Browsing by Author "Thielemann, Friedrich-Karl"

Now showing items 1-20 of 60

    • Applicability of the Hauser-Feshbach approach for the determination of astrophysical reaction rates 

      Rauscher, T.; Thielemann, Friedrich-Karl; Kratz, K.L. (1997-08-04)
      Nuclear Astrophysics requires the knowledge of reaction rates over a wide range of nuclei and temperatures. In recent calculations the nuclear level density – as an important ingredient to the statistical model (Hauser-Feshbach) ...

    • Astrophysical and nuclear physics aspects of the r-process 

      Thielemann, Friedrich-Karl; Freiburghaus, C.; Rauscher, T.; Kratz, K.L.; Pfeiffer, B.; Cowan, J.J. (World Scientific Publishing, 1998)
      The formation of elements as heavy as Th and U and beyond is due to the rapid neutron-capture process (r-process), which causes the production of highly unstable nuclei near the neutron drip-line and functions via neutron ...

    • Astrophysical conditions for an r-process in the high-entropy wind scenario of type II supernovae 

      Farouqi, K.; Freiburghaus, C.; Kratz, K. L.; Pfeiffer, B.; Rauscher, T.; Thielemann, Friedrich-Karl (2005-07-25)
      Within a full dynamical parameter study including freezeout effects, we have determined the astrophysical conditions for an r-process in the so-called "neutrino-wind" scenario of core-collapse type II supernovae (SNII). ...

    • The astrophysical r-process : A comparison of calculations following adiabatic expansion with classical calculations based on neutron densities and temperatures 

      Freiburghaus, C.; Rembges, J.F.; Rauscher, T.; Kolbe, E.; Thielemann, Friedrich-Karl; Kratz, K.L.; Pfeiffer, B.; Cowan, J.J. (1999-05-01)
      The rapid neutron-capture process (r-process) encounters unstable nuclei far from beta-stability. Therefore its observable features, like the abundances, witness (still uncertain) nuclear structure as well as the conditions ...

    • Astrophysical reaction rates from statistical model calculations 

      Rauscher, T.; Thielemann, Friedrich-Karl (2000)
      Theoretical reaction rates in the temperature range 0.01 x 10(9) less than or equal to T(K) less than or equal to 10.0 x 10(9) are calculated in the statistical model (Hauser-Feshbach formalism) for targets with 10 less ...

    • Calculations of fission rates for r-process nucleosynthesis 

      Panov, I.; Kolbe, E.; Pfeiffer, B.; Rauscher, T.; Kratz, K.L.; Thielemann, Friedrich-Karl (2005-01-24)
      Fission plays an important role in the r-process which is responsible; not only for the yields of transuranium isotopes, but may have a strong influence on the formation of the majority of heavy nuclei due to fission ...

    • Capture of a particles by isospin-symmetric nuclei 

      Rauscher, T.; Thielemann, Friedrich-Karl; Gorres, J.; Wiescher, M. (2000-08-14)
      The reaction rates for ct capture processes on self-conjugate nuclei in the mass range A = 20-40 have been investigated. The rates were calculated using the statistical model code NON-SMOKER taking into account isospin ...

