Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1992
The behaviour of BGO sectors, designed for an electromagnetic calorimeter to be operated at up to... more The behaviour of BGO sectors, designed for an electromagnetic calorimeter to be operated at up to 2 GeV, is considered in relation to the different terms that contribute to the overall BGO resolution and to the techniques that can be adopted to reduce them to a minimum. In particular, the measurements of light collection uniformity and energy resolution obtained on a large number of sectors are reported, and their effect on the overall BGO resolution analyzed .
A quasi-monokinetic triton beam of 10 7 particles per cycle and 3% momentum spread has been obtai... more A quasi-monokinetic triton beam of 10 7 particles per cycle and 3% momentum spread has been obtained by ~-particle fragmentation. A possible extension of the method to exotic ions beams is briefly discussed, using recent high energy data about nuclear fragmentation of" heavy ions.
Abstract A monitoring system for the LNF-LEALE positive and negative medium energy pion beams is ... more Abstract A monitoring system for the LNF-LEALE positive and negative medium energy pion beams is described. The system is based upon the integral measurement of the beam charge, in analogy with Faraday-cup methods used for electron beams. Results of experimental tests are reported together with a discussion of correction methods obtained by Monte-Carlo techniques.
The production of r" and 7' mesons in the reactions pd + ~'7 and pd + 7'7 has been studied at ver... more The production of r" and 7' mesons in the reactions pd + ~'7 and pd + 7'7 has been studied at very backward angles for kinetic proton energies Tp ranging from 0.92 to 2.6 GeV. The excitation functions at ~9~ = 0,, = 180" display large structures which might be related to baryonic (A and N*) excitations in the intermediate state.
... Lipari, F. Longo, A. Mauri, S. Mereghetti, E. Morelli, A. Morselli, L. Pacciani, A. Pellizzon... more ... Lipari, F. Longo, A. Mauri, S. Mereghetti, E. Morelli, A. Morselli, L. Pacciani, A. Pellizzoni, F. Perotti, P. Picozza, C. Pittori, C. Pontoni, J. Porrovecchio ... The GRID source location 95 % contour radius for a dim 'y-ray blazar (FE>100MeV 30 x 108 ph cm2s1) observed for two weeks ...
During the current AGILE pointing centered near the Galactic Center the Gamma-Ray Imaging Detecto... more During the current AGILE pointing centered near the Galactic Center the Gamma-Ray Imaging Detector (GRID) has detected significant gamma-ray emission above 100 MeV from a source positionally consistent with the blazar PKS 1510-089 (Position J2000.0: RA=15h12m50.5329s, DEC=-09d05m59.828s, redshift z = 0.361). The source positional error box is centered at Galactic coordinates l = 351.15 deg, b = 40.02 deg with
AGILE is detecting intense gamma-ray emission above 100 MeV from a source consistent with the Fla... more AGILE is detecting intense gamma-ray emission above 100 MeV from a source consistent with the Flat Spectrum Radio Quasar PKS 1222+21 (R.A.=186.2, Dec.=21.4). Integrating from 2010-06-17 09:20 UT to 2010-05-19 09:30 UT, a maximum likelihood analysis yields a detection at a significance level of about 9 sigma, and a flux F = (6.5+/-1.3) 10-6 ph/cm2/s (E > 100 MeV), which correspond to an increase of about a factor of 2 with respect to the previous 48 hours.
In this work we describe the results of performance tests and measures of SiPM of several sizes (... more In this work we describe the results of performance tests and measures of SiPM of several sizes (1×1, 3×3, 5×5) delivered from MEPHI. The SiPMs have been studied both in steady and pulsed stimuli. Aging and temperature behavior are also discussed. Another test has been performed in order to obtain an electrical model of the SiPM to be used in analog simulations. Finally, a design of a pilot chip with 0.35 μm technology implementing a front-end for SiPM aimed to TOF applications with adjustable thresholds and very high dynamical range is described
... F. Lazzarotto, F. Liello, P. Lipari, F. Longo, E. Mattaini, M. Marisaldi, M. Mastropietro, A.... more ... F. Lazzarotto, F. Liello, P. Lipari, F. Longo, E. Mattaini, M. Marisaldi, M. Mastropietro, A. Mauri, F. Mauri, S. Mereghetti, E. Morelli, A. Morselli, L. Pacciani, A. Pellizzoni, F. Perotti, G. Piano, P. Picozza, C. Pontoni, G. Porrovecchio, M ... Single (I-dim) detector FOV (FW at zero sens) ...
