Quantum Three-Body Calculation of the Nonresonant Triple-α Reaction Rate at Low Temperatures
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概要
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Triple-α reaction rate is re-evaluated by directly solving the three-body Schrodinger equation. The resonant and nonresonant processes are treated on the same footing using the continuum-discretized coupled-channels method for three-body scattering. An accurate description of the α-α nonresonant states significantly quenches the Coulomb barrier between the first two α-particles and the third α-particle. Consequently, the α-α nonresonant continuum states below the resonance at 92.04keV, i.e., the ground state of ^8Be, give a markedly larger contribution at low temperatures than that reported in previous studies. We show that Nomoto's method for three-body nonresonant capture processes, which is adopted in the NACRE compilation and many other studies, is a crude approximation of the accurate quantum three-body model calculation. We find an increase in triple-α reaction rate by about 20 orders of magnitude around 10^7K compared with the rate of NACRE.
- 理論物理学刊行会の論文
- 2009-10-25
著者
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Ogata Kazuyuki
Department Of Physics Kyushu University
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Kamimura Masayasu
Department Of Physics Kyushu University
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Kamimura Masayasu
Department Of Physics Kyushu University:riken Nishina Center
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KAN Masataka
Department of Physics, Kyushu University
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OGATA Kazuyuki
Department of Physics, Kyushu University:(Present office)Research Center for Nuclear Physics, Osaka University
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OGATA Kazuyuki
Advanced Science Research Center, Japan Atomic Energy Agency:Department of Physics, Kyushu University
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KAN Masataka
Department of Physics, Kyushu University:(Present office)Advanced Information Systems R & D Department, Hitachi Ltd.
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