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Development of a fragment detector system for the study of peripheral collisions at high beam energies; Entwicklung eines Fragmentdetektorsystems zur Untersuchung peripherer Stoesse bei hohen Strahlenergien

Abstract

In the framework of the experimental program at the accelerator facilities SIS/ESR of the Society for Heavy-Ion research in Darmstadt one of the essential research aims of the LAND collaboration is the study of high-lying collective states after electromagnetic excitation in heavy-ion collisions at nearly relativistic beam energies. By the exchange of virtual photons with high energy giant resonances are excited with high probabilities. The main decay channel of giant resonances in heavy nuclei is the emission of neutrons as well as below the particle threshold the emission of {gamma} radiation. For the study of these states a detector system was developed, which makes the kinematically complete measurement of all reaction partners possible. For the determination of the neutron energy serves the Large Area Neutron Detector LAND, a time-of-flight spectrometer for high-energetic neutrons. For the measurement of the {gamma} radiation emitted by the excited projectile the target is surrounded by an array of 48 BaF{sub 2} crystals. A radiation detector system consisting of 6 single detectors and further 5 help detectors allows together with the magnetic spectrometer ALADIN the identification of the heavy projectile fragments by charge, momentum, and mass. Four position-sensitive plastic scintillators serve for the measurement of the  More>>
Authors:
Publication Date:
Jun 01, 1992
Product Type:
Thesis/Dissertation
Report Number:
GSI-92-12
Reference Number:
SCA: 440103; 663450; 663520; PA: DEN-92:016356; SN: 93000906086
Resource Relation:
Other Information: TH: Diss. (Dr.rer.nat.); PBD: Jun 1992
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; SIS SYNCHROTRON; HODOSCOPES; HEAVY ION REACTIONS; XENON 136 REACTIONS; INCLUSIVE INTERACTIONS; CARBON 12 TARGET; RELATIVISTIC RANGE; NEUTRONS; PHOTONS; GAMMA DECAY; E1-TRANSITIONS; E2-TRANSITIONS; GIANT RESONANCE; NEUTRON EMISSION; NUCLEAR FRAGMENTS; ESR STORAGE RING; MAGNETIC SPECTROMETERS; ION SPECTROSCOPY; MASS SPECTROSCOPY; ION DETECTION; GAMMA DETECTION; NEUTRON DETECTION; PARTICLE TRACKS; CHERENKOV COUNTERS; IONIZATION CHAMBERS; POSITION SENSITIVE DETECTORS; PLASTIC SCINTILLATION DETECTORS; PARTICLE IDENTIFICATION; GAMMA RADIATION; ROTATIONAL STATES; DE-EXCITATION; COLLECTIVE EXCITATIONS; NEUTRON SPECTROMETERS; TIME-OF-FLIGHT SPECTRO...; 440103; 663450; 663520; NUCLEAR SPECTROSCOPIC INSTRUMENTATION; HEAVY-ION-INDUCED REACTIONS AND SCATTERING; A = 6-19
OSTI ID:
10106183
Research Organizations:
Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany); Frankfurt Univ. (Germany). Fachbereich 13 - Physik
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Other: ON: DE93744613; TRN: DE9216356
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
129 p.
Announcement Date:
Jun 30, 2005

