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151. SEARCH FOR FREE NEUTRON-ANTINEUTRON OSCILLATIONS

Author

G. Bressi, E. Calligarich, M. Cambiaghi, R. Dolfini, M. Genoni, A. Gigli Berzolari, A. Lanza, G. Liguori, F. Mauri, A. Piazzoli, S. P. Ratti, P. Torre, C. Bini, M. Conversi, G. Zorzi, P. Gauzzi, F. Massa, D. Zanello, R. Cardarelli, R. Santonico, D. Scannicchio, and M. Terrani

Subjects
Physics and Astronomy (miscellaneous), Engineering (miscellaneous)
Published
1989

152. Search for Free Neutron-Antineutron Oscillations

Author

P. Torre, R. Santonico, D. Zanello, Mario Terrani, Sergio P Ratti, M. Cambiaghi, G. Bressi, A. Lanza, A. Gigli Berzolari, Roberto Cardarelli, A. Piazzoli, E. Calligarich, F. Mauri, M. Conversi, D. A. Scannicchio, G. Liguori, G. De Zorzi, F. Massa, and R. Dolfini

Subjects
Nuclear physics, Physics, Conservation law, Proton decay, Neutron, Elementary particle, Baryon number, Quantum field theory, Nuclear Experiment, Antineutron, Neutron temperature
Abstract

Small violations of the baryon number conservation law are predicted by the Grand Unified Theories. Several attempts have been made to observe a ΔB = 1 violation in proton decay experiments. The negative result of these searches can also be interpreted to give a lower limit in the range 107 ÷108 sec to the characteristic time of the ΔB = 2 process of n — n oscillations. But this limit rests on nuclear model assumptions. Only one experiment has been carried out so far to search directly for free neutron-antineutron oscillations, using cold neutrons from the ILL Grenoble reactor [1].

Published
1989
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153. Neutron capture measurements on the s-process termination isotopes lead and bismuth

Author

Isabel Lopes, G. Cortes, Masayuki Igashira, P. Cennini, F. Gramegna, S. David, G. Tagliente, Costas G. Papadopoulos, M. Embid-Segura, Wiescher Michael, I. Duran, C. Lamboudis, J. L. Tain, C. Eleftheriadis, L. Sarchiapone, M. Mosconi, Rene Reifarth, Robert C. Haight, D. Karamanis, N. Patronis, C. Stephan, F. Gunsing, Andrea Venturi, Corrie S. Moreau, Carlos Guerrero, U. Abbondanno, R. Vlastou, L. Perrot, Thomas Rauscher, E. Berthoumieux, S. O'Brien, Michael Heil, Manuel Lozano, D. Karadimos, C. Rubbia, Heinz Oberhummer, E. Jericha, J. Salgado, A. Lindote, Roberto Capote, R. Terlizzi, P. Pavlopoulos, V. Chepel, M. C. Vincente, Isabel S. Gonçalves, G. Rudolf, A. Poch, S. Marrone, J. M. Quesada, L. Tassan-Got, E. González-Romero, M. Kerveno, W.I. Furman, P. Baumann, G. Aerts, J. Pancin, L. Ferrant, C. Carrapiço, A. Goverdovski, F. Alvarez-Velarde, L. Tavora, P.A. Assimakopoulos, Sara Bisterzo, V. Ketlerov, F. Calviño, H. Leeb, S. Isaev, Gerald Badurek, A. Pavlik, A. Herrera-Martinez, L. Fitzpatrick, C. Domingo-Pardo, C. A. Papachristodoulou, B. Haas, M. Oshima, D. Cano-Ott, R. Dolfini, Arnaud Ferrari, R. Ferreira Marques, A. Plukis, Y. Kadi, D. Villamarin, J. Andrzejewski, S. Walter, Alberto Mengoni, H. Frais-Koelbl, K. Wisshak, Iris Dillmann, F. Neves, I. Savvidis, F. Voss, P. M. Milazzo, Ralf Plag, P. Rullhusen, A. J. M. Plompen, G. Vannini, F. Becvar, E. Kossionides, C. Paradela, J. Marganiec, H. Wendler, P. E. Koehler, W. Dridi, L. Audouin, M. Dahlfors, S. Andriamonje, Nicola Colonna, P. Vaz, James L. Cox, Vasilis Vlachoudis, Aaron Couture, H. Alvarez-Pol, V. Konovalov, E. Chiaveri, F. Käppeler, E. Griesmayer, P. F. Mastinu, S. Lukic, M. Krtička, Roberto Gallino, K. Fujii, M. Rosetti, and C. Pretel

Subjects
Nuclear physics, Astrophysics and Astronomy, Neutron capture, Materials science, Lead (geology), Isotope, chemistry, chemistry.chemical_element, s-process, Bismuth

154. WARP: A double phase Argon programme for Dark Matter detection

Author

Gianpiero Mangano, Massimo Rossella, C. Rubbia, C. De Vecchi, M. Cambiaghi, A. Rappoldi, R. Dolfini, L. Grandi, C. Vignoli, M. Roncadelli, Alfredo G. Cocco, F. Carbonara, Alessandro Menegolli, Michele Prata, E. Calligarich, R. Santorelli, C. Montanari, Cristiano Galbiati, F. Cavanna, A. M. Szelc, O. Palamara, A. Ereditato, G.L. Raselli, G. Fiorillo, N. Ferrari, Calligarich, E., Cambiaghi, M., De Vecchi, C., Dolfini, R., Grandi, L., Menegolli, A., Montanari, C., Prata, M., Rappoldi, A., Raselli, G. L., Roncadelli, M., Rossella, M., Rubbia, C., Vignoli, C., Carbonara, F., Cocco†, Alfredo G., Ereditato, A., Fiorillo, Giuliana, Mangano, G., Santorelli, R., Cavanna, F., Ferrari, N., Palamara, O., Galbiati, C., and Szelc, A.

Subjects
Physics, Nuclear physics, Scintillation, Argon, chemistry, Ionization, Dark matter, Detector, Gamma ray, chemistry.chemical_element, Neutron, WIMP Argon Programme
Abstract

WARP (Wimp ARgon Programme) is a double phase Argon detector for Dark Matter detection under construction at Laboratori Nazionali del Gran Sasso. We present recent results obtained operating deep underground a prototype detector with sensitive mass 2.3 litres. 1. WARP: a double phase argon detector for Dark Matter detection. A double phase Argon detector offers unique sensitivity for the search of dark matter in the form of WIMPs: such detector has the highest discrimination of background events in favour of potential WIMP interactions, which are expected to produce low energy Ar recoils with typical energies of a few tens keV. The basic concept of the detector is the measurement of both the scintillation and the ionization produced by particle interactions inside a liquid argon sensitive volume. Two simultaneous criteria can be applied to select Ar recoils eventually produced by WIMPs: i) Prompt scintillation versus ionization. The prompt scintillation light produced by a particle interacting in the liquid argon phase is detected by PMs. The ionization electrons are extracted from the liquid into the gas and accelerated by an appropriate electric field to produce a proportional (high gain), secondary light pulse seen by the same PMs. The pulse ratio S2/S1 of secondary light S2 (from drift time-delayed ionization) over prompt scintillation light S1 is strongly dependent from columnar recombination of the ionising tracks: therefore nuclear recoils produce typical signals with pulse ratio S2/S1 about 60 times lower than electrons. ii) Pulse shape discrimination of primary scintillation: the primary light is emitted with two components with very large difference in decay times (fast 7 ns, and slow 1.8 μs). The relative amount of the slow component strongly depends from the interacting particle, being around 0.7 for electrons and. 0.1 for heavy charged paricles. The WARP liquid argon detector under construction has a sensitive volume of 100 liters. The goal scintillation yield is of the order of 1 collected photoelectron per keV and the detection threshold for the WIMPs 30 keV. A detailed description of the 100 liters detector can be find in reference [1]. 1 INFN and Dept. of Physics University of Pavia: P. Benetti, E. Calligarich, M. Cambiaghi, C. De Vecchi, R. Dolfini, L. Grandi, A. Menegolli, C. Montanari, M. Prata, A. Rappoldi, G.L. Raselli, M. Roncadelli, M. Rossella, C. Rubbia (Spokesperson), C. Vignoli. INFN and Dept. of Physics University of Napoli “Federico II”: F. Carbonara, A.G. Cocco, G. Fiorillo, G. Mangano, R. Santorelli. INFN Laboratori Nazionali del Gran Sasso and University of L’Aquila: F. Cavanna, N. Ferrari, O. Palamara,. L. Pandola. Princeton University, Physics Department: F. Calaprice, C. Galbiati, Y. Zhao. Institute of Nuclear Physics, Krakow : A. Szelc. Figure 1. Energy spectrum observed with the WARP 2.3 liters prototype in the LNGS underground laboratory inside a 10 cm thick Pb shielding. The overlapped red histogram is the expected (montecarlo-simulated) background by interactions of environmental gamma rays. The residual events below 650 keV are produced by Ar and Kr contaminations inside the liquid Argon. Figure 2. Residual energy spectrum after subtraction of the estimated background from environmental gamma rays. The residual spectrum (upper blue curve) is perfectly fitted by the sum of the beta spectra of Ar (green curve, end-point 565 keV, rate 1.1 Bq/litre) and Kr (red curve, end-point 687 keV, rate 0.5 Bq/litre). The vertical scale is expressed in counts/sec/keV. 2. The WARP 2.3 liters prototype detector In order to perfect the detection method, a 2.3 liters prototype detector is in operation at Laboratori Nazionali del Gran Sasso since February 2005. The detector has been equipped, in subsequent phases, with 2’’ and 3’’ PMs made of low background materials for an onsite detailed study of the backgrounds. The structure is a down-scaled version of the 100 liters detector, with field-shaping electrodes and gas to liquid extraction and acceleration grids. The chamber is filled with ultra-purified argon in order to allow for long drift times of free electrons. Purity is maintained stable by means of continuous argon recirculation. 2.1.1. Study of the β and γ detector backgrounds. The overall background of the 2.3 litres prototype installed underground inside a 10 cm thick Pb shielding has been carefully measured and identified. The total trigger rate above a threshold of 30 keV is about 5 Hz. From a detailed study of the energy spectrum shape (Figure 1) it is shown that about 2 Hz are produced by gamma ray interactions from radioactivity of materials surrounding the sensitive volume; the remaining 3 Hz are produced by the β decays of Kr and Ar dissolved in the liquid argon. In particular, the specific activity of Ar was found to be 1.1 ± 0.4 Bq/litre of liquid Argon, in very good agreement with ref. [2]. We notice that no particular care in the selection of materials was adopted, since in this test phase the background itself helps in the identification of the rejection power. Most of the backgrounds will be strongly reduced in the 100 litres setup. Figure 3. R-like events recorded with the 2.3 liters chamber during 13.4 days of live time in june 2005. The plot shows the primary signal energy (in keV) along the drift time, expressed in μs. The fiducial volume is defined by drift times between 10 and 35 microseconds. Figure 4. Energy distribution of R-like events inside the cathode (upper plot), and inside the fiducial volume (lower plot). The red histogram in the lower plot is the result of a simulation of the expected signal from environmental neutrons in the underground area. 2.1.2. Analysis of Recoil-like events. Data recorded during 13.4 days of live time in a run done in june 2005 have been analyzed looking for recoil-like events by applying the two selection criteria described in section 1. About 6.5 millions events have been processed. The spatial and energy distribution of the 580 selected R-like events (see Figure 3) suggests the following origin for the signals: i) R-like events in the cathode region are mostly induced by decays of Rn daughters. Rn is introduced in the chamber during the filling together with the Ar: being electrically neutral it is uniformly distributed inside the chamber. Daughter nuclei, produced into an ionized state, are drifted to the cathode by the electric field, where they stick. Subsequent decays may end up: (a) with the heavy ion entering the cathode and the α or β travelling in the LAr; (b) with the heavy ion travelling in the LAr and producing the observed R-like signal. The two peaks observed in the energy spectrum (Figure 4, upper plot) are coherently explained by the nuclear recoils from α decays Po Pb (ER=110 keV) and Po Bi (ER=144 keV), assuming a light yield of 0.7 photoelectrons/keV. ii) R-like events inside the fiducial volume are induced by environmental neutrons. Both the event rate and the shape of the energy spectrum (Figure 4, lower plot) are compatible with the expected interactions induced by environmental neutrons inside the underground area (represented by the red histogram). The WARP 2.3 liters chamber in operation at LNGS proofs that the double discrimination technique is effective for separation of recoil events. The first results of the 2.3 liters test (with no neutron shielding) show that the observed background is understood, and that recoil-like signals are compatible with the expected neutron background in the underground area. References [1] WARP proposal, available online at http://warp.pv.infn.it/proposal.pdf [2] H.H. Loosli and H. Oeschger, Earth and Plan. Sci. Lett. 7 (1969) 67

