A5044241762- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Superconducting and THz Device Technology
- Quantum, superfluid, helium dynamics
- Quantum and electron transport phenomena
- Astrophysics and Cosmic Phenomena
- Luminescence Properties of Advanced Materials
- Physics of Superconductivity and Magnetism
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Scientific Research and Discoveries
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Semiconductor Detectors and Materials
- Electromagnetic Compatibility and Measurements
- Fractal and DNA sequence analysis
- Advanced Data Storage Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Random lasers and scattering media
- Radio Astronomy Observations and Technology
- Electron and X-Ray Spectroscopy Techniques
High Energy Accelerator Research Organization
2024-2025
International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles
2024-2025
University of California, Berkeley
2021-2024
Lawrence Berkeley National Laboratory
2021-2024
University of Edinburgh
2024
Princeton University
2015-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2019
Imperial College London
2018
Abstract The performance of superconducting qubits is degraded by a poorly characterized set energy sources breaking the Cooper pairs responsible for superconductivity, creating condition often called “quasiparticle poisoning”. Both and low threshold dark matter calorimeters have observed excess bursts quasiparticles or phonons that decrease in rate with time. Here, we show silicon crystal glued to its holder exhibits low-energy phonon events more than two orders magnitude larger...
The dark matter interpretation of the DAMA modulation signal depends on NaI(Tl) scintillation efficiency nuclear recoils. Previous measurements for Na recoils have large discrepancies, especially in DAMA/LIBRA energy region. We report a quenching effect measurement from 3 to $52 {\mathrm{keV}}_{\text{nr}}$, covering whole region matter-Na scattering interpretations. By using low-energy, pulsed neutron beam, double time-of-flight technique, and pulse-shape discrimination methods, we obtained...
SABRE aims to directly measure the annual modulation of dark matter interaction rate with NaI(Tl) crystals. A compatible standard hypothesis in which our Galaxy is embedded a halo has been measured by DAMA experiment same target material. Other direct detection experiments, using different materials, seem exclude interpretation such simplest scenario WIMP-nucleon elastic scattering. The carry out an independent search sufficient sensitivity confirm or refute claim. concept and goal obtain...
The SPICE/HeRALD collaboration is performing research and development to enable studies of sub-GeV dark matter models using a variety target materials. Here we report our recent progress on instrumenting superfluid He4 mass with transition-edge sensor based calorimeter detect both atomic signals (scintillation) quasiparticle (phonon roton) excitations. sensitivity HeRALD the critical "quantum evaporation" signal from quasiparticles requires us block film flow calorimeter. We have developed...
Ultra-pure NaI(Tl) crystals are the key element for a model-independent verification of long standing DAMA result and powerful means to search annual modulation signature dark matter interactions. The SABRE collaboration has been developing cutting-edge techniques reduction intrinsic backgrounds over several years. In this paper we report first characterization 3.4 kg crystal, named NaI-33, performed in an underground passive shielding setup at LNGS. NaI-33 record low $^{39}$K contamination...
The annual modulation of scintillation event rate observed by the DAMA/LIBRA experiment has been a long-standing controversy in quest direct detection dark matter. effort to definitively confirm or refute turned out be challenging due lack NaI(Tl) crystals with high enough radio-purity. Most recently, we successfully grew 6-kg ingot free from contamination during growth, which 3.4-kg crystal scintillator was made. $^{39}$K concentration final is estimated 4.3$\pm$0.2~ppb, unprecedented for...
We describe observations of low energy excess (LEE) events, background events observed in all light dark matter direct detection calorimeters, and noise a transition edge sensor based two-channel silicon athermal phonon detector with 375 meV baseline resolution. measure two distinct LEE populations: “shared” multichannel pulse shape consistent substrate sub-eV that couple nearly exclusively to single channel significantly faster shape. These “singles” are occurring within the aluminum...
Abstract In this technical design report (TDR) executive summary we describe the SABRE South detector to be built at Stawell Underground Physics Laboratory (SUPL). The is designed test long-standing DAMA/LIBRA signal of an annually modulating rate consistent with dark matter by using same target material. Located in Southern Hemisphere, uniquely positioned disentangle seasonal effects. uses seven ultra-high purity NaI(Tl) crystals (with a total mass either 35 kg or 50 kg), hermetically...
We present new results on the radiopurity of a 3.4-kg NaI(Tl) crystal scintillator operated in SABRE proof-of-principle detector setup. The amount potassium contamination, determined by direct counting radioactive $^{40}$K, is found to be $2.2\pm1.5$ ppb, lowest ever achieved for crystals. With active veto, average background rate 1-6 keV energy region-of-interest (ROI) $1.20\pm0.05$ counts/day/kg/keV, which breakthrough since DAMA/LIBRA experiment. Our model indicates that dominated...
