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Mueller, W.F.J.
Heidelberg Univ. (Germany, F.R.). Naturwissenschaftliche Gesamtfakultaet1981
Heidelberg Univ. (Germany, F.R.). Naturwissenschaftliche Gesamtfakultaet1981
AbstractAbstract
[en] At the CERN-SC an experiment for the study of the reaction mechanism in heavy ion collision at incident velocities above the Fermi velocity was performed. Thereby targets of 181Ta, 197Au, and 238U were irradiated with 12C ions of 86 MeV/u and partly 58 MeV/u. The experimental setup should yield an at most comprehensive survey over the reaction channels. Large area counter systems for the detection of projectile and target fragments were developed. In coincidence for this small counters with good resolution and particle identification were operated. By the detection of the target fragments in a large spatial angle it could be shown that for the reaction 12C + 238U the binary fission is the dominant channel for the decay of the residual target nucleus. From the angular correlation of the fission fragments the momentum transfer to the target nucleus can be determined. By this a discrimination between peripheral and central collisions is possible. From the multiplicity and type of the projectile fragments furthermore can be concluded on the impact parameter. The multiplicity of the emitted light particles (p, α) under 450 and 1350 refers to the deposed energy. A strong dependence of the multiplicities and angular distributions on the momentum transfer to the target nucleus is observed. The mechanisms dominant for the different impact parameter regimes are discussed. The emission of medium heavy fragment (C..Ca) could be detected in coincidence with two fission fragments. A break up of the residual target nucleus in 4 or more fragments heavier than carbon was not found. (orig.)
[de]
Am CERN-SC wurde ein Experiment zur Untersuchung des Reaktionsmechanismus in Schwerionenstoessen bei Einschussgeschwindigkeiten oberhalb der Fermi-Geschwindigkeit durchgefuehrt. Dabei wurden Targets aus 181Ta, 197Au und 238U mit 12C-Ionen von 86 MeV/u und teilweise 58 MeV/u bestrahlt. Der experimentelle Aufbau sollte einen moeglichst umfassenden Ueberblick ueber die Reaktionskanaele geben. Es wurden grossflaechige Zaehlersysteme fuer den Nachweis von Projektil- und Targetfragmenten entwickelt. In Koinzidenz dazu wurden kleine Zaehler mit guter Aufloesung und Teilchenidentifikation betrieben. Durch den Nachweis der Targetfragmente in einem grossen Raumwinkel konnte gezeigt werden, dass fuer die Reaktion 12C + 238U die binaere Spaltung der dominante Kanal fuer den Zerfall des Targetrestkerns ist. Aus der Winkelkorrelation der Spaltfragmente kann der Impulsuebertrag auf den Targetkern bestimmt werden. Damit ist eine Unterscheidung zwischen peripheren und zentralen Stoessen moeglich. Aus der Multiplizitaet und Art der Projektilfragmente kann weiter auf den Stossparameter geschlossen werden. Die Multiplizitaet der emittierten leichten Teilchen (p, α) unter 450 und 1350 weist auf die deponierte Energie hin. Es wird eine starke Abhaengigkeit der Multiplizitaeten und Winkelverteilungen vom Impulsuebertrag auf den Targetkern beobachtet. Die fuer die verschiedenen Stossparameterbereiche dominanten Mechanismen werden diskutiert. Die Emission mittelschwerer Fragmente (C..Ca) konnte in Koinzidenz mit 2 Spaltfragmenten nachgewiesen werden. Ein Aufbruch des Targetrestkerns in 4 oder mehr Fragmente schwerer als Kohlenstoff wurde nicht gefunden. (orig.)Original Title
Untersuchung zentraler Stoesse zwischen hochenergetischen schweren Ionen
Primary Subject
Source
Oct 1981; 62 p; Diss. (D.Sc.).
