Search

Your search keyword '"G. C., Bonazzola"' showing total 35 results
Start Over Author "G. C., Bonazzola"
35 results on '"G. C., Bonazzola"'

1. Observation of radiation induced latchup in the readout electronics of NA50 multiplicity detector

Author

Mario Sitta, Paolo Giubellino, J. De Witt, Luciano Ramello, Bruno Alessandro, A. Marzari Chiesa, P. Rato Mendes, Stefania Beole, G. C. Bonazzola, Marek Idzik, F. Prino, L. Riccati, Massimo Masera, and E. Crescio

Subjects
Physics, Nuclear and High Energy Physics, business.industry, Detector, Front end electronics, particle detectors, Radiation, Ionizing radiation, Ion, Optics, CMOS, Neutron flux, Nuclear electronics, Neutron, business, Instrumentation
Abstract

During the data taking of the NA50 experiment, the CMOS digital pipeline chips (CDP) used for the readout of the multiplicity detector were exposed to high levels of radiation resulting in an ionizing radiation dose of more than 200 krad and displacement damage equivalent to 1 MeV neutron fluence of more than 5 � 10 11 eq. neutrons cm � 2 : Some of these chips showed anomalies of behaviour which we attribute to radiation induced latchup phenomena. Here we present the analysis of the data taken during the 1996, 1998 and 1999 ion runs together with the results of measurements performed in the laboratory. r 2002 Elsevier Science B.V. All rights reserved. PACS: 85.40.Qx; 61.80

Published
2002

2. A large-area neutron detector based on double scattering

Author

Tullio Bressani, G. C. Bonazzola, A. Feliciello, Felice Iazzi, P. Gianotti, S. Marcello, Michelangelo Agnello, and D. Calvo

Subjects
Physics, Bonner sphere, Nuclear and High Energy Physics, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Neutron stimulated emission computed tomography, Neutron scattering, Neutron time-of-flight scattering, Optics, Neutron source, Neutron detection, Large Area Neutron Detector, Neutron, business, Instrumentation
Abstract

The performance of a detector designed for measuring the energy of neutrons emitted during a cold-fusion experiment is described. It is based on the operating principle of neutron double scattering in two different scintillator arrays; the results obtained from a calibration with a 241 AmBe neutron source in terms of efficiency, energy spectrum reconstruction and background rejection capabilities are reported.

Published
1990

3. Changes in the Annihilation’s delay time distribution of stopped antiprotons in helium gas, due to contaminants.—I

Author

V. G. Ableev, A. Adamo, M. Agnello, F. Balestra, G. Belli, G. Bendiscioli, A. Bertin, P. Boccaccio, G. C. Bonazzola, T. Bressani, M. Bruschi, M. P. Bussa, L. Busso, D. Calvo, M. Capponi, B. Cereda, P. Cerello, C. Cicalo, M. Corradini, S. Costa, S. Castro, O. Y.u. Denisov, F. D’Isep, A. Donzella, L. Fava, A. Feliciello, L. Ferrero, A. Filippi, V. Filippini, D. Galli, R. Garfagnini, U. Gastaldi, B. Giacobbe, P. Gianotti, A. Grasso, C. Guaraldo, F. Iazzi, A. Lai, A. Lanaro, E. Lodi Rizzini, M. Lombardi, V. Lucherini, A. Maggiora, S. Marcello, U. Marconi, G. Maron, A. Masoni, I. Massa, B. Minetti, P. Montagna, M. Morando, L. Musa, F. Nichitiu, D. Panzieri, G. Pauli, M. Piccinini, G. Piragino, M. Poli, S. N. Prakhov, G. Puddu, R. A. Ricci, C. Rizzo, E. Rossetto, A. Rotondi, A. M. Rozhdestvensky, P. Salvini, L. Santi, M. G. Sapozhnikov, N. Semprini Cesari, S. Serci, R. Spighi, P. Temnikov, F. Tosello, V. I. Tretyak, G. L. Usai, L. Vannucci, S. Vecchi, G. Vedovato, L. Venturelli, M. Villa, A. Vitale, E. Zavattini, A. Zenoni, A. Zoccoli, G. Zosi, MARGAGLIOTTI, GIACOMO, TESSARO, SUSANNA, V. G., Ableev, A., Adamo, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, B., Cereda, P., Cerello, C., Cicalo, M., Corradini, S., Costa, S., Castro, Denisov, O. Y. u., F., D’Isep, A., Donzella, L., Fava, A., Feliciello, L., Ferrero, A., Filippi, V., Filippini, D., Galli, R., Garfagnini, U., Gastaldi, B., Giacobbe, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lai, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, P., Montagna, M., Morando, L., Musa, F., Nichitiu, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, S. N., Prakhov, G., Puddu, R. A., Ricci, C., Rizzo, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, R., Spighi, P., Temnikov, Tessaro, Susanna, F., Tosello, V. I., Tretyak, G. L., Usai, L., Vannucci, S., Vecchi, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, E., Zavattini, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Physics, Quenching, Annihilation, Antiproton-induced reactions, Hydrogen, chemistry.chemical_element, Nanosecond, Neon, Xenon, chemistry, Antiproton, Atomic physics, Bar (unit)
Abstract

The effect of contaminants (H2, N2, Ne, Ar, Xe) on the time distribution of delayed annihilations (average delay time about 3 μs) of antiprotons stopped in helium gas, at 3 atm and room temperature, has been experimentally investigated. The annihilation rate is expressed in terms of an empirical «quenching cross-section»,\(\bar \sigma \), that is different for the different contaminants. For hydrogen and xenon at low concentrations,\(\bar \sigma \) is around 3.5·10−16 cm2, and is more than ten times larger than for the other contaminants. It has been observed that the addition of a contaminant, with the exception of neon, gives also rise to a delayed annihilation’s component that decays with an average time of some hundreds of nanoseconds. It seems that this fast component increases and its average time decreases as the contaminant concentration increases.

Published
1994

4. Measurement of the (anti)p-pi+pi and (anti)p-K+K- annihilation frequencies in a 5 mb hydrogen gas target

Author

V. G. Ableev, A. Adamo, M. Agnello, A. Andrighetto, F. Balestra, G. Belli, G. Bendiscioli, A. Bertin, P. Boccaccio, G. C. Bonazzola, T. Bressani, M. Bruschi, M. P. Bussa, L. Busso, D. Calvo, M. Capponi, P. Cerello, C. Cicalo, M. Corradini, S. Costa, I. D'Antone, S. De Castro, F. D'Isep, A. Donzella, L. Fava, A. Feliciello, L. Ferrero, A. Filippi, V. Filippini, D. Galli, R. Garfagnini, U. Gastaldi, P. Gianotti, A. Grasso, C. Guaraldo, F. Iazzi, A. Lai, A. Lanaro, E. Lodi Rizzini, M. Lombardi, V. Lucherini, A. Maggiora, G. Maneva, S. Marcello, U. Marconi, G. Maron, A. Masoni, I. Massa, B. Minetti, M. Morando, P. Montagna, L. Musa, F. Nichitiu, D. Panzieri, G. Pauli, M. Piccinini, G. Piragino, M. Poli, G. Puddu, R. A. Ricci, E. Rossetto, A. Rotondi, A. M. Rozhdestvensky, P. Salvini, L. Santi, M. G. Sapozhnikov, N. Semprini Cesari, S. Serci, R. Spighi, S. Vecchi, P. Temnikov, S. Tessaro, F. Tosello, V. I. Tretyak, G. Usai, L. Vannucci, G. Vedovato, L. Venturelli, M. Villa, A. Vitale, A. Zenoni, A. Zoccoli, G. Zosi, MARGAGLIOTTI, GIACOMO, V. G., Ableev, A., Adamo, M., Agnello, A., Andrighetto, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, P., Cerello, C., Cicalo, M., Corradini, S., Costa, I., D'Antone, S., De Castro, F., D'Isep, A., Donzella, L., Fava, A., Feliciello, L., Ferrero, A., Filippi, V., Filippini, D., Galli, R., Garfagnini, U., Gastaldi, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lai, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, G., Maneva, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, M., Morando, P., Montagna, L., Musa, F., Nichitiu, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, R., Spighi, S., Vecchi, P., Temnikov, S., Tessaro, F., Tosello, V. I., Tretyak, G., Usai, L., Vannucci, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
BRANCHING RATIOS, K+K
Abstract

We report the first measurement of the K+K-, pi+pi- frequencies for pBAR annihilations at rest in a gaseous H-2 target at low pressure (5 mbar). We have obtained:f(pipi)=(4.26+/-0.11) X 10(-3), f(KK)=(0.46+/-0.03)X10(-3). The ratio R=f(KK)/f(pipi) has also been measured at a pressure of 2 mbar. Comparison with previous measurements shows that f(KK) decreases monotonically with the target density but its value at 5 mbar is still higher than the value with L X-rays in coincidence.

