oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 195 )

2018 ( 364 )

2017 ( 379 )

2016 ( 414 )

Custom range...

Search Results: 1 - 10 of 208442 matches for " L. Pattavina "
All listed articles are free for downloading (OA Articles)
Page 1 /208442
Display every page Item
Li-containing scintillating bolometers for low background physics
L. Pattavina
Physics , 2013, DOI: 10.1051/epjconf/20136502003
Abstract: We present the performances of Li-based compounds used as scintillating bolometer for rare decay studies such as double-beta decay and direct dark matter investigations. The compounds are tested in a dilution refrigerator installed in the underground laboratory of Laboratori Nazionali del Gran Sasso (Italy). Low temperature scintillating properties are investigated by means of different radioactive sources, and the radio-purity level for internal contaminations are estimated for possible employment for next generation experiments.
Acetazolamide-induced cilio-choroidal effusion after cataract surgery: unusual posterior involvement
Malagola R, Arrico L, Giannotti R, Pattavina L
Drug Design, Development and Therapy , 2013, DOI: http://dx.doi.org/10.2147/DDDT.S38324
Abstract: cetazolamide-induced cilio-choroidal effusion after cataract surgery: unusual posterior involvement Case report (878) Total Article Views Authors: Malagola R, Arrico L, Giannotti R, Pattavina L Published Date January 2013 Volume 2013:7 Pages 33 - 36 DOI: http://dx.doi.org/10.2147/DDDT.S38324 Received: 19 September 2012 Accepted: 21 November 2012 Published: 23 January 2013 Romualdo Malagola, Loredana Arrico, Rossella Giannotti, Luigi Pattavina Department of Ophthalmology, University of Rome "La Sapienza," Rome, Italy Abstract: Idiosyncratic reactions to a large number of drugs have been reported to cause choroidal detachment and secondary angle-closure glaucoma (ACG). We report a case of bilateral acute ACG and peculiar choroidal effusion following administration of oral acetazolamide immediately after cataract surgery. Few cases of acute secondary ACG with choroidal effusion and anterior shift of the lens-iris diaphragm have been associated with acetazolamide compared with other sulfonamides. As far as we are aware, posterior involvement with retinal folds and papillary edema due to acetazolamide has not been described before.
Acetazolamide-induced cilio-choroidal effusion after cataract surgery: unusual posterior involvement
Malagola R,Arrico L,Giannotti R,Pattavina L
Drug Design, Development and Therapy , 2013,
Abstract: Romualdo Malagola, Loredana Arrico, Rossella Giannotti, Luigi PattavinaDepartment of Ophthalmology, University of Rome "La Sapienza," Rome, ItalyAbstract: Idiosyncratic reactions to a large number of drugs have been reported to cause choroidal detachment and secondary angle-closure glaucoma (ACG). We report a case of bilateral acute ACG and peculiar choroidal effusion following administration of oral acetazolamide immediately after cataract surgery. Few cases of acute secondary ACG with choroidal effusion and anterior shift of the lens-iris diaphragm have been associated with acetazolamide compared with other sulfonamides. As far as we are aware, posterior involvement with retinal folds and papillary edema due to acetazolamide has not been described before.Keywords: acetazolamide, cilio-choroidal effusion, acute ACG, papillary edema, retinal folds
TeO$_2$ bolometers with Cherenkov signal tagging: towards next-generation neutrinoless double beta decay experiments
N. Casali,M. Vignati,J. W. Beeman,F. Bellini,L. Cardani,I. Dafinei,S. Di Domizio,F. Ferroni,L. Gironi,S. Nagorny,F. Orio,L. Pattavina,G. Pessina,G. Piperno,S. Pirro,C. Rusconi,K. Sch?ffner,C. Tomei
Physics , 2014, DOI: 10.1140/epjc/s10052-014-3225-4
