Simplifying silicon burning: Application of quasi-equilibrium to {alpha} network nucleosynthesis

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While the need for accurate calculation of nucleosynthesis and the resulting rate of thermonuclear energy release within hydrodynamic models of stars and supernovae is clear, the computational expense of these nucleosynthesis calculations often force a compromise in accuracy to reduce the computational cost. To redress this trade-off of accuracy for speed, the authors present an improved nuclear network which takes advantage of quasi-equilibrium in order to reduce the number of independent nuclei, and hence the computational cost of nucleosynthesis, without significant reduction in accuracy. In this paper they will discuss the first application of this method, the further reduction in ... continued below

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10 p.

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Hix, W.R.; Thielemann, F.K.; Khokhlov, A.M. & Wheeler, J.C. December 1, 1997.

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  • Hix, W.R. Univ. of Texas, Austin, TX (United States). Dept. of Astronomy
  • Thielemann, F.K. Oak Ridge National Lab., TN (United States)
  • Khokhlov, A.M. Naval Research Lab., Washington, DC (United States). Lab. for Computational Physics and Fluid Dynamics
  • Wheeler, J.C. Univ. of Texas, Austin, TX (United States). Dept. of Astronomy

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While the need for accurate calculation of nucleosynthesis and the resulting rate of thermonuclear energy release within hydrodynamic models of stars and supernovae is clear, the computational expense of these nucleosynthesis calculations often force a compromise in accuracy to reduce the computational cost. To redress this trade-off of accuracy for speed, the authors present an improved nuclear network which takes advantage of quasi-equilibrium in order to reduce the number of independent nuclei, and hence the computational cost of nucleosynthesis, without significant reduction in accuracy. In this paper they will discuss the first application of this method, the further reduction in size of the minimal alpha network. The resultant QSE-reduced alpha network is twice as fast as the conventional alpha network it replaces and requires the tracking of half as many abundance variables, while accurately estimating the rate of energy generation. Such reduction in cost is particularly necessary for future generation of multi-dimensional models for supernovae.

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10 p.

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OSTI as DE98005053

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  • 2. Oak Ridge symposium on atomic and nuclear astrophysics, Oak Ridge, TN (United States), 2-6 Dec 1997

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  • Other: DE98005053
  • Report No.: ORNL/CP--97176
  • Report No.: CONF-971208--
  • Grant Number: AC05-96OR22464;FG02-96ER40983
  • Office of Scientific & Technical Information Report Number: 654167
  • Archival Resource Key: ark:/67531/metadc703063

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  • December 1, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • Aug. 25, 2016, 2:45 p.m.

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Hix, W.R.; Thielemann, F.K.; Khokhlov, A.M. & Wheeler, J.C. Simplifying silicon burning: Application of quasi-equilibrium to {alpha} network nucleosynthesis, article, December 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc703063/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.