We report results from searches for new physics with low-energy electronic recoil data recorded with the XENON1T detector. With an exposure of 0.65 tonne-years and an unprecedentedly low background rate of 76±2stat  events/(tonne×year×keV) between 1 and 30 keV, the data enable one of the most sensitive searches for solar axions, an enhanced neutrino magnetic moment using solar neutrinos, and bosonic dark matter. An excess over known backgrounds is observed at low energies and most prominent between 2 and 3 keV. 
The solar axion model has a 3.4σ significance, and a three-dimensional 90% confidence surface is reported for axion couplings to electrons, photons, and nucleons. This surface is inscribed in the cuboid defined by gae<3.8×10-12, gaeganeff<4.8×10-18, and gaegaγ<7.7×10-22  GeV-1, and excludes either gae=0 or gaegaγ=gaeganeff=0. The neutrino magnetic moment signal is similarly favored over background at 3.2σ, and a confidence interval of μν∈(1.4,2.9)×10-11  μB (90% C.L.) is reported. Both results are in strong tension with stellar constraints. The excess can also be explained by β decays of tritium at 3.2σ significance with a corresponding tritium concentration in xenon of (6.2±2.0)×10-25  mol/mol. Such a trace amount can neither be confirmed nor excluded with current knowledge of its production and reduction mechanisms. The significances of the solar axion and neutrino magnetic moment hypotheses are decreased to 2.0σ and 0.9σ, respectively, if an unconstrained tritium component is included in the fitting. With respect to bosonic dark matter, the excess favors a monoenergetic peak at (2.3±0.2)  keV (68% C.L.) with a 3.0σ global (4.0σ local) significance over background. 
This analysis sets the most restrictive direct constraints to date on pseudoscalar and vector bosonic dark matter for most masses between 1 and 210  keV/c2. We also consider the possibility that Ar37 may be present in the detector, yielding a 2.82 keV peak from electron capture. Contrary to tritium, the Ar37 concentration can be tightly constrained and is found to be negligible.

/pdf/excess-electronic-recoil-events-in-xenon1t-57gg2l9ano.pdf

Excess electronic recoil events in XENON1T

The fault activation (fault on) interrupts the enduring fault locking (fault off) and marks the end of a seismic cycle in which the brittle-ductile transition (BDT) acts as a sort of switch. We suggest that the fluid flow rates differ during the different periods of the seismic cycle (interseismic, pre-seismic, coseismic and post-seismic) and in particular as a function of the tectonic style. Regional examples indicate that tectonic-related fluids anomalies depend on the stage of the tectonic cycle and the tectonic style. Although it is difficult to model an increasing permeability with depth and several BDT transitions plus independent acquicludes may occur in the crust, we devised the simplest numerical model of a fault constantly shearing in the ductile deeper crust while being locked in the brittle shallow layer, with variable homogeneous permeabilities. The results indicate different behaviors in the three main tectonic settings. In tensional tectonics, a stretched band antithetic to the normal fault forms above the BDT during the interseismic period. Fractures close and fluids are expelled during the coseismic stage. The mechanism reverses in compressional tectonics. During the interseismic stage, an over-compressed band forms above the BDT. The band dilates while rebounding in the coseismic stage and attracts fluids locally. At the tip lines along strike-slip faults, two couples of subvertical bands show different behavior, one in dilation/compression and one in compression/dilation. This deformation pattern inverts during the coseismic stage. Sometimes a pre-seismic stage in which fluids start moving may be observed and could potentially become a precursor.

Fault on-off versus coseismic fluids reaction

Due to the subcrustal earthquakes located at the sharp bend of the Southeast Carpathians, Vrancea zone in Romania has a high potential seismic hazard in Europe. Among several seismic precursors, radon anomalies in air, ground, and groundwater in the epicentral areas can be associated with the strain stress changes that occurred before and after earthquakes. In order to support this theoretical view, the main aim of this paper was to investigate temporal variations of radon concentration levels in air near the ground and in ground air by the use of solid state nuclear track detectors CR-39 and LR-115 in relation with some seismic events at two seismic stations Vrancioaia and Plostina, located in Vrancea active region. This paper reports essentially the observation of radon concentration levels in the air near the ground at 1 m height for the earthquakes that occurred during the period of November 2010–October 2011 and moment magnitudes Mw in the range of \( 2.0 \le M_{\text{w}} \le 4.9 \). The average radon concentration in air above the ground measured with CR-39 detectors recorded for 1 year period in Vrancea area was 1,094.58 ± 150.3 Bq/m3 and 10 days fluctuations were placed in the range of 129 ± 40 Bq/m3 and 5,888 ± 700 Bq/m3. Also have been reported measurements of in soil radon concentrations in drill holes at 0.5 m depths during period of March 1977–October 1980, just after 4 March 1977, Mw 7.4 Vrancea earthquake. The knowledge of air–ground–gas 222Rn anomalies is very important for earthquake pre-signals assessment as well as for precisely location of geologic active faults.

