University of Illinois Urbana-Champaign

Study of the Bi209 (gamma,pi-xn) Po209-x and Pb206 (He3,xn) Po209-x reactions by detection of polonium alpha activities

Grike, Leo Joseph

This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.

Permalink

https://hdl.handle.net/2142/25686

Description

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
Issue Date
1967
Doctoral Committee Chair(s)
Yavin, A.I.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • polonium alpha activities
  • complex nucleus
  • bremsstrahlung energies
  • CGLN cross sections
  • free neutrons
  • surface production models
  • volume production models
Language
en
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.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/25686
Copyright and License Information
1967 Leo Joseph Grike, Jr.

Owning Collections

Dissertations and Theses - Physics
Dissertations in Physics
Graduate Dissertations and Theses at Illinois PRIMARY
Graduate Theses and Dissertations at Illinois