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation; Numerical Data
Report Number
Country of publication
ALPHA PARTICLES, ANGULAR CORRELATION, ANGULAR DISTRIBUTION, BERYLLIUM ISOTOPES, BINARY FISSION, BORON ISOTOPES, CARBON 12 REACTIONS, CARBON ISOTOPES, DEEP INELASTIC HEAVY ION REACT, ENERGY LOSSES, ENERGY SPECTRA, EXPERIMENTAL DATA, GEV RANGE 01-10, GOLD 197 TARGET, HELIUM ISOTOPES, IMPACT PARAMETER, INCLUSIVE INTERACTIONS, LINEAR MOMENTUM TRANSFER, LITHIUM ISOTOPES, MASS SPECTRA, MEV RANGE 100-1000, MULTIPLICITY, NUCLEAR FRAGMENTS, PROTONS, SPONTANEOUS FISSION, TANTALUM 181 TARGET, URANIUM 238 TARGET
BARYONS, CATIONS, CHARGED PARTICLES, CORRELATIONS, DATA, DECAY, DISTRIBUTION, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, FISSION, GEV RANGE, HADRONS, HEAVY ION REACTIONS, HELIUM IONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, INFORMATION, INTERACTIONS, IONS, MEV RANGE, MOMENTUM TRANSFER, NUCLEAR DECAY, NUCLEAR REACTIONS, NUCLEONS, NUMERICAL DATA, PARTICLE INTERACTIONS, SPECTRA, TARGETS
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Rubehn, Th.; Mueller, W.F.J.; Trautmann, W.
Lawrence Berkeley National Lab., CA (United States). Funding organisation: US Department of Energy (United States)1996
Lawrence Berkeley National Lab., CA (United States). Funding organisation: US Department of Energy (United States)1996
AbstractAbstract
No abstract available
Primary Subject
Source
Physical Review C-Nuclear Physics; v. 56(2); 1 Nov 1996; [vp.]; AC03-76SF00098; Available from Lawrence Berkeley National Lab., CA (US); Journal Publication Date:Aug. 1997
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Miscellaneous
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Country of publication
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AbstractAbstract
[en] We report on new measurements of the breakup temperature determined from isotope ratios as well as from state population ratios for the decay of the spectator in Au+Au collisions at 600 and 1000 A MeV and compare them to results for the decay of the participant region at beam energies of 50-200 A MeV. Temperatures deduced from the new isotope thermometer TBeLi exhibit a pronounced rise with increasing excitation energy and are consistent with the previously studied THeLi. In contrast, temperatures determined from state population ratios show no dependence on excitation energy. An improved calorimetric determination of the excitation energy for the spectator shows a significant increase with increasing bombarding energy which is in contrast to the observed universality of the fragment production. (orig.)
Primary Subject
Secondary Subject
Source
Feldmeier, H.; Knoll, J.; Noerenberg, W.; Wambach, J.; Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany); 380 p; 1999; p. 200-209; Hirschegg '99: 27. international workshop on gross properties of nuclei and nuclear excitations - Multifragmentation; Hirschegg (Austria); 17-23 Jan 1999; Available from TIB Hannover; 26 refs.
Record Type
Miscellaneous
Literature Type
Conference
Country of publication
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Related RecordRelated Record
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AbstractAbstract
No abstract available
Original Title
Messung der Fusionsquerschnitte am System 16O+28Si
Primary Subject
Source
DPG spring meeting and advanced training meeting of the Fachausschuss Kernphysik, Sektion A: Nuclear physics; Heidelberg, Germany, F.R; 13 - 18 Mar 1978; AED-CONF--78-084-274; Short communication only.
Record Type
Journal Article
Literature Type
Conference
Journal
Verhandlungen der Deutschen Physikalischen Gesellschaft; (no. 4); p. 896
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AbstractAbstract
No abstract available
Primary Subject
Source
Spring meeting of the DPG, NNV, DFS and BNV-SBP; Ghent, Belgium; 26 - 30 Mar 1979; INKA-CONF--79-004-135; Short communication only.
Record Type
Journal Article
Literature Type
Conference
Journal
Verhandlungen der Deutschen Physikalischen Gesellschaft; (no. 3); p. 809
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AbstractAbstract
[en] Total fusion-evaporation cross sections for the systems 27Al + /sup 16,18/O and /sup nat/Si + /sup 16,18/O have been measured in the energy range 34 MeV < or = E/sub lab/ < or = 81 MeV by detecting the evaporation residues in a time-of-flight spectrometer. The fusion cross sections for all systems were found to saturate at 1150--1200 mb. Fusion barriers have been deduced with the parametrization of Glas and Mosel. The data have also been discussed in terms of the Bass model
Primary Subject
Record Type
Journal Article
Literature Type
Numerical Data
Journal
Physical Review. C, Nuclear Physics; ISSN 0556-2813; 
; v. 20(3); p. 1028-1036
; v. 20(3); p. 1028-1036
Country of publication
Reference NumberReference Number
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AbstractAbstract
[en] With the ALADiN forward spectrometer the fragmentation of gold nuclei at 600 MeV per nucleon after interaction with carbon, aluminum, copper and lead targets has been investigated. The results are compared to Quantum Molecular Dynamics calculations using soft and hard equations of state. (author)
Primary Subject
Source
Heavy ion collisions at intermediate and relativistic energies conference; Erice (Italy); 7-16 Sep 1992
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Journal Article
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Conference
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Glasgow, R.; Gobbi, A.; Hildenbrand, K.; Ho, H.; Kuehn, W.; Loehner, H.; Lynen, U.; Mueller, W.F.J.; Olmi, A.; Pelte, D.
Experiments at CERN in 19811981
Experiments at CERN in 19811981
AbstractAbstract
No abstract available
Primary Subject
Source
European Organization for Nuclear Research, Geneva (Switzerland); 207 p; Aug 1981; vp; Published in summary form only.
Record Type
Miscellaneous
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Country of publication
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Bienkowski, A.; Trzcinski, A.; Zwieglinski, B.; Mueller, W.F.J.
ALADIN Collaboration at GSI Darmstadt. Funding organisation: Scientific and Technological Cooperation Joint Project between Poland and Germany (International Organisation without Location)
Annual report 19971998
ALADIN Collaboration at GSI Darmstadt. Funding organisation: Scientific and Technological Cooperation Joint Project between Poland and Germany (International Organisation without Location)
Annual report 19971998
AbstractAbstract
No abstract available
Primary Subject
Source
Chmielewska, D.; Infeld, E.; Zupranski, P. (eds.); The Andrzej Soltan Institute for Nuclear Studies, Otwock-Swierk (Poland); 202 p; ISSN 1232-5309; ; 1998; p. 27; GRANT NO FKZ NO POL-196-96; 2 refs
; 1998; p. 27; GRANT NO FKZ NO POL-196-96; 2 refs
Record Type
Miscellaneous
Literature Type
Progress Report
Report Number
Country of publication
Reference NumberReference Number
Related RecordRelated Record
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Bienkowski, A.; Trzcinski, A.; Zwieglinski, B.; Lynen, U.; Mueller, W.F.J.
ALADIN Collaboration at GSI Darmstadt. Funding organisation: Scientific and Technological Cooperation Joint Project between Poland and Germany (International Organisation without Location)
Annual Report 19981999
ALADIN Collaboration at GSI Darmstadt. Funding organisation: Scientific and Technological Cooperation Joint Project between Poland and Germany (International Organisation without Location)
Annual Report 19981999
AbstractAbstract
No abstract available
Source
Chmielewska, D.; Infeld, E.; Preibisz, Z.; Zupranski, P. (eds.); The Andrzej Soltan Institute for Nuclear Studies, Otwock-Swierk (Poland); 185 p; ISSN 1232-5309; ; 1999; p. 22-23; GRANT NO FKZ NO POL-196-96; 2 refs, 2 figs
; 1999; p. 22-23; GRANT NO FKZ NO POL-196-96; 2 refs, 2 figs
Record Type
Miscellaneous
Literature Type
Progress Report
Report Number
Country of publication
Reference NumberReference Number
Related RecordRelated Record
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