Degree Type

Dissertation

Date of Award

1982

Degree Name

Doctor of Philosophy

Department

Physics and Astronomy

Abstract

Targets of ('12)C, ('59)Co, ('89)Y, ('197)Au and ('238)U were bombarded by 2.1 GeV/A ('1)H, ('12)C and ('20)Ne projectiles using the SuperHILAC and BEVATRON facilities at Lawrence Berkeley Laboratory (LBL). The beam flux was calculated by monitoring the decay of ('11)C produced from the ('12)C(projectile,projectile n)('11)C reaction. Residual gamma-ray activity from the Co, Y, Au and U targets was collected in order to trace the decay of several reaction products. The experiment focused on the calculation of cross sections for the formation of products with one neutron removed from the various target nuclei. Corrections to the saturation activity of each product were made for detector efficiency, gamma-ray absorption in the target, gamma-ray branching, beam geometry and secondary reactions;These data are shown to be inconsistent with a geometrical form given by;(sigma) (PROPORTIONAL) (A(,p)('1/3) + A(,t)('1/3) - b);where b is a universal constant. In fact the data indicates the b = A(,t)('1/3). Instead the data can be fit quite well by a simple empirical relation,;(sigma)(,emp) = 12.0 mb A(,p)('1/3) A(,t)('1/3);It is demonstrated that an empirical fit which varies as A(,t)('1/3) is^also consistent with projectile fragmentation data measured by a^group at LBL. In addition these data are compared to a theoretical^prediction which is the sum of a renormalized Glauber term and a^term which represents the contribution due to coulomb or^electromagnetic dissociation (ED). The theoretical predictions are^quite low for the ('12)C projectile data and high for the ('20)Ne projectile^data. The systematic trends from the comparison seem to indicate^that theoretical prediction for the ED contribution is rising too fast;as a function of projectile for a given target;('1)DOE Report IS-T-1012. This work was performed under ContractNo. W-7405-Eng-82 with the U.S. Department of Energy.

DOI

https://doi.org/10.31274/rtd-180813-5070

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Mark T. Mercier

Language

en

Proquest ID

AAI8224235

File Format

application/pdf

File Size

93 pages

Included in

Nuclear Commons

Share

COinS