R. Brockmann
University of California, Berkeley
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Featured researches published by R. Brockmann.
Physics Letters B | 1985
John William Harris; R. Bock; R. Brockmann; A. Sandoval; R. Stock; H. Stroebele; G. Odyniec; H. G. Pugh; L.S. Schroeder; R.E. Renfordt; D. Schall; D. Bangert; W. Rauch; K. Wolf
Abstract It is shown that thermal and chemical equilibrium are approached during the high density stage in central nucleus-nucleus collisions and that the yield of produced pions is determined at that time. A chemical model with Rankine-Hugoniot compression is used to extract a nuclear matter equation of state from the observed pion yield assuming a partition of the internal energy per nucleon into thermal and compressional energy fractions, with only the former part contributing to particle production.
European Physical Journal A | 1990
J. Bartke; H. Bialkowska; R. Bock; R. Brockmann; S. I. Chase; I. Derado; V. Eckardt; J. Eschke; C. Favuzzi; D. Ferenc; B. Fleischmann; M. Fuchs; M. Gazdzicki; H.J. Gebauer; E. Gladysz; C. Guerra; O. Hansen; John William Harris; W. Heck; T. J. Humanic; K. Kadija; S. Kabana; A. Karabarbounis; K. Keidel; J. Kosiec; M. Kowalski; A. Kühmichel; M. Lahanas; J.Y. Lee; M. J. LeVine
AbstractThe production of Λ,
Physics Letters B | 1988
Andreas Bamberger; D. Bangert; J. Bartke; H. Bialkowska; R. Rock; R. Brockmann; S. I. Chase; C. DeMarzo; M. DePalma; I. Derado; V. Eckardt; C. Favuzzi; J. Fent; D. Ferenc; H. Fessler; P. Freund; M. Gazdzicki; H.J. Gebauer; K. Geissler; E. Gladysz; C. Guerra; John William Harris; W. Heck; T. J. Humanic; K. Kadija; A. Karabarbounis; R. Keidel; J. Kosiec; M. Kowalski; S. Margetis
Nuclear Physics | 1989
John William Harris; A. Bamberger; D. Bangert; J. Bartke; H. Bialkowska; R. Bock; R. Brockmann; S.I. Chase; C. De Marzo; M. De Palma; I. Derado; V. Eckardt; C. Favuzzi; J. Fendt; D. Ferenc; H. Fessier; P. Freund; M. Gazdzicki; H.J. Gebauer; K. Geissler; E. Gladysz; C. Guerra; J.W. Harris; W. Heck; T. J. Humanic; K. Kadija; A. Karabarbounis; R. Keidel; J. Kosiec; M. Kowalski
\bar \Lambda
European Physical Journal C | 1988
A. Bamberger; D. Bangert; J. Bartke; H. Bialkowska; R. Bock; R. Brockmann; S. I. Chase; C. De Marzo; M. De Palma; I. Derado; V. Eckardt; C. Favucci; J. Fent; D. Ferenc; P. Freund; M. Gazdzicki; H.J. Gebauer; K. Geissler; C. Guerra; John William Harris; W. Heck; T. J. Humanic; K. Kadija; A. Karabarbounis; R. Keidel; M. Kowalski; W. Krischer; M. Lahanas; S. Margetis; E. Nappi
Physics Letters B | 1988
A. Bamberger; D. Bangert; J. Bartke; H. Bialkowska; R. Bock; R. Brockmann; S. I. Chase; C. De Marzo; M. De Palma; I. Derado; V. Eckardt; C. Favuzzi; J. Fent; D. Ferenc; H. Fessler; P. Freund; M. Gazdzicki; H.J. Gebauer; K. Geissler; E. Gladysz; C. Guerra; John William Harris; W. Heck; T. J. Humanic; K. Kadija; A. Karabarbounis; R. Keidel; J. Kosiec; M. Kowalski; S. Margetis
andKs0 has been studied in 200 GeV/nucleonp+S and S+S collisions in the streamer chamber of the NA35 experiment at the CERN SPS. Significant enhancement of the multiplicities of all observed strange particles relative to negative hadrons was observed in central S+S collisions, as compared top+p andp+S collisions. The latter collisions show no overall (relative) strangeness enhancement overp+p, but the rapidity distributions and hadron multiplicities indicate some secondary cascading production of Λ particles in thep+S andp+Au collisions. The Λ polarization in central S+S collisions was found to be compatible with zero up topT=2 GeV/c.
