Results 311 to 320 of about 3,422,985 (329)
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Nuclear Physics A, 1997
Abstract We survey the r-process of nucleosynthesis in matter flowing out radially from a nascent neutron star. We parameterize the expansion of the matter according to the entropy per baryon, the initial electron-to-baryon ratio, and the expansion timescale. We present here constraints on r-process conditions based on successful synthesis of the A
B.S. Meyer, J.S. Brown
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Abstract We survey the r-process of nucleosynthesis in matter flowing out radially from a nascent neutron star. We parameterize the expansion of the matter according to the entropy per baryon, the initial electron-to-baryon ratio, and the expansion timescale. We present here constraints on r-process conditions based on successful synthesis of the A
B.S. Meyer, J.S. Brown
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New Astronomy Reviews, 2004
Abstract We compare calculations of r-process abundances with recent astronomical observations from extremely metal-deficient, neutron-capture-rich halo stars. We derive criteria to determine Th and U chronometric ages, and deduce astrophysical conditions under which the observed abundance patterns can be obtained under r-like conditions.
K.-L. Kratz +3 more
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Abstract We compare calculations of r-process abundances with recent astronomical observations from extremely metal-deficient, neutron-capture-rich halo stars. We derive criteria to determine Th and U chronometric ages, and deduce astrophysical conditions under which the observed abundance patterns can be obtained under r-like conditions.
K.-L. Kratz +3 more
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Discrete Mathematics, Algorithms and Applications, 2009
R-processes are a new type of discrete stationary stochastic process. In this paper, we investigate the underlying structure of two special classes of r-processes. For each class, we will prove precisely when the associated multidigraph is perfect.
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R-processes are a new type of discrete stationary stochastic process. In this paper, we investigate the underlying structure of two special classes of r-processes. For each class, we will prove precisely when the associated multidigraph is perfect.
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The Site for R-Process Nucleosynthesis
Astrophysics and Space Science, 2002Following our hypothesis that each supernova (SN) event triggers star formation in the swept-up gas, so that newly formed stars inherit the elemental abundance pattern of individual SNe, we deduce the production sites and yields for r-process elements. We further show that a strong evidence for the origin of r-process nucleosynthesis products was just ...
Takuji Tsujimoto +2 more
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The R-process and nucleochronology
Physics Reports, 1991Abstract The r-process of nucleosynthesis is the process which is responsible for the synthesis of approximately half of the nuclear species in nature that are more massive than iron. This process of heavy-element synthesis involves the progressive buildup of heavier isotopes via neut ron captures proceeding on neutron-rich isotopes, interspersed by ...
John J. Cowan +2 more
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Capture Gamma-Ray Spectroscopy and Related Topics, 2013
An attempt has been made to identify the most critical nuclei for measurements at the new and developing facilities around the world for a better understanding of the rapid neutron capture process in terms of the input nuclear physics. A series of nucleosynthesis simulations have been carried out using some standard astrophysical conditions and several
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An attempt has been made to identify the most critical nuclei for measurements at the new and developing facilities around the world for a better understanding of the rapid neutron capture process in terms of the input nuclear physics. A series of nucleosynthesis simulations have been carried out using some standard astrophysical conditions and several
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2002
In 1957, Burbidge, Burbidge, Fowler and Hoyle (B2FH) provided a basis for forty years of research in various aspects of nucleosynthesis in stars. We will focus in this paper on progress in r-process nucleosynthesis, with emphasis on the most recent developments in nuclear physics.
K. -L. Kratz +3 more
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In 1957, Burbidge, Burbidge, Fowler and Hoyle (B2FH) provided a basis for forty years of research in various aspects of nucleosynthesis in stars. We will focus in this paper on progress in r-process nucleosynthesis, with emphasis on the most recent developments in nuclear physics.
K. -L. Kratz +3 more
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Changing the r-Process Paradigm
Nuclear Physics A, 2005Supernovae are now known to be far from symmetric. At the very least, rotation and convective instabilities alter the spherically symmetric picture producing asymmetric explosions and leaving behind aspherical neutron stars. These asymmetries may be critical to the mechanism behind supernova explosions.
C.L. Fryer, A.L. Hungerford, F.X. Timmes
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