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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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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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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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Impact of nuclear fission on r-process nucleosynthesis and origin of solar r-process elements
AIP Conference Proceedings, 2015Binary neutron star mergers (NSMs) are expected to be main production sites of r-process elements.
Shibagaki, Shota +3 more
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Physical conditions for the r-process [PDF]
AIP Conference Proceedings, 2012 Recent works show that the r-process can proceed by competition between neutron capture and β-decay in low temperature environments (< 5 × 108 K; cold r-process) where photo-disintegration plays no role. This is in contrast to the traditional picture of the r-process in high temperature environments (∼ 1 × 109 K; hot r-process) where the (n, γ)-(γ, n ...
Wanajo, Shinya +2 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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Operation of the r-process and cosmochronology
Physics Reports, 1993Abstract The rapid neutron capture process produced about half of the heavy elements in nature beyond the Fe-peak. In the past quite a number of astrophysical sites have been suggested, but none of them has yet been uniquely identified. Without assuming a particular site or model, we deduce the conditions responsible for the production of r-process ...
F.-K. Thielemann +5 more
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Neutron captures and the r-process
AIP Conference Proceedings, 2006In order to study possible neutron‐capture effects during an r‐process, it is necessary to perform fully dynamical simulations. We have performed such calculations within the model of an adiabatically expanding high‐entropy bubble of a SN II, using temperature‐dependent reaction rates including the NON‐SMOKER neutron‐capture rates of Rauscher et al..
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Abstract The ‘R’ processes provide a direction for a clinician to understand and guide the client through the mourning process and can be facilitated with eye movement desensitization and reprocessing therapy. This framework describes the processes that are important for adaptation to the loss. The R processes are: (1) recognize the loss,
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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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