R. Trockel

Publications (3)2.61 Total impact

• Article: Inclusive fragment production in84Kr +197Au atE/A=35 MeV

  U. Milkau, M. L. Begemann-Blaich, E. -M. Eckert, G. Imme, P. Kreutz, A. Kühmichel, M. Lattuada, U. Lynen, C. Mazur, W. F. J. Müller, J. B. Natowitz, C. Ngô, J. Pochodzalla, G. Raciti, M. Ribrag, H. Sann, W. Trautmann, R. Trockel
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  ABSTRACT: Inclusive cross sections of intermediate mass fragments from the reaction84Kr+197Au atE/A=35 MeV were measured over the range 8 lab70 with a low detection threshold. A moving-source parameterization was used to fit the double-differential cross sections. The integrated cross section for fragment production exceeds the total reaction cross section thus indicating a large probability for multi-fragment processes. The deduced large temperature parameters can be explained by assuming emission from a rotating source. From the comparison to reactions with12C and40Ar projectiles at E/A=30 MeV a systematics of inclusive fragment production as a function of the projectile mass is obtained.
  Zeitschrift für Physik A Hadrons and Nuclei 08/1993; 346(3):227-236.
• Article: Isotope yield ratios as a probe of the reaction dynamics

  W. Trautmann, K.D. Hildenbrand, U. Lynen, W.F.J. Müller, H.J. Rabe, H. Sann, H. Stelzer, R. Trockel, R. Wada, N. Brummund, R. Glasow, K.H. Kampert, R. Santo, E.M. Eckert, J. Pochodzalla, I. Bock, D. Pelte
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  ABSTRACT: Isotopically resolved yields of particles and complex fragments from 12C and 18O induced reactions on 58Ni, 64Ni, Ag and 197Au in the intermediate range of bombarding energies 30 MeV ≤ E/A ≤ 84 MeV were measured. The systematic variation of the deduced isotope yield ratios with projectile and target is used to determine the degree of N/Z equilibration achieved and to establish time scales for the reaction process. A quantum statistical model is employed in order to derive entropies of the emitting systems from the measured isotope yield ratios.
  Nuclear Physics A.
• Article: Do medium heavy fragments give evidence for a liquid gas phase transition?

  R. Trockel, K.D. Hildenbrand, U. Lynen, W.F.J. Müller, H. Rabe, H. Sann, H. Stelzer, R. Wada, N. Brummund, R. Glasow, K.-H. Kampert, R. Santo, D. Pelte, J. Pochodzalla, E. Agrell
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  ABSTRACT: An inclusive measurement of light and medium heavy fragments for eight projectile target combinations and incoming energies is presented. The energy spectra of all fragments are fitted consistently with a moving source parametrization. The results are compared to several model predictions. No evidence for the liquid gas phase transition of nuclear matter is found and considerable doubts in thermal interpretations arise. An alternative model of a cold shattering of the target nucleus is able to explain the energy spectra well but fails to reproduce the charge spectra.
  Progress in Particle and Nuclear Physics 15:225-237. · 2.61 Impact Factor