L. Perasso - DarkSide Collaboration

L. Perasso
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Name
L. Perasso
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DarkSide Collaboration
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High Energy Physics - Experiment (14)
 
Physics - Instrumentation and Detectors (13)
 
Instrumentation and Methods for Astrophysics (4)
 
Nuclear Experiment (4)
 
High Energy Physics - Phenomenology (3)
 
Solar and Stellar Astrophysics (2)
 
Physics - Atmospheric and Oceanic Physics (1)
 
Nuclear Theory (1)
 
High Energy Astrophysical Phenomena (1)

Publications Authored By L. Perasso

The Extreme Energy Events Project is a synchronous sparse array of 52 tracking detectors for studying High Energy Cosmic Rays (HECR) and Cosmic Rays-related phenomena. The observatory is also meant to address Long Distance Correlation (LDC) phenomena: the network is deployed over a broad area covering 10 degrees in latitude and 11 in longitude. An overview of a set of preliminary results is given, extending from the study of local muon flux dependance on solar activity to the investigation of the upward-going component of muon flux traversing the EEE stations; from the search for anisotropies at the sub-TeV scale to the hints for observations of km-scale Extensive Air Shower (EAS). Read More

The main physical results on the registration of solar neutrinos and the search for rare processes obtained by the Borexino collaboration to date are presented. Read More

Borexino is a liquid scintillation detector located deep underground at the Laboratori Nazionali del Gran Sasso (LNGS, Italy). Thanks to the unmatched radio-purity of the scintillator, and to the well understood detector response at low energy, a new limit on the stability of the electron for decay into a neutrino and a single mono-energetic photon was obtained. This new bound, tau > 6. Read More

The Sun is fueled by a series of nuclear reactions that produce the energy that makes it shine. The primary reaction is the fusion of two protons into a deuteron, a positron and a neutrino. These neutrinos constitute the vast majority of neutrinos reaching Earth, providing us with key information about what goes on at the core of our star. Read More

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. Read More

We report an improved geo-neutrino measurement with Borexino from 2056 days of data taking. The present exposure is $(5.5\pm0. Read More

Borexino is a unique detector able to perform measurement of solar neutrinos fluxes in the energy region around 1 MeV or below due to its low level of radioactive background. It was constructed at the LNGS underground laboratory with a goal of solar $^{7}$Be neutrino flux measurement with 5\% precision. The goal has been successfully achieved marking the end of the first stage of the experiment. Read More

The Borexino experiment, located in the Gran Sasso National Laboratory, is an organic liquid scintillator detector conceived for the real time spectroscopy of low energy solar neutrinos. The data taking campaign phase I (2007 - 2010) has allowed the first independent measurements of 7Be, 8B and pep fluxes as well as the first measurement of anti-neutrinos from the earth. After a purification of the scintillator, Borexino is now in phase II since 2011. Read More

If heavy neutrinos with mass $m_{\nu_{H}}\geq$2$ m_e $ are produced in the Sun via the decay ${^8\rm{B}} \rightarrow {^8\rm{Be}} + e^+ + \nu_H$ in a side branch of pp-chain, they would undergo the observable decay into an electron, a positron and a light neutrino $\nu_{H}\rightarrow\nu_{L}+e^++e^-$. In the present work Borexino data are used to set a bound on the existence of such decays. We constrain the mixing of a heavy neutrino with mass 1. Read More

Borexino has been running since May 2007 at the LNGS with the primary goal of detecting solar neutrinos. The detector, a large, unsegmented liquid scintillator calorimeter characterized by unprecedented low levels of intrinsic radioactivity, is optimized for the study of the lower energy part of the spectrum. During the Phase-I (2007-2010) Borexino first detected and then precisely measured the flux of the 7Be solar neutrinos, ruled out any significant day-night asymmetry of their interaction rate, made the first direct observation of the pep neutrinos, and set the tightest upper limit on the flux of CNO neutrinos. Read More

The solar neutrino experiment Borexino, which is located in the Gran Sasso underground laboratories, is in a unique position to study muon-induced backgrounds in an organic liquid scintillator. In this study, a large sample of cosmic muons is identified and tracked by a muon veto detector external to the liquid scintillator, and by the specific light patterns observed when muons cross the scintillator volume. The yield of muon-induced neutrons is found to be Yn =(3. Read More

