A5068255814- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Dark Matter and Cosmic Phenomena
- Advanced Frequency and Time Standards
- Atomic and Molecular Physics
- Quantum, superfluid, helium dynamics
- Advanced MRI Techniques and Applications
- Nuclear physics research studies
- Nuclear Physics and Applications
- Particle physics theoretical and experimental studies
- Spectroscopy and Laser Applications
- Cosmology and Gravitation Theories
- Radioactive Decay and Measurement Techniques
- Particle Accelerators and Free-Electron Lasers
- Quantum optics and atomic interactions
- Pulsars and Gravitational Waves Research
- Advanced Chemical Physics Studies
- Geophysics and Sensor Technology
- Force Microscopy Techniques and Applications
- Fetal and Pediatric Neurological Disorders
- Protein Interaction Studies and Fluorescence Analysis
- Astro and Planetary Science
- Scientific Measurement and Uncertainty Evaluation
- Astrophysics and Cosmic Phenomena
- Advanced Materials Characterization Techniques
Bucknell University
2019-2023
University of Wisconsin–Madison
2013-2019
Fermi National Accelerator Laboratory
2007-2012
University of Chicago
2007-2012
Argonne National Laboratory
2007-2012
Allegheny College
2003
The root-mean-square (rms) nuclear charge radius of ^8He, the most neutron-rich all particle-stable nuclei, has been determined for first time to be 1.93(3) fm. In addition, rms ^6He was measured 2.068(11) fm, in excellent agreement with a previous result. significant reduction from ^8He is an indication change correlations excess neutrons and consistent neutron halo structure. experiment based on laser spectroscopy individual helium atoms cooled confined magneto-optical trap. Charge radii...
Abstract Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can form stable, macroscopic field configurations in the of topological defects that could concentrate matter density into many distinct, compact spatial regions small compared with Galaxy but much larger than Earth. Here we report results search transient signals from domain walls by using global network optical magnetometers exotic (GNOME) physics searches. We data, consisting correlated...
This paper reports on the search for ultralight dark matter in form of axions and photons using an innovative experimental design which earth serves as a transducer converting into characteristic magnetic field signal. The magnetometers used to detect expected patterns are placed areas noise sources, such anthropogenic ones, minimal. Although no conclusive detection is reported, limits set models various parameter ranges prospects refining methodology presented.
Atomic magnetometers (AMs) offer many advantages over superconducting quantum interference devices due to, among other things, having comparable sensitivity while not requiring cryogenics. One of the major limitations AMs is challenge configuring them as gradiometers. We report development a spin-exchange relaxation free vector atomic magnetic gradiometer with 3 fT cm-1 Hz-1/2 and common mode rejection ratio >150 in band from DC to 100 Hz. introduce background suppression figure merit for...
We demonstrate a technique for transferring ${}^{226}$Ra atoms from three-dimensional magneto-optical trap (MOT) into standing wave optical dipole (ODT) in an adjacent chamber. The resulting small trapping volume (120 $\ensuremath{\mu}$m diameter) allows high control of the electric and magnetic fields applied to atoms. are first transferred traveling-wave trap, which is then translated 46 cm science subsequently orthogonal standing-wave ODT by application one-dimensional MOT along axis. For...
Abstract Numerous observations suggest that there exist undiscovered beyond‐the‐standard‐model particles and fields. Because of their unknown nature, these exotic fields could interact with standard model in many different ways assume a variety possible configurations. Here, an overview the global network optical magnetometers for physics searches (GNOME), ongoing experimental program designed to test wide range scenarios, is presented. The GNOME experiment utilizes worldwide shielded atomic...
In atomic magnetometers, the vector AC-Stark shift associated with circularly polarized light generates spatially varying effective magnetic fields which limit magnetometer response and serve as sources of noise. We describe a scheme whereby optically pumping small sub-volume cell relying on diffusion to transport atoms allows be operated minimal sensitivity field.
Numerous observations suggest that there exist undiscovered beyond-the-Standard-Model particles and fields. Because of their unknown nature, these exotic fields could interact with Standard Model in many different ways assume a variety possible configurations. Here we present an overview the Global Network Optical Magnetometers for Exotic physics searches (GNOME), our ongoing experimental program designed to test wide range scenarios. The GNOME experiment utilizes worldwide network shielded...
The lifetime of the $7s6d$ ${^{1}D}_{2}$ state atomic radium is determined to be $385(45)\text{ }\ensuremath{\mu}\text{s}$ using cold $^{226}\text{R}\text{a}$ atoms prepared in a magneto-optical trap. populated from decay ${^{1}P}_{1}$ which excited by pulse 483 nm light. observed detecting delayed fluorescence at 714 last step sequence ${^{1}P}_{1}\text{\ensuremath{-}}{^{1}D}_{2}\text{\ensuremath{-}}{^{3}P}_{1}\text{\ensuremath{-}}{^{1}S}_{0}$. measured compared number theoretical...
Abstract Results are reported from the first full-scale search for transient signals exotic fields of astrophysical origin using data a newly constructed Earth-scale detector: Global Network Optical Magnetometers Exotic physics searches (GNOME). Data collected by GNOME consist correlated measurements optical atomic magnetometers located in laboratories all over world. searched patterns propagating through network consistent with composed ultralight bosons such as axion-like particles (ALPs)....
Two anomalously weak transitions within the $2\text{ }^{3}S_{1}\ensuremath{-}3\text{ }^{3}P_{J}$ manifolds in $^{3}\mathrm{He}$ have been identified. Their transition strengths are measured to be 1000 times weaker than that of strongest same group. This dramatic suppression is due dominance hyperfine interaction over fine-structure interaction. An alternative selection rule based on $IS$ coupling (where nuclear spin first coupled total electron spin) proposed. provides qualitative...
We present an analysis method to search for exotic low-mass field (ELF) bursts generated during large energy astrophysical events such as supernovae, binary black hole or neutron star mergers, and fast radio using the Global Network of Optical Magnetometers Exotic physics searches (GNOME). In our model, associated gravitational waves electromagnetic signals herald arrival ELF burst that interacts via coupling spin fermions in magnetometers. This enables GNOME serve a tool multi-messenger...
We report measurements of the isotope shift mass 104, 105, 106, 108, and 110 stable palladium isotopes for transitions from metastable state $4{d}^{9}{(}^{2}{D}_{5/2})5s,{\phantom{\rule{0.16em}{0ex}}}^{2}{[5/2]}_{3}\ensuremath{\rightarrow}4{d}^{9}{(}^{2}{D}_{5/2})5p,{\phantom{\rule{0.16em}{0ex}}}^{2}{[7/2]}_{4}^{o}$ at 340 nm,...
We report experimentally measured cross sections for pressure broadening of ammonia inversion transitions by J=0, ortho-D2 at temperatures 18–40 K. These measurements were made in a quasiequilibrium cell using the collisional cooling technique. Cross metastable (J,K)=(1, 1), (2, 2) and (3, 3) ranged from 67.5 Å2 (1, 1) 20.0 K to 100.1 25.0 The found be consistently larger than previously low temperature NH3 both He H2.
Earth can act as a transducer to convert ultralight bosonic dark matter (axions and hidden photons) into an oscillating magnetic field with characteristic pattern across its surface. Here we describe the first results of dedicated experiment, Search for Non-Interacting Particles Experimental Hunt (SNIPE Hunt), that aims detect such dark-matter-induced magnetic-field patterns by performing correlated measurements network magnetometers in relatively quiet environments (in wilderness far from...