Search for High-energy Neutrinos from Binary Neutron Star Merger GW170817...
The Advanced LIGO and Advanced Virgo observatories recently discovered gravitational waves from a binary neutron star inspiral. A short gamma-ray burst (GRB) that followed the merger of this binary...
View ArticleFirst Search for Dark Matter Annihilations in the Earth with the IceCube...
We present the results of the first IceCube search for dark matter annihilation in the center of the Earth. Weakly interacting massive particles (WIMPs), candidates for dark matter, can scatter off...
View ArticleSearch for High-energy Neutrinos from Gravitational Wave Event GW151226 and...
The Advanced LIGO observatories detected gravitational waves from two binary black hole mergers during their first observation run (O1). We present a high-energy neutrino follow-up search for the...
View ArticleSearch for Neutrinos from Dark Matter Self-Annihilations in the Center of the...
We present a search for a neutrino signal from dark matter self-annihilations in the Milky Way using the IceCube Neutrino Observatory (IceCube). In 1005 days of data we found no significant excess of...
View ArticleSearch for Nonstandard Neutrino Interactions with Icecube Deepcore
As atmospheric neutrinos propagate through the Earth, vacuumlike oscillations are modified by Standard Model neutral- and charged-current interactions with electrons. Theories beyond the Standard...
View ArticleThe IceCube Neutrino Observatory: Instrumentation and Online Systems
The IceCube Neutrino Observatory is a cubic-kilometer-scale high-energy neutrino detector built into the ice at the South Pole. Construction of IceCube, the largest neutrino detector built to date,...
View ArticleThe IceCube Realtime Alert System
Although high-energy astrophysical neutrinos were discovered in 2013, their origin is still unknown. Aiming for the identification of an electromagnetic counterpart of a rapidly fading source, we have...
View ArticleLimit on the Electric Charge of Antihydrogen
The ALPHA collaboration has successfully demonstrated the production and the confinement of cold antihydrogen, H̅. An analysis of trapping data allowed a stringent limit to be placed on the electric...
View ArticleNeutrino Interferometry for High-Precision Tests of Lorentz Symmetry with...
Lorentz symmetry is a fundamental spacetime symmetry underlying both the standard model of particle physics and general relativity. This symmetry guarantees that physical phenomena are observed to be...
View ArticleAstrophysical Neutrinos and Cosmic Rays Observed by IceCube
The core mission of the IceCube neutrino observatory is to study the origin and propagation of cosmic rays. IceCube, with its surface component IceTop, observes multiple signatures to accomplish this...
View ArticleNeutrino Emission from the Direction of the Blazar TXS 0506+056 Prior to the...
A high-energy neutrino event detected by IceCube on 22 September 2017 was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056. Prompted by this association, we...
View ArticleObservation of the 1S–2P Lyman-α Transition in Antihydrogen
In 1906, Theodore Lyman discovered his eponymous series of transitions in the extreme-ultraviolet region of the atomic hydrogen spectrum. The patterns in the hydrogen spectrum helped to establish the...
View ArticleCosmic Ray Composition from the 40-string IceCube/IceTop Detectors
The IceCube Observatory at the South Pole is composed of a deep detector and a surface detector, IceTop, both of which use Cherenkov light to detect charged particles. Cosmic ray air showers contain...
View ArticleSensing Optical Cavity Mismatch with a Mode-converter and Quadrant Photodiode
We present a new technique for sensing optical cavity mode mismatch and alignment by using a cylindrical lens mode converting telescope, radio-frequency quadrant photodiodes, and a heterodyne...
View ArticleLaser Cooling of Antihydrogen Atoms
The photon—the quantum excitation of the electromagnetic field—is massless but carries momentum. A photon can therefore exert a force on an object upon collision1. Slowing the translational motion of...
View ArticleExamination of the Catalytic Role of the Axial Cystine Ligand in the Co-Type...
The strictly conserved αSer162 residue in the Co-type nitrile hydratase from Pseudonocardia thermophila JCM 3095 (PtNHase), which forms a hydrogen bond to the axial αCys108-S atom, was mutated into an...
View ArticleIdentification of an Intermediate Species along the Nitrile Hydratase...
A new method to trap catalytic intermediate species was employed with Fe-type nitrile hydratase from Rhodococcus equi TG328-2 (ReNHase). ReNHase was incubated with substrates in a 23% (w/w) NaCl/H2O...
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