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  • Observation of the boson peak in a two-dimensional material 

    Tømterud, Martin; Eder, Sabrina Daniela; Büchner, Christin; Wondraczek, Lothar; Simonsen, Ingve; Schirmacher, Walter; Manson, Joseph R.; Holst, Bodil (Journal article; Peer reviewed, 2023)
    The boson peak is an excess in the phonon vibrational density of states relative to the Debye model. It has been observed in a wide range of amorphous materials, from inorganic glasses to polymers. Two-dimensional random ...
  • Toward the end-to-end optimization of particle physics instruments with differentiable programming 

    Dorigo, Tommaso; Giammanco, Andrea; Vischia, Pietro; Aehle, Max; Bawaj, Mateusz; Boldyrev, Alexey; de Castro Manzano, Pablo; Derkach, Denis; Donini, Julien; Edelen, Auralee; Fanzago, Federica; Gauger, Nicolas R.; Glaser, Christian; Baydin, Atılım G.; Heinrich, Lukas; Keidel, Ralf; Kieseler, Jan; Krause, Claudius; Lagrange, Maxime; Lamparth, Max; Layer, Lukas; Maier, Gernot; Nardi, Federico; Pettersen, Helge Egil Seime; Ramos, Alberto; Ratnikov, Fedor; Röhrich, Dieter; de Austri, Roberto Ruiz; del Árbol, Pablo Martínez Ruiz; Savchenko, Oleg; Simpson, Nathan; Strong, Giles C.; Taliercio, Angela; Tosi, Mia; Ustyuzhanin, Andrey; Zaraket, Haitham (Journal article; Peer reviewed, 2023)
    The full optimization of the design and operation of instruments whose functioning relies on the interaction of radiation with matter is a super-human task, due to the large dimensionality of the space of possible choices ...
  • Interhemispheric asymmetries of neutral upwelling and ion upflow 

    Lessard, Marc R.; Damsell, Alec; Sadler, F. Brent; Oksavik, Kjellmar; Clausen, Lasse (Journal article; Peer reviewed, 2023)
    This work addresses interhemispheric differences in cusp-related neutral density enhancements. The focus is on enhancements that are driven by Poleward Moving Auroral Forms (PMAF), which provide a repetitive sequence of ...
  • Global ULF Waves Excited by Solar Wind Dynamic Pressure Impulses: 1. Timescales and Geomagnetic Activity Dependence 

    Xie, Zi-Kang; Zong, Q.G.; Ren, Jie; Yue, Chao; Liu, Zhi-Yang; Liu, Jian-Jun; Hu, Ze-Jun; Li, Xing-Yu; Yin, Ze-Fan; Yan, Yun; Li, Li; Gjerløv, Jesper (Journal article; Peer reviewed, 2023)
    Solar wind dynamic pressure pulse is one of the sources of ultra-low frequency (ULF) waves. Based on 1-second resolution magnetic field observations from SuperMAG from 2012 to 2019, we conducted a statistical study on ...
  • 3He spin-echo scattering indicates hindered diffusion of isolated water molecules on graphene-covered Ir(111) 

    Kyrkjebø, Signe; Cassidy, Andrew; Lambrick, Sam; Jardine, Andrew; Holst, Bodil; Hornekær, Liv (Journal article; Peer reviewed, 2023)
    The dynamics of water diffusion on carbon surfaces are of interest in fields as diverse as furthering the use of graphene as an industrial-coating technology and understanding the catalytic role of carbon-based dust grains ...
  • Effect of relative permeability hysteresis on reservoir simulation of underground hydrogen storage in an offshore aquifer 

    Lysyy, Maksim; Fernø, Martin; Ersland, Geir (Journal article; Peer reviewed, 2023)
    Underground hydrogen storage (UHS) in porous media is proposed to balance seasonal fluctuations between demand and supply in an emerging hydrogen economy. Despite increasing focus on the topic worldwide, the understanding ...
  • Library of Simulated Gamma-Ray Glows and Application to Previous Airborne Observations 

    Sarria, David Alexandre Stephan; Østgaard, Nikolai; Marisaldi, Martino; Lehtinen, Nikolai Grigorievich; Mezentsev, Andrey (Journal article; Peer reviewed, 2023)
    Gamma-Ray Glows (GRGs) are high energy radiation originating from thunderclouds, in the MeV energy regime, with typical duration of seconds to minutes, and sources extended over several to tens of square kilometers. GRGs ...
  • A unified picture of medium-induced radiation 

    Isaksen, Johannes Hamre; Takacs, Adam; Tywoniuk, Konrad (Journal article; Peer reviewed, 2023)
    We revisit the picture of jets propagating in the quark-gluon plasma. In addition to vacuum radiation, partons scatter on the medium constituents resulting in induced emissions. Analytical approaches to including these ...
  • Prompt gamma-ray spectroscopy in conjunction with the Monte Carlo Library Least Squares approach: applications to range verification in proton therapy 

    Skjerdal, Kyrre; Kögler, Toni; Lionheart, William; Ytre-Hauge, Kristian Smeland; Meric, Ilker (Journal article; Peer reviewed, 2023)
    Prompt Gamma-ray Spectroscopy (PGS) in conjunction with the Monte Carlo Library Least Squares (MCLLS) approach was investigated for the purposes of range monitoring in proton therapy through Monte Carlo simulations. Prompt ...
  • Probing the Atomic Arrangement of Subsurface Dopants in a Silicon Quantum Device Platform 

    Røst, Håkon; Tosi, Ezequiel; Strand, Frode Sneve; Åsland, Anna Cecilie; Lacovig, Paolo; Lizzit, Silvano; Wells, Justin William (Journal article; Peer reviewed, 2023)
    High-density structures of subsurface phosphorus dopants in silicon continue to garner interest as a silicon-based quantum computer platform; however, a much-needed confirmation of their dopant arrangement has been lacking. ...
  • Do the Throat Auroras Create Polar Cap Patches? 

