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

Published online by Cambridge University Press:  05 March 2013

M. La Cognata ,
C. Spitaleri ,
A. M. Mukhamedzhanov ,
B. Irgaziev ,
R. E. Tribble ,
A. Banu ,
S. Cherubini ,
A. Coc ,
V. Crucillà  and
V. Z. Goldberg
...Show all authors
M. La Cognata
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
C. Spitaleri*
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
A. M. Mukhamedzhanov
Affiliation:
Cyclotron Institute Texas A&M University, MC #3366, College Station, TX 77843, USA
B. Irgaziev
Affiliation:
GIK Institute of Engineering Sciences and Technology, Toip-Tarbela Road Distt. Swabi Topi NWFP 23460, Pakistan
R. E. Tribble
Affiliation:
Cyclotron Institute Texas A&M University, MC #3366, College Station, TX 77843, USA
A. Banu
Affiliation:
Cyclotron Institute Texas A&M University, MC #3366, College Station, TX 77843, USA
S. Cherubini
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
A. Coc
Affiliation:
CSNSM CNRS/IN2P3 Université Paris Sud, 91405 Orsay, France
V. Crucillà
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
V. Z. Goldberg
Affiliation:
Cyclotron Institute Texas A&M University, MC #3366, College Station, TX 77843, USA
M. Gulino
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
G. G. Kiss
Affiliation:
ATOMKI, 4026 Debrecen, Bem tér 18/c, 4001 Debrecen, Hungary
L. Lamia
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
L. Chengbo
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy China Institute of Atomic Energy, Beijing, China
J. Mrazek
Affiliation:
Nuclear Physics Institute of the ASCR, CZ – 250 68 Rez, Czech Republic
R. G. Pizzone
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
S. M. R. Puglia
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
G. G. Rapisarda
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
S. Romano
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
M. L. Sergi
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
G. Tabacaru
Affiliation:
Cyclotron Institute Texas A&M University, MC #3366, College Station, TX 77843, USA
L. Trache
Affiliation:
Cyclotron Institute Texas A&M University, MC #3366, College Station, TX 77843, USA
W. Trzaska
Affiliation:
Department of Physics, P.O. Box 35 (YFL) FI-40014, University of Jyväskylä, Finland
A. Tumino
Affiliation:
INFN – Laboratori Nazionali del Sud, via S.Sofia 62, 95125 Catania, Italy DMFCI Università di Catania, Viale A. Doria 6, 95125 Catania, Italy
*
JCorresponding author. Email: [email protected]
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Abstract

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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
Type
s-Process and n Capture
Information
Publications of the Astronomical Society of Australia , Volume 26 , Issue 3 , 2009 , pp. 237 - 242
Copyright
Copyright © Astronomical Society of Australia 2009

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