Files in this item



application/pdf1967_grike.pdf (7MB)Restricted to U of Illinois


Title:Study of the Bi209 (gamma,pi-xn) Po209-x and Pb206 (He3,xn) Po209-x reactions by detection of polonium alpha activities
Author(s):Grike, Leo Joseph
Doctoral Committee Chair(s):Yavin, A.I.
Department / Program:Physics
Subject(s):polonium alpha activities
complex nucleus
bremsstrahlung energies
CGLN cross sections
free neutrons
surface production models
volume production models
Abstract:The cross sections for Bi 209{gamma, pi-xn ) Po209-x were measured for x = 0-3, 5, and 7 and used to estimate the total (gamma, pi-) cross section. Total (gamma, pi-) cross sections have not previously been measured for a complex nucleus. At bremsstrahlung energies of 200,220, and 250 MeV, the total cross sections are 0.79 2.89 and 8.9 mb, respectively. These are 6.5, 24 and 65 times the CGLN cross sections for (gamma, pi-) on free neutrons. This result disagrees with both surface production and volume production models. At all energies, the cross section for x=2 dominates. This cannot be simply explained in terms of the free neutron cross sections. It is suggested that this experiment may be preferentially exciting isobaric analogs in Po209 of the lower excited states in Bi209.
Issue Date:1967
Genre:Dissertation / Thesis
Rights Information:1967 Leo Joseph Grike, Jr.
Date Available in IDEALS:2011-07-07
Identifier in Online Catalog:6094671

This item appears in the following Collection(s)

Item Statistics