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The neutron capture cross section of $^{154}$Gd was measured from 1 eV to 300keV in the experimental area located 185 m from the CERN n\_TOF neutronspallation source, using a metallic sample of gadolinium, enriched to 67$\%$ in$^{154}$Gd. The capture measurement, performed with four C$_{6}$D$_{6}$scintillation detectors, has been complemented by a transmission measurementperformed at the GELINA time-of-flight facility (JRC-Geel), thus minimising theuncertainty related to sample composition. An accurate Maxwellian averagedcapture cross section (MACS) was deduced over the temperature range of interestfor s process nucleosynthesis modeling. We report a value of 880(50) mb for theMACS at $kT=30$ keV, significantly lower compared to values available inliterature. The new adopted $^{154}$Gd(n,$\gamma$) cross section reduces thediscrepancy between observed and calculated solar s-only isotopic abundancespredicted by s-process nucleosynthesis models.

Measurement of the $^{154}$Gd(n,$\gamma$) cross section and its astrophysical implications