155. Improving the performance of the liquid argon TPC by doping with tetra-methyl-germanium

Author

David B. Cline, L. Mazzone, A. Gigli Berzolari, D. A. Scannicchio, S. Otwinowski, R. Dolfini, P. Boccaccio, Sandro Ventura, M. Verdecchia, S. Centro, S. Suzuki, G.L. Raselli, M. Negrini, C. De Vecchi, F. Cavanna, F. Pietropaolo, C. Rubbia, G. Piano Mortari, W.H. Tian, A. Pepato, Hui Wang, C. Montanari, E. Calligarich, F. Mauri, S. Motto, A. Rappoldi, P. Benetti, X. Li, D. Dzialo Giudice, L. Periale, Alessandro Bettini, F. Casagrande, J. P. Revol, P. Picchi, C. Vignoli, M. Zhou, A. Piazzoli, and P. Cennini

Subjects
Physics, chemistry.chemical_classification, Nuclear and High Energy Physics, biology, Physics::Instrumentation and Detectors, Doping, Analytical chemistry, chemistry.chemical_element, Charge (physics), Germanium, biology.organism_classification, Hydrocarbon, chemistry, Electric field, Liquid argon, Tetra, Physics::Chemical Physics, Atomic physics, Nuclear Experiment, Instrumentation
Abstract

In order to recover the charge lost by electron-ion recombination, we doped pure liquid argon with a photosensitive hydrocarbon, tetra-methyl-germanium (TMG), in the 3 ton ICARUS TPC. A charge increase of 25% to 220% was observed for different electric fields and for energy densities ranging from 1.6 to 32 MeV/cm.

156. ICARUS 600 ton: A status report

Author

F. Sergiampietri, F. Mauri, P. Cennini, L. Periale, Z. Xu, F. Carli, A. Ferrari, Paola Sala, F. Lu, R. Dolfini, T. Rancati, F. Arneodo, A. Gigli Berzolari, C. Vignoli, J. P. Revol, David B. Cline, C. Carpanese, Sandro Ventura, C. Rossi, I. De Mitri, C. Cinquini, A. Borio di Tigliole, P. Goudsmit, J. Ma, A. Rappoldi, F. Pietropaolo, P. Picchi, Chao Zhang, C. Rubbia, G. Piano-Mortari, D. Favaretto, R. Brunetti, Mario Terrani, A. Badertscher, L. Mazzone, Q. Zhang, G. Nurzia, André Rubbia, Donatella Cavalli, A. Bueno, S. Zheng, E. Barbieri, O. Palamara, P. Benetti, A. Piazzoli, M. Verdecchia, E. Calligarich, G. Xu, S. Centro, Alessandra Cesana, C. Montanari, S. Petrera, Shingo Suzuki, Hui Wang, J. Woo, K. He, F. Cavanna, Z. Li, Daniela Rebuzzi, Xiaojing Huang, G. Mannocchi, Massimo Rossella, M. Campanelli, D. Mazza, J. Rico, S. Otwinowski, A. Pepato, D. A. Scannicchio, D. Pascoli, Chang Chen, G.L. Raselli, and Yi-Chun Chen

Subjects
ICARUS, Nuclear and High Energy Physics, Engineering, business.industry, Detector, Electrical engineering, Modular design, Status report, Mechanical components, Atomic and Molecular Physics, and Optics, Advanced phase, Ton, Aerospace engineering, business, Realization (systems)
Abstract

The goal of the ICARUS Project is the installation of a multi-kiloton LAr TPC in the underground Gran Sasso Laboratory. The programme foresees the realization of the detector in a modular way. The first step is the construction of a 600 ton module which is now at an advanced phase. It will be mounted and tested in Pavia in one year and then it will be moved to Gran Sasso for the final operation. The major cryogenic and purification systems and the mechanical components of the detector have been constructed and tested in a 10 m3 prototype. The results of these tests are here summarized.

157. FLUKA simulations for low-energy neutron interactions and experimental validation

Author

Arnaud Ferrari, Mario Terrani, Paola Sala, R. Dolfini, A. Borio di Tigliole, G.L. Raselli, and Alessandra Cesana

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Detector, Monte Carlo method, Neutron source, Neutron detection, Neutron, Scintillator, Spectroscopy, Instrumentation, Neutron spectroscopy
Abstract

The response functions of a commercial neutron detector filled with BICRON BC501A liquid scintillator are computed using the FLUKA Monte Carlo program. The simulation results are necessary to perform a direct spectroscopy by unfolding the measured proton recoil spectrum by means of the response functions of the detector using the SAND II code. The measurement of the flux intensity and of the energy distribution of a calibrated AmBe neutron source validates the method showing a good agreement with the known quantities.

158. Recent results at n_TOF and future perspectives

Author

S. Marrone, U. Abbondanno, G. Aerts, H. Álvarez, F. Alvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulos, L. Audouin, G. Badurek, P. Baumann, F. Bec^vár, E. Berthoumieux, M. Calviani, F. Calviño, D. Cano-Ott, R. Capote, A. Carrillo de Albornoz, P. Cennini, V. Chepel, E. Chiaveri, N. Colonna, G. Cortes, A. Couture, J. Cox, M. Dahlfors, S. David, I. Dillmann, R. Dolfini, C. Domingo-Pardo, W. Dridi, I. Duran, C. Eleftheriadis, M. Embid-Segura, L. Ferrant, A. Ferrari, R. Ferreira-Marques, L. Fitzpatrick, H. Frais-Koelbl, K. Fujii, W. Furman, R. Gallino, I. Goncalves, E. Gonzalez-Romero, A. Goverdovski, F. Gramegna, E. Griesmayer, C. Guerrero, F. Gunsing, B. Haas, R. Haight, M. Heil, A. Herrera- Martinez, M. Igashira, S. Isaev, E. Jericha, Y. Kadi, F. Käppeler, D. Karamanis, D. Karadimos, M. Kerveno, V. Ketlerov, P. Koehler, V. Konovalov, E. Kossionides, M. Krtic^ka, C. Lamboudis, H. Leeb, A. Lindote, I. Lopes, M. Lozano, S. Lukic, J. Marganiec, L. Marques, C. Massimi, P. Mastinu, A. Mengoni, P. M. Milazzo, C. Moreau, M. Mosconi, F. Neves, H. Oberhummer, S. O'Brien, J. Pancin, C. Papachristodoulou, C. Papadopoulos, C. Paradela, N. Patronis, A. Pavlik, P. Pavlopoulos, L. Perrot, M. Pignatari, R. Plag, A. Plompen, A. Plukis, A. Poch, C. Pretel, J. Quesada, T. Rauscher, R. Reifarth, M. Rosetti, C. Rubbia, G. Rudolf, P. Rullhusen, J. Salgado, L. Sarchiapone, I. Savvidis, C. Stephan, G. Tagliente, J. L. Tain, L. Tassan-Got, L. Tavora, R. Terlizzi, G. Vannini, P. Vaz, A. Ventura, D. Villamarin, M. C. Vincente, V. Vlachoudis, R. Vlastou, F. Voss, S. Walter, H. Wendler, M. Wiescher, K. Wisshak, Roald Guandalini, Sara Palmerini, Maurizio Busso, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Pole Universitaire Leonard de Vinci, Pôle Universitaire Léonard de Vinci (PULV), Roald Guandalini, Sara Palmerini, Maurizio Busso, nTOF, and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
supernovae, Fission, Nuclear Theory, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Nuclear physics, 24.10.-i, 26.20.-f, 97.10.Cv, 97.10.Tk, 0202 electrical engineering, electronic engineering, information engineering, Nuclear astrophysics, Neutron, Nuclear Experiment, time of flight spectroscopy, Physics, stellar evolution, Large Hadron Collider, 020206 networking & telecommunications, Neutron capture, nuclear reactions and scattering, chemical analysis, neutron sources, Physics::Accelerator Physics, r-process, Neutron source, 020201 artificial intelligence & image processing, s-process
Abstract

