Latest documents http://publikationen.stub.uni-frankfurt.de/index/index/ Wed, 21 Sep 2005 19:16:34 +0200 Wed, 21 Sep 2005 19:16:34 +0200 http://publikationen.stub.uni-frankfurt.de/frontdoor/index/index/docId/3932 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. Reinhard Stock; R. Bock; R. Brockman; J. W. Harris; A. Sandoval; Herbert Ströbele; K. L. Wolf; H. G. Pugh; L. S. Schroeder; M. Maier; R. E. Renfordt; A. Dacal; M. E. Ortiz article http://publikationen.stub.uni-frankfurt.de/frontdoor/index/index/docId/3932 Wed, 21 Sep 2005 19:16:34 +0200 http://publikationen.stub.uni-frankfurt.de/frontdoor/index/index/docId/3933 The parities of eleven J=1 levels in 208Pb were determined by nuclear resonance fluorescence scattering of linearly polarized photons. A new 1+ level at Ex=5.846 MeV with Gamma 02 / Gamma =1.2±0.4 eV was found. This level can probably be identified with the theoretically predicted isoscalar 1+ state in 208Pb. All other bound dipole states below 7 MeV with Gamma 02 / Gamma >1.5 eV have negative parity. The 1- assignment to the 4.842-MeV level is of special significance because of previous conflicting results about its parity. K. Wienhard; K. Ackermann; K. Bangert; U. E. P. Berg; C. Bläsing; W. Naatz; A. Ruckelshausen; D. Rück; R. K. M. Schneider; Reinhard Stock article http://publikationen.stub.uni-frankfurt.de/frontdoor/index/index/docId/3933 Wed, 21 Sep 2005 18:47:58 +0200 http://publikationen.stub.uni-frankfurt.de/frontdoor/index/index/docId/3939 Spectra of positive pions with energies of 15-95 MeV were measured for high energy proton, 4He, 20Ne, and 40Ar bombardments of targets of 27Al, 40Ca, 107,109Ag, 197Au, and 238U. A Si-Ge telescope was used to identify charged pions by dE / dx-E and, in addition, stopped pi + were tagged by the subsequent muon decay. In all, results for 14 target-projectile combinations are presented to study the dependence of pion emission patterns on the bombarding energy (from E / A=0.25 to 2.1 GeV) and on the target and the projectile masses. In addition, associated charged-particle multiplicities were measured in an 80-paddle array of plastic scintillators, and used to make impact parameter selections on the pion-inclusive data. NUCLEAR REACTIONS U(20Ne, pi +), E / A=250 MeV; U(40Ar, pi +), Ca(40Ar, pi +), U(20Ne, pi +), Au(20Ne, pi +), Ag(20Ne, pi +), Al(20Ne, pi +), U(4He, pi +), Al(4He, pi +). E / A=400 MeV; Ca(40Ar, pi +), U(20Ne, pi +), U(4He, pi +), U(p, pi +), E / A=1.05), GeV; U(20Ne, pi +), E / A=2.1 GeV; measured sigma (E, theta ), inclusive and selected on associated charged-particle multiplicity. K. L. Wolf; H. H. Gutbrod; M. G. Meyer; A. M. Poskanzer; A. Sandoval; Reinhard Stock; J. Gosset; J.-C. Jourdain; C. H. King; G. King; Nguyen Van Sen; G. D. Westfall article http://publikationen.stub.uni-frankfurt.de/frontdoor/index/index/docId/3939 Tue, 20 Sep 2005 14:21:52 +0200