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High resolution time-of-flight neutron capture measurements of the 136,138 Ba isotopes were carried out at the pulsed electron linac GELINA in the energy range 100 eV - 200 keV. The resonances of the 136,138/Ba(n,gamma) cross-sections were analysed, and stellar capture rates as a function of temperature kT determined. The capture cross-sections of s-only 136 Ba and the bottle neck 138 Ba give clues about the nature of the main s-process nucleosynthesis which is applied to reproduce heavy element abundances between mass number 90 and 200. Calculations were performed assuming a pulsed s-process initiated (i) by burning of only one neutron source and (ii) by combined burning of two neutron sources at different temperatures around 8 and 25 keV respectively.

Additional information

Authors: BEER H, Kernforschungszentrum, Institut für Kernphysik III, Karlsruhe (DE);CORVI F, JRC Geel (BE);MUTTI P, JRC Geel (BE);ATHANASSOPULOS K, JRC Geel (BE)
Bibliographic Reference: Paper presented: XX General Assembly, European Geophysical Society, Hamburg (DE), April 3-7, 1995
Availability: Available from (1) as Paper EN 39028 ORA
Record Number: 199511493 / Last updated on: 1995-11-03
Original language: en
Available languages: en
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