The fluorine destruction in stars: first experimental study of the 19F(p, α)16O reaction at astrophysical energies

被引：0

作者：

La Cognata, M. ^{[1
]}

Mukhamedzhanov, A. ^{[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. ^{[7
]}

Kroha, V. ^{[5
]}

Lamia, L. ^{[3
]}

Mrazek, J. ^{[5
]}

Palmerini, S. ^{[1
,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. ^{[9
]}

机构：

[1] INFN LNS, Catania, Italy

[2] Texas A&M Univ, Inst Cyclotron, College Stn, TX USA

[3] Univ Catania, Catania, Italy

[4] Univ Edinburgh, Sch Phys & Astron, Edinburgh, Midlothian, Scotland

[5] Nucl Phys Inst ASCR, Prague, Czech Republic

[6] CNRS, CSNSM, IN2P3, Orsay, France

[7] ATOMKI, Debrecen, Hungary

[8] Centro Siciliano Fis Nucleare Struttura Mat, Catania, Italy

[9] Kore Univ, Enna, Italy

来源：

ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2011 | 2012年 / 1484卷

关键词：

Indirect methods; resonant reactions; AGB stars; ASYMPTOTIC GIANT BRANCH; COULOMB BARRIER; LOW-MASS; NUCLEOSYNTHESIS;

D O I：

10.1063/1.4763456

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 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) reaction. The TH measurement of the alpha(0) channel, which is the dominant one at such energies, shows the presence of resonant structures not observed before that cause an increase of the reaction rate at astrophysical temperatures up to a factor of 1.7, with potential important consequences for stellar nucleosynthesis.

引用

页码：471 / 473

页数：3

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