Radon levels assessment in relation with seismic events in Vrancea region

We construct the first comprehensive radioactive background model for a dark matter search with charge-coupled devices (CCDs). We leverage the well-characterized depth and energy resolution of the DAMIC at SNOLAB detector and a detailed geant4-based particle-transport simulation to model both bulk and surface backgrounds from natural radioactivity down to 50 eVee. We fit to the energy and depth distributions of the observed ionization events to differentiate and constrain possible background sources, for example, bulk H3 from silicon cosmogenic activation and surface Pb210 from radon plate-out. We observe the bulk background rate of the DAMIC at SNOLAB CCDs to be as low as 3.1±0.6 counts kg−1 day−1 keVee−1, making it the most sensitive silicon dark matter detector. Finally, we discuss the properties of a statistically significant excess of events over the background model with energies below 200 eVee.12 MoreReceived 29 October 2021Accepted 22 February 2022DOI:https://doi.org/10.1103/PhysRevD.105.062003Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasCosmic rays & astroparticlesDark matterParticle dark matterPhysical SystemsHypothetical particlesWeakly interacting massive particlesTechniquesCosmic ray & astroparticle detectorsDark matter detectorsSolid-state detectorsParticles & FieldsGravitation, Cosmology & Astrophysics 

/pdf/characterization-of-the-background-spectrum-in-damic-at-3f1myv7m.pdf

Characterization of the background spectrum in DAMIC at SNOLAB

Uranium groundwater anomalies, which were observed in cataclastic rocks crossing the underground Gran Sasso National Laboratory before the L’Aquila earthquake (April 6th, 2009), have been studied versus radium and tritium contents. The radionuclide analysis supports the role of endogenic fluid dynamics for uranium content in groundwater rather than percolation processes, due to meteoric events occurring above the water table of the Gran Sasso aquifer. The uranium anomalies represent a key geochemical signal of a progressive increase of deep fluids fluxes at middle-lower crustal levels associated with the geodynamics of the earthquake. Moreover, the uranium represents a more precise strain-meter than radon as its presence can be modulated during the preparation phase of the earthquake, and only successively released by microfracturing during the main shock and aftershocks.

Uranium, radium and tritium groundwater monitoring at INFN-Gran Sasso National Laboratory, Italy

The ability to predict earthquakes is one of the greatest challenges for Earth Sciences. Radon has been suggested as one possible precursor, and its groundwater anomalies associated with earthquakes and water–rock interactions were proposed in several seismogenic areas worldwide as due to possible transport of radon through microfractures, or due to crustal gas fluxes along active faults. However, the use of radon as a possible earthquake’s precursor is not clearly linked to crustal deformation. It is shown in this paper that uranium groundwater anomalies, which were observed in cataclastic rocks crossing the underground Gran Sasso National Laboratory, can be used as a possible strain meter in domains where continental lithosphere is subducted. Measurements evidence clear, sharp anomalies from July, 2008 to the end of March, 2009, related to a preparation phase of the seismic swarm, which occurred near L’Aquila, Italy, from October, 2008 to April, 2009. On April 6th, 2009 an earthquake (Mw = 6.3) occurred at 01:33 UT in the same area, with normal faulting on a NW–SE oriented structure about 15 km long, dipping toward SW. In the framework of the geophysical and geochemical models of the area, these measurements indicate that uranium may be used as a possible strain meter in extensional tectonic settings similar to those where the L’Aquila earthquake occurred.

/pdf/uranium-groundwater-anomalies-and-active-normal-faulting-3qrw0wlyqe.pdf

Uranium groundwater anomalies and active normal faulting

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Uranium groundwater anomalies and active normal faulting