First Accurate Normalization of the β-delayed α Decay of 16N and Implications for the 12C(α,γ)16O Astrophysical Reaction Rate

被引：7

作者：

Kirsebom, O. S. ^{[1
]}

Tengblad, O. ^{[2
]}

Lica, R. ^{[3
,4
]}

Munch, M. ^{[1
]}

Riisager, K. ^{[1
]}

Fynbo, H. O. U. ^{[1
]}

Borge, M. J. G. ^{[2
,3
]}

Madurga, M. ^{[3
]}

Marroquin, I. ^{[2
]}

Andreyev, A. N. ^{[5
,18
]}

Berry, T. A. ^{[6
]}

Christensen, E. R. ^{[1
]}

Fernandez, P. Diaz ^{[7
]}

Doherty, D. T. ^{[5
]}

Van Duppen, P. ^{[8
]}

Fraile, L. M. ^{[9
]}

Gallardo, M. C. ^{[9
]}

Greenlees, P. T. ^{[10
,11
]}

Harkness-Brennan, L. J. ^{[12
]}

Hubbard, N. ^{[1
,5
]}

Huyse, M. ^{[8
]}

Jensen, J. H. ^{[1
]}

Johansson, H. ^{[7
]}

Jonson, B. ^{[7
]}

Judson, D. S. ^{[12
]}

Konki, J. ^{[3
,10
,11
]}

Lazarus, I. ^{[13
]}

Lund, M. V. ^{[1
]}

Marginean, N. ^{[4
]}

Marginean, R. ^{[4
]}

Perea, A. ^{[2
]}

Mihai, C. ^{[4
]}

Negret, A. ^{[4
]}

Page, R. D. ^{[12
]}

Pucknell, V. ^{[13
]}

Rahkila, P. ^{[10
,11
]}

Sorlin, O. ^{[3
,14
]}

Sotty, C. ^{[4
]}

Swartz, J. A. ^{[1
]}

Sorensen, H. B. ^{[1
]}

Toernqvist, H. ^{[15
,16
]}

Vedia, V. ^{[9
]}

Warr, N. ^{[17
]}

De Witte, H. ^{[8
]}

机构：

[1] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

[2] CSIC, Inst Estruct Mat, E-28006 Madrid, Spain

[3] CERN, CH-1211 Geneva 23, Switzerland

[4] Horia Hulubei Natl Inst Phys & Nucl Engn IFIN HH, RO-077125 Bucharest, Romania

[5] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[6] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England

[7] Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden

[8] Katholieke Univ Leuven, Inst Kern Stralingsfys, B-3001 Heverlee, Belgium

[9] Univ Complutense Madrid, Grp Fis Nucl, E-28040 Madrid, Spain

[10] Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland

[11] Univ Helsinki, Helsinki Inst Phys, POB 64, FI-00014 Helsinki, Finland

[12] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England

[13] STFC Daresbury, Warrington WA4 4AD, Cheshire, England

[14] CNRS, IN2P3, CEA, DSM,GANIL, F-14076 Caen, France

[15] Tech Univ Darmstadt, Inst Kernphys, Darmstadt, Germany

[16] GSI Helmholtzzentrum Schwerionenforsch, Darmstadt, Germany

[17] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany

[18] JAEA, ASRC, Ibaraki 3191195, Japan

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 121卷 / 14期

基金：

英国科学技术设施理事会; 欧盟地平线“2020”; 欧洲研究理事会;

关键词：

CROSS-SECTION; ENERGY-LEVELS; LIGHT-NUCLEI; MATRIX; LEVEL; STATE;

D O I：

10.1103/PhysRevLett.121.142701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The C-12(alpha,gamma)O-16 reaction plays a central role in astrophysics, but its cross section at energies relevant for astrophysical applications is only poorly constrained by laboratory data. The reduced a width, gamma(11), of the bound 1(-) level in O-16 is particularly important to determine the cross section. The magnitude of gamma(11) is determined via sub-Coulomb a-transfer reactions or the beta-delayed a decay of N-16, but the latter approach is presently hampered by the lack of sufficiently precise data on the beta-decay branching ratios. Here we report improved branching ratios for the bound 1(-) level [b(beta,11) = (5.02 +/- 0.10) x 10(-2)] and for beta-delayed alpha emission [b(beta alpha) = (1.59 +/- 0.06) x 10(-5)]. Our value for b(beta alpha) is 33% larger than previously held, leading to a substantial increase in gamma(11). Our revised value for gamma(11) is in good agreement with the value obtained in a-transfer studies and the weighted average of the two gives a robust and precise determination of gamma(11), which provides significantly improved constraints on the C-12(alpha,gamma) cross section in the energy range relevant to hydrostatic He burning.

引用

页数：6

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