    Zhang, Duan; Zhang, Qing-He; Oksavik, Kjellmar; Xu, Tong; Xing, Zan-Yang; Lyons, L.R.; Han, De-Sheng; Zhang, Hong-Bo; Ma, Yu-Zhang; Hu, Ze-Jun; Liu, Jian-Jun; Wang, Yong; Wang, Xiang-Yu (Journal article; Peer reviewed, 2023)
    Throat auroras and polar cap patches are common phenomena in the polar ionosphere resulting from magnetosphere-ionosphere coupling. A campaign was organized, with all-sky imagers at Yellow River Station, the European ...
  • Deciphering Spatio-Temporal Variations in the Auroral Ionosphere using Magnetometer Data 

    Walker, Simon James (Doctoral thesis, 2024-03-22)
    Den polare ionosfæren er et dynamisk plasma-miljø dominert av koblingen mellom solvinden og jordens magnetosfære. Nordlyset, plasma-bevegelsen og elektriske strømmer i ionosfæren er skalert og drevet av dagsidekoblingen ...
  • Statistical Temporal Variations in the Auroral Electrojet Estimated With Ground Magnetometers in Fennoscandia 

    Walker, Simon; Laundal, Karl Magnus; Reistad, Jone Peter; Ohma, Anders; Hatch, Spencer Mark (Journal article; Peer reviewed, 2023)
    We present the implementation of an improved technique to coherently model the high-latitude ionospheric equivalent current. Using a fixed selection of 20 ground magnetometers in Fennoscandia, we present a method based on ...
  • Fluorescence intensity and fluorescence lifetime measurements of various carbon dots as a function of pH 

    Szapoczka, Wiktoria Karolina; Truskewycz, Adam Leo; Skodvin, Tore; Holst, Bodil; Thomas, Peter James (Journal article; Peer reviewed, 2023)
    Measurement and monitoring of pH are essential in both the industry and academia. It is therefore important to continue developing novel, low-cost pH sensors that provide increased accuracy over long periods of time. ...
  • Pore-scale spatiotemporal dynamics of microbial-induced calcium carbonate growth and distribution in porous media 

    Liu, Na; Haugen, Malin; Benali, Benyamine; Landa-Marbán, David; Fernø, Martin (Journal article; Peer reviewed, 2023)
    The naturally occurring bio-geochemical microbial-induced calcium carbonate precipitation (MICP) process is an eco-friendly technology for rehabilitating construction materials, reinforcement of soils and sand, heavy metals ...
  • An organ deformation model using Bayesian inference to combine population and patient-specific data 

    Rørtveit, Øyvind Lunde; Hysing, Liv Bolstad; Stordal, Andreas Størksen; Pilskog, Sara Margareta Cecilia (Journal article; Peer reviewed, 2023)
    Objective. Organ deformation models have the potential to improve delivery and reduce toxicity of radiotherapy, but existing data-driven motion models are based on either patient-specific or population data. We propose to ...
  • Minimal sterile neutrino dark matter 

    Bringmann, Torsten; Depta, Paul Frederik; Hufnagel, Marco; Kersten, Jörn; Ruderman, Joshua T.; Schmidt-Hoberg, Kai (Journal article; Peer reviewed, 2023)
    We propose a novel mechanism to generate sterile neutrinos νs in the early Universe, by converting ordinary neutrinos να in scattering processes νsνα→νsνs. After initial production by oscillations, this leads to an exponential ...
  • Efficacy and User Experience of a Novel X-Ray Shield on Operator Radiation Exposure during Cardiac Catheterization: A Randomized Controlled Trial 

    Davidsen, Cedric; Ytre-Hauge, Kristian Smeland; Samnøy, Andreas Tefre; Vikenes, Kjell; Lancellotti, Patrizio; Tuseth, Vegard (Journal article; Peer reviewed, 2023)
    BACKGROUND: Radiation shielding is mandatory during cardiac catheterization, but there is a need to improve efficacy and ease of use. METHODS: The aim of the study was to assess the shielding effect and user feedback ...
  • Kinetic model of resonant nanoantennas in polymer for laser induced fusion 

    Papp, Istvan; Bravina, Larissa; Csete, Mária; Kumari, Archana; Mishustin, Igor N.; Motornenko, Anton; Rácz, Péter; Satarov, Leonid M.; Stöcker, Horst; Strottman, Daniel D:; Szenes, András; Vass, Dávid; Szokol, Ágnes Nagyné; Kámán, Judit; Bonyár, Attila; Biró, Tamás S.; Csernai, László Pál; Kroó, Norbert (Journal article; Peer reviewed, 2023)
    Studies of resilience of light-resonant nanoantennas in vacuum are extended to consider the case of polymer embedding. This modifies the nanoantenna’s lifetime and resonant laser pulse energy absorption. The effective ...

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