title: Reinvestigation of the direct two-proton decay of the long-lived isomer 94Ag(m) [0.4 s, 6.7 MeV, (21+)].
abstract: An attempt to confirm the reported direct one-proton and two-proton decays of the (21+) isomer at 6.7(5) MeV in 94Ag has been made. The 0.39(4) s half-life of the isomer permitted use of a helium-jet system to transport reaction products from the 40Ca + (nat)Ni reaction at 197 MeV to a low-background area; 24 gas DeltaE-(Si)E detector telescopes were used to identify emitted protons down to 0.4 MeV. No evidence was obtained for two-proton radioactivity with a summed energy of 1.9(1) MeV and a branching ratio of 0.5(3)%. Two groups of one-proton radioactivity from this isomer had also been reported; our data confirm the lower energy group at 0.79(3) MeV with its branching ratio of 1.9(5)%.
authors.affiliation: Department of Chemistry, University of California, Berkeley, California 94720, USA.
authors.forename: J
authors.initials: J
authors.lastname: Cerny
authors.forename: D M
authors.initials: DM
authors.lastname: Moltz
authors.forename: D W
authors.initials: DW
authors.lastname: Lee
authors.forename: K
authors.initials: K
authors.lastname: Peräjärvi
authors.forename: B R
authors.initials: BR
authors.lastname: Barquest
authors.forename: L E
authors.initials: LE
authors.lastname: Grossman
authors.forename: W
authors.initials: W
authors.lastname: Jeong
authors.forename: C C
authors.initials: CC
authors.lastname: Jewett