Publikationen

Stellar and thermal neutron capture cross section of Be-9

Autor(en)
A. Wallner, M. Bichler, L. Coquard, I. Dillmann, O. Forstner, R. Golser, M. Heil, F. Käppeler, W. Kutschera, C. Lederer-Woods, M. Martschini, A. Mengoni, S. Merchel, L. Michlmayr, A. Priller, P. Steier, M. Wiescher
Abstrakt

The neutron capture cross section of Be-9 for stellar energies was measured via the activation technique using the Karlsruhe Van de Graaff accelerator in combination with accelerator mass spectrometry at the Vienna Environmental Research Accelerator. To characterize the energy region of interest for astrophysical applications, activations were performed in a quasistellar neutron spectrum of kT = 25 keV and for a spectrum at E-n = 473 +/- 53 keV. Despite the very small cross section, the method used provided the required sensitivity for obtaining fairly accurate results of 10.4 +/- 0.6 and 8.4 +/- 1.0 mu b, respectively. With these data it was possible to constrain the cross section shape up to the first resonances at 622 and 812 keV, thus allowing for the determination of Maxwellian-averaged cross sections at thermal energies between kT = 5 and 100 keV. In addition, we report a new experimental cross section value at thermal energy of sigma(th) = 8.31 +/- 0.52 mb.

Organisation(en)
Isotopenphysik
Externe Organisation(en)
Australian National University, Technische Universität Wien, Karlsruher Institut für Technologie, University of British Columbia (UBC), Friedrich-Schiller-Universität Jena, Helmholtz Inst Jena, GSI Helmholtzzentrum für Schwerionenforschung, University of Edinburgh, European Organization for Nuclear Research (CERN), Helmholtz-Zentrum Dresden-Rossendorf, University of Notre Dame
Journal
Physical Review C
Band
99
Anzahl der Seiten
11
ISSN
2469-9985
DOI
https://doi.org/10.1103/PhysRevC.99.015804
Publikationsdatum
01-2019
Peer-reviewed
Ja
ÖFOS 2012
103014 Kernphysik
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/stellar-and-thermal-neutron-capture-cross-section-of-be9(9b2bf064-eaec-4dc8-b876-9dabfd432ff1).html