Citation Formats

Spies, H. Development of a fragment detector system for the study of peripheral collisions at high beam energies; Entwicklung eines Fragmentdetektorsystems zur Untersuchung peripherer Stoesse bei hohen Strahlenergien. Germany: N. p., 1992. Web.
Spies, H. Development of a fragment detector system for the study of peripheral collisions at high beam energies; Entwicklung eines Fragmentdetektorsystems zur Untersuchung peripherer Stoesse bei hohen Strahlenergien. Germany.
Spies, H. 1992. "Development of a fragment detector system for the study of peripheral collisions at high beam energies; Entwicklung eines Fragmentdetektorsystems zur Untersuchung peripherer Stoesse bei hohen Strahlenergien." Germany.
@misc{etde_10106183,
title = {Development of a fragment detector system for the study of peripheral collisions at high beam energies; Entwicklung eines Fragmentdetektorsystems zur Untersuchung peripherer Stoesse bei hohen Strahlenergien}
author = {Spies, H}
abstractNote = {In the framework of the experimental program at the accelerator facilities SIS/ESR of the Society for Heavy-Ion research in Darmstadt one of the essential research aims of the LAND collaboration is the study of high-lying collective states after electromagnetic excitation in heavy-ion collisions at nearly relativistic beam energies. By the exchange of virtual photons with high energy giant resonances are excited with high probabilities. The main decay channel of giant resonances in heavy nuclei is the emission of neutrons as well as below the particle threshold the emission of {gamma} radiation. For the study of these states a detector system was developed, which makes the kinematically complete measurement of all reaction partners possible. For the determination of the neutron energy serves the Large Area Neutron Detector LAND, a time-of-flight spectrometer for high-energetic neutrons. For the measurement of the {gamma} radiation emitted by the excited projectile the target is surrounded by an array of 48 BaF{sub 2} crystals. A radiation detector system consisting of 6 single detectors and further 5 help detectors allows together with the magnetic spectrometer ALADIN the identification of the heavy projectile fragments by charge, momentum, and mass. Four position-sensitive plastic scintillators serve for the measurement of the trajectory of the projectile respectively the projectile fragments in front and behind the deviating magnet. Additionally with these detectors the velocity is measured. For the determination of the nuclear charge of the projectile fragments serve a multiple-ionization chamber and a Cherenkov detector. In this thesis the development and taking into operation of the LAND radiation detector system is described. (orig./HSI). [Deutsch] Im Rahmen des experimentellen Programms an den Beschleunigeranlagen SIS/ESR der Gesellschaft fuer Schwerionenforschung in Darmstadt ist eines der wesentlichen Forschungsziele der LAND-Kollaboration die Untersuchung hochliegender kollektiver Zustaende nach elektromagnetischer Anregung in Schwerionenstoessen bei nahezu relativistischen Strahlenergien. Durch den Austausch virtueller Photonen mit hoher Energie werden Riesenresonanzen, mit hohen Wahrscheinlichkeiten angeregt. Hauptzerfallskanal von Riesenresonanzen in schweren Kernen ist die Emission von Neutronen sowie unterhalb der Teilchenschwelle die Emission von {gamma}-Strahlung. Zur Untersuchung dieser Zustaende wurde ein Detektorsystem entwickelt, das die kinematisch vollstaendige Messung aller beteiligten Reaktionspartner ermoeglicht. Zur Bestimmung der Neutronenenergien dient der Large Area Neutron Detektor LAND, ein Flugzeugspektrometer fuer hochenergetische Neutronen. Zur Messung der vom angeregten Projektil emittierten {gamma}-Strahlung ist das Target umgeben von einem Array aus 48 BAF{sub 2} Kristallen. Ein aus 6 Einzeldetektoren und weiteren 5 Hilfsdetektoren bestehendes Strahldetektorsystem erlaubt zusammen mit dem Magnetspektrometer ALADIN die Identifikation der schweren Projektilfragmente nach Ladung, Impuls und Masse. Vier ortsempfindliche Plastikszintillatoren dienen zur Vermessung der Trajektorie des Projektils bzw. der Projektilfragmente vor und hinter dem Ablenkmagneten. Zusaetzlich wird mit diesen Detektoren die Geschwindigkeit gemessen. Zur Bestimmung der Kernladung der Projektilfragmente dienen eine Mehrfach-Ionisationskammer und ein Cerenkovdetektor. In dieser Arbeit wird die Entwicklung und Inbetriebnahme des Land-Strahldetektorsystems beschrieben. (orig./HSI).}
place = {Germany}
year = {1992}
month = {Jun}
}