Abstract: CUORE, an array of 988 TeO$_2$ bolometers, is about to be one of the most sensitive experiments searching for neutrinoless double-beta decay. Its sensitivity could be further improved by removing the background from $\alpha$ radioactivity. A few years ago it has been pointed out that the signal from $\beta$s can be tagged by detecting the emitted Cherenkov light, which is not produced by $\alpha$s. In this paper we confirm this possibility. For the first time we measured the Cherenkov light emitted by a CUORE crystal, and found it to be 100 eV at the $Q$-value of the decay. To completely reject the $\alpha$ background, we compute that one needs light detectors with baseline noise below 20 eV RMS, a value which is 3-4 times smaller than the average noise of the bolometric light detectors we are using. We point out that an improved light detector technology must be developed to obtain TeO$_2$ bolometric experiments able to probe the inverted hierarchy of neutrino masses.
New experimental limits on the alpha decays of lead isotopes
J. W. Beeman,F. Bellini,L. Cardani,N. Casali,S. Di Domizio,E. Fiorini,L. Gironi,S. S. Nagorny,S. Nisi,F. Orio,L. Pattavina,G. Pessina,G. Piperno,S. Pirro,E. Previtali,C. Rusconi,C. Tomei,M. Vignati
Physics , 2012, DOI: 10.1140/epja/i2013-13050-7
Abstract: For the first time a PbWO4 crystal was grown using ancient Roman lead and it was run as a cryogenic detector. Thanks to the simultaneous and independent read-out of heat and scintillation light, the detector was able to discriminate beta/gamma interactions with respect to alpha particles down to low energies. New more stringent limits on the alpha decays of the lead isotopes are presented. In particular a limit of T_{1/2} > 1.4*10^20 y at a 90% C.L. was evaluated for the alpha decay of 204Pb to 200Hg.
Performances of a large mass ZnSe bolometer to search for rare events
J. W. Beeman,F. Bellini,L. Cardani,N. Casali,I. Dafinei,S. Di Domizio,F. Ferroni,L. Gironi,A. Giuliani,S. Nagorny,F. Orio,L. Pattavina,G. Pessina,G. Piperno,S. Pirro,E. Previtali,C. Rusconi,C. Tomei,M. Vignati
Physics , 2013, DOI: 10.1088/1748-0221/8/05/P05021
Abstract: Scintillating bolometers of ZnSe are the baseline choice of the LUCIFER experiment, whose aim is to observe the neutrinoless double beta decay of 82Se. The independent read-out of the heat and scintillation signals allows to identify and reject alpha particle interactions, the dominant background source for bolometric detectors. In this paper we report the performances of a ZnSe crystal operated within the LUCIFER R&D. We measured the scintillation yield, the energy resolution and the background in the energy region where the signal from neutrinoless double beta decay of 82Se is expected with an exposure of 9.4 kg x days. With a newly developed analysis algorithm we improved the rejection of alpha events, and we estimated the increase in energy resolution obtained by the combination of the heat and light signals. For the first time we measured the light emitted by nuclear recoils, and found it to be compatible with zero. We conclude that the discrimination of nuclear recoils from beta/gamma interactions in the WIMPs energy region is possible, but low-noise light detectors are needed.
Background suppression in massive TeO$_2$ bolometers with Neganov-Luke amplified light detectors
N. Casali,L. Dumoulin,A. Giuliani,M. Mancuso,P. de Marcillac,S. Marnieros,S. S. Nagorny,C. Nones,E. Olivieri,L. Pagnanini,L. Pattavina,S. Pirro,D. Poda,C. Rusconi,K. Sch?effner,M. Tenconi
Physics , 2015,
