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Search Results: 1 - 10 of 401179 matches for " M. Giammarchi "
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Efficient positronium laser excitation for antihydrogen production in a magnetic field
F. Castelli,I. Boscolo,S. Cialdi,M. G. Giammarchi,D. Comparat
Physics , 2008, DOI: 10.1103/PhysRevA.78.052512
Abstract: Antihydrogen production by charge exchange reaction between Positronium (Ps) atoms and antiprotons requires an efficient excitation of Ps atoms up to high-n levels (Rydberg levels). In this study it is assumed that a Ps cloud is produced within a relatively strong uniform magnetic field (1 Tesla) and with a relatively high temperature (100 K). Consequently, the structure of energy levels are deeply modified by Zeeman and motional Stark effects. A two-step laser light excitation, the first one from ground to n=3 and the second from this level to a Rydberg level, is proposed and the physics of the problem is discussed. We derive a simple formula giving the absorption probability with substantially incoherent laser pulses. A 30% population deposition in high-$n$ states can be reached with feasible lasers suitably tailored in power and spectral bandwidth.
AEGIS at CERN: Measuring Antihydrogen Fall
Marco G. Giammarchi
Physics , 2011, DOI: 10.1007/s00601-012-0439-6
Abstract: The main goal of the AEGIS experiment at the CERN Antiproton Decelerator is the test of fundamental laws such as the Weak Equivalence Principle (WEP) and CPT symmetry. In the first phase of AEGIS, a beam of antihydrogen will be formed whose fall in the gravitational field is measured in a Moire' deflectometer; this will constitute the first test of the WEP with antimatter.
Geoneutrinos in Borexino
Marco G. Giammarchi,Lino Miramonti
Physics , 2006, DOI: 10.1007/s11038-006-9106-6
Abstract: This paper describes the Borexino detector and the high-radiopurity studies and tests that are integral part of the Borexino technology and development. The application of Borexino to the detection and studies of geoneutrinos is discussed.
High sensitivity double beta decay study of 116-Cd and 100-Mo with the BOREXINO Counting Test Facility (CAMEO project)
G. Bellini,B. Caccianiga,M. Chen,F. A. Danevich,M. G. Giammarchi,V. V. Kobychev,B. N. Kropivyansky,E. Meroni,L. Miramonti,A. S. Nikolayko,L. Oberauer,O. A. Ponkratenko,V. I. Tretyak,S. Yu. Zdesenko,Yu. G. Zdesenko
Physics , 2000, DOI: 10.1007/s100520100594
Abstract: The unique features (super-low background and large sensitive volume) of the CTF and BOREXINO set ups are used in the CAMEO project for a high sensitivity study of 100-Mo and 116-Cd neutrinoless double beta decay. Pilot measurements with 116-Cd and Monte Carlo simulations show that the sensitivity of the CAMEO experiment (in terms of the half-life limit for neutrinoless double beta decay) is (3-5) 10^24 yr with a 1 kg source of 100-Mo (116-Cd, 82-Se, and 150-Nd) and about 10^26 yr with 65 kg of enriched 116-CdWO_4 crystals placed in the liquid scintillator of the CTF. The last value corresponds to a limit on the neutrino mass of less than 0.06 eV. Similarly with 1000 kg of 116-CdWO_4 crystals located in the BOREXINO apparatus the neutrino mass limit can be pushed down to m_nu<0.02 eV.
