Direct total cross section measurement of the 16O(α,γ )20Ne reaction at Ec.m. = 2.26 MeV

摘要

The first reaction of the stellar helium-burning stage is thentriple-α process, which produces 12C. After the production ofn12C, other α-cluster nuclei can, in principle, be produced. Atntypical helium-burning temperatures of 1–3 × 108 K(effectivenenergy for helium-burning reactions, Ec.m. ≈ 0.3MeV), theirnproduction is, however, hindered by the increasing Coulombnbarriers [1]. Thus, two of themain end products of steady-statenhelium burning are 12C and 16O, with their ratio determined innpart by the 16O(α,γ )20Ne rate. This ratio also determines thenabundances of the products of later carbon burning, mainlyn20Ne, 23Na, 23,24Mg, and 28Si, compared to the products ofnoxygen burning, like aluminium [1].