title: Search for x-ray induced acceleration of the decay of the 31-yr isomer of (178)Hf using synchrotron radiation.
abstract: Enhanced decay of the 31-yr isomer of (178)Hf induced by x-ray irradiation has been reported previously. Here we describe an attempt to reproduce this result with an intense "white" x-ray beam from the Advanced Photon Source. No induced decay was observed. The upper limits for the energy-integrated cross sections for such a process, over the range of energies of 20--60 keV x rays, are less than 2 x 10(-27) cm(2) keV, below the previously reported values by more than 5 orders of magnitude; at 8 keV the limit is 5 x 10(-26) cm(2) keV.
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: I
authors.initials: I
authors.lastname: Ahmad
authors.forename: J C
authors.initials: JC
authors.lastname: Banar
authors.forename: J A
authors.initials: JA
authors.lastname: Becker
authors.forename: D S
authors.initials: DS
authors.lastname: Gemmell
authors.forename: A
authors.initials: A
authors.lastname: Kraemer
authors.forename: A
authors.initials: A
authors.lastname: Mashayekhi
authors.forename: D P
authors.initials: DP
authors.lastname: McNabb
authors.forename: G G
authors.initials: GG
authors.lastname: Miller
authors.forename: E F
authors.initials: EF
authors.lastname: Moore
authors.forename: L N
authors.initials: LN
authors.lastname: Pangault
authors.forename: R S
authors.initials: RS
authors.lastname: Rundberg
authors.forename: J P
authors.initials: JP
authors.lastname: Schiffer
authors.forename: S D
authors.initials: SD
authors.lastname: Shastri
authors.forename: T F
authors.initials: TF
authors.lastname: Wang
authors.forename: J B
authors.initials: JB
authors.lastname: Wilhelmy