International audience; The neutron Time-of-Flight facility at CERN has been used for a series of neutron capture and fission cross sections measurements. The facility, detectors and data analysis techniques are described, followed by a brief review of the capture results and of the preliminary results for selected fission cross sections. The problem of photon strength functions is discussed and preliminary first results are presented. All these subjects are discussed with respect to their implications in Nuclear Astrophysics. The last section is dedicated to the future perspectives concerning the next experimental campaign and the upgrade of the facility.

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159. Experimental challenges for the Re/Os clock

Author

L. Tavora, M. Krtička, Roberto Gallino, K. Wisshak, M. Dahlfors, G. Cortes, A. J. M. Plompen, M. Oshima, P. Vaz, J. Andrzejewski, I. Savvidis, P. Rullhusen, Aaron Couture, V. Konovalov, A. Goverdovski, Roberto Capote, P.A. Assimakopoulos, H. Wendler, James L. Cox, F. Alvarez-Velarde, A. Pavlik, F. Neves, W.I. Furman, P. Cennini, F. Voss, Gerald Badurek, F. Becvar, Wiescher Michael, P. M. Milazzo, S. David, A. Plukis, Andrea Venturi, R. Dolfini, Corrie S. Moreau, E. Kossionides, Isabel Lopes, C. A. Papachristodoulou, Nicola Colonna, M. Mosconi, G. Tagliente, S. Andriamonje, R. Vlastou, G. Vannini, E. Berthoumieux, Vasilis Vlachoudis, H. Alvarez-Pol, M. Rosetti, E. Chiaveri, Costas G. Papadopoulos, F. Käppeler, J. Marganiec, P. F. Mastinu, S. O'Brien, B. Haas, S. Lukic, Carlos Guerrero, J. Salgado, M. C. Vincente, U. Abbondanno, Iris Dillmann, F. Calviño, H. Leeb, A. Poch, A. Lindote, D. Cano-Ott, Heinz Oberhummer, C. Pretel, M. Embid-Segura, R. Terlizzi, E. Jericha, F. Gramegna, C. Eleftheriadis, S. Walter, Manuel Lozano, W. Dridi, Thomas Rauscher, Ralf Plag, Rene Reifarth, S. Isaev, J. Pancin, C. Carrapiço, C. Stephan, F. Gunsing, J. M. Quesada, Michael Heil, L. Tassan-Got, Masayuki Igashira, K. Fujii, D. Karadimos, E. González-Romero, César Domingo Pardo, C. Paradela, G. Aerts, D. Karamanis, N. Patronis, V. Ketlerov, L. Audouin, P. Pavlopoulos, L. Ferrant, L. Fitzpatrick, Y. Kadi, D. Villamarin, H. Frais-Koelbl, Sara Bisterzo, A. Herrera-Martinez, Arnaud Ferrari, R. Ferreira Marques, Alberto Mengoni, L. Sarchiapone, M. Kerveno, V. Chepel, G. Rudolf, P. Baumann, C. Lamboudis, J. L. Tain, Robert C. Haight, I. Duran, C. Rubbia, L. Perrot, Isabel S. Gonçalves, S. Marrone, P. E. Koehler, and E. Griesmayer

Subjects
Astrophysics and Astronomy, Chemistry

160. The 237Np(n,f) cross section at the CERN n-TOF facility

Author

R. C. Haight, A. Pavlik, C. Domingo-Pardo, C. Paradela, M. Oshima, M. Rosetti, S. Andriamonje, J. Andrzejewski, A. Goverdovski, Masayuki Igashira, Michael Wiescher, F. Alvarez-Velarde, C. Pretel, K. Wisshak, L. Audouin, F. Bečvář, R. Dolfini, Carlos Guerrero, U. Abbondanno, C. Eleftheriadis, V. Konovalov, H. Wendler, D. Karamanis, N. Patronis, S. Lukic, E. Chiaveri, C. Stephan, P. F. Mastinu, F. Gunsing, P. Vaz, F. Neves, P. M. Milazzo, A. Mengoni, Corrie S. Moreau, Aaron Couture, Heinz Oberhummer, A. Ventura, G. Aerts, M. Embid-Segura, G. Vannini, P. Cennini, V. Ketlerov, E. Berthoumieux, S. David, G. Tagliente, H. Álvarez, D. Cortina, Manuel Lozano, D. Cano-Ott, F. Voss, C. Lamboudis, J. L. Tain, M. C. Vincente, F. Calviño, H. Leeb, M. Diakaki, L. Ferrant, R. Gallino, B. Haas, A. Carrillo de Albornoz, L. Fitzpatrick, W.I. Furman, M. Mosconi, G. Badurek, A. J. M. Plompen, A. Lindote, J. Salgado, M. Kerveno, Vasilis Vlachoudis, A. Poch, Isabel Lopes, D. Villamarin, F. Gramegna, S. O'Brien, E. Jericha, W. Dridi, Rene Reifarth, A. Dorochenko, G. Cortes, Thomas Rauscher, J. Marganiec, C. A. Papachristodoulou, James L. Cox, A. Herrera-Martinez, J. M. Quesada, S. Isaev, L. Tassan-Got, E. Kossionides, Arnaud Ferrari, D. Kolokolov, Matthias Heil, J. Pancin, D. Karadimos, R. Terlizzi, Ralf Plag, J. Benlliure, Roberto Capote, P.A. Assimakopoulos, L. Tavora, K. Fujii, R. Vlastou, I. Savvidis, P. Rullhusen, E. González-Romero, C. T. Papadopoulos, Y. Kadi, C. Rubbia, H. Frais-Koelbl, Isabel S. Gonçalves, S. Marrone, L. Sarchiapone, M. Sedysheva, E. Griesmayer, P. E. Koehler, I. Duran, L. Perrot, F. Käppeler, P. Pavlopoulos, L. Marques, V. Chepel, G. Rudolf, N. Colonna, P. Baumann, A. Plukis, M. Krtička, R. Ferreira-Marques, Universitat Politècnica de Catalunya. Departament de Física, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group

Subjects
Nuclear reaction, Physics, Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, Fission, Física [Àrees temàtiques de la UPC], Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear physics, Neutron induced fission, Neutron, Neutron temperature, Uranium-238, CERN, Uranium-235, Neutron source, n_TOF, Física nuclear, Nuclear Experiment, Spallation Neutron Source
Abstract

The 237Np(n,f) cross sections have been measured at the n-TOF facility relative to the 235U and 238U fission cross sections. The n-TOF spallation neutron source at CERN is characterized by a high intensity flux, an excellent time resolution and an extensive neutron energy range (from eV to GeV). A fast ionization chamber was used as a fission fragment detector with efficiency better than 97%. Preliminary 237Np(n,f) cross sections have been deduced in the energy range from 20 keV to 10 MeV and are found in good agreement with data from literature.

161. A neural network approach for the TPC signal processing

Author

F. Pietropaolo, David B. Cline, S. Motto, C. Rubbia, P. Cennini, W.H. Tian, S. Otwinowski, F. Casagrande, M. Verdecchia, G.H. Wang, P. Boccaccio, A. Pepato, A. Rappoldi, S. Centro, M. Terrani, L. Periale, S. Suzuki, M. Negrini, Sandro Ventura, J. P. Revol, F. Mauri, C. De Vecchi, Alessandro Bettini, C. Montanari, A. Cesana, D. A. Scannicchio, Sergio Cittolin, X. Li, C. Vignoli, M. Zhou, F. Cavanna, A. Galli Tognota, P. Benetti, L. Mazzone, G. Piano Mortari, G.L. Raselli, D. Dzialo Giudice, E. Calligarich, R. Dolfini, A. Piazzoli, P. Picchi, and A. Gigli Berzolari

Subjects
Physics, Nuclear and High Energy Physics, Signal processing, Data processing, Time projection chamber, Artificial neural network, Physics::Instrumentation and Detectors, Time delay neural network, Real-time computing, Detector, Information processing, Physical information, Detectors and Experimental Techniques, Instrumentation
Abstract

Artificial neural networks may in some cases be alternatives to programmed computing. Since they offer a new important approach to information processing, we have investigated if the accuracy offered by this technique is good enough to extract physical information from the signals coming from a liquid argon time projection chamber. The results obtained implementing a neural network algorithm on a sequential scalar computer have been compared to those of a standard best-fit procedure on the same machine. This new method appears to be suited for the analysis of the events occurring in a very large detector, as that foreseen for the ICARUS experiment.

