A technique for shell compression measurements of laser fusion targets by neutron activation of a rubidium tracer

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At the Nova Laser, the activation of a rubidium tracer incorporated in the shell of ICF targets has become a standard diagnostic technique for measuring the compressed shell areal density {l angle}{rho}{Delta}R{r angle}. The isotope {sup 85}Rb is activated by 14 MeV implosion neutrons to produce the isomer {sup 84m}Rb(t{sub {1/2}} = 20.5 min) which is used to determine the shell {l angle}{rho}{Delta}R{r angle} while the radioactive isotope {sup 86}Rb(t{sub 1/2} = 18.8 d) is used to determine the fraction of target debris collected as well as to assay the amount of rubidium in the target. The {sup 85}Rb(n,2n){sup 84m}Rb … continued below

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11 pages

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Lane, S.M. & Nelson, M.B. December 7, 1990.

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At the Nova Laser, the activation of a rubidium tracer incorporated in the shell of ICF targets has become a standard diagnostic technique for measuring the compressed shell areal density {l angle}{rho}{Delta}R{r angle}. The isotope {sup 85}Rb is activated by 14 MeV implosion neutrons to produce the isomer {sup 84m}Rb(t{sub {1/2}} = 20.5 min) which is used to determine the shell {l angle}{rho}{Delta}R{r angle} while the radioactive isotope {sup 86}Rb(t{sub 1/2} = 18.8 d) is used to determine the fraction of target debris collected as well as to assay the amount of rubidium in the target. The {sup 85}Rb(n,2n){sup 84m}Rb cross-section at 14.1 MeV was measured ({sigma} = 0.514 {plus minus} 0.080 b). Details of the detector system and experimental technique are given. 12 refs., 2 tabs.

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11 pages

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OSTI; NTIS; GPO Dep.

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  • 8. topical conference on high-temperature plasma diagnostics, Hyannis, MA (USA), 6-10 May 1990

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  • Other: DE91005265
  • Report No.: UCRL-JC-103884
  • Report No.: CONF-900557--33
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 6298743
  • Archival Resource Key: ark:/67531/metadc1104824

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  • December 7, 1990

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  • Feb. 22, 2018, 7:45 p.m.

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  • April 29, 2019, 12:58 p.m.

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Lane, S.M. & Nelson, M.B. A technique for shell compression measurements of laser fusion targets by neutron activation of a rubidium tracer, article, December 7, 1990; [Livermore,] California. (https://digital.library.unt.edu/ark:/67531/metadc1104824/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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