Published
1994

5. The φπ+/ωπ+ ratio from anti-np annihilations

Author

A. Adamo, M. Agnello, F. Balestra, G. Bendiscioli, A. Bertin, P. Boccaccio, G. C. Bonazzola, T. Bressani, M. Bruschi, M. P. Bussa, L. Busso, D. Calvo, M. Capponi, B. Cereda, P. Cerello, C. Cicalò, S. Costa, S. Castro, F. D’Isep, L. Fava, A. Feliciello, L. Ferrero, A. Filippi, V. Filippini, D. Galli, R. Garfagnini, U. Gastaldi, B. Giacobbe, P. Gianotti, A. Grasso, C. Guaraldo, F. Iazzi, A. Lanaro, E. Lodi Rizzini, M. Lombardi, V. Lucherini, A. Maggiora, S. Marcello, U. Marconi, MARGAGLIOTTI, GIACOMO, G. Maron, A. Masoni, I. Massa, B. Minetti, P. Montagna, M. Morando, F. Nichitiu, D. Panzieri, G. Pauli, M. Piccinini, G. Piragino, M. Poli, G. Puddu, R. A. Ricci, E. Rossetto, A. Rotondi, A. M. Rozhdestvensky, P. Salvini, L. Santi, M. G. Sapozhnikov, N. Semprini Cesari, S. Serci, P. Temnikov, TESSARO, SUSANNA, F. Tosello, V. I. Tretyak, G. Usai, L. Vannucci, S. Vecchi, G. Vedovato, L. Venturelli, M. Villa, A. Vitale, A. Zenoni, A. Zoccoli, G. Zosi, L.Montanet and G.Preparata, A., Adamo, M., Agnello, F., Balestra, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, B., Cereda, P., Cerello, C., Cicalò, S., Costa, S., Castro, F., D’Isep, L., Fava, A., Feliciello, L., Ferrero, A., Filippi, V., Filippini, D., Galli, R., Garfagnini, U., Gastaldi, B., Giacobbe, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, P., Montagna, M., Morando, F., Nichitiu, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, P., Temnikov, Tessaro, Susanna, F., Tosello, V. I., Tretyak, G., Usai, L., Vannucci, S., Vecchi, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Mesons and meson resonance, Mesons and meson resonances, Hadron-induced low- and intermediate-energy reactions and scattering (energy≤10 GeV)
Abstract

A preliminary study of n¯p three-prong annihilations into the channels K− K+ π+ and π− π+ π+ π0 is presented for ∼ 100–297 MeV/c n¯ momenta. The extracted φπ+/ωπ+ production ratio shows that also in this channel, never measured before using an n¯p beam, the OZI rule is strongly violated.

Published
1994

6. Anti-p stopping power in hydrogen below 1 MeV and the anti-p 4He metastable state

Author

A. Adamo, M. Agnello, F. Balestra, G. Belli, G. Bendiscioli, A. Bertin, P. Boccaccio, G. C. Bonazzola, T. Bressani, M. Bruschi, M. P. Bussa, L. Busso, D. Calvo, M. Capponi, C. Cicaló, M. Corradini, S. Costa, S. De Castro, F. D'Isep, A. Donzella, L. Fava, A. Feliciello, L. Ferrero, V. Filippini, D. Galli, R. Garfagnini, U. Gastaldi, P. Gianotti, A. Grasso, C. Guaraldo, F. Iazzi, A. Lanaro, E. Lodi Rizzini, M. Lombardi, V. Lucherini, A. Maggiora, S. Marcello, U. Marconi, G. Maron, A. Masoni, I. Massa, B. Minetti, M. Morando, P. Montagna, F. Nichitiu, M. Panzieri, G. Pauli, M. Piccinini, G. Piragino, M. Poli, G. Puddu, R. A. Ricci, C. Rizzo, E. Rossetto, A. Rotondi, A. M. Rozhdestvensky, P. Salvini, L. Santi, M. G. Sapozhmkov, N. Semprini Cesari, S. Serci, P. Temnikov, F. Tosello, V. I. Tretyak, G. L. Usai, L. Vannucci, S. Vecchi, G. Vedovato, L. Venturelli, M. Villa, A. Vitale, E. Zavattini, A. Zenom, A. Zoccoli, G. Zosi, MARGAGLIOTTI, GIACOMO, TESSARO, SUSANNA, A., Adamo, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, C., Cicaló, M., Corradini, S., Costa, S., De Castro, F., D'Isep, A., Donzella, L., Fava, A., Feliciello, L., Ferrero, V., Filippini, D., Galli, R., Garfagnini, U., Gastaldi, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, M., Morando, P., Montagna, F., Nichitiu, M., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, G., Puddu, R. A., Ricci, C., Rizzo, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhmkov, N., Semprini Cesari, S., Serci, P., Temnikov, Tessaro, Susanna, F., Tosello, V. I., Tretyak, G. L., Usai, L., Vannucci, S., Vecchi, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, E., Zavattini, A., Zenom, A., Zoccoli, and G., Zosi

Subjects
Helium, rates, Stopping power, rate
Abstract

The stopping power of H-2 for psBAR was measured in the pBAR energy interval 1 keV divided-by 120 keV using a low density gas target (rho/rho(o) = 10(-3) divided-by 10(-2), rho(o) being the H2 density at STP) with the OBELIX spectrometer at the LEAR of CERN. Furthermore, the formation of metastable states in the pBAR He-4 interaction at rest, having a mean life of the order of 3 mus, was investigated at six target gas pressures (3 atm and 400, 250, 200, 150, 50 mbar). The influence of contaminants (like H-2, Ne, Ar, N2 and Xe) on the life of such metastable states was examined at the target gas pressure of 3 atm.

Published
1993

7. Distribution of Fallout Radionuclides in Soil, Plants, and Honey

Author

A Patetta, A Manino, R Ropolo, and G C Bonazzola

Subjects
Radioactive Fallout, Radionuclide, Epidemiology, Health, Toxicology and Mutagenesis, Radioactive fallout, Potassium Radioisotopes, Honey, Plants, Italy, Cesium Radioisotopes, Nuclear Reactors, Accidents, Environmental chemistry, Soil water, Radioactive contamination, Soil Pollutants, Radioactive, Environmental science, Radiology, Nuclear Medicine and imaging, Soil Pollutants, Ukraine
Published
1991

8. ϕ and ω Meson Production in n ̅p Annihilation and the OZI Rule

Author

V . G. Ableev, M. Agnello, F. Balestra, G. Bendiscioli, A. Bertin, G. C. Bonazzola, E. Botta, T. Bressani, M. Bruschi, M. P. Bussa, L. Busso, D. Calvo, M. Capponi, B. Cereda, P. Cerello, C. Cicalò, M. Corradini, S. Costa, S. DeCastro, F. D' Isep, A. Donzella, L. Fava, A. Feliciello, L. Ferrero, A. Filippi, V. Filippini, A. Fontana, T. D. Galli, R. Garfagnini, U. Gastaldi, B. Giacobbe, P. Giannotti, A. Grasso, C. Guaraldo, F. Iazzi, A. Lanaro, E. Lodi Rizzini, V. Lucherini, A. Maggiora, S. Marcello, U. Marconi, G. V. Margagliotti, A. Masoni, B. Minetti, P. Montagna, M. Morando, F. Nichitiu, M. Nupieri, D. Panzieri, G. Pauli, M. Piccinini, G. Puddu, E. Rossetto, A. Rotondi, A. M. Rozhdestvensky, A. Saino, P. Salvini, L. Santi, M. G. Sapozhnikov, N. Semprini Cesari, S. Serci, R. Spighi, P. Temnikov, S. Tessaro, F. Tosello, V. I. Tretyak, G. Usai, S. Vecchi, L. Venturelli, M. Villa, A. Vitale, A. Zenoni, A. Zoccoli, and G. Zosi

Abstract

The ϕπ^+/ωπ^+ ratio from n ̅p annihilations on a liquid hydrogen target, for n ̅ momenta between 64 and 297 MeV/c, was measured using the OBELIX spectrometer at LEAR. The ratio R(ϕπ/ωπ) = σ(n ̅p -> ϕπ^+)/σ(n ̅p->ωπ^+) turned out 0.110±0.015_stat ± 0.006_syst. Implications of this result on the OZI rule are discussed.