162. A low-mass neutron flux monitor for the n_TOF facility at CERN

Author

S. David, G. Tagliente, G. Vannini, F. Käppeler, E. Savvidis, F. Rejmund, M. Terrani, V. Chepel, L. Ferrant, A. Lindote, D. Karamanis, P. Baumann, T. Papaevangelou, E. Chiaveri, Per Carlson, A. Perez-Parra, P. E. Koehler, P. F. Mastinu, Corrie S. Moreau, J. Salgado, V. Peskov, B. Berthier, A. Poch, M. Loriggiola, S. Andriamonje, J.C. Soares, G. Cortes, C. Borcea, C. Eleftheriadis, M. Embid-Segura, M. Vincente-Vincente, W.I. Furman, H. Leeb, A. Goverdovski, E. Mínguez, F. Neves, L. Ferreira-Lourenco, Y. Kadi, D. Villamarin-Fernandez, H. Frais-Koelbl, V. Lacoste, P. M. Milazzo, D. Cortina, Manuel Lozano, Gerald Badurek, A. Angelopoulos, Roberto Capote, P.A. Assimakopoulos, F. Voss, F. Becvar, I. Duran, N. Tsangas, M. Rosetti, R. C. Haight, Nicola Colonna, K. Wisshak, H. Álvarez, J. L. Tain, L. Zanini, E. Jericha, Thomas Rauscher, C. Paradela, Vasilis Vlachoudis, R. Dolfini, M.I. Lopes, R. Ferreira-Marques, R. Vlastou, H. Beer, L. Perrot, C. Tapia, I. F. Gonçalves, H. Wendler, K.G. Ioannides, F. Gramegna, Saed Dababneh, George Kitis, E. Kossionides, F. Gunsing, E. Boscolo-Marchi, Sigfrido Boffi, Michael Wiescher, A. Ventura, D. Cano-Ott, E. Gonzalez-Romero, Y. Giomataris, Ralf Plag, J. Benlliure, Marco Radici, N. Janeva, C. Rubbia, P. Pavlopoulos, Ch.O. Bacri, A. Plukis, E. Griesmayer, A.J.P.L. Policarpo, Subramanian Raman, S. Lukic, N. Bustreo, S. Marrone, A. J. M. Plompen, José M. Martínez-Val, U. Abbondanno, José Manuel Perlado, Heinz Oberhummer, G. Rudolf, W. Rapp, Michael Heil, P. Calviño, E. Berthomieux, V. Konovalov, C. Pretel, James L. Cox, V. Ketlerov, G. Aerts, P. Cennini, A. Herrera-Martinez, Arnaud Ferrari, C. Stephan, S. O'Brien, Alberto Mengoni, R. Terlizzi, A. Molina-Coballes, L. Tavora, P. Rullhusen, J. Pancin, S. Markov, S. Marigo, M. Dahlfors, P. Vaz, Aaron Couture, A. Pavlik, C. Domingo-Pardo, Rene Reifarth, A. Kelic, J. M. Quesada, L. Tassan-Got, C. Coceva, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and TOF

Subjects
TheoryofComputation_COMPUTATIONBYABSTRACTDEVICES, Silicon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, ComputingMethodologies_ARTIFICIALINTELLIGENCE, Nuclear physics, 0103 physical sciences, Neutron, 010306 general physics, Nuclear Experiment, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Scattering, Detector, TheoryofComputation_GENERAL, Neutron radiation, Neutron capture, ComputingMethodologies_PATTERNRECOGNITION, chemistry, Physics::Accelerator Physics, Low Mass
Abstract

A small-mass system has been developed for monitoring the flux of neutrons with energy up to 1 MeV at the new time-of-flight facility at CERN, n_TOF. The monitor is based on a thin Mylar foil with a 6Li deposit, placed in the neutron beam, and an array of Silicon detectors, placed outside the beam, for detecting the products of the 6Li(n, alpha)³H reaction. The small amount of material on the beam ensures a minimal perturbation of the flux and minimizes the background related to scattered neutrons. Moreover, a further reduction of the gamma-ray background has been obtained by constructing the scattering chamber hosting the device in carbon fibre. A detailed description of the flux monitor is here presented, together with the characteristics of the device, in terms of efficiency, resolution and induced background. The use of the monitor in the measurement of neutron capture cross-sections at n_TOF is discussed

163. ICARUS at FNAL

Author

Maurizio Bonesini, C. M. Sutera, G. Mannocchi, B. Baibussinov, P. Picchi, Paola Sala, M. Haranczyk, J. Lagoda, F. Boffelli, C. Rubbia, R. Sulej, J. Holeczek, A. G. Cocco, X. Yang, E. Segreto, A. Curioni, R. Dolfini, I. Kochanek, E. Calligarich, D. Gibin, Andrea Zani, G. Meng, F. Noto, K. Zaremba, A. Guglielmi, C. Vignoli, V. A. Matveev, Mikhail Kirsanov, R. G. Van de Water, M. Rossella, Halina Bilokon, Christian Farnese, David B. Cline, K. Cieslik, A. Dermenev, P. Plonski, F. Varanini, Hui Wang, V. Bellini, A. Falcone, Alessandro Menegolli, M. Torti, S. Mania, Jan Kisiel, F. Pietropaolo, C. Montanari, T. J. Palczewski, G. B. Mills, S. Otwinowski, Alexander Kurepin, J. Stepaniak, F. Mammoliti, A. Ivashkin, D. Tlisov, G.L. Raselli, A. Scaramelli, Angela Fava, S. Centro, M. Antonello, Renato Potenza, A. Ferrari, D. Stefan, Sergei Gninenko, F.F. Guber, Sandro Ventura, and A. Rappoldi

Subjects
ICARUS, Physics, Large Hadron Collider, Physics - Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Neutrino beam, NuMI, Nuclear physics, High Energy Physics - Phenomenology, Upgrade, High Energy Physics - Phenomenology (hep-ph), Fermilab, Neutrino, Detectors and Experimental Techniques
Abstract

The INFN and the ICARUS collaboration originally developed the technology of the LAr-TPC. Located the underground LNGS Hall-B, the ICARUS T600 detector has been performed over three years with remarkable detection efficiency featuring a smooth operation, high live time, and high reliability. About 3000 CNGS neutrino events have been collected and are being actively analyzed. ICARUS will now be moved to CERN for an extensive R&D program. The T600 detector will be overhauled and complemented with a similar T150 detector. These improvements are performed in collaboration with the LBNE experiment, of which several INFN Institutions are now members. As a novelty, a SC magnetic field of about 1 T will be introduced. During 2016 it is proposed to move the experiment to FNAL where short base line neutrino beams are available, complementing the approved MicroBooNe experiment which will start operation in 2014. The ICARUS detectors at FNAL will be an important addition since, in absence of anomalies, the signals of several detectors at different distances from the target should be a copy of each other for all experimental signatures. Due to the reduced mass, in MicroBooNE the anti-neutrino signal is too weak for a sensitive comparison. Hence, a definitive clarification of the LSND anomaly requires the exploration of the anti-neutrino signal provided by the much larger T600. The magnetic field will allow separating the anti-neutrino signal from the neutrino-induced background. It is proposed to expose the T600 at the Booster NuBeam at ~700 m from target; the T150 will be located at ~150 m. The T600 will also receive >10^4 nu_e events/year from the off-axis NUMI beam peaked around 1 GeV and exploitable to prepare for the LBNE experiment. The ICARUS teams are also interested in extending the participation to other short baseline neutrino activities collaborating with existing FNAL groups., Experiment Proposal; 54 pages, 33 figures

164. Experimental observation of an extremely high electron lifetime with the ICARUS-T600 LAr-TPC

Author

Antonello, M., Baibussinov, B., Benetti, P., Boffelli, F., Bubak, Arkadiusz, Calligarich, E., Centro, S., Cesana, A., Cieślik, K., Cline, D. B., Cocco, A. G., Dabrowska, A., Dequal, D., Dermenev, A., Dolfini, R., Falcone, A., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Gibin, D., Gninenko, S., Guglielmi, A., Haranczyk, M., Holeczek, Jacek, Kirsanov, M., Kisiel, Jan, Kochanek, Izabela, Lagoda, J., Mania, Sławomir, Menegolli, A., Meng, G., Montanari, C., Nicoletto, M., Otwinowski, S., Picchi, P., Pietropaolo, F., Płoński, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scaramelli, A., Segreto, E., Sergiampietri, F., Stefan, D., Sulej, R., Szarska, M., Terrani, M., Torti, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H., Yang, X., Zalewska, A., Zani, A., Zaremba, K., M., Antonello, B., Baibussinov, P., Benetti, F., Boffelli, A., Bubak, E., Calligarich, S., Centro, A., Cesana, K., Cieślik, D., Cline, A., Cocco, A., Dabrowska, A., Dermenev, R., Dolfini, A., Falcone, C., Farnese, A., Fava, A., Ferrari, Fiorillo, Giuliana, D., Gibin, S., Gninenko, A., Guglielmi, M., Haranczyk, J., Holeczek, M., Kirsanov, J., Kisiel, I., Kochanek, J., Lagoda, S., Mania, A., Menegolli, G., Meng, C., Montanari, S., Otwinowski, P., Picchi, F., Pietropaolo, P., Plonski, A., Rappoldi, G. L., Raselli, M., Rossella, C., Rubbia, P. R., Sala, A., Scaramelli, E., Segreto, F., Sergiampietri, D., Stefan, R., Sulej, M., Szarska, M., Terrani, M., Torti, F., Varanini, S., Ventura, C., Vignoli, H., Wang, X., Yang, A., Zalewska, A., Zani, K., Zaremba, Antonello, M, Baibussinov, B, Benetti, P, Boffelli, F, Bubak, A, Calligarich, E, Centro, S, Cesana, A, Cieslik, K, Cline, D, Cocco, A, Dabrowska, A, Dermenev, A, Dolfini, R, Falcone, A, Farnese, C, Fava, A, Ferrari, A, Fiorillo, G, Gibin, D, Gninenko, S, Guglielmi, A, Haranczyk, M, Holeczek, J, Kirsanov, M, Kisiel, J, Kochanek, I, Lagoda, J, Mania, S, Menegolli, A, Meng, G, Montanari, C, Otwinowski, S, Picchi, P, Pietropaolo, F, Plonski, P, Rappoldi, A, Raselli, G, Rossella, M, Rubbia, C, Sala, P, Scaramelli, A, Segreto, E, Sergiampietri, F, Stefan, D, Sulej, R, Szarska, M, Terrani, M, Torti, M, Varanini, F, Ventura, S, Vignoli, C, Wang, H, Yang, X, Zalewska, A, Zani, A, and Zaremba, K

