SEARCH FOR MAGNETIC MONOPOLES IN THE LUNAR SAMPLES OF APOLLO11. Page: 2 of 13
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UCRL-19440
SEARCH FOR MAGNETIC MONOPOLES IN THE
LUNAR SAMPLES OF APOLLO 11*
Luis W. Alvarez, Philippe H. Eberhard, and
Ronald R. Ross
Lawrence Radiation Laboratory
University of California
Berkeley, California 94720
and
Robert D. Watt
Stanford Linear Accelerator Center
Stanford, California
December 1969
Abstract
An electromagnetic search for magnetic monopoles of
the minimum size predicted by Dirac, or of any larger mag-
nitude, has been performed on 8. 37 kilograms of lunar
surface material returned by the Apollo 11 crew. No
monopole was found. This experiment sets new limits
on the production cross section for monopoles, and on
their occurrence in cosmic radiation.
For several years now, the hunt has been on for particles that
would interact with the magnetic field, just as electric charges interact
with the electric field, acting as a source for the field and being accel-
erated by it. These particles, called monopoles, would be stable. They
would have a magnetic charge measured by an integer v, using the
Dirac charge z 3x10-8 emu as a unit (1). Their existence would give
credence to the only known explanation for the extraordinarily accurate-1-
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Alvarez, Luis W.; Eberhard, Philippe H.; Ross, Ronald R. & Watt,Robert D. SEARCH FOR MAGNETIC MONOPOLES IN THE LUNAR SAMPLES OF APOLLO11., article, December 1, 1969; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc899970/m1/2/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.