European Physical Journal C | 1994
T. Alber; H. Appelshäuser; J. Bächler; J. Bartke; H. Bialkowska; M. A. Bloomer; R. Bock; W.J. Braithwaite; D. Brinkmann; R. Brockmann; P. Buncic; P. Chan; S.I. Chase; J. G. Cramer; P.B. Cramer; I. Derado; V. Eckardt; J. Eschke; C. Favuzzi; D. Ferenc; B. Fleischmann; P. Foka; M. Fuchs; M. Gaździcki; E. Gladysz; J. Gunther; John William Harris; M. Hoffmann; P. Jacobs; S. Kabana
Abstract We report results from a pion interferometry analysis of 200 GeV/nucleon 16 O+Au collisions. Both a gaussian source model and a model based on the inside-outside cascade are used to fit the experimental correlation function, giving transverse and longitudinal shape parameters, a freeze-out time parameter, and a chaoticity parameter for the pion emitting source. We find a transverse source size consistent with the projectile radius except at the CM rapidity, where significantly larger transverse and longitudinal sizes and a longer freeze-out time are measured suggesting a thermalized source. Calculation of correlation lengths, and comparisons with a simple freeze-out model and other pion interferometry experiments are presented.
European Physical Journal A | 1988
H. Ströbele; M. Tincknell; J. Seyerlein; R. Brockmann; A. Karabarbounis; A. Thomas; J. Pfennig; G. Paić; V. Eckardt; A. Panagiotou; C. De Marzo; D. Röhrich; D. Schall; M. Lahanas; T. J. Humanic; R. Renfordt; K. Geissler; M. Kowalski; K. Runge; N. Schmitz; J. Fendt; A. Bamberger; J. Bartke; P. Spinelli; F. Pühlhofer; J. W. Harris; K. Kadija; W. Heck; K. Pretzl; H.G. Pugh
Abstract Recent results from the NA35 Collaboration are presented for the reactions of 60 and 200 GeV/nucleon p and 16 O, and 200 GeV/nucleon 32 S with various targets ranging from S to Au. Midrapidity transverse energy distributions and forward energy flow, p⊥ spectra and rapidity distributions of hadrons are presented. Two-pion interferometry results are discussed. Neutral strange particle yields and p⊥ distributions are presented. Conclusions are drawn from the experimental results.
European Physical Journal A | 1988
Andreas Bamberger; D. Bangert; J. Bartke; H. Bialkowska; R. Bock; R. Brockmann; S. I. Chase; C. DeMarzo; M. DePalma; I. Derado; V. Eckardt; C. Favuzzi; J. Fent; D. Ferenc; H. Fessler; P. Freund; M. Gazdzicki; H.J. Gebauer; K. Geissler; E. Gladysz; C. Guerra; John William Harris; W. Heck; T. J. Humanic; K. Kadija; A. Karabarbounis; R. Keidel; J. Koisiec; M. Kowalski; S. Margetis
The results on spectra of negative particles produced in16O+Au andp-Au collisions at 200 GeV/nucleon and16O+Au at 60 GeV/nucleon are presented. The correlations of average rapidity and average transverse momentum with event multiplicity are studied. Spectral shapes are similar for central16O+Au andp-Au collisions. The transverse momentum and rapidity distributions for central16O+Au andp-Au collisions differ strongly from corresponding distributions forp+p interactions. The FRITIOF model fails to describe the shapes of the transverse momentum distributions. The simple thermodynamical model of a single fireball does not fit the midrapidity transverse momentum distributions, and the rapidity distributions.
Nuclear Physics | 1995
M. Gaździcki; T. Alber; H. Appelshäuser; J. Bächler; J. Bartke; H. Bialkowska; M. A. Bloomer; R. Bock; W.J. Braithwaite; D. Brinkmann; R. Brockmann; P. Buncic; P. Chan; J. G. Cramer; P.B. Cramer; I. Derado; V. Eckardt; J. Eschke; C. Favuzzi; D. Ferenc; B. Fleischmann; P. Foka; M. Fuchs; E. Gladysz; J. Gunther; John William Harris; M. Hoffmann; P. Jacobs; S. Kabana; K. Kadija
Abstract Inelastic cross sections at 60 and 200 GeV/nucleon are determined in a streamer chamber for 16 O on several nuclear targets. Charged particle multiplicity distributions for inelastic and central collisions are studied and compared with theoretical predictions. The inelastic cross section exhibit a geometrical dependence on nuclear radii. The multiplicity data are governed by the collision geometry. They are consistent with a picture of superposition of independent nucleon-nucleus interactions.