Formation Of A Cold Antihydrogen Beam in AEGIS For Gravity Measurements
G. Testera,A. S. Belov,G. Bonomi,I. Boscolo,N. Brambilla,R. S. Brusa,V. M. Byakov,L. Cabaret,C. Canali,C. Carraro,F. Castelli,S. Cialdi,M. de Combarieu,D. Comparat,G. Consolati,N. Djourelov,M. Doser,G. Drobychev,A. Dupasquier,D. Fabris,R. Ferragut,G. Ferrari,A. Fischer,A. Fontana,P. Forget,L. Formaro,M. Lunardon,A. Gervasini,M. G. Giammarchi,S. N. Gninenko,G. Gribakin,R. Heyne,S. D. Hogan,A. Kellerbauer,D. Krasnicky,V. Lagomarsino,G. Manuzio,S. Mariazzi,V. A. Matveev,F. Merkt,S. Moretto,C. Morhard,G. Nebbia,P. Nedelec,M. K. Oberthaler,P. Pari,V. Petracek,M. Prevedelli,I. Y. Al-Qaradawi,F. Quasso,O. Rohne,S. Pesente,A. Rotondi,S. Stapnes,D. Sillou,S. V. Stepanov,H. H. Stroke,G. Tino,A. Vairo,G. Viesti,H. Walters,U. Warring,S. Zavatarelli,A. Zenoni,D. S. Zvezhinskij,for the AEGIS Proto-Collaboration
Physics , 2008, DOI: 10.1063/1.2977857
Abstract: The formation of the antihydrogen beam in the AEGIS experiment through the use of inhomogeneous electric fields is discussed and simulation results including the geometry of the apparatus and realistic hypothesis about the antihydrogen initial conditions are shown. The resulting velocity distribution matches the requirements of the gravity experiment. In particular it is shown that the inhomogeneous electric fields provide radial cooling of the beam during the acceleration.
Prospects for measuring the gravitational free-fall of antihydrogen with emulsion detectors
AEgIS Collaboration,S. Aghion,O. Ahlén,C. Amsler,A. Ariga,T. Ariga,A. S. Belov,G. Bonomi,P. Br?unig,J. Bremer,R. S. Brusa,L. Cabaret,C. Canali,R. Caravita,F. Castelli,G. Cerchiari,S. Cialdi,D. Comparat,G. Consolati,J. H. Derking,S. Di Domizio,L. Di Noto,M. Doser,A. Dudarev,A. Ereditato,R. Ferragut,A. Fontana,P. Genova,M. Giammarchi,A. Gligorova,S. N. Gninenko,S. Haider,J. Harasimovicz,S. D. Hogan,T. Huse,E. Jordan,L. V. J?rgensen,T. Kaltenbacher,J. Kawada,A. Kellerbauer,M. Kimura,A. Knecht,D. Krasnicky,V. Lagomarsino,A. Magnani,S. Mariazzi,V. A. Matveev,F. Moia,G. Nebbia,P. Nédélec,M. K. Oberthaler,N. Pacifico,V. Petrácek,C. Pistillo,F. Prelz,M. Prevedelli,C. Regenfus,C. Riccardi,O. R?hne,A. Rotondi,H. Sandaker,P. Scampoli,A. Sosa,J. Storey,M. A. Subieta Vasquez,M. Spacek,G. Testera,D. Trezzi,R. Vaccarone,C. P. Welsch,S. Zavatarelli
Physics , 2013, DOI: 10.1088/1748-0221/8/08/P08013
Abstract: The main goal of the AEgIS experiment at CERN is to test the weak equivalence principle for antimatter. AEgIS will measure the free-fall of an antihydrogen beam traversing a moir\'e deflectometer. The goal is to determine the gravitational acceleration g for antihydrogen with an initial relative accuracy of 1% by using an emulsion detector combined with a silicon micro-strip detector to measure the time of flight. Nuclear emulsions can measure the annihilation vertex of antihydrogen atoms with a precision of about 1 - 2 microns r.m.s. We present here results for emulsion detectors operated in vacuum using low energy antiprotons from the CERN antiproton decelerator. We compare with Monte Carlo simulations, and discuss the impact on the AEgIS project.
