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Determination of the Cross Sections for the Production of Fragments from Relativistic Nucleus-Nucleus Interactions. Part II: Parametric Fits

Cummings, J. R. and Binns, W. R. and Garrard, T. L. and Israel, M. H. and Klarmann, J. and Stone, E. C. and Waddington, C. J. (1990) Determination of the Cross Sections for the Production of Fragments from Relativistic Nucleus-Nucleus Interactions. Part II: Parametric Fits. Physical Review C, 42 (6). pp. 2530-2545. ISSN 0556-2813. http://resolver.caltech.edu/CaltechAUTHORS:20140501-111116037

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Abstract

Measurements of the partial charge-changing cross sections for the fragmentation of relativistic iron, lanthanum, holmium, and gold nuclei of several different energies incident on targets of polyethylene, carbon, aluminum, and copper have been reported in an accompanying paper. This paper describes the systematics of the variations of these cross sections with energy, projectile, target, and fragment. We have been able to generate a seven-parameter global fit to 795 measured cross sections for the heavy targets which fits the data with a standard deviation of 7%. We have also generated a similar global fit to 303 measured cross sections for a hydrogen target which fits the data with a standard deviation of 10%. These representations imply that the hypothesis of limiting fragmentation is only accurate to some 20–30 %. Weak factorization can apply, but fits that are marginally better, and more physically plausible, can be obtained without factorization. We have identified, and discussed, a number of caveats to the applicability of these fits outside, and inside, the range of energies and masses covered. Excessively large cross sections for the loss of a single proton from the projectile nuclei suggest electromagnetic dissociation. The cross sections for fragments that experience large charge changes appear to become independent of the size of the charge change. Very heavy projectiles have a significant probability of experiencing fission.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1103/PhysRevC.42.2530DOIArticle
http://journals.aps.org/prc/abstract/10.1103/PhysRevC.42.2530PublisherArticle
Contact Email Address:dmiles@caltech.edu
Additional Information:© 1990 The American Physical Society. Received 3 May 1990. This study was partially supported by NASA Grants NAG 8-498, -500, -502 and NGR 05-002-160, 24-005-050 and 26-008-001.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAG8-498
NASANAG8-500
NASANAG8-502
NASANGR 05-002-160
NASANGR 24-005-050
NASANGR 26-008-001
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1989-05
Record Number:CaltechAUTHORS:20140501-111116037
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140501-111116037
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45414
Collection:CaltechAUTHORS
Deposited By: SWORD User
Deposited On:01 May 2014 21:42
Last Modified:01 May 2014 21:42

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