Published
1994
Full Text
View/download PDF

9. FINUDA - A Detector for Nuclear Physics at DAFNE (out of print esaurita)

Author

M. Agnello, G. Belli, G. Bendiscioli, G. C. Bonazzola, E. Botta, T. Bressani, D. Calvo, P. Camerini, C. Cattaneo, N. Colonna, M. Corradini, S. Costa, G. D' Erasmo, F. D' Isep, A. Donzella, A. Feliciello, A. Filippi, V. Filippini, E. M. Fiore, L. Fiore, P. Gianotti, D. R. Gill, N. Grion, G. Guaraldo, A. E. Kuzimin, F. Iazzi, A. Lanaro, L. Lee, E. Lodi Rizzini, V. Lucherini, S. Marcello, G. M. Marshall, B. Minetti, P. Montagna, A. A. Nozdrin, A. Olin, A. Pantaleo, V. Piticchio, I. L. Pisarev, E. Rossetto, A. Rotondi, R. Rui, P. Salvini, B. Z. Serduyk, A. Sharma, G. Smith, S. Tessaro, L. Venturelli, S. Yen, and A. Zenoni

Abstract

We propose the construction of a detector dedicated to Nuclear Physics studies, called FINUDA, at DAFNE, the Frascati ∅-Factory. The initial physics program is focused on the spectroscopy and decay modes of Λ-hypernuclei, which are produced following of tagged K^{-} in nuclear targets. The unique property of kaons at DAFNE, coupled to the expected performances of FINUDA (momentum resolution of 0.2% FWHM, and dedicated triggers) will allow an unprecedented step forward concerning the precision of the measurements and, even more, the counting rates. At l = 10^32 cm^-2 s^-1 we expect to produce and carefully study about 20 hypernuclei, most of them new. The puzzling situation regarding the validity of the ΛI=1/2 rule for non-mesonic decays of hypernuclei will be hopefully clarified. FINUDA could also be used for measurements on low K=N interaction.

Published
1993
Full Text
View/download PDF

10. The First level trigger of the OBELIX spectrometer

Author

G. C. Bonazzola, P. De Remigis, A. Feliciello, D. Calvo, Tullio Bressani, S. Marcello, S. Gallian, A. Adamo, S. Serci, P. Gianotti, and I. Massa

Subjects
Physics, Nuclear and High Energy Physics, multiplicity trigger, Spectrometer, business.industry, fast logic, Detector, pattern recognition, time-of-flight, Particle detector, Time of flight, Trigger, Pulse circuits, Level trigger, business, Instrumentation, Computer hardware
Abstract

The first level trigger of the OBELIX (PS 201) experiment is described. Based on the time of flight system (TOF) of the detector and including modules designed for the purpose, we have built and operated a system capable of selecting simple prespecified hit patterns within 200 ns.

Published
1991

11. Charge Coupled Devices as Autoradiography Imagers

Author

R. Ropolo and G. C. Bonazzola

Subjects
Physics, Nuclear and High Energy Physics, Pixel, business.industry, Charge (physics), Semiconductor device, Particle detector, Optics, Nuclear Energy and Engineering, Depletion region, Electronic engineering, Charge-coupled device, Electrical and Electronic Engineering, business, Image resolution, Voltage
Abstract

The charge collected in the depletion region of a charge coupled device (CCD) owing to the passage of low energy beta-particles is exploited in order to obtain localized information of the hits distribution from exposure to radioactively labelled test patterns. An image field of 8.64×5.82 mm2 is stored as a matrix of 290×218 pixels each represented by an 8 bit word. Factors governing system performance are analyzed and compared with conventional autoradiography.

Published
1985

12. Computer Simulation of Semiconductor Dosimeters

Author

A. Zanini, U. Nastasi, G. C. Bonazzola, and C. Manfredotti

Subjects
Physics, Nuclear and High Energy Physics, medicine.medical_specialty, Dosimeter, Physics::Instrumentation and Detectors, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Detector, Gamma ray, Imaging phantom, Spectral line, Semiconductor detector, Optics, Semiconductor, Nuclear Energy and Engineering, medicine, Medical physics, Electrical and Electronic Engineering, business
Abstract

A previous Monte Carlo program, ISIDE, for the simulation of semiconductor gamma ray detectors, has been extended to a new code, PHANTOM, which can be used either for calculating the gamma ray exposure from the output of semiconductor detectors working in pulse mode or for determining the isodose curves in a cylindrical phantom exposed to a disk gamma ray source. The results are used to evaluate the exposure from the spectra recorded by a HgI2 detector in the energy range 10 KeV - 1 MeV. A good agreement with experimental results either for phantoms and for semiconductor detectors is obtained.

Published
1985

14. Mössbauer spectrometry with multiwire proportional counters

Author

E. Chiavassa, C. Barbero, Tullio Bressani, G. C. Bonazzola, and A. Musso

Subjects
Physics, Nuclear reaction, Nuclear magnetic resonance, Spectrometer, Physics::Instrumentation and Detectors, Detector, Solid angle, General Physics and Astronomy, Figure of merit, Proportional counter, Coulomb excitation, Computational physics, Mossbauer spectrometry
Abstract

MSssbauer spectrometry, as it is currently performed, is inherently a single-channel technique; the (~ channel ~ is defined by the ~,-ray collimation, always present in conventional spectrometers. In the constant-velocity spectrometers the transmission spectrum is obtained by varying step-by-step the value of the relative velocity between the source and the absorber. These spectrometers allow a good absolute calibration for the values of the velocities, but are affected by the instabilities of the detector electronics. In an ~V-channel constant-acceleration spectrometer at best each channel is open only 1/~V seconds per second. These latter spectrometers are less sensitive to instabilities of the associated electronics but they remain essentially single channel devices since also in this case only the y-rays emitted in a small solid angle are counted. Indeed, the most important consideration is that these two types of spectrometers have about the same Figure of merit as to running time necessary to obtain good statistics. I t is thus evident the usefulness of having a MSssbauer spectrometer which would be the analogue of the multichannel analyser for pulse height analysis. The possibility of reducing the running times by a factor of hundreds is particularly interesting when the nuclear levels, which undergo the u transitions involved in the M6ssbauer effect, are populated through a nuclear reaction induced by some incident particles beam (Coulomb excitation (d, p) reactions) and not by a radiaetive decay. On the other hand, a source moving with constant velocity v 0 has velocities between v o and 0 relative to observers distributed at angles between 0 and ~/2 around v o. This suggests the possibility of measuring simultaneously the complete velocity spectrum with a large-angle localizing detector. We think that the multiwire proportional counter (1) (MWPC) is the ideal detector to be used in the construction of a true multiehannel M6ssbauer spectrometer. Let us imagine an experimental set-up as sketched in Fig. 1.

Published
1972

16. Elastic and inelastic backscattering of 14.2 MeV neutrons from28Si

Author

E. Chiavassa, Bruno Minetti, Tullio Bressani, G. C. Bonazzola, and A. Pasquarelli

Subjects
Nuclear physics, Physics, Angular distribution, Nuclear Theory, Neutron cross section, General Physics and Astronomy, Neutron, Neutron scattering, Inelastic scattering, Nuclear Experiment, Inelastic neutron scattering, Neutron time-of-flight scattering
Abstract

The differential cross sections and angular distributions for the elastic and inelastic backscattering of 14.2-MeV neutrons from silicon-28 are found. (JFP)

Published
1973

17. Backward scattering of 14.1 MeV neutrons from12C

Author

L. Naldi, Tullio Bressani, E. Chiavassa, G. Venturello, and G. C. Bonazzola

Subjects
Physics, Elastic scattering, Nuclear physics, Angular distribution, Scattering, Carbon-12, General Physics and Astronomy, Neutron spectra, Neutron, Atomic physics, Inelastic scattering, Neutron temperature
Published
1972

19. Possible application of the optical tunnel effect to membrane biophysics

Author

E. Conte, G. Ciocchetti, M. Maringelli, A. Trabucco, G. C. Bonazzola, and A. De Marco

Subjects
Total internal reflection, Membranes, business.industry, Chemistry, Lipid Bilayers, Biophysics, Biological membrane, General Medicine, Models, Biological, Tunnel effect, Membrane, Optics, Animals, sense organs, business, Membrane biophysics, Electromagnetic Phenomena, Quantum tunnelling, Mathematics
Abstract

The exploitation of the optical tunnel effect allows the detection of very small spatial variations. The theory of optical tunneling is extended to an absorbing medium and an experimental apparatus capable of detecting displacements down to 0.19 nm, with fluctuations equivalent to 0.10 nm, is described. Some possible applications to the measurement of electrically induced volume changes of biological membranes are discussed.

