7 research outputs found
Observation of Heteronuclear Feshbach Molecules from a Rb - Rb gas
We report on the observation of ultracold heteronuclear Feshbach molecules.
Starting with a Rb BEC and a cold atomic gas of Rb, we utilize
previously unobserved interspecies Feshbach resonances to create up to 25,000
molecules. Even though the Rb gas is non-degenerate we observe a large
molecular conversion efficiency due to the presence of a quantum degenerate
Rb gas; this represents a key feature of our system. We compare the
molecule creation at two different Feshbach resonances with different
magnetic-field widths. The two Feshbach resonances are located at
G and G. We also directly measure the small
binding energy of the molecules through resonant magnetic-field association.Comment: v2 - minor change
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Observation of Heteronuclear Feshbach Molecules from a 85Rb – 87Rb gas
We report on the observation of ultracold heteronuclear Feshbach molecules. Starting with a 87Rb Bose-Einstein condensate and a cold atomic gas of 85Rb, we utilize previously unobserved interspecies Feshbach resonances to create up to 25,000 molecules. Even though the 85Rb gas is nondegenerate, we observe a large molecular conversion efficiency due to the presence of a quantum degenerate 87Rb gas; this represents a key feature of our system. We compare the molecule creation at two different Feshbach resonances with different magnetic-field widths. The two Feshbach resonances are located at 265.44±0.15 G and 372.4±1.3 G. We also directly measure the small binding energy of the molecules through resonant magnetic-field association
Studying a dual-species BEC with tunable interactions
We report on the observation of controllable spatial separation in a
dual-species Bose-Einstein condensate (BEC) with Rb and Rb.
Interparticle interactions between the different components can change the
miscibility of the two quantum fluids. In our experiments, we clearly observe
the immiscible nature of the two simultaneously Bose-condensed species via
their spatial separation. Furthermore the Rb Feshbach resonance near 155
G is used to change them between miscible and immiscible by tuning the
Rb scattering length. Our apparatus is also able to create Rb
condensates with up to atoms which represents a significant
improvement over previous work
Tunable Miscibility in a Dual-Species Bose-Einstein Condensate
We report on the observation of controllable phase separation in a dual-species Bose-Einstein condensate with 85Rb and 87Rb. Interatomic interactions between the different components determine the miscibility of the two quantum fluids. In our experiments, we can clearly observe immiscible behavior via a dramatic spatial separation of the two species. Furthermore, a magnetic-field Feshbach resonance is used to change them between miscible and immiscible by tuning the 85Rb scattering length. The spatial density pattern of the immiscible quantum fluids exhibits complex alternating-domain structures that are uncharacteristic of its stationary ground state
Exactly solvable models for triatomic-molecular Bose-Einstein Condensates
We construct a family of triatomic models for heteronuclear and homonuclear
molecular Bose-Einstein condensates. We show that these new generalized models
are exactly solvable through the algebraic Bethe ansatz method and derive their
corresponding Bethe ansatz equations and energies.Comment: 11 page
Centrality dependence of high pT hadron suppression in Au+Au collisions at sqrt(sNN)=130 GeV
Inclusive transverse momentum distributions of charged hadrons within
0.2<pT<6.0 GeV/c have been measured over a broad range of centrality for Au+Au
collisions at sqrt(sNN)=130 GeV. Hadron yields are suppressed at high pT in
central collisions relative to peripheral collisions and to a nucleon-nucleon
reference scaled for collision geometry. Peripheral collisions are not
suppressed relative to the nucleon-nucleon reference. The suppression varies
continuously at intermediate centralities. The results indicate significant
nuclear medium effects on high pT hadron production in heavy ion collisions at
high energy.Comment: As published. Change from v1: expanded discussion of systematic
uncertaintie