Precise measurement of the thermal and stellar Fe 54 (n,γ) Fe 55 cross sections via accelerator mass spectrometry

A. Wallner, K. Buczak, T. Belgya, M. Bichler, L. Coquard, I. Dillmann, R. Golser, F. Käppeler, A. Karakas, W. Kutschera, C. Lederer, A. Mengoni, M. Pignatari, A. Priller, R. Reifarth, P. Steier, L. Szentmiklósi

Research output: Article

5 Citations (Scopus)

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.

Original languageEnglish
Article number025808
JournalPhysical Review C
Volume96
Issue number2
DOIs
Publication statusPublished - aug. 28 2017

Fingerprint

accelerators
mass spectroscopy
neutrons
absorption cross sections
cross sections
nuclear astrophysics
stellar models
asymptotic giant branch stars
thermal energy
astrophysics
irradiation
nuclei
temperature
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Precise measurement of the thermal and stellar Fe 54 (n,γ) Fe 55 cross sections via accelerator mass spectrometry. / Wallner, A.; Buczak, K.; Belgya, T.; Bichler, M.; Coquard, L.; Dillmann, I.; Golser, R.; Käppeler, F.; Karakas, A.; Kutschera, W.; Lederer, C.; Mengoni, A.; Pignatari, M.; Priller, A.; Reifarth, R.; Steier, P.; Szentmiklósi, L.

In: Physical Review C, Vol. 96, No. 2, 025808, 28.08.2017.

Research output: Article

Wallner, A, Buczak, K, Belgya, T, Bichler, M, Coquard, L, Dillmann, I, Golser, R, Käppeler, F, Karakas, A, Kutschera, W, Lederer, C, Mengoni, A, Pignatari, M, Priller, A, Reifarth, R, Steier, P & Szentmiklósi, L 2017, 'Precise measurement of the thermal and stellar Fe 54 (n,γ) Fe 55 cross sections via accelerator mass spectrometry', Physical Review C, vol. 96, no. 2, 025808. https://doi.org/10.1103/PhysRevC.96.025808
Wallner, A. ; Buczak, K. ; Belgya, T. ; Bichler, M. ; Coquard, L. ; Dillmann, I. ; Golser, R. ; Käppeler, F. ; Karakas, A. ; Kutschera, W. ; Lederer, C. ; Mengoni, A. ; Pignatari, M. ; Priller, A. ; Reifarth, R. ; Steier, P. ; Szentmiklósi, L. / Precise measurement of the thermal and stellar Fe 54 (n,γ) Fe 55 cross sections via accelerator mass spectrometry. In: Physical Review C. 2017 ; Vol. 96, No. 2.
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AU - Buczak, K.

AU - Belgya, T.

AU - Bichler, M.

AU - Coquard, L.

AU - Dillmann, I.

AU - Golser, R.

AU - Käppeler, F.

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AU - Kutschera, W.

AU - Lederer, C.

AU - Mengoni, A.

AU - Pignatari, M.

AU - Priller, A.

AU - Reifarth, R.

AU - Steier, P.

AU - Szentmiklósi, L.

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