Browsing University of Hertfordshire by Author "Schatz, H."

Now showing items 1-16 of 16

    • An approximation for the rp-process 

      Rembges, F.; Freiburghaus, C.; Rauscher, T.; Thielemann, F.K.; Schatz, H.; Wiescher, M. (1997-07-20)
      Hot (explosive) hydrogen burning, or the rapid proton capture process (rp-process), occurs in a number of astrophysical environments. Novae and X-ray bursts are the most prominent ones, but accretion disks around black ...

    • 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 

      Schatz, H.; Aprahamian, A.; Brown, B.A.; Gorres, J.; Herndl, H.; Kratz, K.L.; Moller, P.; Pfeiffer, B.; Rauscher, T.; Rembges, J.F.; Thielemann, F.K.; Wiescher, M.; vanWormer, L. (1997-08-04)

    • 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.

    • 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 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 ...

    • Mass Measurements of Very Neutron-Deficient Mo and Tc Isotopes and Their Impact on rp Process Nucleosynthesis 

      Haettner, E.; Ackermann, D.; Audi, G.; Blaum, K.; Block, M.; Eliseev, S.; Fleckenstein, T.; Herfurth, F.; Hessberger, F. P.; Hofmann, S.; Ketelaer, J.; Ketter, J.; Kluge, H. -J.; Marx, G.; Mazzocco, M.; Novikov, Yu. N.; Plass, W. R.; Rahaman, S.; Rauscher, T.; Rodriguez, D.; Schatz, H.; Scheidenberger, C.; Schweikhard, L.; Sun, B.; Thirolf, P. G.; Vorobjev, G.; Wang, M.; Weber, C. (2011-03-21)
      The masses of ten proton-rich nuclides, including the N = Z + 1 nuclides (85)Mo and (87)Tc, were measured with the Penning trap mass spectrometer SHIPTRAP. Compared to the Atomic Mass Evaluation 2003 a systematic shift of ...

    • Models for Type I X-ray bursts with improved nuclear physics 

      Woosley, S.E.; Heger, A.; Cumming, A.; Hoffman, R. D.; Pruet, J.; Rauscher, T.; Fisker, J. L.; Schatz, H.; Brown, B.A.; Wiescher, M. (2004-03)
      Multizone models of Type I X-ray bursts are presented that use an adaptive nuclear reaction network of unprecedented size, up to 1300 isotopes, for energy generation and include the most recent measurements and estimates ...

    • Neutron captures and the r-process 

      Rauscher, T. (World Scientific Publishing, 2004)
      The r-process involves neutron-rich nuclei far off stability for which no experimental cross sections are known. Therefore, one has to rely on theory. The difficulties in the predictions are briefly addressed. To investigate ...

    • Nucleosynthesis at the proton drip line - a challenge for nuclear physics 

      Schatz, H.; Bildsten, L.; Gorres, J.; Rauscher, T.; Thielemann, Friedrich-Karl; Wiescher, Michael (American Institute of Physics, 1998)
      The rp-process in X-ray bursts is investigated using a complete and updated nuclear reaction network from H to Sr, that is coupled to a one dimensional, one zone X-ray burst model. In particular we consider 2p-capture ...

    • Proton capture cross sections of the ruthenium isotopes 

      Bork, J.; Schatz, H.; Kappeler, F.; Rauscher, T. (1998-07)
      The proton capture cross sections of the stable ruthenium isotopes 96, 98, 99, and 104 have been measured by means of the activation method in the proton energy range between 1.5 and 3 MeV. Thin layers of natural ruthenium ...

    • The r-process in supernovae 

      Thielemann, Friedrich-Karl; Argast, D.; Mocelj, D.; Rauscher, T.; Cowan, J.J.; Kratz, K.L.; Pfeiffer, B. (World Scientific Publishing, 2004-09)
      This introductory review aims at understanding r-process nucleosynthesis by addressing the issues involved, nuclear properties, necessary environment conditions, properties of different suggested r-process sites, observational ...

    • rp-process nucleosynthesis at extreme temperature and density conditions 

      Schatz, H.; Aprahamian, A.; Gorres, J.; Wiescher, M.; Rauscher, T.; Rembges, J.F.; Thielemann, F.K.; Pfeiffer, B.; Moller, P.; Kratz, K.L.; Herndl, H.; Brown, B.A.; Rebel, H. (1998-02)
      We present nuclear reaction network calculations to investigate the influence of nuclear structure on the rp-process between Ge and Sn in various scenarios. Due to the lack of experimental data for neutron-deficient nuclei ...

    • Technetium-97 and p-radionuclides 

      Dauphas, N.; Rauscher, T.; Schatz, H.; Marty, B.; Reisberg, L. (2002-08)

    • An updated library of reaction rates for the astrophysical rp-process. 

      Sakharuk, A.; Elliot, T.; Fisker, J. L.; Hemingray, S.; Kruizenga, A.; Rauscher, T.; Schatz, H.; Smith, K.; Thielemann, Friedrich-Karl; Wiescher, Michael (American Institute of Physics, 2006)
      We are developing an updated library with reaction rates important for the study of the astrophysical rp- process. It includes both experimental and theoretical rates parametrized in terms of the standard REACLIB format. ...