Subjects
ICARUS, Physics - Instrumentation and Detectors, Time projection chamber, Argon, Materials science, Detector, Cryogenic detector, chemistry.chemical_element, FOS: Physical sciences, Electron, Instrumentation and Detectors (physics.ins-det), Particle detector, Neutrino detector, Nuclear physics, chemistry, Ionization, cryogenic detectors, time projection chambers, Detectors and Experimental Techniques, Instrumentation, Mathematical Physics, charge transport and multiplication in liquid media, neutrino detectors
Abstract

The ICARUS T600 detector, the largest liquid Argon Time Projection Chamber (LAr-TPC) realized after many years of RD activities, was installed and successfully operated for 3 years at the INFN Gran Sasso underground Laboratory. One of the most important issues was the need of an extremely low residual electronegative impurity content in the liquid Argon, in order to transport the free electrons created by the ionizing particles with a very small attenuation along the drift path. The solutions adopted for the Argon re-circulation and purification systems have permitted to reach impressive results in terms of Argon purity and a free electron lifetime exceeding 15 ms, corresponding to about 20 parts per trillion of equivalent O2 contamination, a milestone for any future project involving LAr-TPC's and the development of higher detector mass scales., Comment: to be submitted to JINST, LaTeX version

Published
2014

165. Precision measurement of the neutrino velocity with the ICARUS detector in the CNGS beam

Author

Antonello, M., Baibussinov, B., Benetti, P., Boffelli, F., Calligarich, E., Canci, N., Centro, S., Cesana, A., Cieslik, K., Cline, D. B., Cocco, A. G., Dabrowska, A., Dequal, D., Dermenev, A., Dolfini, R., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Gibin, D., Gninenko, S., Guglielmi, A., Haranczyk, M., Holeczek, J., Ivashkin, A., Kisiel, J., Kochanek, I., Lagoda, J., Mania, S., Menegolli, A., Meng, G., Montanari, C., Otwinowski, S., Piazzoli, A., Picchi, P., Pietropaolo, F., Plonski, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scantamburlo, E., Scaramelli, A., Segreto, E., Sergiampietri, F., Stefan, D., Stepaniak, J., Sulej, R., Szarska, M., Terrani, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H. G., Yang, X., Zalewska, A., Zani, A., Zaremba, K., Alvarez Sanchez, P., Biagi, L., Barzaghi, R., Betti, B., Bernier, L.-G., Cerretto, G., De Gaetani, C., Esteban, H., Feldmann, T., Gonzalez Cobas, J. D., Passoni, D., Pettiti, V., Pinto, L., Serrano, J., Spinnato, P., Visconti, M. G., Wlostowski, T., M., Antonello, B., Baibussinov, P., Benetti, F., Boffelli, E., Calligarich, N., Canci, S., Centro, A., Cesana, K., Cieslik, D. B., Cline, A. G., Cocco, A., Dabrowska, D., Dequal, A., Dermenev, R., Dolfini, C., Farnese, A., Fava, A., Ferrari, Fiorillo, Giuliana, D., Gibin, S., Gninenko, A., Guglielmi, M., Haranczyk, J., Holeczek, A., Ivashkin, J., Kisiel, I., Kochanek, J., Lagoda, S., Mania, A., Menegolli, G., Meng, C., Montanari, S., Otwinowski, A., Piazzoli, P., Picchi, F., Pietropaolo, P., Plonski, A., Rappoldi, G. L., Raselli, M., Rossella, C., Rubbia, P., Sala, E., Scantamburlo, A., Scaramelli, E., Segreto, F., Sergiampietri, D., Stefan, J., Stepaniak, R., Sulej, M., Szarska, M., Terrani, F., Varanini, S., Ventura, C., Vignoli, H. G., Wang, X., Yang, A., Zalewska, A., Zani, K., Zaremba, P., Alvarez Sanchez, L., Biagi, R., Barzaghi, B., Betti, L. G., Bernier, G., Cerretto, C., Gaetani, H., Esteban, T., Feldmann, J. D., Gonzalez Coba, D., Passoni, V., Pettiti, L., Pinto, J., Serrano, P., Spinnato, M. G., Visconti, and T., Wlostowski

Subjects
ICARUS, Physics, Neutrino Detectors and Telescopes, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Proton, Physics::Instrumentation and Detectors, Detector, FOS: Physical sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Time of flight, Bunches, Neutrino Detectors, Physics::Accelerator Physics, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Particle Physics - Experiment, Beam (structure), Telescopes
Abstract

During May 2012, the CERN-CNGS neutrino beam has been operated for two weeks for a total of 1.8 10^17 pot in bunched mode, with a 3 ns narrow width proton beam bunches, separated by 100 ns. This tightly bunched beam structure allows a very accurate time of flight measurement of neutrinos from CERN to LNGS on an event-by-event basis. Both the ICARUS-T600 PMT-DAQ and the CERN-LNGS timing synchronization have been substantially improved for this campaign, taking ad-vantage of additional independent GPS receivers, both at CERN and LNGS as well as of the deployment of the "White Rabbit" protocol both at CERN and LNGS. The ICARUS-T600 detector has collected 25 beam-associated events; the corresponding time of flight has been accurately evaluated, using all different time synchronization paths. The measured neutrino time of flight is compatible with the arrival of all events with speed equivalent to the one of light: the difference between the expected value based on the speed of light and the measured value is tof_c - tof_nu = (0.10 \pm 0.67stat. \pm 2.39syst.) ns. This result is in agreement with the value previously reported by the ICARUS collaboration, tof_c - tof_nu = (0.3 \pm 4.9stat. \pm 9.0syst.) ns, but with improved statistical and systematic errors., Comment: 21 pages, 13 figures, 1 table

Published
2012
Full Text
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166. Measurement of the 236U(n,f) cross section from 170 meV to 2 MeV at the CERN n_TOF facility

Author

Sarmento, R., Calviani, M., Praena, J., Colonna, N., Belloni, F., F. Gonçalves, I., Vaz, P., Aerts, G., Alvarez, H., Alvarez-Velarde, F., Andriamonje, S., Andrzejewski, J., Assimakopoulos, P., Audouin, L., Barbagallo, M., Badurek, G., Baumann, P., Becvar, F., Berthoumieux, E., Calvino, F., Cano-Ott, D., Capote, R., Carrapiço, C., Carrillo De Albornoz, A., Cennini, P., Chepel, V., Chiaveri, E., Cortes, G., Couture, A., Cox, J., Dahlfors, M., David, S., Diakaki, M., Dillmann, I., Dolfini, R., Domingo-Pardo, C., Dridi, W., Duran, I., Eleftheriadis, C., Ferrant, L., Ferrari, Anthony, Ferreira-Marques, R., Frais-Koelbl, H., Fuji, K., Furman, W., Gonzalez-Romero, E., Goverdovski, A., Gramegna, F., Griesmayer, E., Guerrero, C., Gunsing, F., Haas, B., Haight, R., Heil, M., Herrera-Martinez, A., Igashira, M., Isaev, S., Jericha, E., Käppeler, F., Kadi, Y., Karadimos, D., Karamanis, D., Kerveno, M., Ketlerov, V., Koehler, P., Konovalov, V., Kossionides, E., Krticka, M., Lampoudis, C., Lederer, C., Leeb, H., Lindote, A., Lopes, I., Lozano, M., Lukic, S., Marganiec, J., Marques, L., Marrone, S., Martinez, T., Massimi, C., Mastinu, P., Mendoza, E., Mengoni, A., M. Milazzo, P., Moreau, C., Mosconi, M., Neves, F., Oberhummer, H., O'Brien, S., Oshima, M., Pancin, J., Papachristodoulou, C., Papadopoulos, C., Paradela, C., Patronis, N., Pavlik, A., Pavlopoulos, P., Perrot, L., T. Pigni, M., Plag, R., Plompen, A., Plukis, A., Poch, A., Pretel, C., Quesada, J., Rauscher, T., Reifarth, R., Rosetti, M., Rubbia, C., Rudolf, G., Rullhusen, P., Salgado, J., Sarchiapone, L., Savvidis, I., Stephan, C., Tagliente, G., L. Tain, J., Tarrio, D., Tassan-Got, L., Tavora, L., Terlizzi, R., Vannini, G., Ventura, A., Villamarin, D., C. Vicente, M., Vlachoudis, V., Vlastou, R., Voss, F., Walter, S., Wendler, H., Wiescher, M., Wisshak, K., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département Recherches Subatomiques (DRS-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Aval du cycle et Energie Nucléaire (ACEN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Pôle Universitaire Léonard de Vinci, Pôle Universitaire Léonard de Vinci (PULV), nTOF, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), R. Sarmento, M. Calviani, J. Praena, N. Colonna, F. Belloni, I. F. Gonçalve, P. Vaz, G. Aert, H. Alvarez, F. Alvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulo, L. Audouin, M. Barbagallo, G. Badurek, P. Baumann, F. Becvar, E. Berthoumieux, F. Calvino, D. Cano-Ott, R. Capote, C. Carrapiço, A. Carrillo de Albornoz, P. Cennini, V. Chepel, E. Chiaveri, G. Corte, A. Couture, J. Cox, M. Dahlfor, S. David, M. Diakaki, I. Dillmann, R. Dolfini, C. Domingo-Pardo, W. Dridi, I. Duran, C. Eleftheriadi, L. Ferrant, A. Ferrari, R. Ferreira-Marque, H. Frais-Koelbl, K. Fuji, W. Furman, E. Gonzalez-Romero, A. Goverdovski, F. Gramegna, E. Griesmayer, C. Guerrero, F. Gunsing, B. Haa, R. Haight, M. Heil, A. Herrera-Martinez, M. Igashira, S. Isaev, E. Jericha, F. Käppeler, Y. Kadi, D. Karadimo, D. Karamani, M. Kerveno, V. Ketlerov, P. Koehler, V. Konovalov, E. Kossionide, M. Krticka, C. Lampoudi, C. Lederer, H. Leeb, A. Lindote, I. Lope, M. Lozano, S. Lukic, J. Marganiec, L. Marque, S. Marrone, T. Martinez, C. Massimi, P. Mastinu, E. Mendoza, A. Mengoni, P. M. Milazzo, C. Moreau, M. Mosconi, F. Neve, H. Oberhummer, S. O’Brien, M. Oshima, J. Pancin, C. Papachristodoulou, C. Papadopoulo, C. Paradela, N. Patroni, A. Pavlik, P. Pavlopoulo, L. Perrot, M. T. Pigni, R. Plag, A. Plompen, A. Pluki, A. Poch, C. Pretel, J. Quesada, T. Rauscher, R. Reifarth, M. Rosetti, C. Rubbia, G. Rudolf, P. Rullhusen, J. Salgado, L. Sarchiapone, I. Savvidi, C. Stephan, G. Tagliente, J. L. Tain, D. Tarrio, L. Tassan-Got, L. Tavora, R. Terlizzi, G. Vannini, A. Ventura, D. Villamarin, M. C. Vicente, V. Vlachoudi, R. Vlastou, F. Vo, S. Walter, H. Wendler, M. Wiescher, and K. Wisshak

