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Investigation of the 7Li(p,n) neutron fields at high energies
oleh: Brückner Benjamin, Erbacher Philipp, Göbel Kathrin, Heftrich Tanja, Khasawneh Kafa, Kurtulgil Deniz, Langer Christoph, Nolte Ralf, Reich Markus, Reifarth René, Thomas Benedikt, Weigand Mario, Wiescher Michael, Volknandt Meiko
Format: | Article |
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Diterbitkan: | EDP Sciences 2022-01-01 |
Deskripsi
The neutron activation method is well-suited to investigate neutron-capture cross sections relevant for the main s-process component. Neutrons can be produced via the 7Li(p,n) reaction with proton energies of 1912 keV at e.g. Van de Graaff accelerators, which results in a quasi-Maxwellian spectrum of neutrons corresponding to a temperature of kBT = 25 keV. However, the weak s-process takes place in massive stars at temperatures between 25 and 90 keV. Simulations using the PINO code [2] suggest that a Maxwellian spectrum for higher energies, e.g. kBT = 90 keV, can be approximated by a linear combination of different neutron spectra. To validate the PINO code at proton energies Ep ≠ 1912 keV, neutron time-of-flight measurements were carried out at the PTB Ion Accelerator Facility (PIAF) at the Physikalisch-Technische Bundesanstalt in Braunschweig, Germany.