Published
1985

20. Inelastic scattering of 14.2 MeV neutrons from31P and32S

Author

Tullio Bressani, G. C. Bonazzola, M. Maringelli, and E. Chiavassa

Subjects
Nuclear physics, Physics, Neutron stimulated emission computed tomography, Quasielastic neutron scattering, General Physics and Astronomy, Neutron, Neutron scattering, Inelastic scattering, Atomic physics, Small-angle neutron scattering, Neutron time-of-flight scattering, Neutron temperature
Published
1969

21. φ and ω meson production in annihilation and the OZI rule

Author

M. Corradini, Alberto Masoni, D. Calvo, F. Nichitiu, L. Venturelli, A. Grasso, G. Pauli, A. Filippi, R. Garfagnini, Paolo Montagna, Elena Botta, F. Tosello, S. Tessaro, Michelangelo Agnello, Marco Bruschi, Antonio Zoccoli, S. Marcello, Umberto Marini Bettolo Marconi, T. D. Galli, Tullio Bressani, V.I. Tretyak, A. Saino, U. Gastaldi, A. Maggiora, V. Lucherini, F. D'Isep, V. Filippini, L. Fava, M. Morando, F. Balestra, Paola Gianotti, Aldo Zenoni, G. Zosi, L. Busso, M. Nupieri, Roberto Spighi, Bruno Minetti, M.P. Bussa, P. Cerello, M.G. Sapozhnikov, S. De Castro, Stefania Vecchi, A. Bertin, A.M. Rozhdestvensky, S. Costa, G. L. Usai, A. Vitale, P.P. Temnikov, Felice Iazzi, Corrado Cicalo, Massimo Piccinini, Adriano Fontana, M. Capponi, N. Semprini Cesari, B. Cereda, S. Serci, L. Santi, Mauro Villa, V.G. Ableev, Armando Lanaro, L. Ferrero, Alberto Rotondi, G. Puddu, E. Rossetto, D. Panzieri, G. V. Margagliotti, Alessandro Feliciello, C. Guaraldo, G. Bendiscioli, G.C. Bonazzola, Paola Salvini, Antonietta Donzella, Benedetto Giacobbe, E. Lodi Rizzini, V. G., Ableev, M., Agnello, F., Balestra, G., Bendiscioli, A., Bertin, G. C., Bonazzola, E., Botta, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, B., Cereda, P., Cerello, C., Cicalò, M., Corradini, S., Costa, S., De Castro, F., D'Isep, A., Donzella, L., Fava, A., Feliciello, L., Ferrero, A., Filippi, V., Filippini, A., Fontana, T. D., Galli, R., Garfagnini, U., Gastaldi, B., Giacobbe, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, A., Masoni, B., Minetti, P., Montagna, M., Morando, F., Nichitiu, M., Nupieri, D., Panzieri, G., Pauli, M., Piccinini, G., Puddu, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, A., Saino, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, R., Spighi, P., Temnikov, S., Tessaro, F., Tosello, V. I., Tretyak, G., Usai, S., Vecchi, L., Venturelli, M., Villa, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, 4-QUARK EXOTICS, Elementary particle, Antineutron, Omega, Nuclear physics, OZI rule, Mass spectrum
Abstract

The φπ + /ωπ + ratio from n ¯ p annihilations on a liquid hydrogen target, for n ¯ momenta between 64 and 297 MeV/ c , was measured using the OBELIX spectrometer at LEAR. The ratio R ( ϕ π / ω π ) = σ ( n ¯ p → ϕ π + ) / σ ( n ¯ p → ω π + ) turned out 0.110±0.015 stat ±0.006 syst . Implications of this result on the OZI rule are discussed.

Published
1994

22. First results on nuclear physics with antineutrons by the OBELIX spectrometer

Author

M. Morando, Paolo Montagna, A. Grasso, S. De Castro, Felice Iazzi, L. Ferrero, A. Bertin, I. Massa, S. Marcello, Corrado Cicalo, S. Serci, U. Marconi, L. Vannucci, M. Lombardi, F. D'Isep, G. Maron, L. Busso, M. Corradini, G. Bendiscioli, N. Semprini Cesari, D. Galli, M.G. Sapozhnikov, L. Santi, Alberto Rotondi, L. Fava, R. Garfagnini, F. Nichitiu, S. Costa, M. Capponi, C. Guaraldo, Tullio Bressani, U. Gastaldi, G. L. Usai, V. Lucherini, A. Vitale, G. V. Margagliotti, V. Filippini, G. Pauli, R. A. Ricci, A. Maggiora, D. Panzieri, S. Tessaro, V.I. Tretyak, Aldo Zenoni, Mauro Villa, I. D'Antone, D. Calvo, Michelangelo Agnello, Guido Zavattini, Bruno Minetti, Antonio Zoccoli, P. Boccaccio, P. Gianotti, E. Lodi Rizzini, G. Piragino, A. Adamo, F. Balestra, G. Puddu, P.P. Temnikov, Gianfranco Zosi, Marco Bruschi, Alberto Masoni, E. Rossetto, L. Venturelli, F. Tosello, G. Bonazzola, A.M. Rozhdestvensky, Massimo Piccinini, Armando Lanaro, M. Poli, G. Vedovato, A. Feliciello, G. Belli, M.P. Bussa, Paola Salvini, A., Adamo, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, C., Cicalò, M., Corradini, S., Costa, I., D'Antone, S., De Castro, F., D'Isep, L., Fava, A., Feliciello, L., Ferrero, V., Filippini, D., Galli, R., Garfagnini, U., Gastaldi, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, M., Morando, P., Montagna, F., Nichitiu, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, P., Temnikov, Tessaro, Susanna, F., Tosello, V. I., Tretyak, G. L., Usai, L., Vannucci, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, G., Zavattini, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Spectrometer, nbar-nucleus, Nuclear Theory, nbar-p, Antineutron, Nuclear physics, medicine.anatomical_structure, medicine, Nuclear Experiment, Spectroscopy, Nucleon, Nucleus
Abstract

First results on n annihilations on nucleons and nuclei measured by the OBELIX spectrometer are reported. Interesting new results on meson spectroscopy were obtained. Furthermore n-p and n - Nucleus (C, Al, Cu, Sn, Pb) annihilation cross sections between 100 and 300 MeV/c were measured.

Published
1993

23. Study of the OZI-rule violation in antiproton annihilation in deuterium at rest

Author

S. De Castro, Bruno Minetti, Maurizio Piccinini, A. Maggiora, M.G. Sapozhnikov, O.E. Gorchakov, A. Masoni, I. Massa, Antonio Zoccoli, S. Marcello, L. Venturelli, Armando Lanaro, C. De Leo, V.G. Ableev, Sergio Serci, Michelangelo Agnello, G.C. Bonazzola, U. Marconi, Felice Iazzi, M. Poli, G. Vedovato, F. D'Isep, Nicola Semprini-Cesari, A. Saino, Corrado Cicalo, Elena Botta, P. Boccaccio, Paola Gianotti, G. Maron, G. Bendiscioli, Stefania Vecchi, Paola Salvini, M. Morando, A. Adamo, A.M. Rozhdestvensky, E. Lodi Rizzini, S. Costa, D. Panzieri, D. Yu. Denisov, B. Cereda, V.T. Tretyak, L. Vannucci, Gianfranco Zosi, C. Guaraldo, G. L. Usai, M. Lombardi, L. Ferrero, Adriano Fontana, M. Corradini, D. Calvo, G. Puddu, Alberto Rotondi, G. Pauli, Marco Bruschi, G. Piragino, Mauro Villa, D. Galli, A. Filippi, M. Capponi, Tullio Bressani, A. Vitale, Paolo Montagna, F. Balestra, F. Nichitiu, G. Belli, U. Gastaldi, R. A. Ricci, G. V. Margagliotti, Alessandro Feliciello, Antonietta Donzella, A. Grasso, E. Rossetto, R. Garfagnini, P. Cerello, B. Giacobbe, A. Bertin, F. Tosello, L. Santi, Maria Pia Bussa, S. Tessaro, L. Busso, V. Filippini, V. Lucherini, Aldo Zenoni, R. Spighi, S.N. Prakhov, L. Fava, V. G., Ableev, A., Adamo, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, E., Botta, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, B., Cereda, P., Cerello, C., Cicalò, M., Corradini, S., Costa, S., Castro, C., Leo, Denisov, D. Y. u., F., D’Isep, A., Donzella, L., Fava, A., Feliciello, L., Ferrero, A., Filippi, V., Filippini, A., Fontana, D., Galli, R., Garfagnini, U., Gastaldi, B., Giacobbe, P., Gianotti, O. E., Gorchakov, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, P., Montagna, M., Morando, F., Nichitiu, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, S. N., Prakhov, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, A., Saino, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, R., Spighi, Tessaro, Susanna, F., Tosello, V. T., Tretyak, G., Usai, L., Vannucci, S., Vecchi, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Physics, Particle physics, Annihilation, OZI-RULE, High Energy Physics::Phenomenology, antiproton deuterium annihilation, OZI rule, Nuclear physics, Deuterium, ANTIPROTON ANNIHILATION, Antiproton, High Energy Physics::Experiment, Physics::Atomic Physics, Nuclear Experiment
Abstract

The branching ratios of Φπ− and ωπ− final states were measured for the antiproton annihilation in gaseous deuterium at rest. A significant violation of the OZI rule was found.

