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Title: Nuclear polarization in gaseous /sup 3/He by optical pumping

Abstract

Optical pumping can provide significant nuclear polarizations in gaseous /sup 3/He. This method, developed by Colegrove, Schearer and Walters 20 years ago, can be applied to the realization of polarized targets for nuclear physics or neutron spin state filters. Moreover, highly polarized discharges in gaseous helium can be used as sources of polarized beams of atomic or molecular ions or electrons. Some progress has been made recently to obtain higher nuclear polarizations in gaseous /sup 3/He at a higher density. Laser optical pumping can produce polarizations over 60% or more in a gas at room temperature. This can be combined with a polarization transfer technique, in which a laser is used to pump /sup 3/He in a cell at room temperature, while another cell at a few degrees Kelvin is polarized by diffusion of the atoms through a long connecting tube. Cryogenic coatings, made of solid hydrogen frozen on the coldest parts of the inside wall of the container, reduce very effectively the fast nuclear relaxation which would occur on bare pyrex walls at low temperatures. Nuclear polarizations of the order of 50% have been obtained in a relatively dense gas (n approx. 10/sup 18/ cm/sup -3/) at T

Authors:
; ; ;  [1]
  1. Ecole Normale Superieure, 75 - Paris (France). Lab. de Spectroscopie Hertzienne
Publication Date:
OSTI Identifier:
5819799
Resource Type:
Journal Article
Journal Name:
Nucl. Sci. Appl.; (United States)
Additional Journal Information:
Journal Volume: 2:1
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; HELIUM 3; NUCLEAR ALIGNMENT; OPTICAL PUMPING; BIBLIOGRAPHIES; GASES; LASER RADIATION; POLARIZED BEAMS; POLARIZED TARGETS; REVIEWS; SPIN ORIENTATION; ULTRALOW TEMPERATURE; BEAMS; DOCUMENT TYPES; ELECTROMAGNETIC RADIATION; EVEN-ODD NUCLEI; FLUIDS; HELIUM ISOTOPES; ISOTOPES; LIGHT NUCLEI; NUCLEI; ORIENTATION; PUMPING; RADIATIONS; STABLE ISOTOPES; TARGETS; 651100* - Nuclear Physics- Experimental Techniques- (1980-)

Citation Formats

Leduc, M, Crampton, S B, Nacher, P J, and Laloee, F. Nuclear polarization in gaseous /sup 3/He by optical pumping. United States: N. p., 1984. Web.
Leduc, M, Crampton, S B, Nacher, P J, & Laloee, F. Nuclear polarization in gaseous /sup 3/He by optical pumping. United States.
Leduc, M, Crampton, S B, Nacher, P J, and Laloee, F. 1984. "Nuclear polarization in gaseous /sup 3/He by optical pumping". United States.
@article{osti_5819799,
title = {Nuclear polarization in gaseous /sup 3/He by optical pumping},
author = {Leduc, M and Crampton, S B and Nacher, P J and Laloee, F},
abstractNote = {Optical pumping can provide significant nuclear polarizations in gaseous /sup 3/He. This method, developed by Colegrove, Schearer and Walters 20 years ago, can be applied to the realization of polarized targets for nuclear physics or neutron spin state filters. Moreover, highly polarized discharges in gaseous helium can be used as sources of polarized beams of atomic or molecular ions or electrons. Some progress has been made recently to obtain higher nuclear polarizations in gaseous /sup 3/He at a higher density. Laser optical pumping can produce polarizations over 60% or more in a gas at room temperature. This can be combined with a polarization transfer technique, in which a laser is used to pump /sup 3/He in a cell at room temperature, while another cell at a few degrees Kelvin is polarized by diffusion of the atoms through a long connecting tube. Cryogenic coatings, made of solid hydrogen frozen on the coldest parts of the inside wall of the container, reduce very effectively the fast nuclear relaxation which would occur on bare pyrex walls at low temperatures. Nuclear polarizations of the order of 50% have been obtained in a relatively dense gas (n approx. 10/sup 18/ cm/sup -3/) at T},
doi = {},
url = {https://www.osti.gov/biblio/5819799}, journal = {Nucl. Sci. Appl.; (United States)},
number = ,
volume = 2:1,
place = {United States},
year = {Sat Dec 01 00:00:00 EST 1984},
month = {Sat Dec 01 00:00:00 EST 1984}
}