Browsing by Author "Langanke, K."

Now showing items 1-16 of 16

    • 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 ...

    • Element synthesis in stars 

      Thielemann, Friedrich-Karl; Brachwitz, F.; Freiburghaus, C.; Kolbe, E.; Martinez-Pinedo, Gabriel; Rauscher, T.; Rembges, F.; Hix, W. R.; Liebendoerfer, M.; Mezzacappa, A.; Kratz, K.L.; Pfeiffer, B.; Langanke, K.; Nomoto, K.; Rosswog, S.; Schatz, H.; Wiescher, Michael (Elsevier, 2001)
      Except for H-1, H-2, He-3, He-4, and Li-7, originating from the Big Bang, all heavier elements are made in stellar evolution and stellar explosions. Nuclear physics, and in many cases nuclear structure far from stability, ...

    • 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 ...

    • Nucleosynthesis of heavy elements in massive stars 

      Heger, A.; Woosley, S.E.; Langanke, K.; Kolbe, E.; Rauscher, T.; Hoffman, R. D. (2003-05-05)
      We present nucleosynthesis results form calculations that follow the evolution of massive stars from their birth on the main sequence through their explosion as supernovae. Our simulations include all relevant isotopes and ...

    • 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 r-process : Supernovae and other sources of the heaviest elements 

      Thielemann, Friedrich-Karl; Mocelj, D.; Panov, I.; Kolbe, E.; Rauscher, T.; Kratz, K.L.; Farouqi, K.; Pfeiffer, B.; Martinez-Pinedo, Gabriel; Kelic, A.; Langanke, K.; Schmidt, K. -H.; Zinner, N. (2007-05)
      Rapid neutron capture in stellar explosions is responsible for the heaviest elements in nature, up to Th, U and beyond. This nucleosynthesis process, the r-process, is unique in the sense that a combination of nuclear ...

    • 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 ...