A Caltech Library Service

The Stopping Power of Various Substances for Low Energy Protons


Bader, Michel (1955) The Stopping Power of Various Substances for Low Energy Protons. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/64N0-E240.


The stopping cross sections of several substances were measured for protons in the energy range 50 to 600 kev. The substances investigated were lithium, beryllium, copper, gold, lead, lithium fluoride and calcium fluoride. The energy loss in the substance under investigation was determined by measuring the incident proton beam energy necessary for a given outgoing energy before and after a thin evaporated layer of the substance had been placed in the path of the beam. The areal density of the layer was accurately determined by one of two methods: A chemical analysis or a micro-balance weighing of a known area of the evaporated deposit. The same layer was used in the energy loss as in the density determinations. These absolute measurements were made near 350 kev. Relative energy loss measurements were made over the remainder of the range, and normalized to them. The apparatus was so designed that the evaporations, weighings and energy loss determinations could be performed without removing the substance from the vacuum.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics and Mathematics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Minor Option:Mathematics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Whaling, Ward
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1955
Additional Information:Title varies in 1955 Caltech commencement program: The Stopping Cross Section of Various Substances for Low Energy Protons.
Record Number:CaltechETD:etd-11212003-113357
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4617
Deposited By: Imported from ETD-db
Deposited On:21 Nov 2003
Last Modified:28 Jun 2023 17:36

Thesis Files

PDF (Bader_m_1955.pdf) - Final Version
See Usage Policy.


Repository Staff Only: item control page