Publications (52)
Characterization of magnetic field noise in the ARIADNE source mass rotor
Nancy Aggarwal, Allard Schnabel, Jens Voigt +19
ARIADNE is a nuclear-magnetic-resonance-based experiment that will search for novel axion-induced spin-dependent interactions between an unpolarized source mass rotor and a nearby…
Low velocity quantum reflection of Bose-Einstein condensates
T. A. Pasquini, M. Saba, G. Jo +5
We studied quantum reflection of Bose-Einstein condensates at normal incidence on a square array of silicon pillars. For incident velocities of 2.5-26 mm/s observations agreed with…
Optical Weak Link between Two Spatially Separate Bose-Einstein Condensates
Y. Shin, G. -B. Jo, M. Saba +3
Two spatially separate Bose-Einstein condensates were prepared in an optical double-well potential. A bidirectional coupling between the two condensates was established by two pair…
Optical pumping effect in absorption imaging of F=1 atomic gases
Sooshin Kim, Sang Won Seo, Heung-Ryoul Noh +1
We report our study of the optical pumping effect in absorption imaging of Na atoms in the hyperfine spin states. Solving a set of rate equations for the spin populati…
Precise measurements of optical Feshbach resonances of Yb atoms
Min-Seok Kim, Jeongwon Lee, Jae Hoon Lee +2
We present precise measurements of the optical Feshbach resonances (OFRs) of Yb atoms for the intercombination transition. We measure the photoassociation (PA) spectra of a…
Antiproton Production in Collisions at AGS Energies
I. Chemakin, V. Cianciolo, B. A. Cole +30
Inclusive and semi-inclusive measurements are presented for antiproton () production in proton-nucleus collisions at the AGS. The inclusive yields per event increase stron…
Scintillation and charge extraction from the tracks of energetic electrons in superfluid helium-4
W. Guo, M. Dufault, S. B. Cahn +3
An energetic electron passing through liquid helium causes ionization along its track. The ionized electrons quickly recombine with the resulting positive ions, which leads to the…
Collisional Dynamics of Half-Quantum Vortices in a Spinor Bose-Einstein Condensate
Sang Won Seo, Woo Jin Kwon, Seji Kang +1
We present an experimental study on the interaction and dynamics of half-quantum vortices (HQVs) in an antiferromagnetic spinor Bose-Einstein condensate. By exploiting the orbit mo…
Atom interferometry with Bose-Einstein condensates in a double-well potential
Y. Shin, M. Saba, T. A. Pasquini +3
A trapped-atom interferometer was demonstrated using gaseous Bose-Einstein condensates coherently split by deforming an optical single-well potential into a double-well potential.…
Diagnostics upgrades for investigations of HOM effects in Tesla-type SCRF cavities
A. H. Lumpkin, D. Edstrom, J. Ruan +5
We describe the upgrades to diagnostic capabilities on the Fermilab Accelerator Science and Technology (FAST) electron linear accelerator that will allow investigations of the effe…
A method for controlling the magnetic field near a superconducting boundary in the ARIADNE axion experiment
H. Fosbinder-Elkins, J. Dargert, M. Harkness +7
The QCD Axion is a particle postulated to exist since the 1970s to explain the Strong-CP problem in particle physics. It could also account for all of the observed Dark Matter in t…
Production of K+ and of K- Mesons in Heavy-Ion Collisions from 0.6 to 2.0 AGeV Incident Energy
A. Foerster, F. Uhlig, I. Boettcher +26
This paper summarizes the yields and the emission patterns of K+ and of K- mesons measured in inclusive C+C, Ni+Ni and Au+Au collisions at incident energies from 0.6 AGeV to 2.0 AG…
Flattening a trapped atomic gas using a programmable optical potential in a feedback loop
Sol Kim, Kyuhwan Lee, Jongmin Kim +1
We present a method for producing a flat, large-area Fermi gas of Li with a uniform area density. The method uses a programmable optical potential within a feedback loop to fla…
