Arcones, A. and Martínez-Pinedo, G. and O'Connor, E. and Schwenk, A. and Janka, H.-Th. and Horowitz, C. J. and Langanke, K. (2008) Influence of light nuclei on neutrino-driven supernova outflows. Physical Review C, 78 (1). Art. No. 015806. ISSN 0556-2813 http://resolver.caltech.edu/CaltechAUTHORS:ARCprc08
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We study the composition of the outer layers of a protoneutron star and show that light nuclei are present in substantial amounts. The composition is dominated by nucleons, deuterons, tritons and alpha particles; 3He is present in smaller amounts. This composition can be studied in laboratory experiments with new neutron-rich radioactive beams that can reproduce similar densities and temperatures. After including the corresponding neutrino interactions, we demonstrate that light nuclei have a small impact on the average energy of the emitted electron neutrinos, but are significant for the average energy of antineutrinos. During the early post-explosion phase, the average energy of electron antineutrinos is slightly increased, while at later times during the protoneutron star cooling it is reduced by about 1 MeV. The consequences of these changes for nucleosynthesis in neutrino-driven supernova outflows are discussed.
|Additional Information:||©2008 The American Physical Society. (Received 24 May 2008; published 24 July 2008) A.A. acknowledges support by the Deutsche Forschungsgemeinschaft through contract SFB 634 “Nuclear structure, nuclear astrophysics and fundamental experiments at small momentum transfers at the S-DALINAC”. The work of E.O. and A.S. is supported by the Natural Sciences and Engineering Research Council of Canada (NSERC). TRIUMF receives federal funding via a contribution agreement through the National Research Council of Canada. The work of H.-T.J. is supported by the Deutsche Forschungsgemeinschaft through the Transregional Collaborative Research Centers SFB/TR 27 “Neutrinos and Beyond” and SFB/TR 7 “Gravitational Wave Astronomy”, and the Cluster of Excellence EXC 153 “Origin and Structure of the Universe” (http://www.universecluster.de). The work of C.J.H. is supported in part by DOE grant DE-FG02-87ER40365.|
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|Deposited On:||26 Jul 2008 03:03|
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