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Stock, Reinhard ; Bock, Rudolf ; Brockman, R. ; Harris, John W. ; Sandoval, Andres ; Ströbele, Herbert ; Wolf, Kevin L. ; Pugh, Howel G. ; Schroeder, Lee S. ; Maier, M. ; Renfordt, Rainer Arno Ernst ; Dacal, Ángel ; Ortiz, Maria Esther
The negative-pion multiplicity is measured for central collisions of 40Ar with KCl at eight energies from 0.36 to 1.8 GeV/nucleon and for 4He on KCl and 40Ar on BaI2 at 977 and 772 MeV/nucleon, respectively. A systematic discrepancy with a cascade-model calculation which fits proton- and pion-nucleus cross sections but omits potential-energy effects is used to derive the energy going into bulk compression of the system. A value of the incompressibility constant of K=240 MeV is extracted in a parabolic form of the nuclear-matter equation of state.
Sandoval, Andres ; Stock, Reinhard ; Stelzer, Herbert ; Renfordt, Rainer Arno Ernst ; Harris, John W. ; Brannigan, James P. ; Geaga, Jorge V. ; Rosenberg, L. J. ; Schroeder, Lee S. ; Wolf, Kevin L.
Exclusive pi - and charged-particle production in collisions of Ar+KCl is studied at incident energies from 0.4 to 1.8 GeV/u. Complete disintegration of both nuclei is observed. The correlation between pi - and total charge multiplicity shows no islands of anomalous pion production. For constant numbers of proton participants the pi - multiplicity distributions are Poissons. For central collisions <n pi -> increases smoothly and to first order linearly with the c.m. energy. Disagreement with the firestreak model is found. Pacs numbers: 25.70.Hi, 24.10.Dp
Harris, John W. ; Sandoval, Andres ; Stock, Reinhard ; Ströbele, Herbert ; Renfordt, Rainer Arno Ernst ; Geaga, Jorge V. ; Pugh, Howel G. ; Schroeder, S ; Wolf, Kevin L. ; Dacal, Ángel
Lambda 's produced in central collisions of 40Ar+KC1 at 1.8-GeV/u incident energy were detected in a streamer chamber by their charged-particle decay. For central collisions with impact parameters b<2.4 fm the Lambda production cross section is 7.6±2.2 mb. A calculation in which Lambda production occurs in the early stage of the collision qualitatively reproduces the results but underestimates the transverse momenta. An average Lambda polarization of -0.10±0.05 is observed. PACS numbers: 25.70 Bc