title: Quadrupole collectivity in neutron-rich Fe and Cr isotopes.
abstract: Intermediate-energy Coulomb excitation measurements are performed on the N ≥ 40 neutron-rich nuclei (66,68)Fe and (64)Cr. The reduced transition matrix elements providing a direct measure of the quadrupole collectivity B(E2;2(1)(+) → 0(1)(+)) are determined for the first time in (68)Fe(42) and (64)Cr(40) and confirm a previous recoil distance method lifetime measurement in (66)Fe(40). The results are compared to state-of-the-art large-scale shell-model calculations within the full fpgd neutron orbital model space using the Lenzi-Nowacki-Poves-Sieja effective interaction and confirm the results of the calculations that show these nuclei are well deformed.
authors.affiliation: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: H L
authors.initials: HL
authors.lastname: Crawford
authors.affiliation: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Clark
authors.affiliation: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: P
authors.initials: P
authors.lastname: Fallon
authors.affiliation: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: A O
authors.initials: AO
authors.lastname: Macchiavelli
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: T
authors.initials: T
authors.lastname: Baugher
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: D
authors.initials: D
authors.lastname: Bazin
authors.affiliation: University of Richmond, Richmond, Virginia 23173, USA.
authors.forename: C W
authors.initials: CW
authors.lastname: Beausang
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Berryman
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: D L
authors.initials: DL
authors.lastname: Bleuel
authors.affiliation: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: C M
authors.initials: CM
authors.lastname: Campbell
authors.affiliation: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: M
authors.initials: M
authors.lastname: Cromaz
authors.affiliation: Laboratori Nazionali di Legnaro, INFN, I-35020 Legnaro, Padova, Italy.
authors.forename: G
authors.initials: G
authors.lastname: de Angelis
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: A
authors.initials: A
authors.lastname: Gade
authors.affiliation: University of Richmond, Richmond, Virginia 23173, USA.
authors.forename: R O
authors.initials: RO
authors.lastname: Hughes
authors.affiliation: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: I Y
authors.initials: IY
authors.lastname: Lee
authors.affiliation: Dipartimento di Fisica dell'Università and INFN, Sezione di Padova, I-35131 Padova, Italy.
authors.forename: S M
authors.initials: SM
authors.lastname: Lenzi
authors.affiliation: IPHC, IN2P3-CNRS et Université de Strasbourg, F-67037 Strasbourg, France.
authors.forename: F
authors.initials: F
authors.lastname: Nowacki
authors.affiliation: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: S
authors.initials: S
authors.lastname: Paschalis
authors.affiliation: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: M
authors.initials: M
authors.lastname: Petri
authors.affiliation: Departamento de Física Teórica e IFT-UAM/CSIC, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Poves
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: A
authors.initials: A
authors.lastname: Ratkiewicz
authors.affiliation: University of Richmond, Richmond, Virginia 23173, USA.
authors.forename: T J
authors.initials: TJ
authors.lastname: Ross
authors.affiliation: Laboratori Nazionali di Legnaro, INFN, I-35020 Legnaro, Padova, Italy.
authors.forename: E
authors.initials: E
authors.lastname: Sahin
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: D
authors.initials: D
authors.lastname: Weisshaar
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA.
authors.forename: K
authors.initials: K
authors.lastname: Wimmer
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: R
authors.initials: R
authors.lastname: Winkler