Superfluid $^{4}\mathrm{He}$ is a promising target material for direct detection of light ($<1\text{ }\text{ }\mathrm{GeV}$) dark matter. Possible signal channels available readout in this medium include prompt photons, triplet excimers, and roton phonon quasiparticles. The relative yield these signals has implications the sensitivity discrimination power superfluid matter detector. Using $16\text{ }{\mathrm{cm}}^{3}$ volume 1.75 K read out by six immersed photomultiplier tubes, we measured...
The performance of superconducting qubits is degraded by a poorly characterized set energy sources breaking the Cooper pairs responsible for superconductivity, creating condition often called ``quasiparticle poisoning". Both and low threshold dark matter calorimeters have observed excess bursts quasiparticles or phonons that decrease in rate with time. Here, we show silicon crystal glued to its holder exhibits low-energy phonon events more than two orders magnitude larger functionally...
We propose the first event-by-event directional antineutrino detector using inverse beta decay (IBD) interactions on hydrogen, with potential applications including monitoring for nuclear nonproliferation, spatially mapping geoneutrinos, characterizing diffuse supernova neutrino background and searching new physics in sector. The consists of adjacent separated target capture scintillator planes. IBD events take place layers, which are thin enough to allow neutrons escape without scattering...
The dark matter claim by DAMA is both significant and controversial. Several experiments have claimed to rule out DAMA/LIBRA, but the comparisons are made based on halo matter-interaction models that currently unknown. Therefore, an unambiguous test of DAMA/LIBRA best using NaI(Tl) crystals with lower residual background than SABRE experiment designed achieve this goal. In paper we will discuss development high-purity detectors, progress toward testing DAMA/LIBRA.
The persistence of the DAMA/LIBRA (DAMA) modulation over past two decades has been a source great contention within dark matter community. DAMA collaboration reports persistent, modulating event rate their setup NaI(Tl) scintillating crystals at INFN Laboratori Nazionali del Gran Sasso (LNGS) underground laboratory. A recent work alluded that this signal could have arisen due to an analysis artefact, caused by not accounting for time variation decaying background radioisotopes in procedure....
There has been a growing interest in ultrahigh-purity low-background $\mathrm{Na}\mathrm{I}$($\mathrm{Tl}$) crystals for dark-matter direct searches. Past research indicates that zone refining is an efficient and scalable way to purify $\mathrm{Na}\mathrm{I}$. In particular, $\mathrm{K}$ $\mathrm{Rb}$---two elements with radioisotopes can cause scintillation backgrounds---can be efficiently removed by refining. However, never demonstrated $\mathrm{Na}\mathrm{I}$, which become commercially...
Abstract We present here a characterization of the low background NaI(Tl) crystal NaI-33 based on period almost one year data taking (891 kg $$\times $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>×</mml:mo> </mml:math> days exposure) in detector configuration with no use organic scintillator veto. This remarkably radio-pure already showed SABRE Proof-of-Principle (PoP) detector, energy region interest (1–6 keV) for search dark matter interaction via annual modulation...
Data acquisition (DAQ) plays a key role in most, if not all, experimental sciences. However, developing DAQ software is difficult and time-consuming. Polaris general-purpose, modular, open-source framework written C++ that can meet wide range of requirements, from laboratory measurements to mid-scale nuclear particle physics experiments. This achieved by decoupling application-specific requirements common features software. article focuses on the design philosophy describes real-world...
X-ray computed tomography (CT) has an indispensable role in constructing 3D images of objects made from light materials. However, limited by absorption coefficients, X-rays cannot deeply penetrate materials such as copper and lead. Here we show via simulation that muon beams can provide high resolution tomographic dense structures within the interior objects. The effects broadening multiple scattering diminish with increasing momentum. As momentum increases, contrast image goes down...
We describe observations of low energy excess (LEE) events (background observed in all light dark matter direct detection calorimeters) and noise a two-channel silicon athermal phonon detector with 375 meV baseline resolution. measure two distinct LEE populations: ``shared'' multichannel pulse shape consistent events, sub-eV which couple nearly exclusively to single channel significantly faster shape. These ``singles'' are occurring within the aluminum collection fins. Similarly, our...
In this Technical Design Report (TDR) we describe the SABRE South detector to be built at Stawell Underground Physics Laboratory (SUPL). The is designed test long-standing DAMA/LIBRA signal of an annually modulating rate consistent with dark matter by using same target material. uses seven ultra-high purity NaI(Tl) crystals (with a total mass either 35 kg or 50 kg), hermetically sealed in copper enclosures that are suspended within liquid scintillator active veto. High quantum efficiency and...
The dark matter interpretation of the DAMA/LIBRA annual modulation signal represents a long-standing open question in astroparticle physics. SABRE experiment aims to test such claim, bringing same detection technique an unprecedented sensitivity. Based on ultra-low background NaI(Tl) scintillating crystals like DAMA, features liquid scintillator Veto system, surrounding main target, and it will deploy twin detectors: one Northern hemisphere at Laboratori Nazionali del Gran Sasso (LNGS),...