The Borexino experiment, located in the Laboratori Nazionali del Gran Sasso in Italy and widely known for its rich Solar Neutrino physics program, has recently celebrated the 10 years of data taking. ...Among the achievements of the Borexino experiment solar program are: a precision measurement of 7Be neutrino flux with uncertainty of 3%, limit on its day/night asymmetry, first spectral measurement of pp-neutrinos, first evidence of monoenergetic pep neutrinos at 5 sigma, 8B neutrinos detection with the lowest visible energy threshold of 3 MeV, observation of season modulation of the 7Be solar neutrino rate at 3.8 sigma and the best current limit on CNO neutrino flux. Borexino is now in its high-purity Phase II data taking, thanks to intense purification campaigns of scintillator in 2010-11 that were very successful in further reducing the already low backgrounds. The advanced tecniques of data analysis were improved, allowing to maximize the signal/noise ratio. The detector was thermally insulated in order to improve the fluid stability. As an outcome, quality of the data has significantly increased leading to new levels of sensitivity to all solar neutrino fluxes. This allows a more sensitive probe for CNO neutrinos relevant to the solar metallicity problem.
We have studied thin-film superconductor - semiconductor (with quantum dots)-superconductor MoRe-Si(W)-MoRe junctions, where electrons are tunneling through a single or several quantum dots within ...the Si(W) barrier. Current-voltage characteristics (CVCs) of the samples have been measured in a wide voltage range from -900 to 900 mV at temperatures from 4.2 to 8 K. At relatively high tungsten content in the barrier, we have observed emergence of the Josephson effect. Characteristic voltages I c R N , the product of the critical Josephson supercurrent I c and the normal-state resistance R N , of the samples were unusually high. Simultaneously, we have observed large excess quasiparticle currents Iexc in the dissipative part of CVCs, which is a strong evidence of intensive electron-to-hole Andreev reflections in the junctions studied. When the W content in the barrier was decreased, the Josephson current disappeared, and we have observed resonant current peaks in the CVCs at bias voltages from 40 to 300 mV, which were symmetrical for positive and negative voltages. In the studied heterostructures, metal clusters inside the barrier behave as quasi-one-dimensional quantum dots; hence, the charge transport can be adequately described by scattering matrices within the quantum model of one-dimensional charge transport.
Aim
To evaluate outcomes in patients with acute coronary syndrome and atrial fibrillation who receive rivaroxaban and the patients’ compliance with the antithrombotic therapy.
Material and ...methods
The study was performed from October 2017 through December 2019 and included 129 patients. Events between the discharge from the hospital and 12 months of follow-up were recorded. The primary endpoint was development of major, minor or requiring medical attention bleeding according to the TIMI scale. The secondary endpoint was a combination of recurrent myocardial infarction, nonfatal acute ischemic cerebrovascular disease, nonfatal systemic embolism, stent thrombosis, and cardiovascular mortality.
Results
32 (24.8%) patients early terminated the antiplatelet treatment and 22 (17.1%) patients terminated the rivaroxaban treatment. 26 (20.2 %) patients had hemorrhagic complications. The highest incidence of hemorrhage was observed within the first 2 months after the discharge. None of the bleedings was fatal. Composite endpoint events were observed in 24 (18.6 %) patients, including 14 (10.9 %) who died from cardiovascular causes.
Conclusion
The compliance with the antiplatelet therapy was insufficient. The incidence of hemorrhagic complications was relatively high; minor and requiring medical attention hemorrhages mostly contributed to the structure of these complications. The observed incidence of recurrent ischemic events associated with a high mortality presents a more serious problem compared to hemorrhagic complications of the combination antiplatelet therapy and warrants a more aggressive tactics of the antiplatelet treatment in high-risk patients.
We present the evidence for the seasonal modulation of the 7Be neutrino interaction rate with the Borexino detector at the Laboratori Nazionali del Gran Sasso in Italy. The period, amplitude, and ...phase of the observed time evolution of the signal are consistent with its solar origin, and the absence of an annual modulation is rejected at 99.99% C.L. The data are analyzed using three methods: the analytical fit to event rate, the Lomb-Scargle and the Empirical Mode Decomposition techniques, which all yield results in excellent agreement.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
Pulse-shape discrimination with the Counting Test Facility Back, H.O.; Balata, M.; Bellini, G. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2008, 2008-1-00, 2008-01, Volume:
584, Issue:
1
Journal Article
Peer reviewed
Open access
Pulse shape discrimination (PSD) is one of the most distinctive features of liquid scintillators. Since the introduction of the scintillation technique in the field of particle detection, many ...studies have been carried out to characterize intrinsic properties of the most common liquid scintillator mixtures in this respect. Several application methods and algorithms capable of achieving optimum discrimination performances have been developed. However, the vast majority of these studies have been performed on samples of small dimensions. The Counting Test Facility, prototype of the solar neutrino experiment Borexino, as a 4 ton spherical scintillation detector immersed in 1000 tons of shielding water, represents a unique opportunity to extend the small-sample PSD studies to a large-volume set-up. Specifically, in this work we consider two different liquid scintillation mixtures employed in CTF, illustrating for both the PSD characterization results obtained either with the processing of the scintillation waveform through the optimum Gatti's method, or via a more conventional discrimination approach based on the charge content of the scintillation tail. The outcomes of this study, while interesting per se, are also of paramount importance in view of the expected Borexino detector performances, where PSD will be an essential tool in the framework of the background rejection strategy needed to achieve the required sensitivity to the solar neutrino signals.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Neutrino produced in a chain of nuclear reactions in the Sun starting from the fusion of two protons, for the first time has been detected in a real-time detector in spectrometric mode. The unique ...properties of the Borexino detector provided an oppurtunity to disentangle pp-neutrino spectrum from the background components. A comparison of the total neutrino flux from the Sun with Solar luminosity in photons provides a test of the stability of the Sun on the 10
5
years time scale, and sets a strong limit on the power production in the unknown energy sources in the Sun of no more than 4% of the total energy production at 90% C.L.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
A first walk on the DarkSide Davini, S.; Agnes, P.; Alexander, T. ...
Nuclear and particle physics proceedings,
04/2016, Volume:
273-275, Issue:
C
Journal Article
Peer reviewed
Open access
DarkSide-50 (DS-50) at Gran Sasso underground laboratory (LNGS), Italy, is a direct dark matter search experiment based on a TPC with liquid argon. DS-50 has completed its first dark matter run using ...atmospheric argon as target. The DS-50 detector performances and the results of the first physics run are reviewed in this proceeding.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Borexino: Recent results and future plans Smirnov, O. Yu; Agostini, M.; Appel, S. ...
Physics of particles and nuclei,
11/2017, Volume:
48, Issue:
6
Journal Article
Peer reviewed
Borexino is continuing to take data and presenting the new results. The most recent Borexino results are discussed and plans for the nearest future are presented.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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