E. W. Hoppe
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View article: Final Results of the Majorana Demonstrator’s Search for Double-Beta Decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ge</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>76</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> to Excited States of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Se</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>76</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>
Final Results of the Majorana Demonstrator’s Search for Double-Beta Decay of to Excited States of Open
Ge
View article: Rare multinucleon decays with the full data sets of the Majorana Demonstrator
Rare multinucleon decays with the full data sets of the Majorana Demonstrator Open
The Majorana Demonstrator was an ultra-low-background experiment designed for neutrinoless double-beta decay ($0νββ$) investigation in $^{76}$Ge. Located at the Sanford Underground Research Facility in Lead, South Dakota, the Demonstrator …
View article: Absorption of Fermionic Dark Matter in the PICO-60 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> Bubble Chamber
Absorption of Fermionic Dark Matter in the PICO-60 Bubble Chamber Open
Fermionic dark matter absorption on nuclear targets via neutral current interactions is explored using a nonrelativistic effective field theory framework. An analysis of data from the PICO-60 C_{3}F_{8} bubble chamber sets leading constrai…
View article: Absorption of Fermionic Dark Matter in the PICO-60 C$_{3}$F$_{8}$ Bubble Chamber
Absorption of Fermionic Dark Matter in the PICO-60 C$_{3}$F$_{8}$ Bubble Chamber Open
Fermionic dark matter absorption on nuclear targets via neutral current interactions is explored using a non-relativistic effective field theory framework. An analysis of data from the PICO-60 C$_{3}$F$_{8}$ bubble chamber sets leading con…
View article: Search for Light Dark Matter with NEWS-G at the Laboratoire Souterrain de Modane Using a Methane Target
Search for Light Dark Matter with NEWS-G at the Laboratoire Souterrain de Modane Using a Methane Target Open
The NEWS-G direct detection experiment uses spherical proportional counters to search for light dark matter candidates. New results from a 10 day physics run with a 135 cm in diameter spherical proportional counter at the Laboratoire Soute…
View article: Ionization yield in a methane-filled spherical proportional counter
Ionization yield in a methane-filled spherical proportional counter Open
Spherical proportional counters (SPCs) are gaseous particle detectors sensitive to single ionization electrons in their target media, with large detector volumes and low background rates. The $\mbox{NEWS-G}$ collaboration employs this tech…
View article: Light dark matter constraints from SuperCDMS HVeV detectors operated underground with an anticoincidence event selection
Light dark matter constraints from SuperCDMS HVeV detectors operated underground with an anticoincidence event selection Open
This article presents constraints on dark-matter-electron interactions obtained from the first underground data-taking campaign with multiple SuperCDMS HVeV detectors operated in the same housing. An exposure of 7.63 g−days is used to set…
View article: The MAJORANA DEMONSTRATOR experiment's construction, commissioning, and performance
The MAJORANA DEMONSTRATOR experiment's construction, commissioning, and performance Open
Background: The MAJORANA DEMONSTRATOR , a modular array of isotopically enriched high-purity germanium (HPGe) detectors, was constructed to demonstrate backgrounds low enough to justify building a tonne-scale experiment to search for the n…
View article: Assay-based background projection for the Majorana Demonstrator using Monte Carlo uncertainty propagation
Assay-based background projection for the Majorana Demonstrator using Monte Carlo uncertainty propagation Open
The background index (BI) is an important quantity to project and calculate the half-life sensitivity of neutrinoless double-β decay (0νββ) experiments. An analysis framework is presented to calculate the BI using the specific activities, …
View article: Supernova electron-neutrino interactions with xenon in the nEXO detector
Supernova electron-neutrino interactions with xenon in the nEXO detector Open
Electron-neutrino charged-current interactions with xenon nuclei were modeled in the nEXO neutrinoless double-β decay detector (∼5 metric ton, 90% Xe
View article: Overcoming photobleaching in imaging of single barium atoms in a solid xenon matrix
Overcoming photobleaching in imaging of single barium atoms in a solid xenon matrix Open
Neutrinoless double beta decay is one of the most sensitive probes for new physics beyond the Standard Model of particle physics. One of the isotopes under investigation is Xe
View article: Assay-based background projection for the Majorana Demonstrator using Monte Carlo uncertainty propagation
Assay-based background projection for the Majorana Demonstrator using Monte Carlo uncertainty propagation Open
The MAJORANA DEMONSTRATOR is a neutrinoless double-beta decay (0νββ) experiment containing ~30 kg of p-type point contact germanium detectors enriched to 88% in 76Ge and ~14 kg of natural germanium detectors. The detectors are h…
View article: Final Results of the MAJORANA DEMONSTRATOR's Search for Double-Beta Decay of $^{76}$Ge to Excited States of $^{76}$Se
Final Results of the MAJORANA DEMONSTRATOR's Search for Double-Beta Decay of $^{76}$Ge to Excited States of $^{76}$Se Open
$^{76}$Ge can $ββ$ decay into three possible excited states of $^{76}$Se, with the emission of two or, if the neutrino is Majorana, zero neutrinos. None of these six transitions have yet been observed. The MAJORANA DEMONSTRATOR was designe…
View article: An assay-based background projection for the MAJORANA DEMONSTRATOR using Monte Carlo Uncertainty Propagation
An assay-based background projection for the MAJORANA DEMONSTRATOR using Monte Carlo Uncertainty Propagation Open
The background index is an important quantity which is used in projecting and calculating the half-life sensitivity of neutrinoless double-beta decay ($0νββ$) experiments. A novel analysis framework is presented to calculate the background…
View article: Search for Light Dark Matter with NEWS-G at the Laboratoire Souterrain de Modane Using a Methane Target
Search for Light Dark Matter with NEWS-G at the Laboratoire Souterrain de Modane Using a Methane Target Open
The NEWS-G direct detection experiment uses spherical proportional counters to search for light dark matter candidates. New results from a 10 day physics run with a $135\,\mathrm{cm}$ in diameter spherical proportional counter at the Labor…
View article: Imaging of single barium atoms in a second matrix site in solid xenon for barium tagging in a $^{136}$Xe double beta decay experiment
Imaging of single barium atoms in a second matrix site in solid xenon for barium tagging in a $^{136}$Xe double beta decay experiment Open
Neutrinoless double beta decay is one of the most sensitive probes for new physics beyond the Standard Model of particle physics. One of the isotopes under investigation is $^{136}$Xe, which would double beta decay into $^{136}$Ba. Detecti…
View article: Interpretable boosted-decision-tree analysis for the Majorana Demonstrator
Interpretable boosted-decision-tree analysis for the Majorana Demonstrator Open
The Majorana Demonstrator is a leading experiment searching for neutrinoless double-beta decay with high purity germanium (HPGe) detectors. Machine learning provides a new way to maximize the amount of information provided by these detecto…
View article: Exotic Dark Matter Search with the Majorana Demonstrator
Exotic Dark Matter Search with the Majorana Demonstrator Open
With excellent energy resolution and ultralow-level radiogenic backgrounds, the high-purity germanium detectors in the MAJORANA DEMONSTRATOR enable searches for several classes of exotic dark matter (DM) models. In this work, we report new…
View article: Charge trapping correction and energy performance of the Majorana Demonstrator
Charge trapping correction and energy performance of the Majorana Demonstrator Open
P-type point contact (PPC) high-purity germanium detectors are an important technology in astroparticle and nuclear physics due to their superb energy resolution, low noise, and pulse shape discrimination capabilities. Analysis of data fro…
View article: Constraints on the Decay of Ta180m
Constraints on the Decay of Ta180m Open
180mTa is a rare nuclear isomer whose decay has never been observed. Its remarkably long lifetime surpasses the half-lives of all other known β and electron capture decays due to the large K-spin differences and small energy differences be…
View article: Final Result of the Majorana Demonstrator's Search for Neutrinoless Double-𝛽 Decay in Ge76
Final Result of the Majorana Demonstrator's Search for Neutrinoless Double-𝛽 Decay in Ge76 Open
The MAJORANA DEMONSTRATOR searched for neutrinoless double-β decay (0νββ) of 76Ge using modular arrays of high-purity Ge detectors operated in vacuum cryostats in a low-background shield. The arrays operated with up to 40.4 kg of detectors…
View article: Search for charge non-conservation and Pauli exclusion principle violation with the Majorana Demonstrator
Search for charge non-conservation and Pauli exclusion principle violation with the Majorana Demonstrator Open
View article: The importance of ion kinetic energy for interference removal in ICP-MS/MS
The importance of ion kinetic energy for interference removal in ICP-MS/MS Open
View article: Exotic Dark Matter Search with the Majorana Demonstrator
Exotic Dark Matter Search with the Majorana Demonstrator Open
With excellent energy resolution and ultralow-level radiogenic backgrounds, the high-purity germanium detectors in the enable searches for several classes of exotic dark matter (DM) models. In this work, we report new experimental limits o…
View article: Exploring light dark matter with the DarkSPHERE spherical proportional counter electroformed underground at the Boulby Underground Laboratory
Exploring light dark matter with the DarkSPHERE spherical proportional counter electroformed underground at the Boulby Underground Laboratory Open
We present the conceptual design and the physics potential of DarkSPHERE, a proposed 3 m in diameter spherical proportional counter electroformed underground at the Boulby Underground Laboratory. This effort builds on the R&D performed and…
View article: Constraints on the Decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ta</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>180</mml:mn><mml:mi>m</mml:mi></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>
Constraints on the Decay of Open
^{180m}Ta is a rare nuclear isomer whose decay has never been observed. Its remarkably long lifetime surpasses the half-lives of all other known β and electron capture decays due to the large K-spin differences and small energy differences…
View article: Development of a hybrid neural network and transfer learning model for optimized ICP-MS/MS operation
Development of a hybrid neural network and transfer learning model for optimized ICP-MS/MS operation Open
Correct function and calibration of instrumentation is a crucial assumption for any scientific experiment. One such instrument, tandem inductively coupled plasma mass spectrometer (ICP-MS/MS), has in-depth calibration settings that range a…
View article: Evaluation of SNOLAB background mitigation procedures through the use of an ICP-MS based dust monitoring methodology
Evaluation of SNOLAB background mitigation procedures through the use of an ICP-MS based dust monitoring methodology Open
View article: Energy calibration of germanium detectors for the Majorana Demonstrator
Energy calibration of germanium detectors for the Majorana Demonstrator Open
The Majorana Demonstrator was a search for neutrinoless double-beta decay (0 νββ ) in the 76 Ge isotope. It was staged at the 4850-foot level of the Sanford Underground Research Facility (SURF) in Lead, SD. The experiment consisted of 58 g…
View article: First Measurement of the Nuclear-Recoil Ionization Yield in Silicon at 100 eV
First Measurement of the Nuclear-Recoil Ionization Yield in Silicon at 100 eV Open
We measured the nuclear-recoil ionization yield in silicon with a cryogenic phonon-sensitive gram-scale detector. Neutrons from a monoenergetic beam scatter off of the silicon nuclei at angles corresponding to energy depositions from 4 keV…