Discovery of an Exceptionally Strong β-Decay Transition of 20F and Implications for the Fate of Intermediate-Mass Stars

被引：33

作者：

Kirsebom, O. S. ^{[1
,2
]}

Jones, S. ^{[3
,4
]}

Stroemberg, D. F. ^{[5
,6
]}

Martinez-Pinedo, G. ^{[5
,6
]}

Langanke, K. ^{[5
,6
]}

Roepke, F. K. ^{[7
]}

Brown, B. A. ^{[8
]}

Eronen, T. ^{[9
]}

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

Hukkanen, M. ^{[9
]}

Idini, A. ^{[10
]}

Jokinen, A. ^{[9
]}

Kankainen, A. ^{[9
]}

Kostensalo, J. ^{[9
]}

Moore, I. ^{[9
]}

Moeller, H. ^{[5
,6
]}

Ohlmann, S. T. ^{[11
]}

Penttila, H. ^{[9
]}

Riisager, K. ^{[9
]}

Rinta-Antila, S. ^{[9
]}

Srivastava, P. C. ^{[12
]}

Suhonen, J. ^{[9
]}

Trzaska, W. H. ^{[9
]}

Aysto, J. ^{[9
]}

机构：

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

[2] Dalhousie Univ, Inst Big Data Analyt, Halifax, NS B3H 4R2, Canada

[3] Los Alamos Natl Lab, Computat Phys XCP, POB 1663, Los Alamos, NM 87545 USA

[4] Heidelberger Inst Theoret Studien, D-69118 Heidelberg, Germany

[5] Tech Univ Darmstadt, Inst Kernphys Theoriezentrum, D-64289 Darmstadt, Germany

[6] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany

[7] Zentrum Astron Univ Heidelberg, Inst Theoret Astrophys, D-69120 Heidelberg, Germany

[8] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

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

[10] Lund Univ, Dept Phys, Div Math Phys, LTH, POB 118, S-22100 Lund, Sweden

[11] Max Planck Comp & Data Facil, D-85748 Garching, Germany

[12] Indian Inst Technol, Dept Phys, Roorkee 247667, Uttar Pradesh, India

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 26期

基金：

芬兰科学院; 欧盟地平线“2020”;

关键词：

ONEMG CORES; EXPLOSIVE IGNITION; SUPERNOVAE; EVOLUTION; NUCLEOSYNTHESIS; PROPAGATION; COLLAPSE;

D O I：

10.1103/PhysRevLett.123.262701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A significant fraction of stars between 7 and 11 solar masses are thought to become supernovae, but the explosion mechanism is unclear. The answer depends critically on the rate of electron capture on Ne-20 in the degenerate oxygen-neon stellar core. However, because of the unknown strength of the transition between the ground states of Ne-20 and F-20, it has not previously been possible to fully constrain the rate. By measuring the transition, we establish that its strength is exceptionally large and that it enhances the capture rate by several orders of magnitude. This has a decisive impact on the evolution of the core, increasing the likelihood that the star is (partially) disrupted by a thermonuclear explosion rather than collapsing to form a neutron star. Importantly, our measurement resolves the last remaining nuclear physics uncertainty in the final evolution of degenerate oxygen-neon stellar cores, allowing future studies to address the critical role of convection, which at present is poorly understood.

引用

页数：6

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