Enhancement of the Triple Alpha Rate in a Hot Dense Medium.
| Autor: | Beard M; Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA., Austin SM; Joint Institute for Nuclear Astrophysics, National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824-1321, USA., Cyburt R; Joint Institute for Nuclear Astrophysics, National Superconducting Cyclotron Laboratory, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824-1321, USA. |
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| Jazyk: | angličtina |
| Zdroj: | Physical review letters [Phys Rev Lett] 2017 Sep 15; Vol. 119 (11), pp. 112701. Date of Electronic Publication: 2017 Sep 15. |
| DOI: | 10.1103/PhysRevLett.119.112701 |
| Abstrakt: | In a sufficiently hot and dense astrophysical environment the rate of the triple-alpha (3α) reaction can increase greatly over the value appropriate for helium burning stars owing to hadronically induced deexcitation of the Hoyle state. In this Letter we use a statistical model to evaluate the enhancement as a function of temperature and density. For a density of 10^{6} g cm^{-3} enhancements can exceed a factor of 100. In high temperature or density situations, the enhanced 3α rate is a better estimate of this rate and should be used in these circumstances. We then examine the effect of these enhancements on production of ^{12}C in the neutrino wind following a supernova explosion and in an x-ray burster. |
| Databáze: | MEDLINE |
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