Subjects
NEUTRON TIME-OF-FLIGHT, Nuclear Theory, neutron-induced fission cross section, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, EMERGING NUCLEAR TECHNOLOGIES
Abstract

The neutron-induced fission cross section of 236U was measured at the neutron Time-of-Flight (n_TOF) facility at CERN relative to the standard 235U(n,f) cross section for neutron energies ranging from above thermal to several MeV. The measurement, covering the full range simultaneously, was performed with a fast ionization chamber, taking advantage of the high resolution of the n_TOF spectrometer. The n_TOF results confirm that the first resonance at 5.45 eV is largely overestimated in some nuclear data libraries. The resonance triplet around 1.2 keV was measured with high resolution and resonance parameters were determined with good accuracy. Resonances at high energy have also been observed and characterized and different values for the cross section are provided for the region between 10 keV and the fission threshold. The present work indicates various shortcomings of the current nuclear data libraries in the subthreshold region and provides the basis for an accurate re-evaluation of the 236U(n,f) cross section, which is of great relevance for the development of emerging or innovative nuclear reactor technologies.

Published
2011
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167. Measurement of the neutron capture cross section of the s-only isotope 204Pb from 1 eV to 440 keV

Author

DOMINGO-PARDO, C., ABBONDANNO, U., AERTS, G., ÁLVAREZ-POL, H., ALVAREZ-VELARDE, F., ANDRIAMONJE, S., ANDRZEJEWSKI, J., ASSIMAKOPOULOS, P., AUDOUIN, L., BADUREK, G., BAUMANN, P., BE&#269VÁ, F., BERTHOUMIEUX, E., BISTERZO, S., CALVIÑO, F., CANO-OTT, D., CAPOTE, R., CARRAPIÇO, C., CENNINI, P., CHEPEL, V., CHIAVERI, E., COLONNA, N., CORTES, G., COUTURE, A., COX, J., DAHLFORS, M., DAVID, S., DILLMANN, I., DOLFINI, R., DRIDI, W., DURAN, I., ELEFTHERIADIS, C., EMBID-SEGURA, M., FERRANT, L., FERRARI, Anthony, FERREIRA-MARQUES, R., FITZPATRICK, L., FRAIS-KOELBL, H., FUJII, K., FURMAN, W., GALLINO, R., GONCALVES, I., GONZALEZ-ROMERO, E., GOVERDOVSKI, A., GRAMEGNA, F., GRIESMAYER, E., GUERRERO, C., GUNSING, F., HAAS, B., HAIGHT, R., HEIL, M., HERRERA-MARTINEZ, A., IGASHIRA, M., ISAEV, S., JERICHA, E., KADI, Y., KÄPPELER, F., KARAMANIS, D., KARADIMOS, D., KERVENO, M., KETLEROV, V., KOEHLER, P., KONOVALOV, V., KOSSIONIDES, E., KRTIČKA, M., LAMBOUDIS, C., LEEB, H., LINDOTE, A., LOPES, I., LOZANO, M., LUKIC, S., MARGANIEC, J., MARRONE, S., MASTINU, P., MENGONI, A., M. MILAZZO, P., MOREAU, C., MOSCONI, M., NEVES, F., OBERHUMMER, H., OSHIMA, M., O'BRIEN, S., PANCIN, J., PAPACHRISTODOULOU, C., PAPADOPOULOS, C., PARADELA, C., PATRONIS, N., PAVLIK, A., PAVLOPOULOS, P., PERROT, L., PLAG, R., PLOMPEN, A., PLUKIS, A., POCH, A., PRETEL, C., QUESADA, J., RAUSCHER, T., REIFARTH, R., ROSETTI, M., RUBBIA, C., RUDOLF, G., RULLHUSEN, P., SALGADO, J., SARCHIAPONE, L., SAVVIDIS, I., STEPHAN, C., TAGLIENTE, G., L. TAIN, J., TASSAN-GOT, L., TAVORA, L., TERLIZZI, R., VANNINI, G., VAZ, P., VENTURA, A., VILLAMARIN, D., VINCENTE, M.C., VLACHOUDIS, V., VLASTOU, R., VOSS, F., WALTER, S., WENDLER, H., WIESCHER, M., WISSHAK, K., C. Domingo-Pardo, U. Abbondanno, G. Aert, H. Álvarez-Pol, F. Alvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulo, L. Audouin, G. Badurek, P. Baumann, F. Becvár, E. Berthoumieux, S. Bisterzo, F. Calviño, D. Cano-Ott, R. Capote, C. Carrapiço, P. Cennini, V. Chepel, E. Chiaveri, N. Colonna, G. Corte, A. Couture, J. Cox, M. Dahlfor, S. David, I. Dillman, R. Dolfini, W. Dridi, I. Duran, C. Eleftheriadi, M. Embid-Segura, L. Ferrant, A. Ferrari, R. Ferreira-Marque, L. Fitzpatrick, H. Frais-Koelbl, K. Fujii, W. Furman, R. Gallino, I. Goncalve, E. Gonzalez-Romero, A. Goverdovski, F. Gramegna, E. Griesmayer, C. Guerrero, F. Gunsing, B. Haa, R. Haight, M. Heil, A. Herrera-Martinez, M. Igashira, S. Isaev, E. Jericha, Y. Kadi, F. Käppeler, D. Karamani, D. Karadimo, M. Kerveno, V. Ketlerov, P. Koehler, V. Konovalov, E. Kossionide, M. Krtička, C. Lamboudi, H. Leeb, A. Lindote, I. Lope, M. Lozano, S. Lukic, J. Marganiec, S. Marrone, P. Mastinu, A. Mengoni, P. M. Milazzo, C. Moreau, M. Mosconi, F. Neve, H. Oberhummer, M. Oshima, S. O'Brien, J. Pancin, C. Papachristodoulou, C. Papadopoulo, C. Paradela, N. Patroni, A. Pavlik, P. Pavlopoulo, L. Perrot, R. Plag, A. Plompen, A. Pluki, A. Poch, C. Pretel, J. Quesada, T. Rauscher, R. Reifarth, M. Rosetti, C. Rubbia, G. Rudolf, P. Rullhusen, J. Salgado, L. Sarchiapone, I. Savvidi, C. Stephan, G. Tagliente, J. L. Tain, L. Tassan-Got, L. Tavora, R. Terlizzi, G. Vannini, P. Vaz, A. Ventura, D. Villamarin, M. C. Vincente, V. Vlachoudi, R. Vlastou, F. Vo, S. Walter, H. Wendler, M. Wiescher, K. Wisshak(n_TOF Collaboration), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), nTOF, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
25.40.Lw, 27.80.+w, 97.10.Cv, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], NEUTRON TIME OF FLIGHT, Nuclear Experiment, S-PROCESS, NEUTRON CAPTURE CROSS SECTION
Abstract

The neutron capture cross section of 204Pb has been measured at the CERN n_TOF installation with high resolution in the energy range from 1 eV to 440 keV. An R-matrix analysis of the resolved resonance region, between 1 eV and 100 keV, was carried out using the SAMMY code. In the interval between 100 keV and 440 keV we report the average capture cross section. The background in the entire neutron energy range could be reliably determined from the measurement of a 208Pb sample. Other systematic effects in this measurement could be investigated and precisely corrected by means of detailed Monte Carlo simulations. We obtain a Maxwellian average capture cross section for 204Pb at kT=30 keV of 79(3) mb, in agreement with previous experiments. However our cross section at kT=5 keV is about 35% larger than the values reported so far. The implications of the new cross section for the s-process abundance contributions in the Pb/Bi region are discussed., Comment: 8 pages, 3 figures, article submitted to Phys. Rev. C

