M. G. Marino
A5074457076- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Quantum, superfluid, helium dynamics
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- Scientific Research and Discoveries
- Nuclear Physics and Applications
- Graphite, nuclear technology, radiation studies
- Quantum Chromodynamics and Particle Interactions
- Advanced Frequency and Time Standards
- Fuel Cells and Related Materials
- Advanced battery technologies research
- Water Systems and Optimization
- Ionic liquids properties and applications
- Membrane-based Ion Separation Techniques
- Radioactive Decay and Measurement Techniques
- Chemical Synthesis and Reactions
- Nuclear reactor physics and engineering
- Mathematical Approximation and Integration
Delft University of Technology
2024
Technical University of Munich
2010-2022
Excellence Cluster Universe
2012-2022
University of Washington
2007-2018
Max Planck Society
2014
Seattle University
2009-2012
University of Washington Applied Physics Laboratory
2012
University of Stuttgart
2012
University of Auckland
2009-2010
Scientific Applications & Research Associates (United States)
2008
We report on several features in the energy spectrum from an ultralow-noise germanium detector operated deep underground. By implementing a new technique able to reject surface events, number of cosmogenic peaks can be observed for first time. discuss irreducible excess bulklike events below 3 keV ionization energy. These could caused by unknown backgrounds, but also dark matter interactions consistent with DAMA/LIBRA. It is not yet possible determine their origin. Improved constraints are...
Abstract The alkaline stability of 26 different quaternary ammonium groups (QA) is investigated for temperatures up to 160 °C and NaOH concentrations 10 mol L −1 with the aim provide a basis selection functional hydroxide exchange membranes in fuel cells ionic‐liquid cations stable basic conditions. Most QAs exhibit unexpectedly high exception aromatic cations. β‐Protons are found be far less susceptible nucleophilic attack than previously suggested, whereas presence benzyl groups, nearby...
Fifteen months of cumulative CoGeNT data are examined for indications an annual modulation, a predicted signature weakly interacting massive particle (WIMP) interactions. Presently available support the presence modulated component unknown origin, with parameters prima facie compatible galactic halo composed light-mass WIMPs. Unoptimized estimators yield statistical significance modulation ∼2.8σ, limited by short exposure.
We report on a search for neutrinoless double-beta decay of $^{136}$Xe with EXO-200. No signal is observed an exposure 32.5 kg-yr, background ~1.5 x 10^{-3} /(kg yr keV) in the $\pm 1\sigma$ region interest. This sets lower limit half-life $T_{1/2}^{0\nu\beta\beta}$($^{136}$Xe) > 1.6 10$^{25}$ (90% CL), corresponding to effective Majorana masses less than 140-380 meV, depending matrix element calculation.
CoGeNT employs p-type point-contact (PPC) germanium detectors to search for Weakly Interacting Massive Particles (WIMPs). By virtue of its low energy threshold and ability reject surface backgrounds, this type device allows an emphasis on low-mass dark matter candidates (wimp mass about 10 GeV/c2). We report the characteristics PPC detector presently taking data at Soudan Underground Laboratory, elaborating aspects shielding, acquisition, instrumental stability, analysis, background...
The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. Demonstrator comprises 44.1 kg (29.7 enriched ^{76}Ge) split between two modules contained a low background shield at the Sanford Underground Research Facility Lead, South Dakota. Here we present results from data taken during construction, commissioning, and start full operations. We achieve unprecedented energy resolution 2.5 keV FWHM Q_{ββ} very with no...
We report the observation of two-neutrino double-beta decay in Xe-136 with T_1/2 = 2.11 +- 0.04 (stat.) 0.21 (sys.) x 10^21 yr. This second order process, predicted by Standard Model, has been observed for several nuclei but not Xe-136. The rate provides new input to matrix element calculations and search more interesting neutrino-less decay, most sensitive probe existence Majorana particles measurement neutrino mass scale.
We report on an improved measurement of the $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ half-life ${}^{136}$Xe performed by EXO-200. The use a large and homogeneous time-projection chamber allows for precise estimate fiducial mass used measurement, resulting in small systematic uncertainty. also discuss detail data-analysis methods double-$\ensuremath{\beta}$ decay searches with EXO-200, while emphasizing those directly related to present measurement. is found be...
A claim for evidence of dark matter interactions in the DAMA experiment has been recently reinforced. We employ a new type germanium detector to conclusively rule out standard isothermal galactic halo weakly interacting massive particles as explanation annual modulation effect leading claim. Bounds are similarly imposed on suggestion that pseudoscalars might lead effect. describe sensitivity light achievable with our device, particular, next-to-minimal supersymmetric model candidates.
We describe a physics simulation software framework, MaGe, that is based on the Geant4 toolkit. MaGe used to simulate response of ultra-low radioactive background detectors ionizing radiation, specifically Majorana and Gerda neutrinoless double-beta decay experiments. use high-purity germanium search for <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">76</sup> Ge jointly developed between these two collaborations. The framework contains geometry...
EXO-200 is an experiment designed to search for double beta decay of $^{136}$Xe with a single-phase, liquid xenon detector. It uses active mass 110 kg enriched 80.6% in the isotope 136 ultra-low background time projection chamber capable simultaneous detection ionization and scintillation. This paper describes detector particular attention most innovative aspects design that revolve around reduction backgrounds, efficient use expensive isotopically xenon, optimization energy resolution...
We present measurements of time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurement uses a data sample 23x10(6) Upsilon(4S)-->BbarB collected by the BABAR detector at PEP-II asymmetric Factory SLAC. In this sample, we find events which one meson is fully reconstructed eigenstate containing charmonium and flavor other determined from its decay products. amplitude asymmetry, standard model proportional sin2beta, derived time distributions such...
A versatile and portable magnetically shielded room with a field of (700 ± 200) pT within central volume 1 m × gradient less than 300 pT/m, achieved without any external stabilization or compensation, is described. This performance represents more hundredfold improvement the state art for two-layer magnetic shield provides an environment suitable next generation precision experiments in fundamental physics at low energies; particular, searches electric dipole moments systems tests...
Weakly Interacting Massive Particles (WIMPs) are well-established dark matter candidates. WIMP interactions with sensitive detectors expected to display a characteristic annual modulation in rate. We release dataset spanning 3.4 years of operation from low-background germanium detector, designed search for this signature. A previously reported persists, concentrated region the energy spectrum populated by an exponential excess unknown origin. Its phase and period agree phenomenological...
We report results of a new technique to measure the electric dipole moment $^{129}\mathrm{Xe}$ with $^{3}\mathrm{He}$ comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred measurement cell, and transported into magnetically shielded room, where SQUID magnetometers detect free precession in applied magnetic fields. The result from one week campaign 2017 2.5 2018, combined detailed study systematic effects, is...
We present a magnetically shielded environment with damping factor larger than 1 × 106 at the mHz frequency regime and an extremely low field gradient over extended volume. This extraordinary shielding performance represents improvement of state-of-the-art in difficult very low-frequency distortions by more order magnitude. technology enables new generation high-precision measurements fundamental physics metrology, including searches for far beyond reach accelerator-based experiments....
CoGeNT has taken data for over 3 years, with 1136 live days of accumulated as April 23, 2013. We report on the results a maximum likelihood analysis to extract any possible dark matter signal present in collected data. The extraction uses 2-dimensional probability density functions (PDFs) characterize anticipated variations interaction rates given observable nuclear recoil energies during differing periods Earth's annual orbit around Sun. Cosmogenic and primordial radioactivity backgrounds...
An increasing number of measurements in fundamental and applied physics rely on magnetically shielded environments with sub nano-Tesla residual magnetic fields. State the art rooms (MSRs) consist up to seven layers high permeability materials combination highly conductive shields. Proper equilibration is crucial obtain such low fields small gradients any MSR. Here we report a scheme equilibrate MSRs 10 times reduced duration sequence significantly lower field improved homogeneity. For search...
A search for Lorentz- and $CPT$-violating signals in the double beta decay spectrum of $^{136}\mathrm{Xe}$ has been performed using an exposure $100\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{yr}$ with EXO-200 detector. No significant evidence spectral modification due to isotropic Lorentz-violation was found, a two-sided limit $\ensuremath{-}2.65\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}\text{...
EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of $^{136}$Xe. Here we report on various Majoron-emitting modes based 100 kg$\cdot$yr exposure A lower limit $T^{^{136}Xe}_{1/2} >1.2 \cdot 10^{24}$ yr at 90% C.L. the half-life spectral index = 1 Majoron was obtained, corresponding constraint Majoron-neutrino coupling constant $|< g^{M}_{ee} >|<$ (0.8-1.7)$\cdot$10$^{-5}$.
Alpha decays in the EXO-200 detector are used to measure fraction of charged $^{218}\text{Po}$ and $^{214}\text{Bi}$ daughters created from $\ensuremath{\alpha}$ $\ensuremath{\beta}$ decays, respectively. $^{222}\text{Rn} \ensuremath{\alpha}$ liquid xenon (LXe) found produce $^{218}\text{Po}^{+}$ ions $50.3\ifmmode\pm\else\textpm\fi{}3.0%$ time, while remainder atoms neutral. The $^{214}\text{Bi}^{+}$ $^{214}\text{Pb} \ensuremath{\beta}$ LXe is be $76.4\ifmmode\pm\else\textpm\fi{}5.7%$,...