30 research outputs found
Discovery of the Eu decay
We report on the first compelling observation of decay of Eu
to the ground state of Pm. The measurement was performed using a 6.15 g
LiEu(BO) crystal operated as a scintillating bolometer. The Q-value
and half-life measured are: Q = 1948.9 keV, and
T y . The
half-life prediction of nuclear theory using the Coulomb and proximity
potential model are in good agreement with this experimental result
Validation of techniques to mitigate copper surface contamination in CUORE
In this article we describe the background challenges for the CUORE
experiment posed by surface contamination of inert detector materials such as
copper, and present three techniques explored to mitigate these backgrounds.
Using data from a dedicated test apparatus constructed to validate and compare
these techniques we demonstrate that copper surface contamination levels better
than 10E-07 - 10E-08 Bq/cm2 are achieved for 238U and 232Th. If these levels
are reproduced in the final CUORE apparatus the projected 90% C.L. upper limit
on the number of background counts in the region of interest is 0.02-0.03
counts/keV/kg/y depending on the adopted mitigation technique.Comment: 10 pages, 6 figures, 6 table
Search for 14.4 keV solar axions from M1 transition of Fe-57 with CUORE crystals
We report the results of a search for axions from the 14.4 keV M1 transition
from Fe-57 in the core of the sun using the axio-electric effect in TeO2
bolometers. The detectors are 5x5x5 cm3 crystals operated at about 10 mK in a
facility used to test bolometers for the CUORE experiment at the Laboratori
Nazionali del Gran Sasso in Italy. An analysis of 43.65 kg d of data was made
using a newly developed low energy trigger which was optimized to reduce the
detectors energy threshold. An upper limit of 0.63 c kg-1 d-1 was established
at 95% C.L.. From this value, a lower bound at 95% C.L. was placed on the
Peccei-Quinn energy scale of fa >= 0.76 10**6 GeV for a value of S=0.55 for the
flavor-singlet axial vector matrix element. Bounds are given for the interval
0.15 < S < 0.55.Comment: 14 pages, 6 figures, submitted to JCA
Valutazione di Health Technology Assessment del sistema di sanificazione biologico a base di probiotici del genere Bacillus (PCHS)
Le infezioni correlate all’assistenza: priorità per la salute pubblica
Epidemiologia delle infezioni correlate all’assistenza in Italia e loro impatto per la salute pubblica
Sistemi di sanificazione attualmente disponibili in Italia
Il Probiotic Cleaning Hygiene System (PCHS): caratteristiche della tecnologia, aspetti di efficacia e sicurezza
Un sistema di sanificazione a base di probiotici per la riduzione delle infezioni correlate all’assistenza e la resistenza antimicrobica: analisi dell’impatto sul budget
Impatto ambientale per la salute pubblica degli attuali sistemi di sanificazione di ambienti/superfici in setting assistenziale e comunitario e potenziali benefici dei nuovi sistemi innovativi
Analisi delle principali raccomandazioni nazionali su sanificazione e disinfezione degli ambienti sanitari
Valutazione etica dell’utilizzo del Probiotic Cleaning Hygiene System (PCHS) in Italia
Elementi chiave per il processo decisional
The commissioning of the CUORE experiment: the mini-tower run
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
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
Initial performance of the CUORE-0 experiment
CUORE-0 is a cryogenic detector that uses an array of tellurium dioxide
bolometers to search for neutrinoless double-beta decay of ^{130}Te. We present
the first data analysis with 7.1 kg y of total TeO_2 exposure focusing on
background measurements and energy resolution. The background rates in the
neutrinoless double-beta decay region of interest (2.47 to 2.57 MeV) and in the
{\alpha} background-dominated region (2.70 to 3.90 MeV) have been measured to
be 0.071 \pm 0.011 and 0.019 \pm 0.002 counts/keV/kg/y, respectively. The
latter result represents a factor of 6 improvement from a predecessor
experiment, Cuoricino. The results verify our understanding of the background
sources in CUORE-0, which is the basis of extrapolations to the full CUORE
detector. The obtained energy resolution (full width at half maximum) in the
region of interest is 5.7 keV. Based on the measured background rate and energy
resolution in the region of interest, CUORE-0 half-life sensitivity is expected
to surpass the observed lower bound of Cuoricino with one year of live time.Comment: 8 pages, 5 figures, version 2 as published in Eur. Phys. J.
Neutrinoless double-beta decay search with CUORE and CUORE-0 experiments
The Cryogenic Underground Observatory for Rare Events (CUORE) is an upcoming experiment designed to search for the neutrinoless double-beta decays. Observation of the process would unambiguously establish that neutrinos are Majorana particles and provide information on their absolute mass scale hierarchy. CUORE is now under construction and will consist of an array of 988 TeO2 crystal bolometers operated at 10 mK, but the first tower (CUORE-0) is already taking data. The experimental techniques used will be presented as well as the preliminary CUORE-0 results. The current status of the full-mass experiment and its expected sensitivity will then be discussed
Il pensiero giuridico di Piero Calamandrei
La tesi analizza il pensiero giuridico di Calamandrei: in particolare le posizioni piĂą importanti da lui sostenute durante i lavori dell'Assemblea costituente.
Con riferimento alla struttura costituzionale della Repubblica, Calamandrei propugnava l'adozione di una Repubblica presidenziale sul modello americano, al fine di rafforzare l'autoritĂ del capo del governo e rimediare alla frammentazione partitica.
In tema di laicitĂ dello Stato e con riferimento ai rapporti tra Stato e Chiesa cattolica, si oppose all'inserimento in Costituzione di quello che diverrĂ l'art. 7 Costituzione.
Sempre su tale tema, importanti furono i suoi scritti sulla libertĂ della scuola e dell'insegnamento.
S'impegnò per garantire l'indipendenza della magistratura e liberare la giustizia dalle influenze esercitate dalla politica.
PiĂą complessa la posizione che assunse in ordine all'introduzione nella Costituzione dei diritti sociali accanto ai diritti di libertĂ . Si analizzano le ragioni per cui egli, che credeva profondamente nella giustizia sociale, voleva porre i diritti sociali al di fuori della Carta costituzionale.
Si esamina il pensiero del giurista sul principio di legalitĂ a cui egli faceva riferimento costante nei suoi scritti ed interventi.
Si riporta la denuncia che Calamandrei fece allo stato delle carceri e s'espone la sua posizione sulla pena di morte
Health professionals of prevention in Italy. The value of expertise during COVID-19 pandemic
There are 22 different degree courses related to the Healthcare Professions in the Italian university system, which are divided into four areas. "Healthcare Professions of Prevention" is the fourth area and it is fundamental for the National Health Service. In particular, in this pandemic emergency situation, the contribution of the Prevention Technicians in the Environment and Workplaces (PTEW) is essential in the field and workplace management. The "Core Competence" of the PTEW is to carry out, with professional autonomy, prevention, verification, and control activities in the field of hygiene and safety of living and working environments. In the hospitals, the indications provided by national and/or regional authorities are implemented through procedures on good hygiene practices developed by PTEW (e.g., hand hygiene, "respiratory tract hygiene," environmental hygiene, social distancing, and use of Personal Protective Equipment). One of the activities is the health surveillance on the field by population monitoring. The protocols foreseen for the "in-flow of workers" involve a wider control between social life and work. The PTEW will use a Check List divided into 3 macro phases: Entry, Activity Context, and Exit, defining each behavior of the work phases with a constant presence of verification of the procedures. The PTEW will be a Leader on the topics of education, training, and persuasion, considering a New Principle that "transforms the worker as active part in the application and diffusion of the safety measures"