Download or read book Neutrino induced Neucleosynthesis in Supernova Helium Shells written by Projjwal Banerjee and published by . This book was released on 2011 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Neutrino Induced Neutron Source in Helium Shell and R process Neutrosynthesis written by Dimitrij K. Nadjožin and published by . This book was released on 1997 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutrino induced Nucleosynthesis in Core collapse Supernovae written by and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Almost all of the 3{center dot}1053 ergs liberated in a core collapse supernova is radiated as neutrinos by the cooling neutron star. The neutrinos can excite nuclei in the mantle of the star by their neutral and charged current reactions. The resulting spallation reactions are an important nuleosynthesis mechanism that may be responsible for the galactic abundances of 7Li, 11B, 19F, 138La, 18°Ta, and number of other nuclei. 10 refs., 1 fig., 1 tab.
Download or read book Neutrinos written by Arnold S. Lavro and published by Nova Publishers. This book was released on 2002 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutrinos are one of the most abundant particles in the universe. Because they have very little interaction with matter, however, they are incredibly difficult to detect. Neutrinos are similar to the more familiar electron, with one crucial difference: neutrinos do not carry electric charge. Because neutrinos are electrically neutral, they are not affected by the electromagnetic forces which act on electrons. Three types of neutrinos are known. Each type or 'flavour' of neutrino is related to a charged particle (which gives the corresponding neutrino its name). Hence, the 'electron neutrino' is associated with the electron, and two other neutrinos are associated with heavier versions of the electron called the muon and the tau. The book presents citations from the literature for the last three years from the journal literature and the existent book literature. Access is provided by subject, author and title indexes.
Download or read book Supernovae and Nucleosynthesis written by David Arnett and published by Princeton University Press. This book was released on 2020-11-10 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book investigates the question of how matter has evolved since its origin in the Big Bang, from the cosmological synthesis of hydrogen and helium to the generation of the complex set of nuclei that comprise our world and our selves. A central theme is the evolution of gravitationally contained thermonuclear reactors, otherwise known as stars. Our current understanding is presented systematically and quantitatively, by combining simple analytic models with new state-of-the-art computer simulations. The narrative begins with the clues (primarily the solar system abundance pattern), the constraining physics (primarily nuclear and particle physics), and the thermonuclear burning in the Big Bang itself. It continues with a step-by-step description of how stars evolve by nuclear reactions, a critical investigation of supernova explosion mechanisms and the formation of neutron stars and of black holes, and an analysis of how such explosions appear to astronomers (illustrated by comparison with recent observations). It concludes with a synthesis of these ideas for galactic evolution, with implications for nucleosynthesis in the first generation of stars and for the solar system abundance pattern. Emphasis is given to questions that remain open, and to active research areas that bridge the disciplines of astronomy, cosmochemistry, physics, and planetary and space science. Extensive references are given.
Download or read book Advanced Stellar Astrophysics written by William Kenneth Rose and published by Cambridge University Press. This book was released on 1998-04-16 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: This advanced 1998 textbook on stellar astrophysics provides a comprehensive and self-contained introduction for graduate students.
Download or read book Supernovae Neutron Star Physics and Nucleosynthesis written by Debades Bandyopadhyay and published by Springer Nature. This book was released on 2022-03-28 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the interdisciplinary areas of nuclear physics, supernovae and neutron star physics. It addresses the physics and astrophysics of the spectacular supernova explosions, starting with the collapse of massive stars and ending with the birth of neutron stars or black holes. Recent progress in the understanding of core collapse supernova (CCSN) and observational aspects of future detections of neutrinos from CCSN explosions are discussed. The other main focus in this text is the novel phases of dense nuclear matter, its compositions and equation of state (EoS) from low to very high baryon density relevant to supernovae and neutron stars. The multi-messenger astrophysics of binary neutron star merger GW170817 and its relation to EoS through tidal deformability are also presented in detail. The synthesis of elements heavier than iron in the supernova and neutron star environment by the rapid (r)-process are treated here with special emphasis on the nucleosynthesis in the ejected material from GW170817. This monograph is written for graduate students and researchers in the field of nuclear astrophysics.
Download or read book Nucleosynthesis in Early Supernova Winds II written by and published by . This book was released on 2005 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the outstanding unsolved riddles of nuclear astrophysics is the origin of the so called ''p-process'' nuclei from A = 92 to 126. Both the lighter and heavier p-process nuclei are adequately produced in the neon and oxygen shells of ordinary Type II supernovae, but the origin of these intermediate isotopes, especially {sup 92,94}Mo and {sup 96,98}Ru, has long been mysterious. Here we explore the production of these nuclei in the neutrino-driven wind from a young neutron star. We consider such early times that the wind still contains a proton excess because the rates for [nu]{sub e} and positron captures on neutrons are faster than those for the inverse captures on protons. Following a suggestion by Froehlich et al. (2005), they also include the possibility that, in addition to the protons, [alpha]-particles, and heavy seed, a small flux of neutrons is maintained by the reaction p({bar {nu}}{sub e}, e)n. This flux of neutrons is critical in bridging the long waiting points along the path of the rp-process by (n, p) and (n, [gamma]) reactions. Using the unmodified ejecta histories from a recent two-dimensional supernova model by Janka, Buras, and Rampp (2003), they find synthesis of p-rich nuclei up to 1°2Pd. However, if the entropy of these ejecta is increased by a factor of two, the synthesis extends to 12°Te. Still larger increases in entropy, that might reflect the role of magnetic fields or vibrational energy input neglected in the hydrodynamical model, result in the production of numerous r-, s-, and p-process nuclei up to A H"170, even in winds that are proton-rich.