Topological vortex formation in a Bose-Einstein condensate
A. E. Leanhardt, A. Görlitz, A. P. Chikkatur +4
Vortices were imprinted in a Bose-Einstein condensate using topological phases. Sodium condensates held in a Ioffe-Pritchard magnetic trap were transformed from a non-rotating stat…
First evidence for different freeze-out conditions for kaons and antikaons observed in heavy-ion collisions
A. Foerster, F. Uhlig, I. Boettcher +18
Differential production cross sections of K- and K+ mesons have been measured in Ni+Ni and Au+Au collisions at a beam energy of 1.5 AGeV. The K-/K+ ratio is found to be nearly cons…
Long Phase Coherence Time and Number Squeezing of two Bose-Einstein Condensates on an Atom Chip
G. -B. Jo, Y. Shin, S. Will +6
We measured the relative phase of two Bose-Einstein condensates confined in an radio frequency induced double well potential on an atom chip. We observed phase coherence between th…
Understanding Ultracold Neutron Production in Oxygen Solids from Volume and Temperature Dependent Yields
C. -Y. Liu, C. M. Lavelle, D. J. Salvat +5
We present experimental data on ultracold neutron (UCN) production in solid oxygen from 5 K to 50 K. The experiment used 3 cells of different dimensions in order to study the exces…
Spin and mass currents near a moving magnetic obstacle in a two-component Bose-Einstein condensate
Jong Heum Jung, Hyung Jin Kim, Y. Shin
We study the spatial distributions of the spin and mass currents generated by a moving Gaussian magnetic obstacle in a symmetric, two-component Bose-Einstein condensate in two dime…
Measuring centrality with slow protons in proton-nucleus collisions at the AGS
I. Chemakin, V. Cianciolo, B. A. Cole +27
Experiment 910 has measured slow protons and deuterons from collisions of 18 GeV/c protons with Be, Cu, and Au targets at the BNL AGS. These correspond to the ``grey tracks'' first…
Inkjet Printed 2D-Crystal Based Strain Gauges on Paper
C. Casiraghi, M. Macucci, K. Parvez +6
We present an investigation of inkjet printed strain gauges based on two-dimensional (2D) materials. The technology leverages water-based and biocompatible inks to fabricate strain…
Bose-Einstein condensates near a microfabricated surface
A. E. Leanhardt, Y. Shin, A. P. Chikkatur +3
Magnetically and optically confined Bose-Einstein condensates were studied near a microfabricated surface. Condensate fragmentation observed in microfabricated magnetic traps was n…
Quasi-static strain governing ultrafast spin dynamics
Y. Shin, M. Vomir, D. -H. Kim +3
The quasi-static strain (QSS) is the product generated by the lattice thermal expansion after ultrafast photo-excitation and the effects of thermal and QSS are inextricable. Nevert…
Interference of Bose-Einstein Condensates on an Atom Chip
Y. Shin, C. Sanner, G. -B. Jo +6
We have used a microfabricated atom chip to split a single Bose-Einstein condensate of sodium atoms into two spatially separated condensates. Dynamical splitting was achieved by de…
Review of the results of the KaoS Collaboration
A. Foerster, I. Boettcher, F. Dohrmann +21
The production of K+ and of K- mesons in heavy-ion collisions at beam energies of 1 to 2 AGeV has systematically been investigated with the Kaon Spectrometer KaoS. The ratio of the…
Inclusive Soft Pion Production from 12.3 and 17.5 GeV/c Protons on Be, Cu and Au
I. Chemakin, V. Cianciolo, B. A. Cole +29
Differential cross-sections are presented for the inclusive production of charged pions in the momentum range 0.1 to 1.2 GeV/c in interactions of 12.3 and 17.5 GeV/c protons with B…
Rotating a Bose-Einstein condensate by shaking an anharmonic axisymmetric magnetic potential
Seji Kang, J. Choi, S. W. Seo +2
We present an experimental method for rotating a Bose-Einstein condensate trapped in an axisymmetric magnetic potential. This method is based on the anharmonicity of the trapping p…
Dynamical Instability of a Doubly Quantized Vortex in a Bose-Einstein condensate
Y. Shin, M. Saba, M. Vengalattore +6
Doubly quantized vortices were topologically imprinted in Na condensates, and their time evolution was observed using a tomographic imaging technique. The decay into…
Coreless vortex formation in a spinor Bose-Einstein condensate
A. E. Leanhardt, Y. Shin, D. Kielpinski +2
Coreless vortices were phase-imprinted in a spinor Bose-Einstein condensate. The three-component order parameter of F=1 sodium condensates held in a Ioffe-Pritchard magnetic trap w…
The Emission Pattern of High-Energy Pions: A New Probe for the Early Phase of Heavy Ion Collisions
A. Wagner, C. Muentz, H. Oeschler +20
The emission pattern of charged pions has been measured in Au+Au collisions at 1 GeV/nucleon incident energy. In peripheral collisions and at target rapidities, high-energy pions a…
Observation of different azimuthal emission patterns for K+ and of K- mesons in Heavy Ion Collisions at 1-2 AGeV
F. Uhlig, A. Foerster, I. Boettcher +18
Azimuthal distributions of pi+, K+ and K- mesons have been measured in Au+Au reactions at 1.5 AGeV and Ni+Ni reactions at 1.93 AGeV. In semi-central collisions at midrapidity, pi+…
Enhanced Out-of-plane Emission of K+ Mesons observed in Au+Au Collisions at 1 AGeV
Y. Shin, W. Ahner, R. Barth +22
The azimuthal angular distribution of K+ mesons has been measured in Au + Au collisions at 1 AGeV. In peripheral and semi-central collisions, K+ mesons preferentially are emitted p…
Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity
Y. Shin, C. H. Schunck, A. Schirotzek +1
We present spatially resolved radio-frequency spectroscopy of a trapped Fermi gas with resonant interactions and observe a spectral gap at low temperatures. The spatial distributio…
Distillation of Bose-Einstein condensates in a double-well potential
Y. Shin, M. Saba, A. Schirotzek +4
Bose-Einstein condensates of sodium atoms, prepared in an optical dipole trap, were distilled into a second empty dipole trap adjacent to the first one. The distillation was driven…
Semi-Inclusive Lambda and Kshort Production in p-Au Collisions at 17.5 GeV/c
I. Chemakin, V. Cianciolo, B. A. Cole +27
The first detailed measurements of the centrality dependence of strangeness production in p-A collisions are presented. Lambda and Kshort dn/dy distributions from 17.5 GeV/c p-Au c…
Pion Production by Protons on a Thin Beryllium Target at 6.4, 12.3, and 17.5 GeV/c Incident Proton Momenta
E910 Collaboration, I. Chemakin, V. Cianciolo +32
An analysis of inclusive pion production in proton-beryllium collisions at 6.4, 12.3, and 17.5 GeV/c proton beam momentum has been performed. The data were taken by Experiment 910…
Production of Charged Pions, Kaons and Antikaons in Relativistic C+C and C+Au Collisions
F. Laue, I. Boettcher, M. Debowski +19
Production cross sections of charged pions, kaons and antikaons have been measured in C+C and C+Au collisions at beam energies of 1.0 and 1.8 AGeV for different polar emission angl…
Efficient ensemble randomization by tuning chaos in a nonlinear spin-1 system
Jongmin Kim, Minsung Jeong, Jongyoon Han +1
We present an efficient scheme to randomize a spin-state ensemble in a nonlinear spin-1 system by tuning chaos with an external periodic drive. Without modulation, the system exhib…
Progress on the ARIADNE axion experiment
A. A. Geraci, H. Fosbinder-Elkins, C. Lohmeyer +17
The Axion Resonant InterAction Detection Experiment (ARIADNE) is a collaborative effort to search for the QCD axion using techniques based on nuclear magnetic resonance. In the exp…
Dynamic similarity of vortex shedding in a superfluid flowing past a penetrable obstacle
Junhwan Kwon, Y. Shin
We numerically investigate wake dynamics in a superfluid flowing past a penetrable obstacle. Unlike an impenetrable object, a penetrable obstacle does not fully deplete the density…
Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
Y. Shin, M. W. Zwierlein, C. H. Schunck +2
We have observed phase separation between the superfluid and the normal component in a strongly interacting Fermi gas with imbalanced spin populations. The in situ distribution of…
Neutronic Design and Measured Performance of the Low Energy Neutron Source (LENS) Target Moderator Reflector Assembly
C. M. Lavelle, D. V. Baxter, A. Bogdanov +12
The Low Energy Neutron Source (LENS) is an accelerator-based pulsed cold neutron facility under construction at the Indiana University Cyclotron Facility (IUCF). The idea behind LE…
Evidence for Different Freeze-Out Radii of High- and Low-Energy Pions Emitted in Au+Au Collisions at 1 GeV/nucleon
A. Wagner, C. Müntz, H. Oeschler +20
Double differential production cross sections of negative and positive pions and the number of participating protons have been measured in central Au+Au collisions at 1 GeV per nuc…
Evidence for a Soft Nuclear Equation-of-State from Kaon Production in Heavy Ion Collisions
C. Sturm, I. Boettcher, M. Debowski +18
The production of pions and kaons has been measured in Au+Au collisions at beam energies from 0.6 to 1.5 AGeV with the Kaon Spectrometer at SIS/GSI. The K+ meson multiplicity per n…
First Measurement of Antikaon Phase-Space Distributions in Nucleus-Nucleus Collisions at Subthreshold Beam Energies
M. Menzel, I. Boettcher, M. Debowski +18
Differential production cross sections of K and K mesons have been measured as function of the polar emission angle in Ni+Ni collisions at a beam energy of 1.93 AGeV. In ne…
Micromegas TPC studies at high magnetic fields using the charge dispersion signal
M. Dixit, D. Attie, A. Bellerive +10
The International Linear Collider (ILC) Time Projection Chamber (TPC) transverse space-point resolution goal is 100 microns for all tracks including stiff 90 degree tracks with the…
Propagation of Bose-Einstein condensates in a magnetic waveguide
A. E. Leanhardt, A. P. Chikkatur, D. Kielpinski +4
Gaseous Bose-Einstein condensates of 2-3 million atoms were loaded into a microfabricated magnetic trap using optical tweezers. Subsequently, the condensates were released into a m…
Centrality dependence of Pi- Production and Stopping in p-A Collisions at 18 GeV/c
I. Chemakin, V. Cianciolo, B. A. Cole +27
First results are presented from BNL experiment E910 on pion production and stopping in proton-Be, Cu, and Au collisions at a beam momentum of 18 GeV/c. We characterize the central…
Kibble-Zurek universality in a strongly interacting Fermi superfluid
Bumsuk Ko, Jee Woo Park, Y. Shin
Near a continuous phase transition, systems with different microscopic origins display universal dynamics if their underlying symmetries are compatible. In a thermally quenched sys…
Ultracold Neutron Production in a Pulsed Neutron Beam Line
C. M. Lavelle, W. Fox, G. Manus +9
We present the results of an Ultracold neutron (UCN) production experiment in a pulsed neutron beam line at the Los Alamos Neutron Scattering Center. The experimental apparatus all…
First observation of in-medium effects on phase space distributions of antikaons measured in proton-nucleus collisions
W. Scheinast, I. Boettcher, M. Debowski +19
Differential production cross sections of mesons have been measured in + C and + Au collisions at 1.6, 2.5 and 3.5 GeV proton beam energy. At beam energies close…
Medium Effects in Kaon and Antikaon Production in Nuclear Collisions at Subthreshold Beam Energies
F. Laue, C. Sturm, I. Boettcher +18
Production cross sections of K and K mesons have been measured in C+C collisions at beam energies per nucleon below and near the nucleon-nucleon threshold. At a given beam…
Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
C. H. Schunck, Y. Shin, A. Schirotzek +2
Radio-frequency spectroscopy is used to study pairing in the normal and superfluid phases of a strongly interacting Fermi gas with imbalanced spin populations. At high spin imbalan…