Published
1994

24. Annihilation Cross-sections of Antineutrons On C, Al, Cu, Sn and Pb At Low Momenta (180-280 Mev/c) With the Obelix Spectrometer

Author

I. Massa, S. Marcello, F. D'Isep, G. L. Usai, M. Corradini, L. Vannucci, Umberto Marini Bettolo Marconi, Tullio Bressani, M. Morando, V. Filippini, Alberto Masoni, F. Nichitiu, Antonio Zoccoli, A.M. Rozhdestvensky, Felice Iazzi, U. Gastaldi, T. D. Galli, Corrado Cicalo, L. Venturelli, M. Lombardi, Aldo Zenoni, D. Calvo, P. Cerello, Mauro Villa, C. Deleo, Massimo Piccinini, M.G. Sapozhnikov, G. Pauli, Nicola Semprini-Cesari, F. Tosello, A. Bertin, S. Tessaro, D. Panzieri, G.C. Bonazzola, A. Grasso, M. Poli, V.G. Ableev, G. Vedovato, Paola Salvini, P.P. Temnikov, G. Belli, Marco Bruschi, Gianfranco Zosi, Paola Gianotti, S. Decastro, A. Filippi, Armando Lanaro, A. Adamo, V.I. Tretyak, Antonietta Donzella, L. Santi, Stefania Vecchi, A. Maggiora, Roberto Spighi, V. Lucherini, L. Fava, F. Balestra, Maria Pia Bussa, R. A. Ricci, A. Vitale, L. Busso, S. Costa, Elena Botta, B. Cereda, S. Serci, D. Y. Desinov, L. Ferrero, R. Garfagnini, Alberto Rotondi, D. Parena, Paolo Montagna, P. Boccaccio, G. Puddu, G. Bendiscioli, Benedetto Giacobbe, Michelangelo Agnello, S.N. Prakhov, E. Rossetto, C. Guaraldo, M. Capponi, G. Piragino, E. L. Rizzini, G. V. Margagliotti, Alessandro Feliciello, G. Maron, Bruno Minetti, V. G., Ableev, A., Adamo, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, E., Botta, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, B., Cereda, P., Cerello, C., Cicalò, M., Corradini, S., Costa, S., Castro, C., Leo, Desinov, D. Y. u., F., D’Isep, A., Donzella, L., Fava, A., Feliciello, L., Ferrero, A., Filippi, V., Filippini, T. D., Galli, R., Garfagnini, U., Gastaldi, B., Giacobbe, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, P., Montagna, M., Morando, F., Nichitiu, D., Panzieri, D., Parena, G., Pauli, M., Piccinini, G., Piragino, M., Poli, S. N., Prakhov, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, R., Spighi, P., Temnikov, S., Tessaro, F., Tosello, V. I., Tretyak, G. L., Usai, L., Vannucci, S., Vecchi, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Nuclear reaction, Physics, Particle physics, antineutron C annihilation, Large Hadron Collider, Annihilation, Spectrometer, Nucleon-induced reaction and scattering, ANTIPROTON-NUCLEUS INTERACTION, antineutron nuclei annhililation, antineutron Pb annihilation, ELASTIC-SCATTERING, Antineutron, Nuclear physics, antineutron Al annihilation, antineutron Sn annihilation, C/AL, antineutron Cu annihilation, General Agricultural and Biological Sciences, computer, computer.programming_language
Abstract

Annihilation cross-sections sigma(ann) for antineutrons on some nuclei (C, Al, Cu, Sn and Pb) at three antineutron momenta (180, 240 and 280 MeV/c) were measured at LEAR (CERN) with the OBELIX spectrometer. A behaviour sigma(ann) = = sigma0A(nu) has been found with nu almost-equal-to 2/3. The data are discussed following some models for antineutron-nucleus interaction.

Published
1994

25. Meson spectroscopy with S- and P-wave-dominant initial-state selection in anti-pp annihilation

Author

Ableev, V. G., Adamo, A., Agnello, M., Andrighetto, A., Balestra, F., Belli, G., Bendiscioli, G., Bertin, A., Boccaccio, P., Bonazzola, G. C., Botta, E., Bressani, T., Bruschi, M., Bussa, M. P., Busso, L., Calvo, D., Capponi, M., Cereda, B., Cerello, P., Cicalo, C., Corradini, M., Costa, S., Castro, S., Leo, C., Denisov, D. Y. u., D’Isep, F., Donzella, A., Fava, L., Feliciello, A., Ferrero, L., Filippi, A., Filippini, V., Fontana, A., Galli, T. D., Garfagnini, R., Gastaldi, U., Giacobbe, B., Gianotti, P., Grasso, A., Guaraldo, C., Iazzi, F., Lai, A., Lanaro, A., Lodi Rizzini, E., Lombardi, M., Lucherini, V., Maggiora, A., Marcello, S., Marconi, U., Margagliotti, Giacomo, Maron, G., Masoni, A., Massa, I., Minetti, B., Montagna, P., Morando, M., Musa, L., Nichitiu, F., Panzieri, D., Pauli, G., Piccinini, M., Piragino, G., Poli, M., Prakhov, S. N., Puddu, G., Ricci, R. A., Rossetto, E., Rotondi, A., Rozhdestvensky, A. M., Saino, A., Salvini, P., Santi, L., Sapozhnikov, M. G., Semprini Cesari, N., Serci, S., Spighi, R., Temnikov, P., Tessaro, Susanna, Tosello, F., Tretyak, V. I., Usai, G., Vannucci, L., Vecchi, S., Vedovato, G., Venturelli, L., Villa, M., Vitale, A., Zenoni, A., Zoccoli, A., Zosi, G., V. G., Ableev, A., Adamo, M., Agnello, A., Andrighetto, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, E., Botta, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, B., Cereda, P., Cerello, C., Cicalo, M., Corradini, S., Costa, S., Castro, C., Leo, Denisov, D. Y. u., F., D’Isep, A., Donzella, L., Fava, A., Feliciello, L., Ferrero, A., Filippi, V., Filippini, A., Fontana, T. D., Galli, R., Garfagnini, U., Gastaldi, B., Giacobbe, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lai, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, P., Montagna, M., Morando, L., Musa, F., Nichitiu, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, S. N., Prakhov, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, A., Saino, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, R., Spighi, P., Temnikov, Tessaro, Susanna, F., Tosello, V. I., Tretyak, G., Usai, L., Vannucci, S., Vecchi, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
anti-pp annihilation, Meson spectroscopy
Abstract

The possibility of selecting the initial angular-momentum state from which antiproton-proton annihilation at rest can occur can be a fundamental tool in meson spectroscopy. With the OBELIX detector different target systems have been employed, ranging fromS-wave toP-wave dominance. The preliminary results both on meson spectroscopy and branching ratio measurements are discussed.

Published
1994

26. Evidence of a new state at ∼ 1660 MeV/c2 observed in anti-np annihilations

Author

Ableev, V., Adamo, A., Agnello, M., Balestra, F., Belli, G., Bendiscioli, G., Bertin, A., Boccaccio, P., Bonazzola, G. C., Botta, E., Bressani, T., Bruschi, M., Bussa, M. P., Busso, L., Calvo, D., Capponi, M., Cereda, B., Cerello, P., Cicalò, C., Corradini, M., Costa, S., Castro, S., Leo, C., Denisov, D. Y. u., D’Isep, F., Donzella, A., Fava, L., Feliciello, A., Ferrero, L., Filippi, A., Filippini, V., Fontana, A., Galli, T. D., Garfagnini, R., Gastaldi, U., Giacobbe, B., Gianotti, P., Grasso, A., Guaraldo, C., Iazzi, F., Lanaro, A., Lodi Rizzini, E., Lombardi, M., Lucherini, V., Maggiora, A., Marcello, S., Marconi, U., Margagliotti, Giacomo, Maron, G., Masoni, A., Massa, I., Minetti, B., Montagna, P., Morando, M., Nichitiu, F., Panzieri, D., Pauli, G., Piccinini, M., Piragino, G., Poli, M., Prakhov, S. N., Puddu, G., Ricci, R. A., Rossetto, E., Rotondi, A., Rozhdestvensky, A. M., Saino, A., Salvini, P., Santi, L., Sapozhnikov, M. G., Semprini Cesari, N., Serci, S., Spighi, R., Temnikov, P., Tessaro, Susanna, Tosello, F., Tretyak, V. I., Usai, G., Vannucci, L., Vecchi, S., Vedovato, G., Venturelli, L., Villa, M., Vitale, A., Zenoni, A., Zoccoli, A., Zosi, G., V., Ableev, A., Adamo, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, E., Botta, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, B., Cereda, P., Cerello, C., Cicalò, M., Corradini, S., Costa, S., Castro, C., Leo, Denisov, D. Y. u., F., D’Isep, A., Donzella, L., Fava, A., Feliciello, L., Ferrero, A., Filippi, V., Filippini, A., Fontana, T. D., Galli, R., Garfagnini, U., Gastaldi, B., Giacobbe, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, P., Montagna, M., Morando, F., Nichitiu, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, S. N., Prakhov, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, A., Saino, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, R., Spighi, P., Temnikov, Tessaro, Susanna, F., Tosello, V. I., Tretyak, G., Usai, L., Vannucci, S., Vecchi, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Mesons and meson resonances
Abstract

A study of nˉp in-flight annihilations is presented. The 4π invariant mass spectrum resulting from the analysis of the five-prong exclusive events, following the annihilation of ∼ (100–297) MeV/c nˉ, reveals, besides a large structure centred at ∼ 1500 MeV/c2, some evidences for a new state around 1660 MeV/c2.

