Measurement of the <math display="inline"><mrow><mmultiscripts><mrow><mi>Ce</mi></mrow><mprescripts/><none/><mrow><mn>140</mn></mrow></mmultiscripts><mo stretchy="false">(</mo><mi mathvariant="normal">n</mi><mo>,</mo><mi>γ</mi><mo stretchy="false">)</mo></mrow></math> Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe

Amaducci, S.; Colonna, N.; Cosentino, L.; Cristallo, S.; Finocchiaro, P.; Krtička, M.; Massimi, C.; Mastromarco, M.; Mazzone, A.; Maugeri, E.A.

doi:10.1103/PhysRevLett.132.122701

Measurement of the ${}^{140}{Ce} (n, γ)$ Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe

n_TOF

Collaboration

Mar 21, 2024

8 pages

Published in:

Phys.Rev.Lett. 132 (2024) 12, 122701

Published: Mar 21, 2024

DOI:

10.1103/PhysRevLett.132.122701 (publication)

Experiments:

CERN-nTOF

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Abstract: (APS)

{}^{140}{Ce} (n, γ)

is a key reaction for slow neutron-capture (

s

-process) nucleosynthesis due to being a bottleneck in the reaction flow. For this reason, it was measured with high accuracy (uncertainty

\approx 5 %

) at the n_TOF facility, with an unprecedented combination of a high purity sample and low neutron-sensitivity detectors. The measured Maxwellian averaged cross section is up to 40% higher than previously accepted values. Stellar model calculations indicate a reduction around 20% of the

s

-process contribution to the Galactic cerium abundance and smaller sizeable differences for most of the heavier elements. No variations are found in the nucleosynthesis from massive stars.

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Measurement of the Ce140(n,γ) Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe

Citations per year

Measurement of the ${}^{140}{Ce} (n, γ)$ Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe