March 1, 2013GRETINA workshop 20131 Coulomb excitation of even 108-112 Ru and 104-108 Mo isotopes Juho Rissanen Nuclear Structure Group, Lawrence Berkeley.

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Presentation transcript:

March 1, 2013GRETINA workshop Coulomb excitation of even Ru and Mo isotopes Juho Rissanen Nuclear Structure Group, Lawrence Berkeley National Laboratory

March 1, 2013GRETINA workshop COULEX with GRETINA and CHICO2 Highest CARIBU yields at Z≈42,N≈64 in the lower mass region ( 106 Mo) Reaccelerated beams of refractory elements low E(2+) -> high B(E2) -> high Coulomb excitation cross-section Multiple Coulex of Ru/Mo isotopes on heavy target at “safe” energies CHICO2 GRETINA Good Doppler correction -> better energy resolution December 2012

March 1, 2013GRETINA workshop Physics motivation, nuclear shapes r-process path Shape evolution vs mass? Variety of different shapes oblate prolate triaxial Shape evolution vs spin? 50 Ru Mo 82 N=64N=66N=68 N=70 ħω=0 ħω=0.2 MeV ħω=0.4 MeV ħω=0.6 MeV 112 Ru Ru isotopes Faisal et al., PRC 82, (2010)

March 1, 2013GRETINA workshop Shape coexistence in Kr isotopes Coulomb excitation of 74,76 Kr beams with 208 Pb target at GANIL at safe energies High-statistics data allows determination of deformation parameters Q and cos(3δ) for different states 74 Kr, 150 hours, 1E4 beam intensity, ≈99% pure Clement, PRC 75, (2007) θc.m. ≈beta ≈ gamma

March 1, 2013GRETINA workshop Summary GRETINA+CHICO+CARIBU allows Coulomb excitation studies of neutron-rich Ru and Mo isotopes Systematic studies of the shape evolution vs. I,Z in the A=110 region (prolate, oblate, shape coexistence, triaxiality) Thanks for your attention What are the experimental limitations? –Beam intensity? With December 2012 performance, 104,106 Mo possible in 12 days of beam time. 3 x increase allows 108 Mo also –Beam purity? How well the impurities are known? –Beam energy, ΔE?

March 1, 2013GRETINA workshop Backup slides

March 1, 2013GRETINA workshop Analysis Gamma intensities ->CE cross-section Mo and Ru isotopes, level schemes known, some level lifetimes known -> input everything to GOSIA code vary parameters -> try to extract diagonal matrix elements -> static quadrupole moment Q 0 for a given state Rather complete set of matrix elements needed IfIf IiIi MfMf Nuclear reorientation effect dσ/dΩ=f[B(E2),Q], 2 nd order

March 1, 2013GRETINA workshop Some mathematics Measurable matrix elements Q is a quadrupole deformation parameter (Bohr’s β) cos (3δ) is a triaxiality parameter (Bohr’s γ)

March 1, 2013GRETINA workshop Experiment 106 Mo: B(E2)= Kr: B(E2)=0.84 ->σ( 106 Mo)≈ σ( 74 Kr) x 1.6 Is the mass resolution good enough? Good gamma energy/position resolution needed to tolerate beam impurities ~1 mg/cm 2 thick 208 Pb target factor of 2 down in gamma efficiency More intense beam appreciated to measure several cases / beam time counts in photopeak needed

March 1, 2013GRETINA workshop Beam time days Factor of 2 down in gamma efficiency counts in a photopeak Isotopeσ CE vs KrBeam vs KrBeam time days 108 Ru Ru Ru Mo Mo Mo Mo

March 1, 2013GRETINA workshop Other examples Q, cos 3δ vs mass Q, cos 3δ vs spin Cline Ann. Rev. Nucl. Part. Sci. 36, 683 (1986) g.s. band γ band band0 + 3 band