A two-coil toroid magnet is proposed for the ASTROMAG facility on the NASA space station. This fi... more A two-coil toroid magnet is proposed for the ASTROMAG facility on the NASA space station. This field fulfils the requirement of zero net dipole moment and the magnet is designed to fit the boundary conditions connected with the use in space. In this paper the magnetic field of the twocoil toroid for the ASTROMAG facility is discussed and compared with that of an equivalent ideal continuous toroid. The volumes of the magnetic field regions are equal for these two extreme cases of toroid, in spite of the deformed shape in case of the two-coil design.
Summary Searching for cosmic antiprotons, balloon-borne experiments were performed in the last y... more Summary Searching for cosmic antiprotons, balloon-borne experiments were performed in the last years, but without a clear answer on the $$\bar p$$ rate and origin. Here we present the project of an antarctic flight of a balloonborne apparatus that in principle could be greatly helpful in clarifying the situation before that experiments on space station or satellites provide the high statistics
X-Ray and Gamma-Ray Instrumentation for Astronomy XI, 2000
AGILE is an innovative, cost-effective gamma-ray mission approved by the Italian Space Agency for... more AGILE is an innovative, cost-effective gamma-ray mission approved by the Italian Space Agency for the Program of Small Scientific Missions. The AGILE gamma-ray instrument is designed to detect and image photons in the 30 MeV - 50 GeV energy band with good sensitivity and very large field of view (FOV). AGILE is planned to be operational during the year 2002
ABSTRACT The first observation of the reaction dd→αη is reported. The missing mass spectrum in dd... more ABSTRACT The first observation of the reaction dd→αη is reported. The missing mass spectrum in dd→αX shows an enhancement at the α momentum corresponding to the η mass. The corresponding c.m. cross section is 0.25±0.10 nb/sr for η’s produced at 146° in the c.m.
In this paper (Part II) we discuss the expected scientific performance of the AGILE mission, focu... more In this paper (Part II) we discuss the expected scientific performance of the AGILE mission, focusing on the large FOV, the spatial resolution and PSF of the y-ray imager, and the crucial capability of simultaneous hard-X and y-ray imaging with N 1-3 arcmin resolution.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1992
The behaviour of BGO sectors, designed for an electromagnetic calorimeter to be operated at up to... more The behaviour of BGO sectors, designed for an electromagnetic calorimeter to be operated at up to 2 GeV, is considered in relation to the different terms that contribute to the overall BGO resolution and to the techniques that can be adopted to reduce them to a minimum. In particular, the measurements of light collection uniformity and energy resolution obtained on a large number of sectors are reported, and their effect on the overall BGO resolution analyzed .
A quasi-monokinetic triton beam of 10 7 particles per cycle and 3% momentum spread has been obtai... more A quasi-monokinetic triton beam of 10 7 particles per cycle and 3% momentum spread has been obtained by ~-particle fragmentation. A possible extension of the method to exotic ions beams is briefly discussed, using recent high energy data about nuclear fragmentation of" heavy ions.
Abstract A monitoring system for the LNF-LEALE positive and negative medium energy pion beams is ... more Abstract A monitoring system for the LNF-LEALE positive and negative medium energy pion beams is described. The system is based upon the integral measurement of the beam charge, in analogy with Faraday-cup methods used for electron beams. Results of experimental tests are reported together with a discussion of correction methods obtained by Monte-Carlo techniques.
The production of r" and 7' mesons in the reactions pd + ~'7 and pd + 7'7 has been studied at ver... more The production of r" and 7' mesons in the reactions pd + ~'7 and pd + 7'7 has been studied at very backward angles for kinetic proton energies Tp ranging from 0.92 to 2.6 GeV. The excitation functions at ~9~ = 0,, = 180" display large structures which might be related to baryonic (A and N*) excitations in the intermediate state.
... Lipari, F. Longo, A. Mauri, S. Mereghetti, E. Morelli, A. Morselli, L. Pacciani, A. Pellizzon... more ... Lipari, F. Longo, A. Mauri, S. Mereghetti, E. Morelli, A. Morselli, L. Pacciani, A. Pellizzoni, F. Perotti, P. Picozza, C. Pittori, C. Pontoni, J. Porrovecchio ... The GRID source location 95 % contour radius for a dim 'y-ray blazar (FE>100MeV 30 x 108 ph cm2s1) observed for two weeks ...
