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.
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页数：5
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