We present a measurement of the geo--neutrino signal obtained from 1353 days of data with the Borexino detector at Laboratori Nazionali del Gran Sasso in Italy. With a fiducial exposure of (3.69 $\pm$ 0. Read More

We have studied the alpha decays of 214Po into 210Pb and of 212Po into 208Pb tagged by the coincidence with the preceding beta decays from 214Bi and 212Bi, respectively. The employed 222Rn, 232Th, and 220Rn sources were sealed inside quartz vials and inserted in the Counting Test Facility at the underground Gran Sasso National Laboratory in Italy. We find that the mean lifetime of 214Po is (236. Read More

Borexino was the first experiment to detect solar neutrinos in real-time in the sub-MeV region. In order to achieve high precision in the determination of neutrino rates, the detector design includes an internal and an external calibration system. This paper describes both calibration systems and the calibration campaigns that were carried out in the period between 2008 and 2011. Read More

Borexino is a large-volume liquid scintillator detector installed in the underground halls of the Laboratori Nazionali del Gran Sasso in Italy. After several years of construction, data taking started in May 2007. The Borexino phase I ended after about three years of data taking. Read More

2012Apr
Authors: T. Alexander1, D. Alton2, K. Arisaka3, H. O. Back4, P. Beltrame5, J. Benziger6, G. Bonfini7, A. Brigatti8, J. Brodsky9, L. Cadonati10, F. Calaprice11, A. Candela12, H. Cao13, P. Cavalcante14, A. Chavarria15, A. Chepurnov16, D. Cline17, A. G. Cocco18, C. Condon19, D. D'Angelo20, S. Davini21, E. De Haas22, A. Derbin23, G. Di Pietro24, I. Dratchnev25, D. Durben26, A. Empl27, A. Etenko28, A. Fan29, G. Fiorillo30, K. Fomenko31, F. Gabriele32, C. Galbiati33, S. Gazzana34, C. Ghag35, C. Ghiano36, A. Goretti37, L. Grandi38, M. Gromov39, M. Guan40, C. Guo41, G. Guray42, E. V. Hungerford43, Al. Ianni44, An. Ianni45, A. Kayunov46, K. Keeter47, C. Kendziora48, S. Kidner49, V. Kobychev50, G. Koh51, D. Korablev52, G. Korga53, E. Shields54, P. Li55, B. Loer56, P. Lombardi57, C. Love58, L. Ludhova59, L. Lukyanchenko60, A. Lund61, K. Lung62, Y. Ma63, I. Machulin64, J. Maricic65, C. J. Martoff66, Y. Meng67, E. Meroni68, P. D. Meyers69, T. Mohayai70, D. Montanari71, M. Montuschi72, P. Mosteiro73, B. Mount74, V. Muratova75, A. Nelson76, A. Nemtzow77, N. Nurakhov78, M. Orsini79, F. Ortica80, M. Pallavicini81, E. Pantic82, S. Parmeggiano83, R. Parsells84, N. Pelliccia85, L. Perasso86, F. Perfetto87, L. Pinsky88, A. Pocar89, S. Pordes90, G. Ranucci91, A. Razeto92, A. Romani93, N. Rossi94, P. Saggese95, R. Saldanha96, C. Salvo97, W. Sands98, M. Seigar99, D. Semenov100, M. Skorokhvatov101, O. Smirnov102, A. Sotnikov103, S. Sukhotin104, Y. Suvorov105, R. Tartaglia106, J. Tatarowicz107, G. Testera108, A. Teymourian109, J. Thompson110, E. Unzhakov111, R. B. Vogelaar112, H. Wang113, S. Westerdale114, M. Wojcik115, A. Wright116, J. Xu117, C. Yang118, S. Zavatarelli119, M. Zehfus120, W. Zhong121, G. Zuzel122
Affiliations: 1DarkSide Collaboration, 2DarkSide Collaboration, 3DarkSide Collaboration, 4DarkSide Collaboration, 5DarkSide Collaboration, 6DarkSide Collaboration, 7DarkSide Collaboration, 8DarkSide Collaboration, 9DarkSide Collaboration, 10DarkSide Collaboration, 11DarkSide Collaboration, 12DarkSide Collaboration, 13DarkSide Collaboration, 14DarkSide Collaboration, 15DarkSide Collaboration, 16DarkSide Collaboration, 17DarkSide Collaboration, 18DarkSide Collaboration, 19DarkSide Collaboration, 20DarkSide Collaboration, 21DarkSide Collaboration, 22DarkSide Collaboration, 23DarkSide Collaboration, 24DarkSide Collaboration, 25DarkSide Collaboration, 26DarkSide Collaboration, 27DarkSide