title: Direct Lifetime Measurements of the Excited States in (72)Ni.
abstract: The lifetimes of the first excited 2^{+} and 4^{+} states in ^{72}Ni were measured at the National Superconducting Cyclotron Laboratory with the recoil-distance Doppler-shift method, a model-independent probe to obtain the reduced transition probability. Excited states in ^{72}Ni were populated by the one-proton knockout reaction of an intermediate energy ^{73}Cu beam. γ-ray-recoil coincidences were detected with the γ-ray tracking array GRETINA and the S800 spectrograph. Our results provide evidence of enhanced transition probability B(E2;2^{+}→0^{+}) as compared to ^{68}Ni, but do not confirm the trend of large B(E2) values reported in the neighboring isotope ^{70}Ni obtained from Coulomb excitation measurement. The results are compared to shell model calculations. The lifetime obtained for the excited 4_{1}^{+} state is consistent with models showing decay of a seniority ν=4, 4^{+} state, which is consistent with the disappearance of the 8^{+} isomer in ^{72}Ni.
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.|Lawrence Livermore National Laboratory, Livermore, California 94551, USA.
authors.forename: K
authors.initials: K
authors.lastname: Kolos
authors.affiliation: TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: D
authors.initials: D
authors.lastname: Miller
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.|Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6371, USA.
authors.forename: R
authors.initials: R
authors.lastname: Grzywacz
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.|Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: H
authors.initials: H
authors.lastname: Iwasaki
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: M
authors.initials: M
authors.lastname: Al-Shudifat
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
authors.forename: D
authors.initials: D
authors.lastname: Bazin
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.|Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6371, USA.
authors.forename: C R
authors.initials: CR
authors.lastname: Bingham
authors.affiliation: Institut für Kernphysik der Universität zu Köln, D-50937 Köln, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Braunroth
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: G
authors.initials: G
authors.lastname: Cerizza
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.|Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: A
authors.initials: A
authors.lastname: Gade
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
authors.forename: A
authors.initials: A
authors.lastname: Lemasson
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.|Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: S N
authors.initials: SN
authors.lastname: Liddick
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: M
authors.initials: M
authors.lastname: Madurga
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.|Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: C
authors.initials: C
authors.lastname: Morse
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
authors.forename: M
authors.initials: M
authors.lastname: Portillo
authors.affiliation: TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: M M
authors.initials: MM
authors.lastname: Rajabali
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
authors.forename: F
authors.initials: F
authors.lastname: Recchia
authors.affiliation: Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.|Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6371, USA.
authors.forename: L L
authors.initials: LL
authors.lastname: Riedinger
authors.affiliation: Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada.
authors.forename: P
authors.initials: P
authors.lastname: Voss
authors.affiliation: University of Maryland, College Park, Maryland 20742, USA.
authors.forename: W B
authors.initials: WB
authors.lastname: Walters
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.
authors.forename: D
authors.initials: D
authors.lastname: Weisshaar
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA.|Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
authors.forename: K
authors.initials: K
authors.lastname: Whitmore
authors.affiliation: Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA.
authors.forename: K
authors.initials: K
authors.lastname: Wimmer
authors.affiliation: Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom.
authors.forename: J A
authors.initials: JA
authors.lastname: Tostevin