Measurement of the 70Ge(n, γ) cross section up to 300 keV at the CERN n_TOF facility
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American Physical Society
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2019-10-17Referencia bibliográfica
Gawlik, A., Lederer-Woods, C., Andrzejewski, J., Battino, U., Ferreira, P., Gunsing, F., ... & Perkowski, J. (2019). Measurement of the Ge 70 (n, γ) cross section up to 300 keV at the CERN n_TOF facility. Physical Review C, 100(4), 045804. [https://doi.org/10.1103/PhysRevC.100.045804]
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This work was supported by the Austrian Science Fund FWF (Grant No. J3503), the Adolf Messer Foundation (Germany), the UK Science and Facilities Council (Grant No. ST/M006085/1), and the European Research Council ERC- 2015-StG Grant No. 677497. We also acknowledge support of Narodowe Centrum Nauki (NCN) (Grant No. UMO- 2016/22/M/ST2/00183) and from MSMT of the Czech Republic and the Croatian Science Foundation under the Project No. IP-2018-01-8570.Resumen
Neutron capture data on intermediate mass nuclei are of key importance to nucleosynthesis in the weak
component of the slow neutron capture processes, which occurs in massive stars. The (n, γ ) cross section on
70Ge, which is mainly produced in the s process, was measured at the neutron time-of-flight facility n_TOF at
CERN. Resonance capture kernels were determined up to 40 keV neutron energy and average cross sections
up to 300 keV. Stellar cross sections were calculated from kT = 5 keV to kT = 100 keV and are in very
good agreement with a previous measurement by Walter and Beer (1985) and recent evaluations. Average cross
sections are in agreement withWalter and Beer (1985) over most of the neutron energy range covered, while they
are systematically smaller for neutron energies above 150 keV.We have calculated isotopic abundances produced
in s-process environments in a 25 solar mass star for two initial metallicities (below solar and close to solar).
While the low metallicity model reproduces best the solar system germanium isotopic abundances, the close to
solar model shows a good global match to solar system abundances in the range of mass numbers A = 60–80.