    • Catching Element Formation In The Act 

      Fryer, Chris L.; Timmes, Frank; Hungerford, Aimee L.; Couture, Aaron; Adams, Fred; Aoki, Wako; Arcones, Almudena; Arnett, David; Auchettl, Katie; Avila, Melina; Badenes, Carles; Baron, Eddie; Bauswein, Andreas; Beacom, John; Blackmon, Jeff; Blondin, Stephane; Bloser, Peter; Boggs, Steve; Boss, Alan; Brandt, Terri; Bravo, Eduardo; Brown, Ed; Brown, Peter; Budtz-Jorgensen, Steve Bruenn Carl; Burns, Eric; Calder, Alan; Caputo, Regina; Champagne, Art; Chevalier, Roger; Chieffi, Alessandro; Chipps, Kelly; Cinabro, David; Clarkson, Ondrea; Clayton, Don; Coc, Alain; Connolly, Devin; Conroy, Charlie; Cote, Benoit; Couch, Sean; Dauphas, Nicolas; deBoer, Richard James; Deibel, Catherine; Denisenkov, Pavel; Desch, Steve; Dessart, Luc; Diehl, Roland; Doherty, Carolyn; Dominguez, Inma; Dong, Subo; Dwarkadas, Vikram; Fan, Doreen; Fields, Brian; Fields, Carl; Filippenko, Alex; Fisher, Robert; Foucart, Francois; Fransson, Claes; Frohlich, Carla; Fuller, George; Gibson, Brad; Giryanskaya, Viktoriya; Gorres, Joachim; Goriely, Stephane; Grebenev, Sergei; Grefenstette, Brian; Grohs, Evan; Guillochon, James; Harpole, Alice; Harris, Chelsea; Harris, J. Austin; Harrison, Fiona; Hartmann, Dieter; Hashimoto, Masa-aki; Heger, Alexander; Hernanz, Margarita; Herwig, Falk; Hirschi, Raphael; Hix, Raphael William; Hoflich, Peter; Hoffman, Robert; Holcomb, Cole; Hsiao, Eric; Iliadis, Christian; Janiuk, Agnieszka; Janka, Thomas; Jerkstrand, Anders; Johns, Lucas; Jones, Samuel; Jose, Jordi; Kajino, Toshitaka; Karakas, Amanda; Karpov, Platon; Kasen, Dan; Kierans, Carolyn; Kippen, Marc; Korobkin, Oleg; Kobayashi, Chiaki; Kozma, Cecilia; Krot, Saha; Kumar, Pawan; Kuvvetli, Irfan; Laird, Alison; Laming, Martin; Larsson, Josefin; Lattanzio, John; Lattimer, James; Leising, Mark; Lennarz, Annika; Lentz, Eric; Limongi, Marco; Lippuner, Jonas; Livne, Eli; Lloyd-Ronning, Nicole; Longland, Richard; Lopez, Laura A.; Lugaro, Maria; Lutovinov, Alexander; Madsen, Kristin; Malone, Chris; Matteucci, Francesca; McEnery, Julie; Meisel, Zach; Messer, Bronson; Metzger, Brian; Meyer, Bradley; Meynet, Georges; Mezzacappa, Anthony; Miller, Jonah; Miller, Richard; Milne, Peter; Misch, Wendell; Mitchell, Lee; Mosta, Philipp; Motizuki, Yuko; Muller, Bernhard; Mumpower, Matthew; Murphy, Jeremiah; Nagataki, Shigehiro; Nakar, Ehud; Nomoto, Ken'ichi; Nugent, Peter; Nunes, Filomena; O'Shea, Brian; Oberlack, Uwe; Pain, Steven; Parker, Lucas; Perego, Albino; Pignatari, Marco; Pinedo, Gabriel Martinez; Plewa, Tomasz; Poznanski, Dovi; Priedhorsky, William; Pritychenko, Boris; Radice, David; Ramirez-Ruiz, Enrico; Rauscher, Thomas; Reddy, Sanjay; Rehm, Ernst; Reifarth, Rene; Richman, Debra; Ricker, Paul; Rijal, Nabin; Roberts, Luke; Ropke, Friedrich; Rosswog, Stephan; Ruiter, Ashley J.; Ruiz, Chris; Savin, Daniel Wolf; Schatz, Hendrik; Schneider, Dieter; Schwab, Josiah; Seitenzahl, Ivo; Shen, Ken; Siegert, Thomas; Sim, Stuart; Smith, David; Smith, Karl; Smith, Michael; Sollerman, Jesper; Sprouse, Trevor; Spyrou, Artemis; Starrfield, Sumner; Steiner, Andrew; Strong, Andrew W.; Sukhbold, Tuguldur; Suntzeff, Nick; Surman, Rebecca; Tanimori, Toru; The, Lih-Sin; Thielemann, Friedrich-Karl; Tolstov, Alexey; Tominaga, Nozomu; Tomsick, John; Townsley, Dean; Tsintari, Pelagia; Tsygankov, Sergey; Vartanyan, David; Venters, Tonia; Vestrand, Tom; Vink, Jacco; Waldman, Roni; Wang, Lifang; Wang, Xilu; Warren, MacKenzie; West, Christopher; Wheeler, J. Craig; Wiescher, Michael; Winkler, Christoph; Winter, Lisa; Wolf, Bill; Woolf, Richard; Woosley, Stan; Wu, Jin; Wrede, Chris; Yamada, Shoichi; Young, Patrick; Zegers, Remco; Zingale, Michael; Zwart, Simon Portegies (2019-03-31)
      Gamma-ray astronomy explores the most energetic photons in nature to address some of the most pressing puzzles in contemporary astrophysics. It encompasses a wide range of objects and phenomena: stars, supernovae, novae, ...