During the current AGILE pointing centered near the Galactic Center the Gamma-Ray Imaging Detecto... more During the current AGILE pointing centered near the Galactic Center the Gamma-Ray Imaging Detector (GRID) has detected significant gamma-ray emission above 100 MeV from a source positionally consistent with the blazar PKS 1510-089 (Position J2000.0: RA=15h12m50.5329s, DEC=-09d05m59.828s, redshift z = 0.361). The source positional error box is centered at Galactic coordinates l = 351.15 deg, b = 40.02 deg with
AGILE is detecting intense gamma-ray emission above 100 MeV from a source consistent with the Fla... more AGILE is detecting intense gamma-ray emission above 100 MeV from a source consistent with the Flat Spectrum Radio Quasar PKS 1222+21 (R.A.=186.2, Dec.=21.4). Integrating from 2010-06-17 09:20 UT to 2010-05-19 09:30 UT, a maximum likelihood analysis yields a detection at a significance level of about 9 sigma, and a flux F = (6.5+/-1.3) 10-6 ph/cm2/s (E > 100 MeV), which correspond to an increase of about a factor of 2 with respect to the previous 48 hours.
In this work we describe the results of performance tests and measures of SiPM of several sizes (... more In this work we describe the results of performance tests and measures of SiPM of several sizes (1×1, 3×3, 5×5) delivered from MEPHI. The SiPMs have been studied both in steady and pulsed stimuli. Aging and temperature behavior are also discussed. Another test has been performed in order to obtain an electrical model of the SiPM to be used in analog simulations. Finally, a design of a pilot chip with 0.35 μm technology implementing a front-end for SiPM aimed to TOF applications with adjustable thresholds and very high dynamical range is described
... F. Lazzarotto, F. Liello, P. Lipari, F. Longo, E. Mattaini, M. Marisaldi, M. Mastropietro, A.... more ... F. Lazzarotto, F. Liello, P. Lipari, F. Longo, E. Mattaini, M. Marisaldi, M. Mastropietro, A. Mauri, F. Mauri, S. Mereghetti, E. Morelli, A. Morselli, L. Pacciani, A. Pellizzoni, F. Perotti, G. Piano, P. Picozza, C. Pontoni, G. Porrovecchio, M ... Single (I-dim) detector FOV (FW at zero sens) ...
A two-coil toroid magnet is proposed for the ASTROMAG facility on the NASA space station. This fi... more A two-coil toroid magnet is proposed for the ASTROMAG facility on the NASA space station. This field fulfils the requirement of zero net dipole moment and the magnet is designed to fit the boundary conditions connected with the use in space. In this paper the magnetic field of the twocoil toroid for the ASTROMAG facility is discussed and compared with that of an equivalent ideal continuous toroid. The volumes of the magnetic field regions are equal for these two extreme cases of toroid, in spite of the deformed shape in case of the two-coil design.
Summary Searching for cosmic antiprotons, balloon-borne experiments were performed in the last y... more Summary Searching for cosmic antiprotons, balloon-borne experiments were performed in the last years, but without a clear answer on the $$\bar p$$ rate and origin. Here we present the project of an antarctic flight of a balloonborne apparatus that in principle could be greatly helpful in clarifying the situation before that experiments on space station or satellites provide the high statistics
X-Ray and Gamma-Ray Instrumentation for Astronomy XI, 2000
AGILE is an innovative, cost-effective gamma-ray mission approved by the Italian Space Agency for... more AGILE is an innovative, cost-effective gamma-ray mission approved by the Italian Space Agency for the Program of Small Scientific Missions. The AGILE gamma-ray instrument is designed to detect and image photons in the 30 MeV - 50 GeV energy band with good sensitivity and very large field of view (FOV). AGILE is planned to be operational during the year 2002
ABSTRACT The first observation of the reaction dd→αη is reported. The missing mass spectrum in dd... more ABSTRACT The first observation of the reaction dd→αη is reported. The missing mass spectrum in dd→αX shows an enhancement at the α momentum corresponding to the η mass. The corresponding c.m. cross section is 0.25±0.10 nb/sr for η’s produced at 146° in the c.m.
In this paper (Part II) we discuss the expected scientific performance of the AGILE mission, focu... more In this paper (Part II) we discuss the expected scientific performance of the AGILE mission, focusing on the large FOV, the spatial resolution and PSF of the y-ray imager, and the crucial capability of simultaneous hard-X and y-ray imaging with N 1-3 arcmin resolution.
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