Published
1994

27. An experimental study of antiproton-4He annihilation at rest

Author

Adamo, A, Agnello, M, Balestra, F, Belli, G, Bendiscioli, G, Bertin, A, Boccaccio, P, Bonazzola, Gc, Bressani, T, Bruschi, M, Bussa, Mp, Busso, L, Calvo, D, Capponi, M, Cerello, P, Cicalo, C, Costa, S, Decastro, S, Disep, F, Donzella, A, Fava, L, Feliciello, A, Ferrero, L, Filippi, A, Filippini, V, Galli, D, Garfagnini, R, Gastaldi, U, Gianotti, P, Grasso, A, Guaraldo, C, Iazzi, F, Kharzeev, De, Lanaro, A, LODI RIZZINI, E, Lombardi, M, Lucherini, V, Maggiora, A, Marcello, S, Marconi, U, Margagliotti, Gv, Maron, G, Masoni, A, Massa, I, Minetti, B, Montagna, P, Morando, M, Nichitiu, F, Panzieri, D, Pauli, P, Piccinini, M, Piragino, G, Poli, M, Puddu, G, Ricci, Ra, Rossetto, E, Rotondi, A, Rozhdenstvensky, Am, Saino, A, Salvini, P, Santi, Lorenzo Gianni, Sapozhnikov, Mg, SEMPRINI CESARI, N, Serci, S, Spighi, R, Temnikov, Pp, Tessaro, S, Tosello, F, Tretyak, Vi, Usai, Gl, Vannucci, L, Vecchi, S, Vedovato, G, Venturelli, L, Villa, M, Vitale, A, Zenoni, A, Zoccoli, A, Zosi, G, RI Galli Domenico/A 1606 2012 Iazzi Felice/F 4490 2012 Villa Mauro/C 9883 2009 Filippi Alessandra/I 9530 2012, A., Adamo, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, P., Cerello, C., Cicalò, S., Costa, S., De Castro, F., D'Isep, A., Donzella, L., Fava, A., Feliciello, L., Ferrero, A., Filippi, V., Filippini, D., Galli, R., Garfagnini, U., Gastaldi, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, D. E., Kharzeev, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, P., Montagna, M., Morando, F., Nichitiu, D., Panzieri, P., Pauli, M., Piccinini, G., Piragino, M., Poli, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdenstvensky, A., Saino, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, R., Spighi, P. P., Temnikov, S., Tessaro, F., Tosello, V. I., Tretyak, G. L., Usai, L., Vannucci, S., Vecchi, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, STRANGENESS PRODUCTION, Annihilation, He target, STOPPED ANTIPROTONS, Nuclear physics, Pion, Pair production, Deuterium, Antiproton, Invariant mass, Atomic physics, Nuclear Experiment, Nucleon, antiproton annihilation
Abstract

This paper reports new experimental results on the annihilation of antiprotons stopped in a He-4 gas target. The measurement was carried out with the Obelix spectrometer installed at the LEAR machine of CERN. Main results can be-summarized as follows. (i) The invariant mass distribution of 2pi+2pi- produced at rest is similar to those from hydrogen and deuterium targets: the peak seen in recent experiments around 1150 MeV/c2 is absent. (ii) 2pi angular correlations are very close to those found for hydrogen. The nuclear structure does not modify remarkably the pion production and emission. (iii) pip and pp angular correlations are strongly peaked close to 180-degrees, in qualitative agreement with INC model predictions. (iv) The pp invariant mass distribution reveals events which may be due to eta(omega) absorption; the estimated upper limit for probability of eta and omega absorption is about 3 x 10(-3). (v) Events having features compatible with two-nucleon annihilations with production of heavy mesonic systems are detected both in the 2pi+2pi- and the 2pi-pi+ channels. The production rate of the 2pi+2pi-channel is of the order of 5 x 10(-3).

Published
1994

28. Hypernuclei production with stopped K- at DAΦNE

Author

Elena Botta, A. Lanaro, N. Grion, Rinaldo Rui, S. Marcello, F. D'Isep, Michelangelo Agnello, Bruno Minetti, V. Paticchio, Antonietta Donzella, S. Tessaro, A. Filippi, D. Calvo, E. Lodi Rizzini, E. Rossetto, Felice Iazzi, A. Sharma, Tullio Bressani, P. Gianotti, S. Costa, V. Lucherini, L. Venturelli, A. Zenoni, C. Guaraldo, Paolo Camerini, G. Bonazzola, A. Feliciello, M., Agnello, G. C., Bonazzola, E., Botta, T., Bressani, D., Calvo, Camerini, Paolo, S., Costa, F., D'Isep, A., Donzella, A., Feliciello, A., Filippi, P., Gianotti, N., Grion, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, V., Lucherini, S., Marcello, B., Minetti, V., Paticchio, E., Rossetto, Rui, Rinaldo, A., Sharma, S., Tessaro, L., Venturelli, and A., Zenoni

Subjects
hypernuclei, Nuclear physics, Physics, hypernuclear physics, kaons, Nuclear and High Energy Physics, Field (physics), Spectrometer, hypernuclear physic, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The low-energy, background free and tagged K-following the o(1020) decay produced at the DAΦNE o-factory in Frascati represent a unique opportunity to carry out a dedicated program of hypernuclear physics with K − at rest. In this paper we give a survey of this challenging field and we describe the performances of a magnetic spectrometer designed for precise measurements of hypernuclei energy levels and of their decays modes.

Published
1993

29. Antinucleon-nucleon annihilation cross section measurements at low energies

Author

A. Masoni, Felice Iazzi, Corrado Cicalo, G. Maron, A. Bertin, U. Marconi, L. Vannucci, G. V. Margagliotti, Bruno Minetti, A. Vitale, M. Lombardi, Sergio Serci, Nicola Semprini-Cesari, Michelangelo Agnello, L. Fava, G. Piragino, Antonio Zoccoli, S. De Castro, A. Filippi, D. Galli, M.G. Sapozhnikov, C. Guaraldo, E. Lodi Rizzini, V. Filippini, S. Tessaro, D. Panzieri, M. Capponi, G. Pauli, V. Lucherini, S. Costa, A. Maggiora, P. Gianotti, A.M. Rozhdestvensky, D. Calvo, Mauro Villa, V.I. Tretyak, A. Grasso, P.P. Temnikov, M.P. Bussa, Gianfranco Zosi, G. Bendiscioli, A. Adamo, Tullio Bressani, A. Zenoni, G.C. Bonazzola, G. Puddu, M. Morando, U. Gastaldi, Stefania Vecchi, Paola Salvini, Piergiorgio Cerello, E. Rossetto, L. Santi, Marco Bruschi, M. Poli, G. Vedovato, R. A. Ricci, P. Boccaccio, F. Balestra, Maurizio Piccinini, Armando Lanaro, L. Ferrero, L. Venturelli, F. Tosello, A. Feliciello, Alberto Rotondi, I. Massa, S. Marcello, F. D'Isep, G. L. Usai, R. Garfagnini, L. Busso, Paolo Montagna, F. Nichitiug, A., Adamo, M., Agnello, F., Balestra, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, P., Cerello, C., Cicalo, S., Costa, S., De Castro, F., D'Isep, L., Fava, A., Feliciello, L., Ferrero, A., Filippi, V., Filippini, D., Galli, R., Garfagnini, U., Gastaldi, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, P., Montagna, M., Morando, F., Nichitiug, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, P., Temnikov, Tessaro, Susanna, F., Tosello, V. I., Tretyak, G. L., Usai, L., Vannucci, S., Vecchi, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Annihilation, Spectrometer, anti nucleon annihilation, Oelix, P wave, Nuclear physics, Cross section (physics), Low energy, Atomic physics, Nucleon
Abstract

First results concerning p -p and n -p annihilation cross section and n -p total cross sections at low energies ( 2.25 ≤ E P ≤ 22.76 MeV and 3.4 E n MeV ) obtained by the OBELIX spectrometer are reported. The agreement with the few existing data in this energy range is good; the comparison with some models gives interesting indications on the S and P wave contribution at very low energy and on the range of the elastic interaction.

