title: Magnetic Rotation in the A = 80 Region: M1 Bands in Heavy Rb Isotopes.
abstract: We have studied the isotopes (82)Rb45, (83)Rb46, and (84)Rb47 to search for magnetic rotation which is predicted in the tilted-axis cranking model for a certain mass region around A = 80. Excited states in these nuclei were populated via the reaction (11)B + (76)Ge with E = 50 MeV at the XTU tandem accelerator of the LNL Legnaro. Based on a γ-coincidence experiment using the spectrometer GASP we have found magnetic dipole bands in each studied nuclide. The regular M1 bands observed in the odd-odd nuclei (82)Rb and (84)Rb include B(M1)/B(E2) ratios decreasing smoothly with increasing spin in a range of 13(-) ≤ J(π) ≤ 16(-). These bands are interpreted in the tilted-axis cranking model on the basis of four-quasiparticle configurations of the type [Formula: see text]. This is the first evidence of magnetic rotation in the A ≈ 80 region. In contrast, the M1 sequences in the odd-even nucleus (83)Rb are not regular, and the B(M1)/B(E2) ratios show a pronounced staggering.
authors.affiliation: Institut für Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Schwengner
authors.affiliation: Institut für Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Schnare
authors.affiliation: Institut für Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Frauendorf
authors.affiliation: Institut für Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Dönau
authors.affiliation: Institut für Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Käubler
authors.affiliation: Institut für Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Prade
authors.affiliation: Institut für Kern- und Hadronenphysik, FZ Rossendorf, 01314 Dresden, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Grosse
authors.affiliation: II. Physikalisches Institut, Universität Göttingen, 37073 Göttingen, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Jungclaus
authors.affiliation: II. Physikalisches Institut, Universität Göttingen, 37073 Göttingen, Germany.
authors.forename: K P
authors.initials: KP
authors.lastname: Lieb
authors.affiliation: II. Physikalisches Institut, Universität Göttingen, 37073 Göttingen, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Lingk
authors.affiliation: Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Skoda
authors.affiliation: Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Eberth
authors.affiliation: INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro, Italy.
authors.forename: G
authors.initials: G
authors.lastname: de Angelis
authors.affiliation: INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Gadea
authors.affiliation: INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Farnea
authors.affiliation: INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro, Italy.
authors.forename: D R
authors.initials: DR
authors.lastname: Napoli
authors.affiliation: INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro, Italy.
authors.forename: C A
authors.initials: CA
authors.lastname: Ur
authors.affiliation: INFN, Sezione di Milano, 20133 Milano, Italy.
authors.forename: G L
authors.initials: GL
authors.lastname: Bianco
keywords: in-beam γ-spectroscopy; magnetic dipole bands; tilted-axis cranking model