Measurement of the 154Gd(n,γ ) cross section and its astrophysical implications
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AuthorPorras Sánchez, José Ignacio
S process154GdNeutron time-of-flightn_TOF
Mazzone, A., Cristallo, S., Aberle, O., Alaerts, G., Alcayne, V., Amaducci, S., ... & Barbagallo, M. (2020). Measurement of the 154Gd (n, γ) cross section and its astrophysical implications. Physics Letters B, 804, 135405. [https://doi.org/10.1016/j.physletb.2020.135405]
SponsorshipEUFRAT open access programme of the Joint Research Centre at Geel
The neutron capture cross section of 154Gd was measured from 1 eV to 300 keV in the experimental area located 185 m from the CERN n_TOF neutron spallation source, using a metallic sample of gadolinium, enriched to 67% in 154Gd. The capture measurement, performed with four C6D6 scintillation detectors, has been complemented by a transmission measurement performed at the GELINA time-of-flight facility (JRC-Geel), thus minimising the uncertainty related to sample composition. An accurate Maxwellian averaged capture cross section (MACS) was deduced over the temperature range of interest for s process nucleosynthesis modelling. We report a value of 880(50) mb for the MACS at kT = 30 keV, significantly lower compared to values available in literature. The new adopted 154Gd(n,γ ) cross section reduces the discrepancy between observed and calculated solar s-only isotopic abundances predicted by s-process nucleosynthesis models.