Collaboration, 28DarkSide Collaboration, 29DarkSide Collaboration, 30DarkSide Collaboration, 31DarkSide Collaboration, 32DarkSide Collaboration, 33DarkSide Collaboration, 34DarkSide Collaboration, 35DarkSide Collaboration, 36DarkSide Collaboration, 37DarkSide Collaboration, 38DarkSide Collaboration, 39DarkSide Collaboration, 40DarkSide Collaboration, 41DarkSide Collaboration, 42DarkSide Collaboration, 43DarkSide Collaboration, 44DarkSide Collaboration, 45DarkSide Collaboration, 46DarkSide Collaboration, 47DarkSide Collaboration, 48DarkSide Collaboration, 49DarkSide Collaboration, 50DarkSide Collaboration, 51DarkSide Collaboration, 52DarkSide Collaboration, 53DarkSide Collaboration, 54DarkSide Collaboration, 55DarkSide Collaboration, 56DarkSide Collaboration, 57DarkSide Collaboration, 58DarkSide Collaboration, 59DarkSide Collaboration, 60DarkSide Collaboration, 61DarkSide Collaboration, 62DarkSide Collaboration, 63DarkSide Collaboration, 64DarkSide Collaboration, 65DarkSide Collaboration, 66DarkSide Collaboration, 67DarkSide Collaboration, 68DarkSide Collaboration, 69DarkSide Collaboration, 70DarkSide Collaboration, 71DarkSide Collaboration, 72DarkSide Collaboration, 73DarkSide Collaboration, 74DarkSide Collaboration, 75DarkSide Collaboration, 76DarkSide Collaboration, 77DarkSide Collaboration, 78DarkSide Collaboration, 79DarkSide Collaboration, 80DarkSide Collaboration, 81DarkSide Collaboration, 82DarkSide Collaboration, 83DarkSide Collaboration, 84DarkSide Collaboration, 85DarkSide Collaboration, 86DarkSide Collaboration, 87DarkSide Collaboration, 88DarkSide Collaboration, 89DarkSide Collaboration, 90DarkSide Collaboration, 91DarkSide Collaboration, 92DarkSide Collaboration, 93DarkSide Collaboration, 94DarkSide Collaboration, 95DarkSide Collaboration, 96DarkSide Collaboration, 97DarkSide Collaboration, 98DarkSide Collaboration, 99DarkSide Collaboration, 100DarkSide Collaboration, 101DarkSide Collaboration, 102DarkSide Collaboration, 103DarkSide Collaboration, 104DarkSide Collaboration, 105DarkSide Collaboration, 106DarkSide Collaboration, 107DarkSide Collaboration, 108DarkSide Collaboration, 109DarkSide Collaboration, 110DarkSide Collaboration, 111DarkSide Collaboration, 112DarkSide Collaboration, 113DarkSide Collaboration, 114DarkSide Collaboration, 115DarkSide Collaboration, 116DarkSide Collaboration, 117DarkSide Collaboration, 118DarkSide Collaboration, 119DarkSide Collaboration, 120DarkSide Collaboration, 121DarkSide Collaboration, 122DarkSide Collaboration

As part of the DarkSide program of direct dark matter searches using liquid argon TPCs, a prototype detector with an active volume containing 10 kg of liquid argon, DarkSide-10, was built and operated underground in the Gran Sasso National Laboratory in Italy. A critically important parameter for such devices is the scintillation light yield, as photon statistics limits the rejection of electron-recoil backgrounds by pulse shape discrimination. We have measured the light yield of DarkSide-10 using the readily-identifiable full-absorption peaks from gamma ray sources combined with single-photoelectron calibrations using low-occupancy laser pulses. Read More

We have measured the muon flux at the underground Gran Sasso National Laboratory (3800 m w.e.) to be (3. Read More

Borexino, a liquid scintillator detector at LNGS, is designed for the detection of neutrinos and antineutrinos from the Sun, supernovae, nuclear reactors, and the Earth. The feeble nature of these signals requires a strong suppression of backgrounds below a few MeV. Very low intrinsic radiogenic contamination of all detector components needs to be accompanied by the efficient identification of muons and of muon-induced backgrounds. Read More