Search for superradiant emission states in nuclear isomer crystals

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This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The objective was to verify the stimulated emission of gamma rays from {sup 125m}Te, as claimed by Russian scientists. The reported cross section for stimulated emission was sufficiently large to allow gain in a single-pass gamma-ray laser. The stimulated emission of gamma rays from a nuclear isomer is expected to result in collinear photons and, therefore, should be observable as a sum peak in the gamma-ray spectrum. Skorobogatov and Dzevitskii reported an increase of an order of magnitude in ... continued below

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17 p.

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Rundberg, R.S.; Wilhelmy, J.B.; Taylor, R.D.; Solem, J.C.; Fowler, M.M.; Miller, G.G. et al. January 1, 1998.

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Description

This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The objective was to verify the stimulated emission of gamma rays from {sup 125m}Te, as claimed by Russian scientists. The reported cross section for stimulated emission was sufficiently large to allow gain in a single-pass gamma-ray laser. The stimulated emission of gamma rays from a nuclear isomer is expected to result in collinear photons and, therefore, should be observable as a sum peak in the gamma-ray spectrum. Skorobogatov and Dzevitskii reported an increase of an order of magnitude in the sum peak (218.56 keV) when a sample of beryllium telluride containing {sup 125m}Te was cooled from room temperature to near-liquid-helium temperatures. The authors have repeated their experiment and have observed no increase in the sum peak above accidental summing. The upper limit for the stimulated-emission cross section based on the three-standard-deviation statistical error is 6.8 x 10 {sup {minus}21} cm{sup 2}. This result is one order of magnitude lower than the cross section reported by Skorobogatov and Dzevitskii. The cross section would not allow gain in a single-pass gamma-ray laser. Their results support the position of Baldwin and Solem rather than that of Kamenov.

Physical Description

17 p.

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OSTI as DE00758828

Medium: P; Size: 17 pages

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  • Other Information: PBD: 1 Jan 1998

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  • Report No.: LA-UR-98-3639
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/758828 | External Link
  • Office of Scientific & Technical Information Report Number: 758828
  • Archival Resource Key: ark:/67531/metadc707236

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 7, 2017, 3:46 p.m.

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Rundberg, R.S.; Wilhelmy, J.B.; Taylor, R.D.; Solem, J.C.; Fowler, M.M.; Miller, G.G. et al. Search for superradiant emission states in nuclear isomer crystals, report, January 1, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc707236/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.