Browsing by Author "Martinez-Pinedo, G."

Now showing items 1-20 of 20

    • Complete inclusion of parity-dependent level densities in the statistical description of astrophysical reaction rates 

      Loens, H. P.; Langanke, K.; Martinez-Pinedo, G.; Rauscher, T.; Thielemann, Friedrich-Karl (2008-09-04)
      Microscopic calculations show a strong parity dependence of the nuclear level density at low excitation energy of a nucleus. Previously, this dependence has either been neglected or only implemented in the initial and final ...

    • Core-collapse supernova explosions triggered by a quark-hadron phase transition during the early post-bounce phase 

      Fischer, T.; Sagert, I.; Pagliara, G.; Hempel, M.; Schaffner-Bielich, J.; Rauscher, T.; Thielemann, Friedrich-Karl; Kaeppeli, R.; Martinez-Pinedo, G.; Liebendoerfer, M. (2011-06)
      We explore explosions of massive stars, which are triggered via the quark-hadron phase transition during the early post-bounce phase of core-collapse supernovae. We construct a quark equation of state, based on the bag ...

    • The Impact of Fission on R-Process Calculations 

      Eichler, M.; Arcones, A.; Käppeli, R.; Korobkin, O.; Liebendörfer, M.; Martinez-Pinedo, G.; Panov, I. V.; Rauscher, T.; Rosswog, S.; Thielemann, F. K.; Winteler, C. (2016-01-05)
      We have performed r-process calculations in neutron star mergers (NSM) and jets of magnetohydrodynamically driven (MHD) supernovae. In these very neutron-rich environments the fission model of heavy nuclei has an impact ...

    • Influence of parity-dependence in the nuclear level density on the prediction of astrophysical reaction rates 

      Mocelj, D.; Rauscher, T.; Martinez-Pinedo, G.; Alhassid, Y. (2003-05-05)
      A simple description for obtaining the parity distribution of nuclear levels in the pf + g(9/2) shell as a function of excitation energy was recently derived. We implement this in a global nuclear level density model. In ...

    • Large-scale prediction of the parity distribution in the nuclear level density and application to astrophysical reaction rates 

      Mocelj, D.; Rauscher, T.; Martinez-Pinedo, G.; Langanke, K.; Pacearescu, L.; Faessler, A.; Thielemann, Friedrich-Karl; Alhassid, Y. (2007-04)
      A generalized method to calculate the excitation-energy dependent parity ratio in the nuclear level density is presented, using the assumption of Poisson distributed independent quasi particles combined with BCS occupation ...

    • Low-lying dipole response in the relativistic quasiparticle time blocking approximation and its influence on neutron capture cross sections 

      Litvinova, E.; Loens, H. P.; Langanke, K.; Martinez-Pinedo, G.; Rauscher, T.; Ring, P.; Thielemann, Friedrich-Karl; Tselyaev, V. (2009-05-15)
      We have computed dipole strength distributions for nickel and tin isotopes within the Relativistic Quasiparticle Time Blocking Approximation (RQTBA). These calculations provide a good description of data, including the ...

    • Mass measurements in the vicinity of the r p-process and the nu p-process paths with the Penning trap facilities JYFLTRAP and SHIPTRAP 

