Cummings, J. R. and Garrard, T. L. and Israel, M. H. and Klarmann, J. and Stone, E. C. and Waddington, C. J. and Binns, W. R.
(1990)
Global Representation of the Cross Sections for the Production of Fragments of UH Nuclei.
In:
Proceedings of the 21st International Cosmic Ray Conference.
Vol.3.
University of Adelaide
, Northfield, South Australia, pp. 417-419.
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Abstract
We have examined the fragmentation of relativistic iron, lanthanum, holmium and gold
nuclei with energies between 500 and 1200 MeV/n incident on targets of polyethylene, carbon,
aluminum, copper and lead. We have determined 1,256 elemental partial cross sections for the
production of fragments from interactions in pure target materials. Deduced values have been
found for another 417 cross sections in a hydrogen medium. The dependencies of these cross
sections on energy, mass and charge have been studied. We have generated a seven parameter
global fit to the cross sections for the heavy targets which fits a significant range of the data with
a standard deviation of 7%. We have also generated a similar global fit to the cross sections for
the hydrogen target which fits a slightly smaller range of the data with a standard deviation of
10%. These representations show that weak factorization can apply, but slightly better fits can
be obtained without it. The mean mass losses observed for fragments that have lost a few
protons, show that typically three or more neutrons are lost with each proton, producing
fragment nuclei that must be highly proton rich, and consequently very unstable
Item Type: | Book Section |
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Additional Information: | © Organizing Committee of the 21st Int. Cosmic Ray Conf. Provided by the NASA Astrophysics Data System.
We thank the staff at LBL, especially Hank Crawford, Jack Engelage,
Mel Flores and Fred Lothrop for their help. This work was partially supported by NASA
Grants NAG 8-498, -500, -502 and NGR 05-002-160, 24-005-050 and 26-008-001.
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Group: | Space Radiation Laboratory |
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Funders: | Funding Agency | Grant Number |
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NASA | NAG8-498 | NASA | NAG8-500 | NASA | NAG8-502 | NASA | NGR 05-002-160 | NASA | NGR 24-005-050 | NASA | NGR 26-008-001 |
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Other Numbering System: | Other Numbering System Name | Other Numbering System ID |
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Space Radiation Laboratory | 1989-08 |
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Record Number: | CaltechAUTHORS:20140507-142235633 |
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Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140507-142235633 |
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Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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ID Code: | 45586 |
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Collection: | CaltechAUTHORS |
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Deposited By: |
Joy Painter
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Deposited On: | 07 May 2014 21:38 |
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Last Modified: | 09 Mar 2020 13:18 |
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