title: Radiochemical determination of Inertial Confinement Fusion capsule compression at the National Ignition Facility.
abstract: We describe a radiochemical measurement of the ratio of isotope concentrations produced in a gold hohlraum surrounding an Inertial Confinement Fusion capsule at the National Ignition Facility (NIF). We relate the ratio of the concentrations of (n,γ) and (n,2n) products in the gold hohlraum matrix to the down-scatter of neutrons in the compressed fuel and, consequently, to the fuel's areal density. The observed ratio of the concentrations of (198m+g)Au and (196g)Au is a performance signature of ablator areal density and the fuel assembly confinement time. We identify the measurement of nuclear cross sections of astrophysical importance as a potential application of the neutrons generated at the NIF.
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: D A
authors.initials: DA
authors.lastname: Shaughnessy
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: K J
authors.initials: KJ
authors.lastname: Moody
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: N
authors.initials: N
authors.lastname: Gharibyan
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: Grant
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Gostic
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: P C
authors.initials: PC
authors.lastname: Torretto
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: P T
authors.initials: PT
authors.lastname: Wooddy
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: B B
authors.initials: BB
authors.lastname: Bandong
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Despotopulos
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Cerjan
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Hagmann
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Caggiano
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: C B
authors.initials: CB
authors.lastname: Yeamans
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: L A
authors.initials: LA
authors.lastname: Bernstein
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: D H G
authors.initials: DH
authors.lastname: Schneider
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: E A
authors.initials: EA
authors.lastname: Henry
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Fortner