20 research outputs found

    The commissioning of the CUORE experiment: the mini-tower run

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    CUORE is a ton-scale experiment approaching the data taking phase in Gran Sasso National Laboratory. Its primary goal is to search for the neutrinoless double-beta decay in 130Te using 988 crystals of tellurim dioxide. The crystals are operated as bolometers at about 10 mK taking advantage of one of the largest dilution cryostat ever built. Concluded in March 2016, the cryostat commissioning consisted in a sequence of cool down runs each one integrating new parts of the apparatus. The last run was performed with the fully configured cryostat and the thermal load at 4 K reached the impressive mass of about 14 tons. During that run the base temperature of 6.3 mK was reached and maintained for more than 70 days. An array of 8 crystals, called mini-tower, was used to check bolometers operation, readout electronics and DAQ. Results will be presented in terms of cooling power, electronic noise, energy resolution and preliminary background measurements

    Results from the Cuore Experiment

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    The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double beta decay that has been able to reach the 1-ton scale. The detector consists of an array of 988 TeO2 crystals arranged in a cylindrical compact structure of 19 towers, each of them made of 52 crystals. The construction of the experiment was completed in August 2016 and the data taking started in spring 2017 after a period of commissioning and tests. In this work we present the neutrinoless double beta decay results of CUORE from examining a total TeO2 exposure of 86.3kg yr, characterized by an effective energy resolution of 7.7 keV FWHM and a background in the region of interest of 0.014 counts/ (keV kg yr). In this physics run, CUORE placed a lower limit on the decay half- life of neutrinoless double beta decay of 130Te > 1.3.1025 yr (90% C. L.). Moreover, an analysis of the background of the experiment is presented as well as the measurement of the 130Te 2vo3p decay with a resulting half- life of T2 2. [7.9 :- 0.1 (stat.) :- 0.2 (syst.)] x 10(20) yr which is the most precise measurement of the half- life and compatible with previous results

    Analisi degli episodi di violenza in un grande ospedale Italiano

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    Introduction: An increase in the rate of non-fatal violence events, from 20.65/10,000 in 2012 to 22.81/10,000 in 2014, was observed at the IRCCS Ospedale Policlinico San Martino in Genoa. Objectives: To analyze the incidence and outcome of the phenomenon of violence, by identifying the type of aggressive event and the ward in which it occurred, assuming that the occurrence is evenly distributed and not only limited to the psychiatric or to the emergency department. The age and sex of both attackers and victims of aggression were also analyzed. Methods: Retrospective analysis: study of injury trends related to episodes of violence between 2012 and 2015, incidence compared to other injuries and evaluation of the direct costs. Observational staff surveys with a questionnaire based on the Overt Aggression Scale and statistical data analysis. Results: Following the aggressions, 36 injuries were identified over the study period (2012-2015), resulting in 431 days of absence from work. The direct estimated costs were √ā¬£ 64,170. The observational surveys of each ward showed a high concentration of events. Reports were received from 34 out of the 76 evaluated wards. Seventy-five percent of the reports concerned only four operative units: emergency room, intermediate care, psychiatry and geriatrics. Sixty-one percent of the questionnaires were filled out by nurses, 23% by support staff and the remaining 16% was provided by physicians and coordinators. Conclusions: Violence against healthcare workers is a well-known problem; action is required on the scheduling of activities, improvement of communication paths with users and the training of operators

    Highly-parallelized simulation of a pixelated LArTPC on a GPU

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    The rapid development of general-purpose computing on graphics processing units (GPGPU) is allowing the implementation of highly-parallelized Monte Carlo simulation chains for particle physics experiments. This technique is particularly suitable for the simulation of a pixelated charge readout for time projection chambers, given the large number of channels that this technology employs. Here we present the first implementation of a full microphysical simulator of a liquid argon time projection chamber (LArTPC) equipped with light readout and pixelated charge readout, developed for the DUNE Near Detector. The software is implemented with an end-to-end set of GPU-optimized algorithms. The algorithms have been written in Python and translated into CUDA kernels using Numba, a just-in-time compiler for a subset of Python and NumPy instructions. The GPU implementation achieves a speed up of four orders of magnitude compared with the equivalent CPU version. The simulation of the current induced on 10310^3 pixels takes around 1 ms on the GPU, compared with approximately 10 s on the CPU. The results of the simulation are compared against data from a pixel-readout LArTPC prototype