      Weber, C.; Elomaa, V. -V.; Ferrer, R.; Froehlich, C.; Ackermann, D.; Aystoe, J.; Audi, G.; Batist, L.; Blaum, K.; Block, M.; Chaudhuri, A.; Dworschak, M.; Eliseev, S.; Eronen, T.; Hager, U.; Hakala, J.; Herfurth, F.; Hessberger, F. P.; Hofmann, S.; Jokinen, A.; Kankainen, A.; Kluge, H. -J.; Langanke, K.; Martin, A.; Martinez-Pinedo, G.; Mazzocco, M.; Moore, I. D.; Neumayr, J. B.; Novikov, Yu. N.; Penttilae, H.; Plass, W. R.; Popov, A. V.; Rahaman, S.; Rauscher, T.; Rauth, C.; Rissanen, J.; Rodriguez, D.; Saastamoinen, A.; Scheidenberger, C.; Schweikhard, L.; Seliverstov, D. M.; Sonoda, T.; Thielemann, F. -K.; Thirolf, P. G.; Vorobjev, G. K. (2008-11)
      The masses of very neutron-deficient nuclides close to the astrophysical r p- and nu p-process paths have been determined with the Penning trap facilities JYFLTRAP at JYFL/Jyvaskyla and SHIPTRAP at GSI/Darmstadt. Isotopes ...

    • Network calculations for r-process nucleosynthesis 

      Petermann, I.; Martinez-Pinedo, G.; Arcones, A.; Hix, W. R.; Kelic, A.; Langanke, K.; Panov, I.; Rauscher, T.; Schmidt, K-H; Thielemann, Friedrich-Karl; Zinner, N. (IOP Publishing Ltd., 2010)
      The r-process is known to be responsible for the synthesis of about half of the elements heavier than iron, nevertheless its astrophysical site has not yet been clearly ascertained, but observations indicate that at least ...

    • Neutron-induced astrophysical reaction rates for translead nuclei 

      Panov, I. V.; Korneev, I. Yu; Rauscher, T.; Martinez-Pinedo, G.; Kelic-Heil, A.; Zinner, N. T.; Thielemann, Friedrich-Karl (2010-04)
      Neutron-induced reaction rates, including fission and neutron capture, are calculated in the temperature range 10(8)

    • Nuclear cross sections, nuclear structure and stellar nucleosynthesis 

      Thielemann, Friedrich-Karl; Argast, D.; Brachwitz, F.; Hix, W. R.; Hoflich, P.; Liebendoerfer, M.; Martinez-Pinedo, G.; Mezzacappa, A.; Panov, I.; Rauscher, T. (2003-05-05)
      The role of nuclear reactions (strong, weak and electromagnetic) and nuclear structure effects are discussed in a number of stellar applications. We address fusion cross sections in stellar evolution, neutrino-induced ...

    • Nuclear physics issues of the r-process 

      Thielemann, Friedrich-Karl; Kolbe, E.; Martinez-Pinedo, G.; Panov, I.; Rauscher, T.; Kratz, K.L.; Pfeiffer, B.; Rosswog, S. (World Scientific Publishing, 2003)
      The present paper aims at understanding r-process nucleosynthesis by addressing the nuclear physics involved, the necessary environment conditions in the (stellar) production sites, and the observational constraints. We ...

    • Nucleosynthesis and stellar evolution 

      Thielemann, Friedrich-Karl; Argast, D.; Brachwitz, F.; Martinez-Pinedo, G.; Rauscher, T.; Liebendoerfer, M.; Mezzacappa, A.; Hoflich, P.; Nomoto, K. (2002)
      Two of the basic building blocks of galaxies are stars and the interstellar medium. The evolution of the abundance composition in the latter and especially the enrichment of heavy elements as a function of space and time ...

    • Parity-dependence in the nuclear level density 

      Mocelj, D.; Rauscher, T.; Langanke, K.; Martinez-Pinedo, G.; Pacearescu, L.; Fassler, A.; Thielemann, Friedrich-Karl (2005-07-25)
      Astrophysical reaction rates are sensitive to the parity distribution at low excitation energies. We combine a formula for the energy-dependent parity distribution with a microscopic-macroscopic nuclear level density. This ...

