Quantum three-body calculation of nonresonant triple-α reaction rate at low temperatures

Details Quantum three-body calculation of nonresonant triple-α reaction rate at low temperatures Quantum three-body calculation of nonresonant triple-α reaction rate at low temperatures

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1269..268o&link_type=abstract

THE 10TH INTERNATIONAL SYMPOSIUM ON ORIGIN OF MATTER AND EVOLUTION OF GALAXIES: OMEG-2010. AIP Conference Proceedings, Volume 1

Other

Schroedinger Equation, Coupled Cluster Calculations, Potential Energy Functions, Alpha-Particle Effects, Relativistic Wave Equations, Coupled-Channel And Distorted-Wave Models, Coulomb Energies, Charge-Exchange Reactions

Scientific paper

Triple-α reaction rate is re-evaluated by directly solving the three-body Schrödinger 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, theα-α nonresonant continuum states 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 107 K compared with the rate of NACRE.

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