A measurement of the Ne-22(n, gamma)Ne-23 capture cross section at a stellar temperature of kT = 25 keV

Astronomy and Astrophysics – Astrophysics

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Absorption Cross Sections, Neon Isotopes, Nuclear Astrophysics, Nuclear Capture, Stellar Physics, High Energy Interactions, Neutron Sources, Nuclear Fusion, Van De Graaff Accelerators

Scientific paper

The capture cross section of Ne-22 has been determined by a fast cyclic activation technique. The measurements were carried out at the Karlsruhe 3.75 MV pulsed Van de Graaff accelerator using the L-7(p, n) reaction close to the reaction threshold to generate neutrons with a distribution resembling a Maxwell spectrum of kT = 25 keV. The activation samples consisted of a mixture of enriched Ne-22 (99.9 percent) and natural Kr-gas contained in stainless steel spheres (20 mm diameter and 0.5 mm wall thickness). The activity of the samples was counted with a high-resolution Ge(Li) detector via the characteristic 439 keV Ne-23 gamma-ray line. The Ne-22 capture cross section at kT = 25 keV was found to be 66.0 + or - 5.0 microbarn.

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