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Title: Laser Trapping of {sup 225}Ra and {sup 226}Ra with Repumping by Room-Temperature Blackbody Radiation

Abstract

We have demonstrated Zeeman slowing and capture of neutral {sup 225}Ra and {sup 226}Ra atoms in a magneto-optical trap. The intercombination transition {sup 1}S{sub 0}{yields}{sup 3}P{sub 1} is the only quasicycling transition in radium and was used for laser-cooling and trapping. Repumping along the {sup 3}D{sub 1}{yields}{sup 1}P{sub 1} transition extended the lifetime of the trap from milliseconds to seconds. Room-temperature blackbody radiation was demonstrated to provide repumping from the metastable {sup 3}P{sub 0} level. We measured the isotope shift and hyperfine splittings on the {sup 3}D{sub 1}{yields}{sup 1}P{sub 1} transition with the laser-cooled atoms, and set a limit on the lifetime of the {sup 3}D{sub 1} level based on the measured blackbody repumping rate. Laser-cooled and trapped radium is an attractive system for studying fundamental symmetries.

Authors:
; ; ; ; ; ; ;  [1];  [1];  [2]
  1. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20957700
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevLett.98.093001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BLACKBODY RADIATION; CAPTURE; COOLING; LASERS; LIFETIME; MAGNETO-OPTICAL EFFECTS; RADIUM 225; RADIUM 226; SPECTRAL SHIFT; SYMMETRY; TEMPERATURE RANGE 0273-0400 K; TRAPPING; TRAPS; ZEEMAN EFFECT

