Relativistic Heavy Ion Fragmentation at HISS. PDF Download
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Author: Craig Emerson Tull
Publisher:
ISBN:
Category :
Languages : en
Pages : 230
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Book Description
Author: Craig Emerson Tull
Publisher:
ISBN:
Category :
Languages : en
Pages : 230
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 112
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Book Description
An experiment was conducted at the Lawrence Berkeley Laboratory to measure projectile fragmentation of relativistic heavy ions. Charge identification was obtained by the use of a Cerenkov Hodoscope operating above the threshold for total internal reflection, while velocity measurement was performed by use of a second set of Cerenkov radiators operating at the threshold for total internal reflection. Charge and mass resolution for the system was [sigma]{sub Z} = 0.2 e and [sigma]{sub A} = 0.2 u. Measurements of the elemental and isotopic production cross sections for the fragmentation of 4°Ar at 1.65{center dot}A GeV have been compared with an Abrasion-Ablation Model based on the evaporation computer code GEMINI. The model proves to be an accurate predictor of the cross sections for fragments between Chlorine and Boron. The measured cross section were reproduced using simple geometry with charge dispersions induced by zero-point vibrations of the giant dipole resonance for the prompt abrasion stage, and injecting an excitation energy spectrum based on a final state interaction with scaling factor E{sub fsi} = 38.8 MeV/c. Measurement of the longitudinal momentum distribution widths for projectile fragments are consistent with previous experiment and can be interpreted as reflecting the Fermi momentum distribution in the initial projectile nucleus. Measurement of the transverse momentum indicate an additional, unexplained dependence of the reduced momentum widths on fragment mass. This dependence has the same sign and similar slope to previously measured fragments of 139La, and to predictions based on phase-space constraints on the final state of the system.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 56
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The Heavy Ion Spectrometer System (HISS) at the LBL Bevalac provided a unique facility for measuring projectile fragmentation cross sections important in deconvolving the Galactic Cosmic Ray (GCR) source composition. The general characteristics of the apparatus specific to this application are described and the main features of the event reconstruction and analysis used in the TRANSPORT experiment are discussed.
Author:
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ISBN:
Category :
Languages : en
Pages :
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Relativistic heavy ion collisions may be classified as central (and near central), peripheral, and grazing with each collision type producing different proton and other charged projectile fragment scattering mechanisms and characteristics. This report focuses on peripheral and grazing collisions in the fragmentation of Carbon-12 into Boron-11 and a proton, testing models of the kinetics involved in this reaction. The data were measured at the Heavy Ion Superconducting Spectrometer (HISS) at Lawrence Berkeley Laboratory and include excitation energy for the p/Boron-11 pair, and rapidity versus transverse momentum for protons and Boron-11. 58 refs., 35 figs., 8 tabs. (DWL).
Author: Michael Lawrence Webb
Publisher:
ISBN:
Category :
Languages : en
Pages : 238
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Book Description
Author: László P. Csernai
Publisher: World Scientific
ISBN: 9789810205379
Category : Heavy ion collisions
Languages : en
Pages : 398
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Author: Lawrence W. Townsend
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Author: William Bennett Christie
Publisher:
ISBN:
Category : Heavy ion collisions
Languages : en
Pages : 314
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Author: Ferdous Khan
Publisher:
ISBN:
Category :
Languages : en
Pages : 140
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Author: National Council on Radiation Protection and Measurements
Publisher:
ISBN:
Category : Astronauts
Languages : en
Pages : 452
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