    • Charged-particle and neutron-capture processes in the high-entropy wind of core-collapse supernovae 

      Farouqi, K.; Kratz, K.L.; Pfeiffer, B.; Rauscher, T.; Thielemann, Friedrich-Karl; Truran, J. W. (2010-04-01)
      The astrophysical site of the r-process is still uncertain, and a full exploration of the systematics of this process in terms of its dependence on nuclear properties from stability to the neutron drip-line within realistic ...

    • 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 ...

    • Constraints on rotational mixing from surface evolution of light elements in massive stars 

      Frischknecht, U.; Hirschi, R.; Meynet, G.; Ekstroem, S.; Georgy, C.; Rauscher, T.; Winteler, C.; Thielemann, Friedrich-Karl (2010-11)
      Context. Light elements and nitrogen surface abundances together can constrain the mixing efficiencies in massive stars on the main sequence, because moderate mixing in the surface layers leads to depletion of light elements ...

    • 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 ...

    • Cross sections for proton-induced reactions on Pd isotopes at energies relevant for the gamma process 

      Dillmann, I.; Coquard, L.; Domingo-Pardo, C.; Kaeppeler, F.; Marganiec, J.; Uberseder, E.; Giesen, U.; Heiske, A.; Feinberg, G.; Hentschel, D.; Hilpp, S.; Leiste, H.; Rauscher, T.; Thielemann, Friedrich-Karl (2011-07-19)
      Proton-activation reactions on natural and enriched palladium samples were investigated via the activation technique in the energy range of E(p) = 2.75-9 MeV, close to the upper end of the respective Gamow window of the. ...

    • 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, ...

    • End point of the rp process on accreting neutron stars 

      Schatz, H.; Aprahamian, A.; Bildsten, L.; Cumming, A.; Ouellette, M.; Rauscher, T.; Thielemann, Friedrich-Karl; Wiescher, M. (2001-04-16)
      We calculate the rapid proton (rp) capture process of hydrogen burning on the surface of an accreting neutron star with an updated reaction network that extends up to Xe, far beyond previous work. In both steady-state ...

    • The endpoint of the rp-process on accreting neutron stars 

      Schatz, H.; Aprahamian, A.; Bildsten, L.; Cumming, A.; Ouellette, M.; Rauscher, T.; Thielemann, Friedrich-Karl; Wiescher, M. (2001-05-21)
      We find that the rp process in X-ray bursts and in steady state burning, for example in X-ray pulsars, ends in a SnSbTe cycle. We discuss the consequences for the neutron star crust composition an X-ray burst light curves.

    • Experimental (n,gamma) cross sections of the p-process nuclei Se-74 and Sr-84 

      Dillmann, I.; Heil, M.; Kappeler, F.; Rauscher, T.; Thielemann, Friedrich-Karl (2006-01)
      The nucleosynthesis of elements beyond iron is dominated by the s and r processes. However, a small amount of stable isotopes on the proton-rich side cannot be made by neutron capture and are thought to be produced by ...

    • Explosive H-burning, the rp-process, and X-ray bursts 

      Thielemann, Friedrich-Karl; Schatz, H.; Rauscher, T.; Rembges, J.F.; Gorres, J.; Wiescher, Michael; Bildsten, L. (IOP Publishing Ltd., 1998)
      The major astrophysical events which involve explosive H-burning are novae and type I X-ray bursts. Both are related to binary stellar systems with hydrogen accretion from a binary companion onto a compact object, and the ...

    • Explosive nucleosynthesis and the astrophysical r-process 

      Thielemann, Friedrich-Karl; Freiburghaus, C.; Rauscher, T.; Kolbe, E.; Pfeiffer, B.; Kratz, K.L.; Cowan, J.J. (American Institute of Physics (AIP), 1998)
      We give an overview of chemical equilibria in explosive burning and the role which neutron and/or proton separation energies play. We focus then on the rapid neutron-capture process (r-process) which encounters unstable ...

    • Explosive nucleosynthesis close to the drip lines 

      Thielemann, Friedrich-Karl; Freiburghaus, C.; Rauscher, T.; Rembges, F.; Rosswog, S.; Pfeiffer, B.; Kratz, K.L.; Schatz, H.; Wiescher, M. (1998-11)
      We give an overview of explosive burning and the role which neutron and/or proton separation energies play. We focus then on the rapid neutron capture process (r-process) which encounters unstable nuclei with neutron ...