Abstract
In a neutron-rich, α-rich environment that could arise during a supernova explosion the reaction chain (αn,γBe(α,nC dominates the creation of carbon, which leads to the creation of heavier elements in the subsequent r process [S. E. Woosley and R. D. Hoffman, Astrophys. J. 395, 202 (1992); B. S. Meyer, G. J. Matthews, W. M. Howard, S. G. Woosley, and R. D. Hoffman, ibid. 399, 656 (1992); W. M. Howard, S. Goriely, M. Rayet, and M. Arnould, ibid. 417, 713 (1993)]. For this reason the excitation function of the reaction (α,nC has been measured in the energy range from =366 keV up to 3552 keV (corresponding =254–2450 keV in the center-of-mass system) to obtain consistent data in the whole range, which were lacking in the literature. The measurements have been performed with a 4π detector and the yield contributions of the and neutron group could be resolved. Solid metallic targets of thickness 430 Å (7.75 μg/) and 650 Å (11.72 μg/) were used. Reaction rates and an analytic expression for them have been evaluated for 0.001≤≤10. © 1996 The American Physical Society.
- Received 10 October 1995
DOI:https://doi.org/10.1103/PhysRevC.53.2486
©1996 American Physical Society