Annihilation of low energy antiprotons in silicon
S. Aghion,O. Ahlén,A. S. Belov,G. Bonomi,P. Br?unig,J. Bremer,R. S. Brusa,G. Burghart,L. Cabaret,M. Caccia,C. Canali,R. Caravita,F. Castelli,G. Cerchiari,S. Cialdi,D. Comparat,G. Consolati,J. H. Derking,S. Di Domizio,L. Di Noto,M. Doser,A. Dudarev,R. Ferragut,A. Fontana,P. Genova,M. Giammarchi,A. Gligorova,S. N. Gninenko,S. Haider,J. Harasimowicz,T. Huse,E. Jordan,L. V. J?rgensen,T. Kaltenbacher,A. Kellerbauer,A. Knecht,D. Krasnicky,V. Lagomarsino,A. Magnani,S. Mariazzi,V. A. Matveev,F. Moia,G. Nebbia,P. Nédélec,N. Pacifico,V. Petrácek,F. Prelz,M. Prevedelli,C. Regenfus,C. Riccardi,O. R?hne,A. Rotondi,H. Sandaker,A. Sosa,M. A. Subieta Vasquez,M. ?pacek,G. Testera,C. P. Welsch,S. Zavatarelli
Physics , 2013,
Abstract: The goal of the AE$\mathrm{\bar{g}}$IS experiment at the Antiproton Decelerator (AD) at CERN, is to measure directly the Earth's gravitational acceleration on antimatter. To achieve this goal, the AE$\mathrm{\bar{g}}$IS collaboration will produce a pulsed, cold (100 mK) antihydrogen beam with a velocity of a few 100 m/s and measure the magnitude of the vertical deflection of the beam from a straight path. The final position of the falling antihydrogen will be detected by a position sensitive detector. This detector will consist of an active silicon part, where the annihilations take place, followed by an emulsion part. Together, they allow to achieve 1$%$ precision on the measurement of $\bar{g}$ with about 600 reconstructed and time tagged annihilations. We present here, to the best of our knowledge, the first direct measurement of antiproton annihilation in a segmented silicon sensor, the first step towards designing a position sensitive silicon detector for the AE$\mathrm{\bar{g}}$IS experiment. We also present a first comparison with Monte Carlo simulations (GEANT4) for antiproton energies below 5 MeV
A test of electric charge conservation with Borexino
Borexino Collaboration,M. Agostini,S. Appel,G. Bellini,J. Benziger,D. Bick,G. Bonfini,D. Bravo,B. Caccianiga,F. Calaprice,A. Caminata,P. Cavalcante,A. Chepurnov,D. D'Angelo,S. Davini,A. Derbin,L. Di Noto,I. Drachnev,A. Empl,A. Etenko,K. Fomenko,D. Franco,F. Gabriele,C. Galbiati,C. Ghiano,M. Giammarchi,M. Goeger-Neff,A. Goretti,M. Gromov,C. Hagner,E. Hungerford,Aldo Ianni,Andrea Ianni,K. Jedrzejczak,M. Kaiser,V. Kobychev,D. Korablev,G. Korga,D. Kryn,M. Laubenstein,B. Lehnert,E. Litvinovich,F. Lombardi,P. Lombardi,L. Ludhova,G. Lukyanchenko,I. Machulin,S. Manecki,W. Maneschg,S. Marcocci,E. Meroni,M. Meyer,L. Miramonti,M. Misiaszek,M. Montuschi,P. Mosteiro,V. Muratova,B. Neumair,L. Oberauer,M. Obolensky,F. Ortica,K. Otis,M. Pallavicini,L. Papp,L. Perasso,A. Pocar,G. Ranucci,A. Razeto,A. Re,A. Romani,R. Roncin,N. Rossi,S. Schoenert,D. Semenov,H. Simgen,M. Skorokhvatov,O. Smirnov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,G. Testera,J. Thurn,M. Toropova,E. Unzhakov,A. Vishneva,R. B. Vogelaar,F. von Feilitzsch,H. Wang,S. Weinz,J. Winter,M. Wojcik,M. Wurm,Z. Yokley,O. Zaimidoroga,S. Zavatarelli,K. Zuber,G. Zuzel
Physics , 2015, DOI: 10.1103/PhysRevLett.115.231802
Abstract: 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 > 6.6 10**28 yr at 90 % C.L., is two orders of magnitude better than the previous limit.
