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We measured the neutron capture cross section of 139La relative to 197Au in the energy
range of 0.6 eV to 9 keV at n_TOF, the neutron time-of-flight facility at CERN. After a
description of the experimental apparatus, we discuss data analysis procedures. The data were
fitted using R-matrix formalism to extract resonance parameters which, in turn, were used to
calculate average level spacings D0 = 268 ± 22 eV and D1 < 250 eV, and neutron strength
functions S0 = (0.79 ± 0.03)×10-4 and S1 = (0.73 ± 0.05)×10-4 for s- and p-wave resonances. The
data also were used to determine Maxwellian-averaged neutron capture cross sections which, in
turn, were used to calculate the 139La abundance synthesized in a stellar model of the main
component of the s process.
CitacióCalviño, F. [et al.]. Measurement of 139-La(n,gamma) cross section. A: International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics. "12 International Symposium on Capture Gamma-ray Spectroscopy and Related Topics". Notre Dame, Indiana: American Institute of Physics (AIP), 2005, p. 283-287.