title: Precise electromagnetic tests of ab initio calculations of light nuclei: states in 10Be.
abstract: In order to test ab initio calculations of light nuclei, we have remeasured lifetimes in 10Be using the Doppler shift attenuation method (DSAM) following the 7Li(7Li,alpha)10Be reaction at 8 and 10 MeV. The new experiments significantly reduce systematic uncertainties in the DSAM technique. The J(pi) = 2(1)(+) state at 3.37 MeV has tau = 205 +/- (5)(stat) +/- (7)(sys) fs corresponding to a B(E2 down) of 9.2(3)e(2) fm(4) in broad agreement with many calculations. The J(pi) = 2(2)(+) state at 5.96 MeV was found to have a B(E2 down) of 0.11(2)e(2) fm(4) and provides a more discriminating test of nuclear models. New Green's function Monte Carlo calculations for these states and transitions with a number of Hamiltonians are also reported and compared to experiment.
authors.affiliation: Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: E A
authors.initials: EA
authors.lastname: McCutchan
authors.forename: C J
authors.initials: CJ
authors.lastname: Lister
authors.forename: R B
authors.initials: RB
authors.lastname: Wiringa
authors.forename: Steven C
authors.initials: SC
authors.lastname: Pieper
authors.forename: D
authors.initials: D
authors.lastname: Seweryniak
authors.forename: J P
authors.initials: JP
authors.lastname: Greene
authors.forename: M P
authors.initials: MP
authors.lastname: Carpenter
authors.forename: C J
authors.initials: CJ
authors.lastname: Chiara
authors.forename: R V F
authors.initials: RV
authors.lastname: Janssens
authors.forename: T L
authors.initials: TL
authors.lastname: Khoo
authors.forename: T
authors.initials: T
authors.lastname: Lauritsen
authors.forename: I
authors.initials: I
authors.lastname: Stefanescu
authors.forename: S
authors.initials: S
authors.lastname: Zhu