title: Observation of large scissors resonance strength in actinides.
abstract: The orbital M1 scissors resonance has been measured for the first time in the quasicontinuum of actinides. Particle-γ coincidences are recorded with deuteron and (3)He-induced reactions on (232)Th. The residual nuclei (231,232,233)Th and (232,233) Pa show an unexpectedly strong integrated strength of B(M1)=11-15μ(n)(2) in the E(γ)=1.0-3.5 MeV region. The increased γ-decay probability in actinides due to scissors resonance is important for cross-section calculations for future fuel cycles of fast nuclear reactors and may also have an impact on stellar nucleosynthesis.
authors.affiliation: Department of Physics, University of Oslo, N-0316 Oslo, Norway. magne.guttormsen@fys.uio.no
authors.forename: M
authors.initials: M
authors.lastname: Guttormsen
authors.forename: L A
authors.initials: LA
authors.lastname: Bernstein
authors.forename: A
authors.initials: A
authors.lastname: Bürger
authors.forename: A
authors.initials: A
authors.lastname: Görgen
authors.forename: F
authors.initials: F
authors.lastname: Gunsing
authors.forename: T W
authors.initials: TW
authors.lastname: Hagen
authors.forename: A C
authors.initials: AC
authors.lastname: Larsen
authors.forename: T
authors.initials: T
authors.lastname: Renstrøm
authors.forename: S
authors.initials: S
authors.lastname: Siem
authors.forename: M
authors.initials: M
authors.lastname: Wiedeking
authors.forename: J N
authors.initials: JN
authors.lastname: Wilson