- 0.05)x10-4 and the Maxwellian-averaged capture cross section (MACS). The MACS is particularly useful for the determination of the abundance synthesized by the main component of the s process [3].