Publications
Precise measurement of the thermal and stellar Fe 54 (n,γ) Fe 55 cross sections via accelerator mass spectrometry
- Author(s)
- A. Wallner, K. Buczak, Tamás Belgya, M. Bichler, L Coquard, I Dillmann, R. Golser, F. Kaeppeler, A. Karakas, W. Kutschera, C. Lederer, Alberto Mengoni, M Pignatari, A. Priller, Rene Reifarth, P. Steier, L. Szentmiklosi
- Abstract
Accelerator mass spectrometry (AMS) represents a complementary approach for precise measurements of neutron capture cross sections, e.g., for nuclear astrophysics. This technique, completely independent of previous experimental methods, was applied for the measurement of the Fe54(n,γ)Fe55 reaction. Following a series of irradiations with neutrons from cold and thermal to keV energies, the produced long-lived Fe55 nuclei (t1/2=2.744+-0.009) yr) were analyzed at the Vienna Environmental Research Accelerator. A reproducibility of about 1% could be achieved for the detection of Fe55, yielding cross-section uncertainties of less than 3%. Thus, this method produces new and precise data that can serve as anchor points for time-of-flight experiments. We report significantly improved neutron capture cross sections at thermal energy (σth=2.30±0.07 b) as well as for a quasi-Maxwellian spectrum of kT=25 keV (σ=30.3±1.2 mb) and for En=481±53 keV (σ=6.01±0.23 mb). The new experimental cross sections have been used to deduce improved Maxwellian-averaged cross sections in the temperature regime of the common s-process scenarios. The astrophysical impact is discussed by using stellar models for low-mass asymptotic giant branch stars.
- Organisation(s)
- Isotope Physics
- External organisation(s)
- Australian National University, Hungarian Academy of Sciences, Technische Universität Wien, Karlsruher Institut für Technologie, TRIUMF, Monash University, University of Edinburgh, European Organization for Nuclear Research (CERN), University of Hull, Johann Wolfgang Goethe-Universität Frankfurt am Main
- Journal
- Physical Review C
- Volume
- 96
- No. of pages
- 13
- ISSN
- 0556-2813
- DOI
- https://doi.org/10.1103/PhysRevC.96.025808
- Publication date
- 08-2017
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103014 Nuclear physics, 103004 Astrophysics
- Keywords
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/precise-measurement-of-the-thermal-and-stellar-fe-54-n-fe-55-cross-sections-via-accelerator-mass-spectrometry(80bab83d-3ac7-4062-baed-d8ecfe2f34ce).html