title: Crossing of shears bands in (197)Pb: B(M1) values and semiclassical description.
abstract: Subpicosecond lifetimes of states in shears band 1 in (197)Pb were measured by means of the recoil distance method employing Gammasphere and the New Yale Plunger Device. The extracted reduced matrix elements, B(M1), show a clear sensitivity to the crossing of different shears configurations reflecting the closing and reopening of the shears blades. The energies and B(M1) values in the band crossing region are successfully described in the framework of the semiclassical model of the shears bands. The relevance of core rotation contributions are shown. The results point to the existence of shears states with an angular momentum coupling angle larger than 90 degrees.
authors.affiliation: A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Cooper
authors.forename: R
authors.initials: R
authors.lastname: Krücken
authors.forename: C W
authors.initials: CW
authors.lastname: Beausang
authors.forename: J R
authors.initials: JR
authors.lastname: Novak
authors.forename: A
authors.initials: A
authors.lastname: Dewald
authors.forename: T
authors.initials: T
authors.lastname: Klug
authors.forename: G
authors.initials: G
authors.lastname: Kemper
authors.forename: P
authors.initials: P
authors.lastname: von Brentano
authors.forename: M P
authors.initials: MP
authors.lastname: Carpenter
authors.forename: R V
authors.initials: RV
authors.lastname: Janssens
authors.forename: C J
authors.initials: CJ
authors.lastname: Lister
authors.forename: I
authors.initials: I
authors.lastname: Wiedenhöver