Accelerator mass spectrometry measurements of the C-13(n,gamma)C-14 and N-14(n,p)C-14 cross sections

Author(s)

A. Wallner, M. Bichler, K. Buczak, I. Dillmann, F. Kaeppeler, A. Karakas, C. Lederer, M. Lugaro, K. Mair, A. Mengoni, Gabriele Schätzel, P. Steier, H. P. Trautvetter

Abstract

The technique of accelerator mass spectrometry (AMS), offering a complementary tool for sensitive studies of key reactions in nuclear astrophysics, was applied for measurements of the C13(n,γ)C14 and the N14(n,p)C14 cross sections, which act as a neutron poison in s-process nucleosynthesis. Solid samples were irradiated at Karlsruhe Institute of Technology with neutrons closely resembling a Maxwell-Boltzmann distribution for kT=25 keV, and also at higher energies between En=123 and 182 keV. After neutron irradiation the produced amount of C14 in the samples was measured by AMS at the Vienna Environmental Research Accelerator (VERA) facility. For both reactions the present results provide important improvements compared to previous experimental data, which were strongly discordant in the astrophysically relevant energy range and missing for the comparably strong resonances above 100 keV. For C13(n,γ) we find a four times smaller cross section around kT=25 keV than a previous measurement. For N14(n,p), the present data suggest two times lower cross sections between 100 and 200 keV than had been obtained in previous experiments and data evaluations. The effect of the new stellar cross sections on the s process in low-mass asymptotic giant branch stars was studied for stellar models of 2M initial mass, and solar and 1/10th solar metallicity.

Organisation(s)

Isotope Physics

External organisation(s)

Australian National University, Technische Universität Wien, Karlsruher Institut für Technologie, Hungarian Academy of Sciences, European Organization for Nuclear Research (CERN), Ruhr-Universität Bochum (RUB)

Journal

Physical Review C

Volume

93

No. of pages

12

ISSN

0556-2813

DOI

https://doi.org/10.1103/PhysRevC.93.045803

Publication date

04-2016

Peer reviewed

Yes

Austrian Fields of Science 2012

103014 Nuclear physics, 103004 Astrophysics

Keywords

ASJC Scopus subject areas

Nuclear and High Energy Physics

Portal url

https://ucris.univie.ac.at/portal/en/publications/accelerator-mass-spectrometry-measurements-of-the-c13ngammac14-and-n14npc14-cross-sections(086ad53e-ad9b-4933-b53a-be59a3058acb).html