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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.

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