Abstract: Bolometric detectors are excellent devices for the investigation of neutrinoless double-beta decay (0$\nu\beta\beta$). The observation of such decay would demonstrate the violation of lepton number, and at the same time it would necessarily imply that neutrinos have a Majorana character. The sensitivity of cryogenic detectors based on TeO$_2$ is strongly limited by the alpha background in the region of interest for the 0$\nu\beta\beta$ of $^{130}$Te. It has been demonstrated that particle discrimination in TeO$_2$ bolometers is possible measuring the Cherenkov light produced by particle interactions. However an event-by-event discrimination with NTD-based light detectors has to be demonstrated. We will discuss the performance of a highly-sensitive light detector exploiting the Neganov-Luke effect for signal amplification. The detector, being operated with NTD-thermistor and coupled to a 750 g TeO$_2$ crystal, shows the ability for an event-by-event identification of electron/gamma and alpha particles. The extremely low detector baseline noise, RMS 19 eV, demonstrates the possibility to enhance the sensitivity of TeO$_2$-based 0$\nu\beta\beta$ experiment to an unprecedented level.
Characterization of bolometric Light Detectors for rare event searches
J. W. Beeman,F. Bellini,N. Casali,L. Cardani,I. Dafinei,S. Di Domizio,F. Ferroni,L. Gironi,S. Nagorny,F. Orio,L. Pattavina,G. Pessina,G. Piperno,S. Pirro,E. Previtali,C. Rusconi,C. Tomei,M. Vignati
Physics , 2013, DOI: 10.1088/1748-0221/8/07/P07021
Abstract: Bolometers have proven to be very good detectors to search for rare processes thanks to their excellent energy resolution and their low intrinsic background. Further active background rejection can be obtained by the simultaneous readout of the heat and light signals produced by particles interacting in scintillating bolometers, as proposed by the LUCIFER experiment. In this framework, the choice of the light detector and the optimization of its working conditions play a crucial role. In this paper, we report a study of the performances of a Germanium bolometric light detector in terms of signal amplitude, energy resolution and signal time development. The impact of various operational parameters on the detector performances is discussed.
Particle Discrimination in TeO$_{2}$ Bolometers using Light Detectors read out by Transition Edge Sensors
K. Sch?ffner,G. Angloher,F. Bellini,N. Casali,F. Ferroni,D. Hauff,S. S. Nagorny,L. Pattavina,F. Petricca,S. Pirro,F. Pr?bst,F. Reindl,W. Seidel,R. Strauss
Physics , 2014, DOI: 10.1016/j.astropartphys.2015.03.008
Abstract: An active discrimination of the dominant $\alpha$-background is the prerequisite for future neutrinoless double-beta decay experiments based on TeO$_{2}$ bolometers. We investigate such $\alpha$-particle rejection in cryogenic TeO$_{2}$ bolometers by the detection of Cherenkov light. For a setup consisting of a massive TeO$_{2}$ crystal (285 g) and a separate cryogenic light detector, both using transition edge sensors as temperature sensors operated at around 10 mK, we obtain an event-by-event identification of e/$\gamma$- and $\alpha$-events. We find in the energy interval ranging from 2400 keV to 2800 keV and covering the Q-value of the neutrinoless double-beta decay of $^{130}$Te a separation of the means of the two populations of 3.7 times their width.
First measurement of the partial widths of $^{209}$Bi decay to the ground and to the first excited states
J. W. Beeman,M. Biassoni,C. Brofferio,C. Bucci,S. Capelli,L. Cardani,M. Carrettoni,M. Clemenza,O. Cremonesi,E. Ferri,A. Giachero,L. Gironi,P. Gorla,C. Gotti,C. Maiano,A. Nucciotti,L. Pattavina,M. Pavan,G. Pessina,S. Pirro,E. Previtali,M. Sisti,L. Zanotti
Physics , 2011, DOI: 10.1103/PhysRevLett.108.062501
Abstract: $^{209}$Bi alpha decay to the ground and to the first excited state have been contemporary observed for the first time with a large BGO scintillating bolometer. The half-life of $^{209}$Bi is determined to be $\tau_{1/2}$=(2.01$\pm$0.08)$\cdot10^{19}$ years while the branching ratio for the ground-state to ground-state transition is (98.8$\pm$0.3)%.
Page 1 /208442
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.