Published
2007
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168. Performance of a Liquid Argon Time Projection Chamber exposed to the WANF Neutrino Beam

Author

Arneodo, F., Benetti, P., Bonesini, M., di Tigliole, A.Borio, Boschetti, B., Bueno, A., Calligarich, E., Casagrande, F., Cavalli, D., Cavanna, F., Cennini, P., Centro, S., Cesana, E., Cline, D., Curioni, A., De Mitri, I., De Vecchi, C., Dolfini, R., Ferrari, A., Ghezzi, A., Guglielmi, A., Kisiel, J., Mannocchi, G., de la Ossa, A.Martinez, Matthey, C., Mauri, F., Montanari, C., Navas, S., Negri, P., Nicoletto, M., Otwinowski, S., Paganoni, M., Palamara, O., Pepato, A., Periale, L., Mortari, G.Piano, Picchi, P., Pietropaolo, F., Puccini, A., Pullia, A., Ragazzi, S., Rancati, T., Rappoldi, A., Raselli, G.L., Redaelli, N., Rondio, E., Rubbia, A., Rubbia, C., Sala, P.R., Sergiampietri, F., Sobczyk, J., Suzuki, S., de Fatis, T.Tabarelli, Terrani, M., Terranova, F., Tonazzo, A., Ventura, S., Vignoli, C., Wang, H., Zalewska, A., F., Arneodo, P., Benetti, M., Bonesini, A., Borio di Tigliole, B., Boschetti, A., Bueno, E., Calligarich, F., Casagrande, D., Cavalli, F., Cavanna, P., Cennini, S., Centro, E., Cesana, D., Cline, A., Curioni, DE MITRI, Ivan, C., De Vecchi, R., Dolfini, A., Ferrari, A., Ghezzi, A., Guglielmi, J., Kisiel, G., Mannocchi, A., Martı´nez de la Ossa, C., Matthey, F., Mauri, C., Montanari, S., Nava, P., Negri, M., Nicoletto, S., Otwinowski, M., Paganoni, O., Palamara, A., Pepato, L., Periale, G., Piano Mortari, P., Picchi, F., Pietropaolo, A., Puccini, A., Pullia, S., Ragazzi, T., Rancati, A., Rappoldi, G. L., Raselli, N., Redaelli, E., Rondio, A., Rubbia, C., Rubbia, P. R., Sala, F., Sergiampietri, J., Sobczyk, S., Suzuki, T., Tabarelli de Fati, M., Terrani, F., Terranova, A., Tonazzo, S., Ventura, C., Vignoli, H., Wang, and A., Zalewska

Subjects
Physics::Instrumentation and Detectors, Neutrino interactions, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Other Fields of Physics, Physics::Accelerator Physics, High Energy Physics::Experiment
Abstract

We present the results of the first exposure of a Liquid Argon TPC to a multi-GeV neutrino beam. The data have been collected with a 50 liters ICARUS-like chamber located between the CHORUS and NOMAD experiments at the CERN West Area Neutrino Facility (WANF). We discuss both the instrumental performance of the detector and its capability to identify and reconstruct low multiplicity neutrino interactions. We present the results of the first exposure of a Liquid Argon TPC to a multi-GeV neutrino beam. The data have been collected with a 50 liters ICARUS-like chamber located between the CHORUS and NOMAD experiments at the CERN West Area Neutrino Facility (WANF). We discuss both the instrumental performance of the detector and its capability to identify and reconstruct low multiplicity neutrino interactions.

Published
2006

169. Measurement of the neutrino velocity with the ICARUS detector at the CNGS beam

Author

Antonello, M., Aprili, P., Baibussinov, B., Ceolin, M. Baldo, Benetti, P., Calligarich, E., Canci, N., Carbonara, F., Centro, S., Cesana, A., Cieslik, K., Cline, D. B., Cocco, A. G., Dabrowska, A., Dequal, D., Dermenev, A., Dolfini, R., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Gibin, D., Berzolari, A. Gigli, Gninenko, S., Guglielmi, A., Haranczyk, M., Holeczek, J., Ivashkin, A., Kisiel, J., Kochanek, I., Lagoda, J., Mania, S., Mannocchi, G., Menegolli, A., Meng, G., Montanari, C., Otwinowski, S., Periale, L., Piazzoli, A., Picchi, P., Pietropaolo, F., Plonski, P., Rappoldi, A., Raselli, G. L., Rossella, M., Rubbia, C., Sala, P., Scantamburlo, E., Scaramelli, A., Segreto, E., Sergiampietri, F., Stefan, D., Stepaniak, J., Sulej, R., Szarska, M., Terrani, M., Varanini, F., Ventura, S., Vignoli, C., Wang, H., Yang, X., Zalewska, A., Zaremba, K., Sanchez, P. Alvarez, Serrano, J., M., Antonello, P., Aprili, B., Baiboussinov, M. B., Ceolin, P., Benetti, E., Calligarich, N., Canci, S., Centro, A., Cesana, K., Cieslik, D. B., Cline, A. G., Cocco, A., Dabrowska, D., Dequal, A., Dermenev, R., Dolfini, C., Farnese, A., Fava, A., Ferrari, Fiorillo, Giuliana, D., Gibin, A. G., Berzolari, S., Gninenko, A., Guglielmi, M., Haranczyk, J., Holeczek, A., Ivashkin, J., Kisiel, I., Kochanek, J., Lagoda, S., Mania, G., Mannocchi, A., Menegolli, G., Meng, C., Montanari, S., Otwinowski, L., Periale, A., Piazzoli, P., Picchi, F., Pietropaolo, P., Plonski, A., Rappoldi, G. L., Raselli, M., Rossella, C., Rubbia, P., Sala, E., Scantamburlo, A., Scaramelli, E., Segreto, F., Sergiampietri, D., Stefan, J., Stepaniak, R., Sulej, M., Szarska, M., Terrani, F., Varanini, S., Ventura, C., Vignoli, H. G., Wang, A., Zalewska, K., Zaremba, P. A., Sanchez, and J., Serrano

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, argon time, neutrino beam, neutrino velocity, neutrino time of flight, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), argon, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, Liquefied gases
Abstract

The CERN-SPS accelerator has been briefly operated in a new, lower intensity neutrino mode with ~10^12 p.o.t. /pulse and with a beam structure made of four LHC-like extractions, each with a narrow width of 3 ns, separated by 524 ns. This very tightly bunched beam structure represents a substantial progress with respect to the ordinary operation of the CNGS beam, since it allows a very accurate time-of-flight measurement of neutrinos from CERN to LNGS on an event-to-event basis. The ICARUS T600 detector has collected 7 beam-associated events, consistent with the CNGS delivered neutrino flux of 2.2 10^16 p.o.t. and in agreement with the well known characteristics of neutrino events in the LAr-TPC. The time of flight difference between the speed of light and the arriving neutrino LAr-TPC events has been analysed. The result is compatible with the simultaneous arrival of all events with equal speed, the one of light. This is in a striking difference with the reported result of OPERA that claimed that high energy neutrinos from CERN should arrive at LNGS about 60 ns earlier than expected from luminal speed., Comment: 13 pages, 1 table, 3 figures

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170. Energy reconstruction of electromagnetic showers from pi0 decays with the ICARUS T600 Liquid Argon TPC