Citation Formats

Guest, J. R., Scielzo, N. D., Ahmad, I., Bailey, K., Greene, J. P., Holt, R. J., O'Connor, T. P., Potterveld, D. H., Lu, Z.-T., and Department of Physics and the Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637. Laser Trapping of {sup 225}Ra and {sup 226}Ra with Repumping by Room-Temperature Blackbody Radiation. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.093001.
Guest, J. R., Scielzo, N. D., Ahmad, I., Bailey, K., Greene, J. P., Holt, R. J., O'Connor, T. P., Potterveld, D. H., Lu, Z.-T., & Department of Physics and the Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637. Laser Trapping of {sup 225}Ra and {sup 226}Ra with Repumping by Room-Temperature Blackbody Radiation. United States. doi:10.1103/PHYSREVLETT.98.093001.
Guest, J. R., Scielzo, N. D., Ahmad, I., Bailey, K., Greene, J. P., Holt, R. J., O'Connor, T. P., Potterveld, D. H., Lu, Z.-T., and Department of Physics and the Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637. Fri . "Laser Trapping of {sup 225}Ra and {sup 226}Ra with Repumping by Room-Temperature Blackbody Radiation". United States. doi:10.1103/PHYSREVLETT.98.093001.
@article{osti_20957700,
title = {Laser Trapping of {sup 225}Ra and {sup 226}Ra with Repumping by Room-Temperature Blackbody Radiation},
author = {Guest, J. R. and Scielzo, N. D. and Ahmad, I. and Bailey, K. and Greene, J. P. and Holt, R. J. and O'Connor, T. P. and Potterveld, D. H. and Lu, Z.-T. and Department of Physics and the Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637},
abstractNote = {We have demonstrated Zeeman slowing and capture of neutral {sup 225}Ra and {sup 226}Ra atoms in a magneto-optical trap. The intercombination transition {sup 1}S{sub 0}{yields}{sup 3}P{sub 1} is the only quasicycling transition in radium and was used for laser-cooling and trapping. Repumping along the {sup 3}D{sub 1}{yields}{sup 1}P{sub 1} transition extended the lifetime of the trap from milliseconds to seconds. Room-temperature blackbody radiation was demonstrated to provide repumping from the metastable {sup 3}P{sub 0} level. We measured the isotope shift and hyperfine splittings on the {sup 3}D{sub 1}{yields}{sup 1}P{sub 1} transition with the laser-cooled atoms, and set a limit on the lifetime of the {sup 3}D{sub 1} level based on the measured blackbody repumping rate. Laser-cooled and trapped radium is an attractive system for studying fundamental symmetries.},
doi = {10.1103/PHYSREVLETT.98.093001},
journal = {Physical Review Letters},
number = 9,
volume = 98,
place = {United States},
year = {Fri Mar 02 00:00:00 EST 2007},
month = {Fri Mar 02 00:00:00 EST 2007}
}
  • We have demonstrated Zeeman slowing and capture of neutral {sup 225}Ra and {sup 226}Ra atoms in a magneto-optical trap. The intercombination transition {sup 1}S{sub 0} {yields} {sup 3}P{sub 1} is the only quasicycling transition in radium and was used for laser-cooling and trapping. Repumping along the {sup 3}D{sub 1} {yields} {sup 1}P{sub 1} transition extended the lifetime of the trap from milliseconds to seconds. Room-temperature blackbody radiation was demonstrated to provide repumping from the metastable {sup 3}P{sub 0} level. We measured the isotope shift and hyperfine splittings on the {sup 3}D{sub 1} {yields} {sup 1}P{sub 1} transition with the laser-cooledmore » atoms, and set a limit on the lifetime of the {sup 3}D{sub 1} level based on the measured blackbody repumping rate. Laser-cooled and trapped radium is an attractive system for studying fundamental symmetries.« less
  • About 5 mg of Ra/sup 226/ were irradiated with 14.5 Mev neutrons. The products of the Ra/sup 226/(n,2n)Ra/sup 225/ and Ra/sup 226/(n,3n) Ra/sup 224/ reactions were determined by isolating Pb/sup 209/ and Bi/sup 212/ from their respective decay chains. Pb/sup 209/ was isolated by separating Bi/sup 213/ from the radium by means of an electrochemical deposition and then allowing Pb/sup 209/ to grow in from its decay chain. Pb/sup 209/ was then separated and its beta - particle activity was counted in a 4 pi proportional counter. Bi/sup 212/ was obtained by an electrochemical deposition following an electrolytic deposition ofmore » Pb/sup 212/. The alpha -particle activity of Bi/sup 212/ was counted in a gridded ionization chamber. The values found for the cross-sections are as follows- Ra/sup 226/ sigma (n,2n) = 1.60 plus or minus 0.20 barn; Ra/sup 226/ sigma (n,3n) = 0.53 plus or minus 0.07 barn. (auth)« less
  • A theory of the induction of osteosarcoma by ..cap alpha.. particles fits the data for radium in man and dog over the entire dose-time-response surface. The theory postulates that an endosteal cell near bone surface is transformed by three events. Two initiation events, each with a probability of 4 x 10/sup -8//rad (an effective target diameter of 100 A), are produced in a single cell by two ..cap alpha.. particles. A promotion event then occurs at a rate of 10/sup -2//year, not related to radiation, but proportional to the rate of bone remodeling. In competition with these events is themore » killing of any endosteal cell by an ..cap alpha.. particle with a probability of 10/sup -2//rad. Killed endosteal cells are assumed to be replaced by stem cells at a rate of 10/sup -1//day. Postulated tumor growth takes 3 to 6 years. These values for man are preliminary. The probability per rad per cell of each initiation appears to be approximately 10 times larger in dog than in man. A new method of three-dimensional analysis provides a compact way to report more fully the data for internal emitters and eliminates competing risks from comparisons between theory and experiment. The theory provides an explanation for latent period, for the protraction effect for /sup 224/Ra in man, for the scarcity of tumors in compact bone, for the narrow time distribution of tumors in dog, for the wide time distribution of tumors in man, for the plateau in cumulative incidence at 17 to 31 percent observed so far for /sup 226/Ra-/sup 228/Ra in man, for the much higher plateau in dog (92 percent), and for the steep decrease of tumor rate with decreasing dose below the plateau. Tumor rate P is shown to be a function of endosteal dose D, and, at less than 1 rad/day, to be independent of endosteal dose rate F. At low doses, P is proportional to D/sup 2/. At high doses, P plateaus and becomes independent of D. The onset of the plateau occurs at 140 rad and is governed by the mean lethal dose to endosteal cells.« less
  • Cited by 12