title: Hyperfine structure constant of the neutron halo nucleus (11)Be(+).
abstract: The hyperfine splittings of ground state Be+11 have been measured precisely by laser-microwave double resonance spectroscopy for trapped and laser cooled beryllium ions. The ions were produced at relativistic energies and subsequently slowed down and trapped at mK temperatures. The magnetic hyperfine structure constant of Be+11 was determined to be A11=-2677.302 988(72)  MHz from the measurements of the mF-mF'=0-0 field independent transition. This measurement provides essential data for the study of the distribution of the halo neutron in the single neutron halo nucleus Be11 through the Bohr-Weisskopf effect.
authors.affiliation: Nishina Center for Accelerator Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Takamine
authors.affiliation: Nishina Center for Accelerator Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Wada
authors.affiliation: Department of Physics, Sophia University, 7-1 Kioicho, Chiyoda, Tokyo 102-8554, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Okada
authors.affiliation: Nishina Center for Accelerator Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Sonoda
authors.affiliation: Nishina Center for Accelerator Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: P
authors.initials: P
authors.lastname: Schury
authors.affiliation: Atomic Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.affiliation: Atomic Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kanai
authors.affiliation: Nishina Center for Accelerator Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kubo
authors.affiliation: Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Katayama
authors.affiliation: Institute for Laser Science (ILS), The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ohtani
authors.affiliation: Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, USA.
authors.forename: H
authors.initials: H
authors.lastname: Wollnik
authors.affiliation: Department of Physics, Texas A&M University, College Station, Texas 77843, USA.
authors.forename: H A
authors.initials: HA
authors.lastname: Schuessler