Kai Loo
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View article: Evidence for Anomalies in Muon-Induced Neutron Emissions from Pb
Evidence for Anomalies in Muon-Induced Neutron Emissions from Pb Open
This paper examines neutron multiplicity spectra emitted from massive targets at depths of 3, 40, 210, 583, 1166, and 4000 m.w.e. The measurements, carried out between 2001 and 2024, used three experimental setups with either 14 or 60 He-3…
View article: Systematic Construction of Interfaces and Anomalous Boundaries for Fermionic Symmetry-Protected Topological Phases
Systematic Construction of Interfaces and Anomalous Boundaries for Fermionic Symmetry-Protected Topological Phases Open
We use the pullback trivialization technique to systematically construct gapped interfaces and anomalous boundaries for fermionic symmetry-protected topological (FSPT) states by extending their symmetry group $G_f = \mathbb{Z}_2^f \times_{…
View article: New Evidence for DM-like Anomalies in neutron multiplicity spectra
New Evidence for DM-like Anomalies in neutron multiplicity spectra Open
Subterrestrial neutron spectra show weak but consistent anomalies at multiplicities ~100 and above. The origin of the excess events remains ambiguous, but, in principle, it could be a signature of Dark Matter WIMP annihilation-like interac…
View article: Upgrade of OSIRIS for Future Liquid Scintillator Studies
Upgrade of OSIRIS for Future Liquid Scintillator Studies Open
Understanding the internal radioactive background contributions in its 20 kiloton liquid scintillator (LS) target is essential for the success of the JUNO reactor neutrino experiment. OSIRIS is a 20-tonne radiopurity detector at the end of…
View article: New Evidence for DM-like Anomalies in Neutron Multiplicity Spectra
New Evidence for DM-like Anomalies in Neutron Multiplicity Spectra Open
Subterrestrial neutron spectra show weak but consistent anomalies at multiplicities ~100 and above. The origin of the excess events remains ambiguous, but, in principle, it could be a signature of Dark Matter WIMP annihilation-like interac…
View article: Muography and Geology: Does It Matter Which Continent YouStand on?
Muography and Geology: Does It Matter Which Continent YouStand on? Open
The present work has one aim and one aim only: to increase the geological credibility of simulations of muon propagation in real-world rocks.We accomplish this by introducing five different sets of real-world geological systems.Our approac…
View article: DM-like anomalies in neutron multiplicity spectra
DM-like anomalies in neutron multiplicity spectra Open
A new experiment collects data, since November 2019, at a depth of 210 m.w.e. in the Callio Lab in the Pyhasalmi mine in Finland. The setup, called NEMESIS (New Emma MEasurementS Including neutronS), incorporates infrastructure from the EM…
View article: Performance study of a 3×1×1 m<sup>3</sup> dual phase liquid Argon Time Projection Chamber exposed to cosmic rays
Performance study of a 3×1×1 m<sup>3</sup> dual phase liquid Argon Time Projection Chamber exposed to cosmic rays Open
We report the results of the analyses of the cosmic ray data collected with a 4 tonne (3×1×1 m 3 ) active mass (volume) Liquid Argon Time-Projection Chamber (TPC) operated in a dual-phase mode. We present a detailed study of the TPC's resp…
View article: New NEMESIS Results
New NEMESIS Results Open
Funding Information: This work has been supported in part by the EU INTERREG for the Baltic Sea programme within the BSUIN project, and by the Polish Ministry of Science and Higher Education (Grant no. Funding Information: This work has be…
View article: High-multiplicity neutron events registered by NEMESIS experiment
High-multiplicity neutron events registered by NEMESIS experiment Open
Neutron-induced interactions contribute to the signal-mimicking background in deep-underground searches for exotic phenomena such as Dark Matter, neutrino-less double beta decay, proton decay, etc. Apart from radioactive decay, the primary…
View article: Study of scintillation light collection, production and propagation in a 4 tonne dual-phase LArTPC
Study of scintillation light collection, production and propagation in a 4 tonne dual-phase LArTPC Open
The 3×1×1 m3 demonstrator is a dual phase liquid argon time projection chamber that has recorded cosmic rays events in 2017 at CERN. The light signal in these detectors is crucial to provide precise timing capabilities. The performance of …
View article: Underground investigation of extensive air showers spectra at high energy range of cosmic rays and other research in the Pyhäsalmi mine
Underground investigation of extensive air showers spectra at high energy range of cosmic rays and other research in the Pyhäsalmi mine Open