Download or read book Nuclei in the Cosmos written by F Kappeler and published by CRC Press. This book was released on 2020-11-26 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclei in the Cosmos, a volume of conference papers, gathers together astronomers, astrophysicists, and nuclear physicists for a thorough discussion of nucleosynthesis, its role in the evolution of the universe, and its intriguing possibilities as a diagnostic tool for stellar interiors. Nineteen invited papers provide a solid review of nucleosynthesis topics, and approximately another 70 papers bring you up-to-date on the forefront of research in this quickly-developing area.
Download or read book Neutrino Induced Light Element Synthesis written by and published by . This book was released on 1990 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the core of a massive star collapses to form a neutron star, the flux of neutrinos in the overlying shells of heavy elements becomes so great that, despite the small cross section, substantial nuclear transmutation is induced. Neutrinos, especially the higher energy [mu]- and [tau]-neutrinos, excite heavy elements and even helium to particle unbound levels. The evaporation of a single neutron or proton, and the back reaction of these nucleons on other species present, significantly alters the outcome of traditional nucleosynthesis calculations leading to a new process: [nu]-nucleosynthesis. The process was first studied by Domogatsky et al. and Woosley. Recent work by Epstein, Colgate, and Haxton and Woosley and Haxton suggested that a large number of elements could owe their existence in nature to [nu]-induced reactions in supernovae. A parametrized study of this process including shock wave propagation was carried out by Woosley et al. for selected zones of a 20 M{sub {circle dot}} star. Here we give preliminary results for a 25 M{sub {circle dot}} star, including all [nu]-reactions in all stellar zones.
Download or read book Supernovae written by David N. Schramm and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supernovae are among the most exciting things occurring in the universe. Much recent research has concentrated on phenomena related to supernovae. For example, the origin of the cosmic rays and the origin of the bulk of the heavy elements seem to be closely associated with the phenomenon of supernovae. With the discovery of the pulsar in the Crab, it seemed clear that supernovae were also intimately as sociated with the formation of neutron stars and perhaps even black holes. The purpose of the conference, of which this volume contains the proceedings, was to bring together the leaders of supernova re search, each of whom has concentrated on different aspects of the problem, to try to form a coherent picture both observationally and theoretically of our current understanding of supernovae. In so doing, key invited talks were presented on the light curves of super novae, both observationally and theoretically; on the possible uses of supernovae, for example in determination of the Hubble Constant; on the formation and evolution of supernova remnants, again both ob servationally and theoretically. The possibility that supernovae might explain quasars was also presented. A review of the current status of statistics of supernovae was presented, giving the rate at which they go off and the implications with regard to what mass stars are the progenitors for supernovae. Again, this was presented both from the observational point of view and from the theoretical stellar evolution point of view.
Download or read book Astronomy with Radioactivities written by Roland Diehl and published by Springer Science & Business Media. This book was released on 2010-10-02 with total page 577 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the reader to the field of nuclear astrophysics, i.e. the acquisition and reading of measurements on unstable isotopes in different parts of the universe. The authors explain the role of radioactivities in astrophysics, discuss specific sources of cosmic isotopes and in which special regions they can be observed. More specifically, the authors address stars of different types, stellar explosions which terminate stellar evolutions, and other explosions triggered by mass transfers and instabilities in binary stars. They also address nuclear reactions and transport processes in interstellar space, in the contexts of cosmic rays and of chemical evolution. A special chapter is dedicated to the solar system which even provides material samples. The book also contains a description of key tools which astrophysicists employ in those particular studies and a glossary of key terms in astronomy with radioactivities.
Download or read book Unstable Nuclei In Astrophysics Proceedings Of The International Workshop written by Shigeru Kubono and published by World Scientific. This book was released on 1992-01-24 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main theme of the workshop is to discuss problems of nucleosynthesis in the Universe, specifically in connections to the unstable atomic nuclei, which would play a crucial role in explosive burning processes. This subject is strongly backed up by an increasing interest in studying unstable nuclei in nuclear physics.The subjects include primordial nucleosynthesis, Hot-CNO cycle and rapid-proton process, neutrino-induced nucleosynthesis, equation of state of neutron-rich matter etc.
Download or read book Nucleosynthesis in Massive Stars and Supernovae written by William A. Fowler and published by . This book was released on 1965 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclei in the cosmos V written by Sotiris Harissopulos and published by Atlantica Séguier Frontières. This book was released on 1998 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Supernovae written by Albert G. Petschek and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: For millennia mankind has watched as the heavens move in their stately progression from night to night and from year to year, presaging with their changes the changing seasons. The sun, the moon, and the planets move in what appears to be an unchanging firmament, except occasionally when a new "star" appears. Among the new stars there are comets, novae, and finally supernovae, the subject of this book. Superstitious mankind regarded these events as significant portents and recorded them carefully so that we have records of supernovae that may reach back as far as 1300 B. C. (Clark and Stephenson, 1977; Murdin and Murdin, 1985). The Cygnus Loop, believed to be a 15,000-year-old supernova remnant at a distance of only 800 pc (Chevalier and Seward, 1988), must have awed our ancestors. Tycho's supernova of 1572, at a distance of 2500 pc, had a magnitude of -4. 0, comparable to Venus at its brightest, and Kepler's supernova of 1604 had a magnitude of - 3 or so. Thus the Cygnus Loop supernova might have had a magnitude of - 6 or so, and should have been readily visible in daytime. A supernova in Vela, about 8000 B. C. was comparably close, as was SN 1006, whose magnitude may have been -9. While most of the supernova records come from the Old World, the supernova of 1054 is recorded in at least one petroglyph in the American West.
Download or read book Lick Observatory Bulletins written by Lick Observatory and published by . This book was released on 1990 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
