THE FLUORINE DESTRUCTION IN STARS: FIRST EXPERIMENTAL STUDY OF THE 19F(p, α0)16O REACTION AT ASTROPHYSICAL ENERGIES

被引：99
|
作者：
La Cognata, M. [1 ]
Mukhamedzhanov, A. M. [2 ]
Spitaleri, C. [1 ,3 ]
Indelicato, I. [1 ,3 ]
Aliotta, M. [4 ]
Burjan, V. [5 ]
Cherubini, S. [1 ,3 ]
Coc, A. [6 ]
Gulino, M. [1 ,3 ]
Hons, Z. [5 ]
Kiss, G. G. [1 ]
Kroha, V. [5 ]
Lamia, L. [1 ,3 ]
Mrazek, J. [5 ]
Palmerini, S. [7 ,8 ]
Piskor, S. [5 ]
Pizzone, R. G. [1 ]
Puglia, S. M. R. [1 ,3 ]
Rapisarda, G. G. [1 ,3 ]
Romano, S. [1 ,3 ]
Sergi, M. L. [1 ,3 ]
Tumino, A. [1 ,9 ]
机构：
[1] Ist Nazl Fis Nucl, Lab Nazl Sud, I-95129 Catania, Italy
[2] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA
[3] Univ Catania, Dipartimento Fis & Astron, Catania, Italy
[4] Univ Edinburgh, Sch Phys & Astron, Edinburgh, Midlothian, Scotland
[5] ASCR, Inst Nucl Phys, Rez, Czech Republic
[6] Univ Paris 11, IN2P3, CSNSM CNRS, Orsay, France
[7] Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy
[8] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy
[9] Univ Enna Kore, Fac Ingn & Architettura, Enna, Italy
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 739卷 / 02期
基金：
美国国家科学基金会;
关键词：
nuclear reactions; nucleosynthesis; abundances; stars: abundances; stars: AGB and post-AGB; ASYMPTOTIC GIANT BRANCH; CROSS-SECTION; RELEVANT; RANGE; CARBON; O-18(P;
D O I：
10.1088/2041-8205/739/2/L54
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The F-19(p, alpha)O-16 reaction is an important fluorine destruction channel in the proton-rich outer layers of asymptotic giant branch (AGB) stars and it might also play a role in hydrogen-deficient post-AGB star nucleosynthesis. So far, available direct measurements do not reach the energy region of astrophysical interest (E-cm less than or similar to 300 keV), because of the hindrance effect of the Coulomb barrier. The Trojan Horse (TH) method was thus used to access this energy region, by extracting the quasi-free contribution to the H-2(F-19, alpha O-16)n and the F-19(He-3, alpha O-16)d reactions. The TH measurement of the alpha(0) channel shows the presence of resonant structures not observed before, which cause an increase of the reaction rate at astrophysical temperatures up to a factor of 1.7, with potential consequences for stellar nucleosynthesis.
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页数：6
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