High energy particles reaching the Earth’s atmosphere are known as cosmic rays. As a result of interactions with nuclei of air molecules, cosmic rays induce showers of secondary particles, which can be divided into 3 components: electromag…
View article: High-multiplicity muon events observed with EMMA array
High-multiplicity muon events observed with EMMA array Open
High-multiplicity data, collected with a segmented scintillator array of the cosmic-ray experiment EMMA (Experiment with Multi-Muon Array), is presented for the first time. The measurements were done at the depth of 75 meters (210 m.w.e.) …
View article: Acoustic detection of neutrinos in bedrock
Acoustic detection of neutrinos in bedrock Open
We propose to utilize bedrock as a medium for acoustic detection of particle showers following interactions of ultra-high energy neutrinos. With the density of rock three-times larger and the speed of sound four-times larger compared to wa…
View article: A 4 tonne demonstrator for large-scale dual-phase liquid argon time projection chambers
A 4 tonne demonstrator for large-scale dual-phase liquid argon time projection chambers Open
A 10 kilo-tonne dual-phase liquid argon TPC is one of the detector options considered for the Deep Underground Neutrino Experiment (DUNE). The detector technology relies on amplification of the ionisation charge in ultra-pure argon vapour …
View article: Possibilities for Underground Physics in the Pyhäsalmi mine
Possibilities for Underground Physics in the Pyhäsalmi mine Open
The Pyhäsalmi mine is uniquely suited to host new generation of large-scale underground experiments. It was chosen both by the LAGUNA-LBNO and by the LENA Collaboration as the preferred site for a giant neutrino observatory. Regrettably, n…
View article: Calculation of total muon flux observed by Muon Monitor experiment
Calculation of total muon flux observed by Muon Monitor experiment Open
An approach to calculate the flux of cosmicgenic muons detected by Muon Monitor experiment in lab LAB2400 of the Underground Laboratory in Canfranc (LSC) is described. The measuring apparatus consists of three layers of SC16 scintillation …
View article: Omnibus experiment: CPT and CP violation with sterile neutrinos
Omnibus experiment: CPT and CP violation with sterile neutrinos Open
The verification of the sterile neutrino hypothesis and, if confirmed, the determination of the relevant oscillation parameters is one of the goals of the neutrino physics in near future. We propose to search for the sterile neutrinos with…
View article: Towards <sup>14</sup>C-free liquid scintillator
Towards <sup>14</sup>C-free liquid scintillator Open
A series of measurements has been started where the 14C concentration is determined from several liquid scintillator samples. A dedicated setup has been designed and constructed with the aim of measuring concentrations smaller than 10−18. …
View article: A New Low Background Laboratory in the Pyhäsalmi Mine: Towards 14C free liquid scintillator for low energy neutrino experiments
A New Low Background Laboratory in the Pyhäsalmi Mine: Towards 14C free liquid scintillator for low energy neutrino experiments Open
A new low background laboratory in Pyhäsalmi mine in the Central Finland has been put into operation in the beginning of 2017. The laboratory operates at the depth of 1436 m (~4100 meters of water equivalent). In this paper we present desc…
View article: Muon multiplicities measured using an underground cosmic-ray array
Muon multiplicities measured using an underground cosmic-ray array Open
EMMA (Experiment with Multi-Muon Array) is an underground detector array designed for cosmic-ray composition studies around the knee energy (or ∼ 1 − 10 PeV). It operates at the shallow depth in the Pyh¨asalmi mine, Finland. The array cons…
View article: Omnibus experiment: CPT and CP violation with sterile neutrinos
Omnibus experiment: CPT and CP violation with sterile neutrinos Open
We propose to probe both the CPT and CP violation together with the search for sterile neutrinos in one do-it-all experiment. This omnibus experiment would utilize neutrino oscillometry with large scintillator detectors like LENA, JUNO or …
View article: Measuring the<sup>14</sup>C content in liquid scintillators
Measuring the<sup>14</sup>C content in liquid scintillators Open
We are going to perform a series of measurements where the 14C/12C ratio will be measured from several liquid scintillator samples with a dedicated setup. The setup is designed with the aim of measuring ratios smaller than 10−18. Measureme…
View article: Extending physics potential of large liquid scintillator neutrino detectors
Extending physics potential of large liquid scintillator neutrino detectors Open
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