Published
1993

30. New results on meson spectroscopy from Obelix

Author

L. Ferrero, A. Feliciello, Alberto Rotondi, G. Pauli, Felice Iazzi, Corrado Cicalo, Paola Salvini, Sergio Serci, Michelangelo Agnello, L. Busso, G. Piragino, S. Tessaro, D. Galli, P. Boccaccio, N. Semprini Cesari, G. Bonazzola, R. Garfagnini, L. Santi, A.M. Rozhdestvensky, D. Calvo, S. Costa, R. A. Ricci, Paolo Montagna, B. Cereda, M. Capponi, Petar Temnikov, Tullio Bressani, A. Bertin, V. Filippini, Gianfranco Zosi, U. Gastaldi, A. Masoni, A. Vitale, F. Nichitiu, Antonio Zoccoli, G. L. Usai, P. Cerello, Aldo Zenoni, M.P. Bussa, B. Giacobbe, A. Grasso, M. Poli, I. Massa, G. Vedovato, Stefania Vecchi, V. L. Trelyak, A. Maggiora, S. Marcello, Maurizio Piccinini, F. Balestra, L. Venturelli, G. Bendiscioli, F. Tosello, Bruno Minetti, F. D' Isep, Armando Lanaro, P. Gianotti, A. Adamo, Mauro Villa, Marco Bruschi, L. Vannucci, L. Fava, M. Lombardi, G. V. Margagliotti, M.G. Sapozhnikov, C. Guaraldo, V. Lucherini, U. Marconi, G. Maron, E. Lodi Rizzini, G. Puddu, E. Rossetto, M. Morando, S. De Castro, A. Filippi, D. Panzieri, A., Lanaro, A., Adamo, M., Agnello, F., Balestra, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M. Bruschi M. P., Bussa, L., Busso, D., Calvo, M., Capponi, B., Cereda, P., Cerello, C., Cicalo, S., Costa, S., De Castro, F., D'Isep, L., Fava, A., Feliciello, L., Ferrero, A., Filippi, V., Filippini, D., Galli, R., Garfagnini, U., Gastaldi, B., Giacobbe, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, P., Montagna, M., Morando, F., Nichitiu, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, P., Temnikov, Tessaro, Susanna, F., Tosello, V. I., Tretyak, G., Usai, L., Vannucci, S., Vecchi, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Particle decay, Annihilation, Pion, Meson, Hadron, Dalitz plot, Quarkonium, Spin (physics), Meson spectroscopy
Abstract

A preliminary final state analysis of a sample of n p in-flight annihilations into three and five charged pions is presented. The partial-wave analysis of three-prong data confirms previous interpretations of the Ax ƒ 2 (1520) resonance, from p p annihilations at rest. Concerning five-prong events our analysis favours spin 0 for the already reported ζ (1480) state, but more refined calculations are underway. At high n momenta, the five-prong data show some evidence for a possible spin 2 state at 1640 MeV/c 2 decaying in ρ ° ρ °.

Published
1993

31. Protonium annihilation in P-wave using low-density (ϱ/ϱ∼10−3) hydrogen targets. Measurements of cascade times and widths

Author

G. L. Usai, I. Massa, S. Marcello, N. Semprini Cesari, L. Santi, F. D'Isep, I.V. Falomkin, Bruno Minetti, A. Zenomi, Paolo Montagna, A. Maggiora, C. Guaraldo, G. Bonazzola, Felice Iazzi, Antonio Zoccoli, A. Grasso, V. Lucherini, Michelangelo Agnello, M. Morando, P.P. Temnikov, L. Fava, M. Lombardi, A.M. Rozhdestvensky, G. Piragino, Gianfranco Zosi, S. De Castro, Corrado Cicalo, M. Corradini, P. Gianotti, A. Adamo, G. Pauli, M.G. Sapozhnikov, S. Serci, G. V. Margagliotti, Marco Bruschi, F. Nichitiu, L. Busso, Alberto Masoni, L. Venturelli, D. Galli, G. Bendiscioli, Armando Lanaro, V.I. Tretyak, R. A. Ricci, M.P. Bussa, D. Panzieri, E. Lodi Rizzini, M. Capponi, Tullio Bressani, G. Maron, S. Costa, G. Puddu, M. Piccinini, U. Gastaldi, F. Tosello, M. Poli, G. Vedovato, S. Tessaro, E. Rossetto, G.B. Pontecorvo, I. D'Antone, D. Calvo, Mauro Villa, L. Ferrero, A. Bertin, R. Garfagnini, Alberto Rotondi, A. Feliciello, P. Boccaccio, U. Marconi, V. Filippini, A. Vitale, G. Zavattini, F. Balestra, Paola Salvini, L. Vannucci, G. Belli, A., Adamo, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, C., Cicaló, M., Corradini, S., Costa, I., D'Antone, S., De Castro, F., D'Isep, I. V., Falomkin, L., Fava, A., Feliciello, L., Ferrero, V., Filippini, D., Galli, R., Garfagnini, U., Gastaldi, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, M., Morando, P., Montagna, F., Nichitiu, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, G. B., Pontecorvo, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, P., Temnikov, S., Tessaro, F., Tosello, V. I., Tretyak, G. L., Usai, L., Vannucci, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, G., Zavattini, A., Zenomi, A., Zoccoli, and G., Zosi

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Annihilation, Hydrogen, P wave, chemistry.chemical_element, ANTIPROTONIC-HYDROGEN, chemistry, Cascade, Protonium, Atom, PBARP ANNIHILATION, Low density, Atomic physics
Abstract

The use of low-density hydrogen targets is demonstrated experimentally to be a new way of selecting protonium ( p p atom) annihilations with initial angular momentum L = 1. The mean value and the width of the time distributions which occur between protonium formation and annihilation have been measured at room temperature at 8.2, 4.1, 2.1 mbar. They are (110±10; 45±5), (145±15; 82±9) and (210±25;125±9) ns, respectively.

Published
1992

32. Observation of structures in the four pion invariant mass in anti-proton He-4 annihilation at rest (Obelix data, PS201 experiment at LEAR)

Author

Adamo, A., Agnello, M., Balestra, F., Belli, G., Bendiscioli, G., Bertin, A., Boccaccio, P., Bonazzola, G. C., Bressani, T., Bussa, M. Bruschi M. P., Busso, L., Calvo, D., Capponi, M., Corradini, M., Costa, S., De Castro, S., D'Isep, F., Falomkin, I. V., Fava, L., Feliciello, A., Ferrero, L., Filippini, V., Garfagnini, R., Gastaldi, U., Gianotti, P., Grasso, A., Guaraldo, C., Iazzi, F., Lanaro, A., Lodi Rizzini, E., Lombardi, M., Maggiora, A., Marcello, S., Marconi, U., Margagliotti, Giacomo, Maron, G., Masoni, A., Massa, I., Minetti, B., Morando, M., Morganti, M., Panzieri, D., Pauli, G., Piccinini, M., Piragino, G., Poli, M., Pontecorvo, G. B., Puddu, G., Ricci, R. A., Rotondi, A., Rozhdestvensky, A. M., Salvini, P., Santi, L., Sapozhnikov, M. G., Semprini Cesari, N., Serci, S., Temnikov, P., Tosello, F., Tretyak, V. I., Vannucci, L., Vedovato, G., Venturelli, L., Vitale, A., Zenoni, A., Zoccoli, A., Zosi, G., A., Adamo, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M. Bruschi M. P., Bussa, L., Busso, D., Calvo, M., Capponi, M., Corradini, S., Costa, S., De Castro, F., D'Isep, I. V., Falomkin, L., Fava, A., Feliciello, L., Ferrero, V., Filippini, R., Garfagnini, U., Gastaldi, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, M., Morando, M., Morganti, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, G. B., Pontecorvo, G., Puddu, R. A., Ricci, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, P., Temnikov, F., Tosello, V. I., Tretyak, L., Vannucci, G., Vedovato, L., Venturelli, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
pbar
Abstract

Two sharp structures at about 1200 MeV/c2 and 1400 MeV/c2 are observed in the pi+-pi--pi+-pi--system invariant mass in antiproton-He-4 annihilation at rest. No similar signals are seen in the corresponding antiproton-proton data. A similar observation has been made in the streamer chamber data.

