title: Direct observation of long-lived isomers in 212Bi.
abstract: Long-lived isomers in (212)Bi have been studied following (238)U projectile fragmentation at 670 MeV per nucleon. The fragmentation products were injected as highly charged ions into a storage ring, giving access to masses and half-lives. While the excitation energy of the first isomer of (212)Bi was confirmed, the second isomer was observed at 1478(30) keV, in contrast to the previously accepted value of >1910 keV. It was also found to have an extended Lorentz-corrected in-ring half-life >30 min, compared to 7.0(3) min for the neutral atom. Both the energy and half-life differences can be understood as being due a substantial, though previously unrecognized, internal decay branch for neutral atoms. Earlier shell-model calculations are now found to give good agreement with the isomer excitation energy. Furthermore, these and new calculations predict the existence of states at slightly higher energy that could facilitate isomer deexcitation studies.
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany and II Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany and Cyclotron Institute, Texas A & M University, Texas 77843, USA.
authors.forename: L
authors.initials: L
authors.lastname: Chen
authors.affiliation: Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.
authors.forename: P M
authors.initials: PM
authors.lastname: Walker
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany and II Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Geissel
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany and Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors.forename: Yu A
authors.initials: YA
authors.lastname: Litvinov
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Beckert
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Beller
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Bosch
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Boutin
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Caceres
authors.affiliation: US Army Research Laboratory, Adelphi, Maryland 20783, USA.
authors.forename: J J
authors.initials: JJ
authors.lastname: Carroll
authors.affiliation: Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom.
authors.forename: D M
authors.initials: DM
authors.lastname: Cullen
authors.affiliation: Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.
authors.forename: I J
authors.initials: IJ
authors.lastname: Cullen
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Franzke
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Gerl
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Górska
authors.affiliation: Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.
authors.forename: G A
authors.initials: GA
authors.lastname: Jones
authors.affiliation: Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Kishada
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Knöbel
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Kozhuharov
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Kurcewicz
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: S A
authors.initials: SA
authors.lastname: Litvinov
authors.affiliation: Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
authors.forename: Z
authors.initials: Z
authors.lastname: Liu
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Mandal
authors.affiliation: Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: F
authors.initials: F
authors.lastname: Montes
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Münzenberg
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Nolden
authors.affiliation: Department of Physics, Niigata University, Niigata 950-2181, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ohtsubo
authors.affiliation: National Centre for Nuclear Research, Hoa 69, 00-681 Warszawa, Poland.
authors.forename: Z
authors.initials: Z
authors.lastname: Patyk
authors.affiliation: II Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany.
authors.forename: W R
authors.initials: WR
authors.lastname: Plaß
authors.affiliation: Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.
authors.forename: Zs
authors.initials: Z
authors.lastname: Podolyák
authors.affiliation: Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Rigby
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Saito
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Saito
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany and II Physikalisches Institut, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Scheidenberger
authors.affiliation: Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.
authors.forename: E C
authors.initials: EC
authors.lastname: Simpson
authors.affiliation: Department of Physics, University of Tokyo, Tokyo 113-0033, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Shindo
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Steck
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Sun
authors.affiliation: Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.
authors.forename: S J
authors.initials: SJ
authors.lastname: Williams
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Weick
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Winkler
authors.affiliation: GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt, Germany.
authors.forename: H-J
authors.initials: HJ
authors.lastname: Wollersheim
authors.affiliation: Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamaguchi