A NOVEL APPROACH TO MEASURE THE CROSS SECTION OF THE18O(p, α)15N RESONANT REACTION IN THE 0-200 keV ENERGY RANGE
Author(s) -
M. La Cognata,
C. Spitaleri,
A. M. Mukhamedzhanov,
A. Banu,
S. Cherubini,
A. Coc,
V. Crucillà,
V. Z. Goldberg,
M. Gulino,
B. F. Irgaziev,
G. Kiss,
L. Lamia,
J. Mrázek,
R. G. Pizzone,
Chengbo Li,
G. G. Rapisarda,
S. Romano,
M. L. Sergi,
G. Tăbăcaru,
L. Trache,
R. E. Tribble,
W. H. Trzaska,
А. Туміно
Publication year - 2009
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1088/0004-637x/708/1/796
Subject(s) - physics , nucleosynthesis , asymptotic giant branch , nuclear astrophysics , nuclear reaction , s process , stars , reaction rate , range (aeronautics) , nuclear physics , astrophysics , measure (data warehouse) , stellar nucleosynthesis , atomic physics , database , computer science , composite material , biochemistry , chemistry , catalysis , materials science
The 18O(p, α)15N reaction is of primary importance to pin down the uncertainties, due to nuclear physics input, affecting present-day models of asymptotic giant branch stars. Its reaction rate can modify both fluorine nucleosynthesis inside such stars and oxygen and nitrogen isotopic ratios, which allow one to constrain the proposed astrophysical scenarios. Thus, an indirect measurement of the low-energy region of the 18O(p, α)15N reaction has been performed to access, for the first time, the range of relevance for astrophysical application. In particular, a full, high-accuracy spectroscopic study of the 20 and 90 keV resonances has been performed and the strengths deduced to evaluate the reaction rate and the consequences for astrophysics
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