Published
1992

33. Meson spectroscopy with antineutrons

Author

Paola Salvini, L. Ferrero, Alberto Rotondi, S. De Castro, P. Gianotti, Maurizio Piccinini, Bruno Minetti, A. Adamo, D. Galli, M. Morando, G. Bonazzola, D. Panzieri, P. Boccaccio, Marco Bruschi, Mp Bussa, A.M. Rozhdestvensky, G. Puddu, A. Feliciello, L. Busso, M. Poli, G. Vedovato, Antonio Zoccoli, D. Calvo, R. A. Ricci, E. Lodi Rizzini, E. Rossetto, V.I. Tretyak, Sergio Serci, Michelangelo Agnello, U. Marconi, L. Fava, Armando Lanaro, M. Capponi, A. Bertin, G. Maron, G. V. Margagliotti, L. Vannucci, U. Gastaldi, F. Balestra, M. Corradini, M.G. Sapozhnikov, M. Lombardi, P.P. Temnikov, Gianfranco Zosi, A. Grasso, C. Guaraldo, F. Nichitiu, A. Zenoni, G. Piragino, V. Lucherini, N. Semprini Cesari, L. Santi, L. Venturelli, T. Bressani, F. Tosello, I. Massa, S. Marcello, F. D'Isep, A. Masoni, G. Bendiscioli, G. Pauli, S. Costa, R. Garfagnini, Felice Iazzi, V. Filippini, S. Tessaro, G. Belli, G. Zavattini, A. Vitale, A. Maggiora, A., Adamo, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, M., Corradini, S., Costa, S., De Castro, F., D'Isep, L., Fava, A., Feliciello, L., Ferrero, V., Filippini, D., Galli, R., Garfagnini, U., Gastaldi, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, M., Morando, F., Nichitiu, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, P., Temnikov, S., Tessaro, F., Tosello, V. I., Tretyak, L., Vannucci, G., Vedovato, L., Venturelli, A., Vitale, G., Zavattini, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Physics, Nuclear and High Energy Physics, Annihilation, Hydrogen, Meson, ANNIHILATIONS, chemistry.chemical_element, Elementary particle, Antineutron, meson spectroscopy, antineutron proton annhilation, Nuclear physics, Momentum, chemistry, Invariant mass, Atomic physics, Spectroscopy
Abstract

First results on meson spectroscopy using antineutrons as projectiles are reported. Three-body (π + π + π − ) and five-body (π + π + π + π − π − ) final states following the annihilation of 100 to 290 MeV/ c antineutrons on hydrogen were analyzed. The (π + π − ) invariant mass spectrum in the three-body reaction is accounted for by the ϱ 0 anf f 2 (1270) resonances, together with an enhancement around 1540 MeV, in the region of the AX (1565) and the f 2 (1515) resonances, whereas the best fit for the (π + π + π − π − ) invariant mass in five-body events shows the already reported structure ζ(1480) and suggests the presence of a second structure around 1650 MeV.

Published
1992

34. Measurement of the Pbarp Annihilation Cross-sections At Very Low Energies

Author

M. Corradini, L. Ferrero, S. Marcello, U. Marconi, Felice Iazzi, A. Vitale, Alberto Rotondi, D. Panzieri, D. Calvo, V. Filippini, G. Bendiscioli, I.V. Falomkin, M. Lombardi, R. A. Ricci, G.B. Pontecorvo, G. Maron, M. Masala, P. Gianotti, M.G. Sapozhnikov, Bruno Minetti, A. Feliciello, R. Piragino, G. Puddu, M. Capponi, G. V. Margagliotti, P. Boccaccio, M.P. Macciotta, D. D'Isep, M. Morando, S. Costa, Michelangelo Agnello, F. Tosello, U. Gastaldi, Marco Bruschi, G. Pauli, Gianfranco Zosi, A. Zenoni, Paola Salvini, V.I. Tretyak, Armando Lanaro, G. Sartori, R. Garfagnini, A. Maggiora, Antonio Zoccoli, L. Venturelli, Alberto Masoni, T. Bressani, M. Morganti, Nicola Semprini-Cesari, I. Massa, L. Santi, C. Guaraldo, Maurizio Piccinini, M.P. Bussa, M. Poli, G. Vedovato, L. Vannucci, G. Bonazzola, A.M. Rozhdestvensky, L. Busso, L. Fava, S. De Castro, G. Belli, S. Serci, E. Lodi Rizzini, A. Bertin, F. Balestra, A. Grasso, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, M., Corradini, S., Costa, S., De Castro, D., D'Isep, I. V., Falomkin, L., Fava, A., Feliciello, L., Ferrero, V., Filippini, R., Garfagnini, U., Gastaldi, P., Gianotti, A., Grasso, C., Guaraldo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, M. P., Macciotta, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, M., Masala, A., Masoni, I., Massa, B., Minetti, M., Morando, M., Morganti, D., Panzieri, G., Pauli, M., Piccinini, R., Piragino, M., Poli, G. B., Pontecorvo, G., Puddu, R. A., Ricci, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, G., Sartori, N., Semprini Cesari, S., Serci, F., Tosello, V. I., Tretyak, L., Vannucci, G., Vedovato, L., Venturelli, A., Vitale, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
Physics, Nuclear and High Energy Physics, Annihilation, Meson, Spectrometer, cross sections, Scattering length, SCATTERING, PBARP ANNIHILATION, Nuclear physics, antiproton proton annihilation, OBELIX, PS201, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Order of magnitude
Abstract

The p p annihilation cross-sections at 66.4–68.9–71.4 MeV/c have been measured using the presently instrumented part of the OBELIX spectrometer. The results have been obtained at p energies ( ≃ 2.5 MeV) by one order of magnitude smaller than in any existing experiment concerning the in-flight antiproton-proton annihilation. The average value obtained over the total interval 65.1–72.5 MeV/c, βσanT = 33.2 ± 1.7 (stat.) ±1.8 (syst.) mb, in agreement with a specific calculation, would favour for the spin-averaged S-wave scattering length the value (−0.7 + i0.8) fm. The branching ratios for the annihilations in two, four and six charged mesons turn out to be quite similar to those for annihilation at rest in liquid hydrogen.

Published
1991

35. First physics results from OBELIX

Author

Adamo, A., Agnello, M., Balestra, F., Belli, G., Bendiscioli, G., Bertin, A., Boccaccio, P., Bonazzola, G. C., Bressani, T., Bruschi, M., Bussa, M. P., Busso, L., Calvo, D., Capponi, M., Cicalo, C., Corradini, M., Costa, S., D Antone, I., Castro, S., D Isep, F., Falomkin, I. V., Fava, L., Feliciello, A., Ferrero, L., Filippini, V., Galli, D., Garfagnini, R., Gastaldi, U., Gianotti, P., Grasso, A., Guarolo, C., Iazzi, F., Lanaro, A., Lodi Rizzini, E., Lombardi, M., Lucherini, V., Maggiora, A., Marcello, S., Marconi, U., Margagliotti, G. V., Maron, G., Masoni, A., Massa, I., Minetti, B., Morando, M., Montagna, P., Nichitiu, F., Panzieri, D., Pauli, G., Piccinini, M., Piragino, G., Poli, M., Pontecorvo, G. B., Puddu, G., Ricci, R. A., Rossetto, E., Rotondi, A., Rozhdestvensky, A. M., Salvini, P., Santi, L., Sapozhnikov, M. G., Semprini-Cesari, N., Serci, S., Temnikov, P., Tessaro, S., Tosello, F., Tretyak, V. I., Gianluca Usai, Vannucci, L., Vedovato, G., Venturelli, L., Villa, M., Vitale, A., Zavattini, G., Zenoni, A., Zoccoli, A., Zosi, G., A., Adamo, M., Agnello, F., Balestra, G., Belli, G., Bendiscioli, A., Bertin, P., Boccaccio, G. C., Bonazzola, T., Bressani, M., Bruschi, M. P., Bussa, L., Busso, D., Calvo, M., Capponi, C., Cicalo, M., Corradini, S., Costa, I., D'Antone, S., De Castro, F., D'Isep, I. V., Falomkin, L., Fava, A., Feliciello, L., Ferrero, V., Filippini, D., Galli, R., Garfagnini, U., Gastaldi, P., Gianotti, A., Grasso, C., Guarolo, F., Iazzi, A., Lanaro, E., Lodi Rizzini, M., Lombardi, V., Lucherini, A., Maggiora, S., Marcello, U., Marconi, Margagliotti, Giacomo, G., Maron, A., Masoni, I., Massa, B., Minetti, M., Morando, P., Montagna, F., Nichitiu, D., Panzieri, G., Pauli, M., Piccinini, G., Piragino, M., Poli, G. B., Pontecorvo, G., Puddu, R. A., Ricci, E., Rossetto, A., Rotondi, A. M., Rozhdestvensky, P., Salvini, L., Santi, M. G., Sapozhnikov, N., Semprini Cesari, S., Serci, P., Temnikov, Tessaro, Susanna, F., Tosello, V. I., Tretyak, G. L., Usai, L., Vannucci, G., Vedovato, L., Venturelli, M., Villa, A., Vitale, G., Zavattini, A., Zenoni, A., Zoccoli, and G., Zosi

Subjects
pbar-p annihilations
Abstract

First physics results from OBELIX

Catalog

Books, media, physical & digital resources
See catalog results