    • Production of intermediate-mass and heavy nuclei 

      Thielemann, Friedrich-Karl; Froehlich, Carla; Hirschi, R.; Liebendoerfer, M.; Dillmann, I.; Mocelj, D.; Rauscher, T.; Martinez-Pinedo, G.; Langanke, K.; Farouqi, K.; Kratz, K.L.; Pfeiffer, B.; Panov, I.; Nadyozhin, D. K.; Blinnikov, S.; Bravo, E.; Hix, W. R.; Hoflich, P.; Zinner, N. T. (Elsevier, 2007)
      Nucleosynthesis is the science related to all astrophysical processes which are responsible for the abundances of the elements and their isotopes in the universe. The astrophysical sites are the big bang and stellar objects. ...

    • The r-, p-, and nu p-Process 

      Thielemann, Friedrich-Karl; Dillmann, I.; Farouqi, K.; Fischer, T.; Froehlich, C.; Kelic-Heil, A.; Korneev, I.; Kratz, K.L.; Langanke, K.; Liebendoerfer, M.; Panov, I. V.; Martinez-Pinedo, G.; Rauscher, T. (IOP Publishing Ltd., 2010)
      The processes discussed in this review are three of the four nucleosynthesis processes involved in producing heavy nuclei beyond Fe (not counting the rp-process in Xray bursts). Opposite to the fourth process (the s-process), ...

    • The Role of Fission in Neutron Star Mergers and Its Impact on the r-Process Peaks 

      Eichler, M.; Arcones, A.; Kelic, A.; Korobkin, O.; Langanke, K.; Marketin, T.; Martinez-Pinedo, G.; Panov, I.; Rauscher, T.; Rosswog, S.; Winteler, C.; Zinner, N. T.; Thielemann, F. K. (2015-07-15)
      Comparing observational abundance features with nucleosynthesis predictions of stellar evolution or explosion simulations, we can scrutinize two aspects: (a) the conditions in the astrophysical production site and (b) the ...

    • The role of fission in the r-process 

      Martinez-Pinedo, G.; Mocelj, D.; Zinner, N. T.; Kelic, A.; Langanke, K.; Panov, I.; Pfeiffer, B.; Rauscher, T.; Schmidt, K.-H.; Thielemann, Friedrich-Karl (Elsevier, 2007)
      We have developed a full set of fission rates that include spontaneous fission, neutron-induced fission, beta-delayed fission and, neutrino-induced fission, that are supplemented with realistic distributions of fission ...

    • The role of fission on neutron star mergers and its impact on the r-process peaks 

      Eichler, M.; Arcones, A.; Kelic, A.; Korobkin, O.; Langanke, K.; Marketin, T.; Martinez-Pinedo, G.; Panov, I.; Rauscher, T.; Rosswog, S.; Winteler, C.; Zinner, N. T.; Thielemann, F. K. (American Institute of Physics (AIP), 2016-06-21)
      The comparison between observational abundance features and those obtained from nucleosynthesis predictions of stellar evolution and/or explosion simulations can scrutinize two aspects: (a) the conditions in the astrophysical ...

    • Towards a parity-dependent level density for astrophysics 

      Mocelj, D.; Rauscher, T.; Thielemann, Friedrich-Karl; Martinez-Pinedo, G.; Langanke, K.; Pacearescu, L.; Fassler, A. (2005-10)
      Astrophysical reaction rates are sensitive to the parity distribution at low excitation energies. We combine a formula for the energy-dependent parity distribution with a microscopic-macroscopic nuclear level density. This ...

    • What are the astrophysical sites for the r-process and the production of heavy elements? 

      Thielemann, Friedrich-Karl; Arcones, A.; Kaeppeli, R.; Liebendoerfer, M.; Rauscher, T.; Winteler, C.; Froehlich, C.; Dillmann, I.; Fischer, T.; Martinez-Pinedo, G.; Langanke, K.; Farouqi, K.; Kratz, K. -L.; Panov, I.; Korneev, I. K. (2011-04)
      This article addresses three of the four nucleosynthesis processes involved in producing heavy nuclei beyond Fe (with a main focus on the r-process). Opposite to the fourth process (the s-process), which operates in stellar ...