title: Copper activation deuterium-tritium neutron yield measurements at the National Ignition Facility.
abstract: A DT neutron yield diagnostic based on the reactions, (63)Cu(n,2n)(62)Cu(β(+)) and (65)Cu(n,2n)( 64) Cu(β(+)), has been fielded at the National Ignition Facility (NIF). The induced copper activity is measured using a NaI γ-γ coincidence system. Uncertainties in the 14-MeV DT yield measurements are on the order of 7% to 8%. In addition to measuring yield, the ratio of activities induced in two, well-separated copper samples are used to measure the relative anisotropy of the fuel ρR to uncertainties as low as 5%.
authors.affiliation: Chemical and Nuclear Engineering Department, University of New Mexico, Albuquerque, 87131, USA. gcoope@sandia.gov
authors.forename: G W
authors.initials: GW
authors.lastname: Cooper
authors.forename: C L
authors.initials: CL
authors.lastname: Ruiz
authors.forename: R J
authors.initials: RJ
authors.lastname: Leeper
authors.forename: G A
authors.initials: GA
authors.lastname: Chandler
authors.forename: K D
authors.initials: KD
authors.lastname: Hahn
authors.forename: A J
authors.initials: AJ
authors.lastname: Nelson
authors.forename: J A
authors.initials: JA
authors.lastname: Torres
authors.forename: R M
authors.initials: RM
authors.lastname: Smelser
authors.forename: B R
authors.initials: BR
authors.lastname: McWatters
authors.forename: D L
authors.initials: DL
authors.lastname: Bleuel
authors.forename: C B
authors.initials: CB
authors.lastname: Yeamans
authors.forename: K M
authors.initials: KM
authors.lastname: Knittel
authors.forename: D T
authors.initials: DT
authors.lastname: Casey
authors.forename: J A
authors.initials: JA
authors.lastname: Frenje
authors.forename: M
authors.initials: M
authors.lastname: Gatu Johnson
authors.forename: R D
authors.initials: RD
authors.lastname: Petrasso
authors.forename: J D
authors.initials: JD
authors.lastname: Styron