Observation of enhanced subthreshold K+ production in central collisions between heavy nuclei

  • In the very heavy collision system 197Au+197Au the K+ production process was studied as a function of impact parameter at 1 GeV/nucleon, a beam energy well below the free N-N threshold. The K+ multiplicity increases more than linearly with the number of participant nucleons and the K+/ pi + ratio rises significantly when going from peripheral to central collisions. The measured K+ double differential cross section is enhanced by a factor of 6 compared to microscopic transport calculations if secondary processes (Delta N-->K Lambda N and Delta Delta -->K Lambda N) are ignored.

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Author:Dariusz Czesław MiśkowiecORCiD, Wolfgang Ahner, Ralph Barth, Maciej Cieślak, Mariusz De̜bowski, Eckart Grosse, Walter Henning, Piotr Koczoń, Rainer SchickerGND, Erwin Schwab, Peter Senger, Peter Baltes, Christian Müntz, Helmut OeschlerGND, S. Sartorius, Christian Sturm, Andreas Wagner, Peter BeckerleGND, Christian BormannGND, Dieter R. Brill, Yang-Hwan Shin, Johannes Stein, Reinhard StockGND, Herbert Ströbele, Bernd Kohlmeyer, Horst Pöppl, Falk PühlhoferGND, Jürgen Speer, Konrad Völkel, Wladek Walús
Parent Title (English):Physical Review Letters
Document Type:Article
Date of Publication (online):2005/10/14
Year of first Publication:1994
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/10/14
Page Number:4
First Page:3650
Last Page:3653
Source:Phys. Rev. Lett. 72, 3650-3653 (1994), ©1994 The American Physical Society, http://link.aps.org/abstract/PRL/v72/p3650
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht