Abstract
In the present thesis the production of neutral pions in the heavy-ion reactions {sup 20}Ne+{sup 27}Al at 350 MeV/u and {sup 40}Ar+{sup 40}Ca at 1 GeV/u is treated. In this thesis for both experiments the inclusive data are treated. In the case of the experiment Ar+Ca additionally the pion production dependent on the charged-particle multiplicity in the forward wall of the 4{pi} detector system is studied. From the measurements the total cross sections under assumption of a thermal pion source and from this derived the number of neutral pions per reaction result. By means of a geometrical model the production probability for neutral pions per participating nucleons can be calculated. The measured production probabilities fit well to a systematic representation of this quantity as function of the incident energy. By this a factorization of the total cross section results. The study of the pion multiplicity as function of the number of the charged particles and by this of the number of the participating nucleons results that the multiplicity of the neutral pions scales linearly with the number of the nucleons participating to the reaction and therefore the pions are produced in individual nucleon-nucleon collisions. As further measurement results the spectra
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Citation Formats
Pfeiffer, M.
Production of neutral pions in the heavy-ion reactions 350 MeV/u {sup 20}Ne + {sup 27}Al and 1 GeV/u {sup 40}Ar + {sup 40}Ca; Produktion neutraler Pionen in den Schwerionenreaktionen 350 MeV/u {sup 20}Ne + {sup 27}Al und 1 GeV/u {sup 40}Ar + {sup 40}Ca.
Germany: N. p.,
1993.
Web.
Pfeiffer, M.
Production of neutral pions in the heavy-ion reactions 350 MeV/u {sup 20}Ne + {sup 27}Al and 1 GeV/u {sup 40}Ar + {sup 40}Ca; Produktion neutraler Pionen in den Schwerionenreaktionen 350 MeV/u {sup 20}Ne + {sup 27}Al und 1 GeV/u {sup 40}Ar + {sup 40}Ca.
Germany.
Pfeiffer, M.
1993.
"Production of neutral pions in the heavy-ion reactions 350 MeV/u {sup 20}Ne + {sup 27}Al and 1 GeV/u {sup 40}Ar + {sup 40}Ca; Produktion neutraler Pionen in den Schwerionenreaktionen 350 MeV/u {sup 20}Ne + {sup 27}Al und 1 GeV/u {sup 40}Ar + {sup 40}Ca."
Germany.
@misc{etde_10121522,
title = {Production of neutral pions in the heavy-ion reactions 350 MeV/u {sup 20}Ne + {sup 27}Al and 1 GeV/u {sup 40}Ar + {sup 40}Ca; Produktion neutraler Pionen in den Schwerionenreaktionen 350 MeV/u {sup 20}Ne + {sup 27}Al und 1 GeV/u {sup 40}Ar + {sup 40}Ca}
author = {Pfeiffer, M}
abstractNote = {In the present thesis the production of neutral pions in the heavy-ion reactions {sup 20}Ne+{sup 27}Al at 350 MeV/u and {sup 40}Ar+{sup 40}Ca at 1 GeV/u is treated. In this thesis for both experiments the inclusive data are treated. In the case of the experiment Ar+Ca additionally the pion production dependent on the charged-particle multiplicity in the forward wall of the 4{pi} detector system is studied. From the measurements the total cross sections under assumption of a thermal pion source and from this derived the number of neutral pions per reaction result. By means of a geometrical model the production probability for neutral pions per participating nucleons can be calculated. The measured production probabilities fit well to a systematic representation of this quantity as function of the incident energy. By this a factorization of the total cross section results. The study of the pion multiplicity as function of the number of the charged particles and by this of the number of the participating nucleons results that the multiplicity of the neutral pions scales linearly with the number of the nucleons participating to the reaction and therefore the pions are produced in individual nucleon-nucleon collisions. As further measurement results the spectra of the kinematical quantities (energy, momentum, and rapidity) are studied. The shape of the spectra can be described by an isotropically emitting pion source in the nucleon-nucleon system with a thermal momentum distribution. Furthermore in all spectra without assumptions concerning the pion source the mean values can be determined.}
place = {Germany}
year = {1993}
month = {Oct}
}
title = {Production of neutral pions in the heavy-ion reactions 350 MeV/u {sup 20}Ne + {sup 27}Al and 1 GeV/u {sup 40}Ar + {sup 40}Ca; Produktion neutraler Pionen in den Schwerionenreaktionen 350 MeV/u {sup 20}Ne + {sup 27}Al und 1 GeV/u {sup 40}Ar + {sup 40}Ca}
author = {Pfeiffer, M}
abstractNote = {In the present thesis the production of neutral pions in the heavy-ion reactions {sup 20}Ne+{sup 27}Al at 350 MeV/u and {sup 40}Ar+{sup 40}Ca at 1 GeV/u is treated. In this thesis for both experiments the inclusive data are treated. In the case of the experiment Ar+Ca additionally the pion production dependent on the charged-particle multiplicity in the forward wall of the 4{pi} detector system is studied. From the measurements the total cross sections under assumption of a thermal pion source and from this derived the number of neutral pions per reaction result. By means of a geometrical model the production probability for neutral pions per participating nucleons can be calculated. The measured production probabilities fit well to a systematic representation of this quantity as function of the incident energy. By this a factorization of the total cross section results. The study of the pion multiplicity as function of the number of the charged particles and by this of the number of the participating nucleons results that the multiplicity of the neutral pions scales linearly with the number of the nucleons participating to the reaction and therefore the pions are produced in individual nucleon-nucleon collisions. As further measurement results the spectra of the kinematical quantities (energy, momentum, and rapidity) are studied. The shape of the spectra can be described by an isotropically emitting pion source in the nucleon-nucleon system with a thermal momentum distribution. Furthermore in all spectra without assumptions concerning the pion source the mean values can be determined.}
place = {Germany}
year = {1993}
month = {Oct}
}