Cross-Section Measurements of the 86Kr(γ, n) Reaction to Probe the s-Process Branching at 85Kr

被引：54

作者：

Raut, R. ^{[1
,2
]}

Tonchev, A. P. ^{[1
,2
]}

Rusev, G. ^{[1
,2
]}

Tornow, W. ^{[1
,2
]}

Iliadis, C. ^{[2
,3
]}

Lugaro, M. ^{[4
]}

Buntain, J. ^{[4
]}

Goriely, S. ^{[5
]}

Kelley, J. H. ^{[2
,6
]}

Schwengner, R. ^{[7
]}

Banu, A. ^{[8
]}

Tsoneva, N. ^{[9
,10
]}

机构：

[1] Duke Univ, Dept Phys, Durham, NC 27708 USA

[2] Triangle Univ Nucl Lab, Durham, NC 27708 USA

[3] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27695 USA

[4] Monash Univ, Monash Ctr Astrophys MoCA, Clayton, Vic 3800, Australia

[5] Univ Libre Brussels, Inst Astron & Astrophys, B-1050 Brussels, Belgium

[6] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

[7] Helmholtz Zentrum Dresden Rossendorf, Inst Strahlenphys, D-01314 Dresden, Germany

[8] James Madison Univ, Dept Phys & Astron, Harrisonburg, VA 22807 USA

[9] Univ Giessen, Inst Theoret Phys, D-35392 Giessen, Germany

[10] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, BU-1784 Sofia, Bulgaria

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 11期

关键词：

NEUTRON-CAPTURE; STARS; NUCLEOSYNTHESIS; EVOLUTION; YIELDS; PREDICTIONS; MODELS; GRAINS; RATES;

D O I：

10.1103/PhysRevLett.111.112501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have carried out photodisintegration cross-section measurements on Kr-86 using monoenergetic photon beams ranging from the neutron separation energy, S-n = 9.86 MeV, to 13 MeV. We combine our experimental Kr-86(gamma, n)Kr-85 cross section with results from our recent Kr-86(gamma, gamma') measurement below the neutron separation energy to obtain the complete nuclear dipole response of Kr-86. The new experimental information is used to predict the neutron capture cross section of Kr-85, an important branching point nucleus on the abundance flow path during s-process nucleosynthesis. Our new and more precise Kr-85(n, gamma)Kr-86 cross section allows us to produce more precise predictions of the Kr-86 abundance from s-process models. In particular, we find that the models of the s process in asymptotic giant branch stars of mass <1.5M(circle dot), where the C-13 neutron source burns convectively rather than radiatively, represent a possible solution for the highest Kr-86:Kr-82 ratios observed in meteoritic stardust SiC grains.

引用

页数：5

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