Actions for Laser trapping of {sup 21}Na atoms [electronic resource].

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Laser trapping of {sup 21}Na atoms [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1994.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
152 pages : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
This thesis describes an experiment in which about four thousand radioactive ²¹Na (t{sub l/2} = 22 sec) atoms were trapped in a magneto-optical trap with laser beams. Trapped ²¹Na atoms can be used as a beta source in a precision measurement of the beta-asymmetry parameter of the decay of ²¹Na → ²¹Ne + Β⁺ + v{sub e}, which is a promising way to search for an anomalous right-handed current coupling in charged weak interactions. Although the number o trapped atoms that we have achieved is still about two orders of magnitude lower than what is needed to conduct a measurement of the beta-asymmetry parameter at 1% of precision level, the result of this experiment proved the feasibility of trapping short-lived radioactive atoms. In this experiment, ²¹Na atoms were produced by bombarding ²⁴Mg with protons of 25 MeV at the 88 in. Cyclotron of Lawrence Berkeley Laboratory. A few recently developed techniques of laser manipulation of neutral atoms were applied in this experiment. The ²¹Na atoms emerging from a heated oven were first transversely cooled. As a result, the on-axis atomic beam intensity was increased by a factor of 16. The atoms in the beam were then slowed down from thermal speed by applying Zeeman-tuned slowing technique, and subsequently loaded into a magneto-optical trap at the end of the slowing path. The last two chapters of this thesis present two studies on the magneto-optical trap of sodium atoms. In particular, the mechanisms of magneto-optical traps at various laser frequencies and the collisional loss mechanisms of these traps were examined.
Report Numbers
E 1.99:lbl--36120
lbl--36120
Subject(s)
Other Subject(s)
Dissertation Note
Thesis (Ph.D.); PBD: Sep 1994
Note
Published through SciTech Connect.
09/01/1994.
"lbl--36120"
"DE95002354"
Lu, Zheng-Tian.
Funding Information
AC03-76SF00098
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