Author

Ankowski, A., Antonello, M., Aprili, P. G., Arneodo, F., Badertscher, A., Baibussinov, B., Baldo-Ceolin, M., Battistoni, G., Benetti, P., Brunetti, R., Bueno, A., Calligarich, E., Cambiaghi, M., Canci, N., Carbonara, F., Carmona, M. C., Cavanna, F., Cennini, P., Centro, S., Cesana, A., Cieslik, K., Cline, D., Cocco, A. G., Dabrowska, A., Dolfini, R., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Galli, S., Gallo, V., Garcia-Gamez, D., Gibin, D., Gigli Berzolari, A., Graczyk, K., Guglielmi, A., Holeczek, J., Kielczewska, D., Kisiel, J., Kozlowski, T., Lagoda, J., Lantz, M., Lozano, J., Mannocchi, G., Markiewicz, M., Martinez La Ossa, A., Mauri, F., Melgarejo, A. J., Menegolli, A., Meng, G., Mijakowski, P., Montanari, C., Mortari, G. Piano, Muraro, S., Navas, Sergio, Otwinowski, S., Palamara, O., Palczewski, T. J., Periale, L., Piazzoli, A., Picchi, P., Pietropaolo, F., Polchlopek, W., Posiadala, M., Prata, M., Przewlocki, P., Rappoldi, A., Raselli, G. L., Rondio, E., Rossella, M., Rubbia, A., Rubbia, C., Sala, P., Scannicchio, N., Scaramelli, A., Segreto, E., Sergiampietri, F., Sobczyk, J., Stefan, D., Stepaniak, J., Sulej, R., Szarska, M., Szeglowski, T., Szeptycka, M., Terrani, M., Varanini, F., Sandro Ventura, Vignoli, C., Wachala, T., Wang, H., Zalewska, A., A., Ankowski, M., Antonello, P. G., Aprili, F., Arneodo, A., Badertscher, B., Baibussinov, M., Baldo Ceolin, G., Battistoni, P., Benetti, R., Brunetti, A., Bueno, E., Calligarich, M., Cambiagh, N., Canci, Carbonara, Francesco, M. C., Carmona, F., Cavanna, P., Cennini, S., Centro, A., Cesana, K., Cieslik, D., Cline, A. G., Cocco, A., Dabrowska, R., Dolfini, C., Farnese, A., Fava, A., Ferrari, Fiorillo, Giuliana, S., Galli, V., Gallo, D., Garcia Gamez, D., Gibin, A. G., Berzolari, K., Graczyk, A., Guglielmi, J., Holeczek, D., Kielczewska, J., Kisiel, T., Kozlowski, J., Lagoda, M., Lantz, J., Lozano, G., Mannocchi, M., Markiewicz, A. M., De, F., Mauri, A. J., Melgarejo, A., Menegolli, G., Meng, P., Mijakowski, C., Montanari, S., Muraro, S., Nava, S., Otwinowski, O., Palamara, T. J., Palczewski, L., Periale, G. P., Mortari, A., Piazzoli, P., Picchi, F., Pietropaolo, W., Polchlopek, M., Posiadala, M., Prata, P., Przewlocki, A., Rappoldi, G. L., Raselli, E., Rondio, M., Rossella, A., Rubbia, C., Rubbia, P., Sala, D., Scannicchio, A., Scaramelli, E., Secreto, F., Sergiampietri, J., Sobczyk, D., Stefan, J., Stepaniak, R., Sulej, M., Szarska, T., Szeglowski, M., Szeptycka, M., Terrani, F., Varanini, S., Ventura, C., Vignoli, T., Wachala, H., Wang, A., Zalewska, Ankowski, A., Antonello, M., Aprili, P. G., Arneodo, F., Badertscher, A., Baibussinov, B., Baldo-Ceolin, M., Battistoni, G., Benetti, P., Brunetti, R., Bueno, A., Calligarich, E., Cambiagh, M., Canci, N., Carbonara, F., Carmona, M. C., Cavanna, F., Cennini, P., Centro, S., Cesana, A., Cieslik, K., Cline, D., Cocco, A. G., Dabrowska, A., Dolfini, R., Farnese, C., Fava, A., Ferrari, A., Fiorillo, G., Galli, S., Gallo, V., Garcia-Gamez, D., Gibin, D., Berzolari, A. Gigli, Graczyk, K., Guglielmi, A., Holeczek, J., Kielczewska, D., Kisiel, J., Kozlowski, T., Lagoda, J., Lantz, M., Lozano, J., Mannocchi, G., Markiewicz, M., Martinez de la Ossa, A., Mauri, F., Melgarejo, A. J., Menegolli, A., Meng, G., Mijakowski, P., Montanari, C., Muraro, S., Navas, S., Otwinowski, S., Palamara, O., Palczewski, T. J., Periale, L., Piano Mortari, G., Piazzoli, A., Picchi, P., Pietropaolo, F., Polchlopek, W., Posiadala, M., Prata, M., Przewlocki, P., Rappoldi, A., Raselli, G. L., Rondio, E., Rossella, M., Rubbia, A., Rubbia, C., Sala, P., Scannicchio, D., Scaramelli, A., Secreto, E., Sergiampietri, F., Sobczyk, J., Stefan, D., Stepaniak, J., Sulej, R., Szarska, M., Szeglowski, T., Szeptycka, M., Terrani, M., Varanini, F., Ventura, S., Vignoli, C., Wachala, T., Wang, H., and Zalewska, A.

Subjects
energia elektromagnetyczna, Physics - Instrumentation and Detectors, rozpady mezonów, Astrophysics::High Energy Astrophysical Phenomena, metoda Monte Carlo, kalorymetry, High Energy Physics::Experiment, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract

We discuss the ICARUS T600 detector capabilities in electromagnetic shower reconstruction through the analysis of a sample of 212 events, coming from the 2001 Pavia surface test run, of hadronic interactions leading to the production of $\pi^{0}$ mesons. Methods of shower energy and shower direction measurements were developed and the invariant mass of the photon pairs was reconstructed. The ($\gamma$,$\gamma$) invariant mass was found to be consistent with the value of the $\pi^0$ mass. The resolution of the reconstructed $\pi^0$ mass was found to be equal to 27.3%. An improved analysis, carried out in order to clean the full event sample from the events measured in the crowded environment, mostly due to the trigger conditions, gave a $\pi^0$ mass resolution of 16.1%, significantly better than the one evaluated for the full event sample. The trigger requirement of the coincidence of at least four photomultiplier signals favored the selection of events with a strong pile up of cosmic ray tracks and interactions. Hence a number of candidate $\pi^0$ events were heavily contaminated by other tracks and had to be rejected. Monte Carlo simulations of events with $\pi^0$ production in hadronic and neutrino interactions confirmed the validity of the shower energy and shower direction reconstruction methods applied to the real data., Comment: 24 pages, 16 figures

171. Neutron cross-sections for next generation reactors: new data from n_TOF.

Author

Colonna N, Abbondanno U, Aerts G, Alvarez H, Alvarez-Velarde F, Andriamonje S, Andrzejewski J, Assimakopoulos P, Audouin L, Badurek G, Baumann P, Becvar F, Berthoumieux E, Calviani M, Calviño F, Cano-Ott D, Capote R, de Albornoz AC, Cennini P, Chepel V, Chiaveri E, Cortes G, Couture A, Cox J, Dahlfors M, David S, Dillman I, Dolfini R, Domingo-Pardo C, Dridi W, Duran I, Eleftheriadis C, Ferrant L, Ferrari A, Ferreira-Marques R, Frais-Koelbl H, Fujii K, Furman W, Goncalves I, González-Romero E, Goverdovski A, Gramegna F, Griesmayer E, Guerrero C, Gunsing F, Haas B, Haight R, Heil M, Herrera-Martinez A, Igashira M, Isaev S, Jericha E, Käppeler F, Kadi Y, Karadimos D, Karamanis D, Kerveno M, Ketlerov V, Koehler P, Konovalov V, Kossionides E, Krticka M, Lampoudis C, Leeb H, Lindote A, Lopes I, Lozano M, Lukic S, Marganiec J, Marques L, Marrone S, Martínez T, Massimi C, Mastinu P, Mengoni A, Milazzo PM, Moreau C, Mosconi M, Neves F, Oberhummer H, O'Brien S, Oshima M, Pancin J, Papachristodoulou C, Papadopoulos C, Paradela C, Patronis N, Pavlik A, Pavlopoulos P, Perrot L, Pigni MT, Plag R, Plompen A, Plukis A, Poch A, Pretel C, Quesada J, Rauscher T, Reifarth R, Rosetti M, Rubbia C, Rudolf G, Rullhusen P, Salgado J, Sarchiapone L, Savvidis I, Stephan C, Tagliente G, Tain JL, Tassan-Got L, Tavora L, Terlizzi R, Vannini G, Vaz P, Ventura A, Villamarin D, Vicente MC, Vlachoudis V, Vlastou R, Voss F, Walter S, Wendler H, Wiescher M, and Wisshak K

Subjects
Equipment Design, Equipment Failure Analysis, Neutrons, Reproducibility of Results, Sensitivity and Specificity, Neutron Capture Therapy instrumentation, Neutron Capture Therapy methods, Nuclear Reactors
Abstract

In 2002, an innovative neutron time-of-flight facility started operation at CERN: n_TOF. The main characteristics that make the new facility unique are the high instantaneous neutron flux, high resolution and wide energy range. Combined with state-of-the-art detectors and data acquisition system, these features have allowed to collect high accuracy neutron cross-section data on a variety of isotopes, many of which radioactive, of interest for Nuclear Astrophysics and for applications to advanced reactor technologies. A review of the most important results on capture and fission reactions obtained so far at n_TOF is presented, together with plans for new measurements related to nuclear industry., (Copyright 2010 Elsevier Ltd. All rights reserved.)

Published
2010
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172. Neutral-strange-particle production in 200-GeV/c p/ pi +/K+ interactions on Au, Ag, and Mg.

Author

Brick DH, Widgoff M, Beilliere P, Lutz P, Narjoux JL, Gelfand N, Alyea ED Jr, Bloomer M, Bober J, Busza W, Cole B, Frank TA, Fuess TA, Grodzins L, Hafen ES, Haridas P, Huang D, Huang HZ, Hulsizer R, Kistiakowsky V V, Ledoux RJ, Milstene C, Noguchi S, Oh SH, Pless IA, Steadman S, Stoughton TB, Suchorebrow V V, Tether S, Trepagnier PC, Wadsworth BF, Wu Y, Yamamoto RK, Cohn HO, Calligarich E, Corti G, Dolfini R, Gianini G, Introzzi G, Ratti S, Badiak M, DiMarco R, Jacques PF, Kalelkar M, Plano RJ, Stamer PE, Brucker EB, Koller EL, Alexander G, Grunhaus J, Levy A, Brau JE, Bugg WM, Condo GT, Handler T, Hargis HJ, Hart EL, Rafatian A, Rogers AH, Kitagaki T, Tanaka S, Yuta H, Abe K, and Hasegawa K

Published
1992
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173. Multiparticle production by 200-GeV/c hadrons on gold, silver, and magnesium targets.

Author

Brick DH, Widgoff M, Beilliere P, Lutz P, Narjoux JL, Gelfand N, Alyea ED Jr, Bloomer M, Bober J, Busza W, Cole B, Frank TA, Fuess TA, Grodzins L, Hafen ES, Haridas P, Huang D, Huang HZ, Hulsizer R, Kistiakowsky V V, Ledoux RJ, Milstene C, Noguchi S, Oh SH, Pless IA, Steadman S, Stoughton TB, Suchorebrow V V, Tether S, Trepagnier PC, Wadsworth BF, Wu Y, Yamamoto RK, Cohn HO, Calligarich E, Castoldi C, Dolfini R, Introzzi L, Ratti S, Badiak M, DiMarco R, Jacques PF, Kalelkar M, Plano RJ, Stamer PE, Brucker EB, Koller EL, Alexander G, Grunhaus J, Levy A, Brau JE, Bugg WM, Condo GT, Handler T, Hargis HJ, Hart EL, Rafatian A, Rogers AH, Kitagaki T, Tanaka S, Yuta H, Abe K, Hasegawa K, and Yamaguchi A

Published
1989
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