New High-Precision Measurement of the Reaction Rate of the 18O(p, α)15N Reaction via THM

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Contents Vol 26(3)

doi:10.1071/AS08045

New High-Precision Measurement of the Reaction Rate of the ¹⁸O(p, α)¹⁵N Reaction via THM

M. La Cognata ^A ^B, C. Spitaleri ^A ^B ^J, A. M. Mukhamedzhanov ^C, B. Irgaziev ^D, R. E. Tribble ^C, A. Banu ^C, S. Cherubini ^A ^B, A. Coc ^E, V. Crucillà ^A ^B, V. Z. Goldberg ^C, M. Gulino ^A ^B, G. G. Kiss ^F, L. Lamia ^A ^B, L. Chengbo ^A ^H, J. Mrazek ^G, R. G. Pizzone ^A ^B, S. M. R. Puglia ^A ^B, G. G. Rapisarda ^A ^B, S. Romano ^A ^B, M. L. Sergi ^A ^B, G. Tabacaru ^C, L. Trache ^C, W. Trzaska ^I, A. Tumino ^A ^B

^A INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy
^B DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
^C Cyclotron Institute TexasA&M University, MC #3366, College Station, TX 77843, USA
^D GIK Institute of Engineering Sciences and Technology, Toip-Tarbela Road Distt. Swabi Topi NWFP 23460, Pakistan
^E CSNSM CNRS/IN2P3 Université Paris Sud, 91405 Orsay, France
^F ATOMKI, 4026 Debrecen, Bem tér 18/c, 4001 Debrecen, Hungary
^G Nuclear Physics Institute of the ASCR, CZ – 250 68 Rez, Czech Republic
^H China Institute of Atomic Energy, Beijing, China
^I Department of Physics, P.O. Box 35 (YFL) FI-40014, University of Jyväskylä, Finland
^J Corresponding author. Email: spitaleri@lns.infn.it





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Publications of the Astronomical Society of Australia 26(3) 237–242 http://dx.doi.org/10.1071/AS08045
Submitted: 19 November 2008 Accepted: 22 December 2008 Published online: 4 September 2009

Abstract

The ¹⁸O(p, α)¹⁵N reaction rate has been extracted by means of the Trojan-Horse method. For the first time the contribution of the 20-keV peak has been directly evaluated, giving a value about 35% larger than previously estimated. The present approach has allowed to improve the accuracy of a factor 8.5, as it is based on the measured strength instead of educated guesses or spectroscopic measurements. The contribution of the 90-keV resonance has been determined as well, which turned out to be of negligible importance to astrophysics.

Keywords: nuclear reactions, nucleosynthesis, abundances