Spectroscopy of geo-neutrinos from 2056 days of Borexino data
Borexino collaboration,M. Agostini,S. Appel,G. Bellini,J. Benziger,D. Bick,G. Bonfini,D. Bravo,B. Caccianiga,F. Calaprice,A. Caminata,P. Cavalcante,A. Chepurnov,K. Choi,D. DAngelo,S. Davini,A. Derbin,L. Di Noto,I. Drachnev,A. Empl,A. Etenko,G. Fiorentini,K. Fomenko,D. Franco,F. Gabriele,C. Galbiati,C. Ghiano,M. Giammarchi,M. Goger-Neff,A. Goretti,M. Gromov,C. Hagner,E. Hungerford,Aldo Ianni,Andrea Ianni,K. Jedrzejczak,M. Kaiser,V. Kobychev,D. Korablev,G. Korga,D. Kryn,M. Laubenstein,B. Lehnert,E. Litvinovich,F. Lombardi,P. Lombardi,L. Ludhova,G. Lukyanchenko,I. Machulin,S. Manecki,W. Maneschg,F. Mantovani,S. Marcocci,E. Meroni,M. Meyer,L. Miramonti,M. Misiaszek,M. Montuschi,P. Mosteiro,V. Muratova,L. Oberauer,M. Obolensky,F. Ortica,K. Otis,L. Pagani,M. Pallavicini,L. Papp,L. Perasso,S. Perasso,A. Pocar,G. Ranucci,A. Razeto,A. Re,B. Ricci,A. Romani,R. Roncin,N. Rossi,S. Schoenert,D. Semenov,H. Simgen,M. Skorokhavatov,O. Smirnov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,G. Testera,J. Thurn,M. Toropova,E. Unzhakov,R. B. Vogelaar,F. von Feilitzsch,H. Wang,S. Weinz,J. Winter,M. Woicik,M. Wurm,Z. Yokley,O. Zaimidoroga,S. Zavatarelli,K. Zuber,G. Zuzel
Statistics , 2015, DOI: 10.1103/PhysRevD.92.031101
Abstract: We report an improved geo-neutrino measurement with Borexino from 2056 days of data taking. The present exposure is $(5.5\pm0.3)\times10^{31}$ proton$\times$yr. Assuming a chondritic Th/U mass ratio of 3.9, we obtain $23.7 ^{+6.5}_{-5.7} (stat) ^{+0.9}_{-0.6} (sys)$ geo-neutrino events. The null observation of geo-neutrinos with Borexino alone has a probability of $3.6 \times 10^{-9}$ (5.9$\sigma$). A geo-neutrino signal from the mantle is obtained at 98\% C.L. The radiogenic heat production for U and Th from the present best-fit result is restricted to the range 23-36 TW, taking into account the uncertainty on the distribution of heat producing elements inside the Earth.
Measurement of neutrino flux from the primary proton--proton fusion process in the Sun with Borexino detector
O. Y. Smirnov,M. Agostini,S. Appel,G. Bellini,J. Benziger,D. Bick,G. Bonfini,D. Bravo,B. Caccianiga,F. Calaprice,A. Caminata,P. Cavalcante,A. Chepurnov,K. Choi,D. D'Angelo,S. Davini,A. Derbin,L. Di Noto,I. Drachnev,A. Empl,A. Etenko,K. Fomenko,D. Franco,F. Gabriele,C. Galbiati,C. Ghiano,M. Giammarchi,M. Goeger-Neff,A. Goretti,M. Gromov,C. Hagner,E. Hungerford,Aldo Ianni,Andrea Ianni,K. Jedrzejczak,M. Kaiser,V. Kobychev,D. Korablev,G. Korga,D. Kryn,M. Laubenstein,B. Lehnert,E. Litvinovich,F. Lombardi,P. Lombardi,L. Ludhova,G. Lukyanchenko,I. Machulin,S. Manecki,W. Maneschg,S. Marcocci,E. Meroni,M. Meyer,L. Miramonti,M. Misiaszek,P. Mosteiro,V. Muratova,B. Neumair,L. Oberauer,M. Obolensky,F. Ortica,K. Otis,L. Pagani,M. Pallavicini,L. Papp,L. Perasso,A. Pocar,G. Ranucci,A. Razeto,A. Re,A. Romani,R. Roncin,N. Rossi,S. Sch?nert,D. Semenov,H. Simgen,M. Skorokhvatov,A. Sotnikov,S. Sukhotin,Y. Suvorov,R. Tartaglia,G. Testera,J. Thurn,M. Toropova,E. Unzhakov,R. B. Vogelaar,F. von Feilitzsch,H. Wang,S. Weinz,J. Winter,M. Wojcik,M. Wurm,Z. Yokley,O. Zaimidoroga,S. Zavatarelli,K. Zuber,G. Zuzel
Physics , 2015,
Abstract: 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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