Hi ho silver! FSU physicist helps discover an atomic
oddity
January 30, 2006
Laptop Battery Working with an international team of scientists, a Florida
State University physics professor has taken part in an experiment
that resulted in the creation of a silver atom with exotic
properties never before observed. The team's observations represent
another step forward in science's long journey to understand the
nuclear reactions that power stars and produce all matter.
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Thinkpad Sam Tabor, a professor of experimental nuclear physics at FSU
and director of the university's Superconducting Accelerator
Laboratory, recently performed the experiment at the GSI laboratory
in Darmstadt, Germany, in collaboration with the international
team. In the experiment, a cigar-shaped atom was created using a
particle collider. To the scientists' surprise, this atom
demonstrated a novel kind of radioactive decay by spitting out two
free protons at the same time.
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Microsoft Radioactive decay normally involves the emission of one of three
types of particle: a helium nucleus consisting of two protons and
two neutrons, an electron or a photon. Exotic atoms engineered to
contain fewer neutrons than in the atom's natural state were
expected to break down by emitting protons one at a time. But the
correlated two-proton decay hadn't been seen before and represents
a new form of radioactivity.
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Laptop Computers The team's findings were published in the Jan. 19 issue of
Nature, the world's foremost scientific weekly journal.
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Laptop Computer "The purpose of this line of research is to expand our knowledge
of nuclear physics beyond those nuclei present in nature by
exploring nuclei with either fewer or more neutrons," Tabor said.
"This will help us to understand even the stable nuclei. Another
motivation is the fact that such unstable nuclei play important
roles in astrophysics and the production of the elements on Earth.
We cannot fully understand the astrophysical processes by which
even the atoms in our body were produced until we understand the
structure of neutron-rich and neutron-poor nuclei."
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Desktop Computer At the GSI lab, Tabor and his colleagues bombarded a thin film
of nickel foil with a beam of calcium atoms, causing some nickel
and calcium ions to coalesce to form silver atoms with fewer
neutrons than normal. Most of these silver atoms decayed
conventionally, but a few ejected two protons at once.
Notebooks The deficit of neutrons in the silver had deformed the nuclei
from spheres into fat cigar shapes. In some cases the proton pairs
jumped out from the same end of the cigar, at other times from
opposite ends, but they were always perfectly synchronized, Tabor
said.
Lenovo "It's like there's a captain on board telling them exactly when
to dive," he added.
Hard Drive In addition to Tabor, other members of the team were from
Germany, Belgium, Russia, Bulgaria, Poland, Italy and Spain.
Travelstar The collaborators now are discussing future directions for their
research. "However," Tabor said, "we are also performing related
research at the Superconducting Accelerator Laboratory right here
at FSU. Experiments currently under way here are exploring nuclei
with neutron excesses, and we have built a facility to directly
study reactions and nuclei of importance to astrophysics," Tabor
said.
Gateway Not all of Tabor's work is on such an elevated plane. At FSU he
also serves as coordinator of "The Flying Circus of Physics," an
open house and science fair hosted every other year by the physics
department to showcase some of the department's cutting-edge
research facilities.
Laptop Parts "'The Flying Circus of Physics' is a way to help generate
interest in the sciences, particularly among youngsters, by showing
folks that physics is fun," Tabor said.
Software Florida State University
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