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59 results on '"E., Lodi Rizzini"'

1. PO-1027 Radioiodine therapy guided by 124I-PET/CT in metastatic DTC: long-term follow-up data

Author

Lucia Zanoni, Giovanni Frezza, F. Bertini, E. Deraco, Silvia Cammelli, L. Cavallini, Alessio G. Morganti, Vincenzo Allegri, D. Vallerossa, Andrea Repaci, Lidia Strigari, V. Laghi, Elena Tabacchi, Fabio Monari, C. Scampoli, E. Lodi Rizzini, and Stefano Fanti

Subjects
PET-CT, medicine.medical_specialty, Oncology, Long term follow up, business.industry, medicine, Radiology, Nuclear Medicine and imaging, Radioiodine therapy, Hematology, Radiology, business
Published
2021

2. PO-1023 Impact of 18F-FDG-PET/CT in the management of suspected RAI refractory DTC persistence/recurrence

Author

D. Vallerossa, C. Scampoli, E. Scirocco, Elena Tabacchi, Lucia Zanoni, Fabio Monari, Alessio G. Morganti, Giovanni Frezza, E. Lodi Rizzini, Andrea Repaci, V. Laghi, N. Razganiayeva, Silvia Cammelli, Raffaele Cardano, L. Cavallini, and Stefano Fanti

Subjects
medicine.medical_specialty, Oncology, Refractory, business.industry, medicine, Radiology, Nuclear Medicine and imaging, Fdg pet ct, Hematology, Radiology, business, Persistence (computer science)
Published
2021

3. PO-1394 Stereotactic body radiotherapy for prostate cancer lymph node metastases: a systematic review

Author

F. Deodato, G. Tolento, M. Boccardi, C.M. Donati, A. Re, Gabriella Macchia, M. Buwenge, Alessio G. Morganti, M. Bonetti, Alice Zamagni, Savino Cilla, E. Lodi Rizzini, Silvia Cammelli, and M. Ntreta

Subjects
medicine.medical_specialty, Prostate cancer, medicine.anatomical_structure, Oncology, business.industry, medicine, Radiology, Nuclear Medicine and imaging, Hematology, Radiology, medicine.disease, business, Lymph node, Stereotactic body radiotherapy
Published
2021

4. PO-1239 99mTc-macroaggregated albumin SPECT/CT in HCC treated with Selective Internal Radiation Therapy

Author

Stefano Fanti, E. Lodi Rizzini, L. Cavallini, V. Laghi, Alessio G. Morganti, Giovanni Frezza, E. Deraco, Chiara Bellarosa, Silvia Cammelli, Lidia Strigari, S. Strolin, Fabio Monari, Rita Golfieri, D. Vallerossa, and C. Scampoli

Subjects
Oncology, business.industry, Selective internal radiation therapy, Medicine, Radiology, Nuclear Medicine and imaging, Macroaggregated albumin, Hematology, business, Nuclear medicine
Published
2021

6. PO-1022 Local-control efficacy of EBRT on well-DTC bone metastases: single center real-life experience

Author

Giovanni Frezza, E. Deraco, E. Lodi Rizzini, A.L. Angelini, D. Vallerossa, Silvia Cammelli, L. Cavallini, Elena Tabacchi, Alessio G. Morganti, E. Scirocco, Fabio Monari, F. Romani, C. Scampoli, M. Boriani, and V. Laghi

Subjects
medicine.medical_specialty, Oncology, business.industry, Medicine, Radiology, Nuclear Medicine and imaging, Hematology, Radiology, business, Single Center
Published
2021

7. Limits on antiproton-nuclei annihilation cross sections at ∼125 keV

Author

E. Vallazza, D. Seiler, D. De Salvador, Daniel Barna, Masaki Hori, M. Leali, Ryugo S. Hayano, M. Corradini, M. Prest, L. Venturelli, Anna Sótér, E. Lodi-Rizzini, Valerio Mascagna, K. Todoroki, and Hossein Aghai-Khozani

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Annihilation, 010308 nuclear & particles physics, media_common.quotation_subject, Kinetic energy, 01 natural sciences, Asymmetry, Nuclear physics, Antiproton, Antimatter, 0103 physical sciences, 010306 general physics, media_common
Abstract

Some experimental limits on the annihilation cross sections σ ann of antiprotons on carbon, palladium, and platinum targets were determined at the previously unexplored kinetic energy region E ≈ 125 keV. Information on σ ann at such low antiproton energies is important in understanding the dynamics of the annihilation process, and provides useful data for models that attempt to describe the matter-antimatter asymmetry in the universe by assuming the existence of islands of antimatter concentration.

Published
2021

8. 223Ra-chloride therapy: the first multidisciplinary and multicenter Italian study

Author

Laura Galli, Duccio Volterrani, Giuseppe Boni, Andrea Sbrana, Eugenio Borsatti, Stefano Fanti, E. Lodi Rizzini, Federico Paolieri, Valeria Dionisi, C. Cianci, Roberto Bortolus, Sara Mazzarri, F. Bloise, Elisa Biasco, Fabio Monari, Pietro Ghedini, L. Fratino, A. Falcone, Carlo Gobitti, S. Ricci, and A. Farnesi

Subjects
medicine.medical_specialty, Oncology, business.industry, Multidisciplinary approach, Medicine, Hematology, business, Intensive care medicine, Chloride, medicine.drug
Published
2017

9. Operation and performance of the FAST detector at the AD machine

Author

M. Prest, Nicola Zurlo, Davide Bolognini, L. Venturelli, E. Lodi Rizzini, M. Leali, E. Vallazza, V. Mascagna, A. Mozzanica, and M. Corradini

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Detector, Scintillating tracker, antiproton decelerator, ASACUSA, multianode PMT, Cosmic ray, Atomic and Molecular Physics, and Optics, Particle detector, Antiproton Decelerator, Nuclear physics, Antiproton, Antimatter, Physics::Accelerator Physics, High Energy Physics::Experiment, Beam (structure)
Abstract

The FAST (Fiber Antiproton Scintillating Tracker) detector has been installed at the Antiproton Decelerator at the CERN PS. Its goal is the measurement of the annihilation cross section of slow antiprotons (around 5 MeV) in gaseous targets in the ASACUSA experiment. FAST has to reconstruct the charged pions tracks to identify the annihilation vertices. The detector consists of 2 axial and 4 stereo layers of scintillating fibers. Each layer is built with 1 mm 50 cm long BCF-10 fibers readout by 64 channel multianode PMTs for a total of 2688 readout channels. The anode outputs, amplified and discriminated, are sampled with a 320 MHz clock inside a Cyclone II FPGA by Altera, in order to retrieve the time information of each hit. The readout system is designed to cope with a spilled beam which lasts 250 ns every minute. The expected number of events per spill was around 10. This paper will describe the operation and the performance of the FAST detector during the tests with cosmic rays (August 2006) and during the data taking on the beam (September 2006).

Published
2007

10. Search for the pentaquark in antiproton 4He annihilation at rest

Author

Piergiorgio Cerello, G. Puddu, M. Corradini, Felice Iazzi, C. Guaraldo, Corrado Cicalo, Adriano Fontana, A.M. Rozhdestvensky, L. Busso, L. Venturelli, A. Feliciello, Alberto Masoni, D. Calvo, Aldo Zenoni, Paola Salvini, Bruno Minetti, Armando Lanaro, V.I. Tretyak, A. Maggiora, L. Ferrero, S.N. Prakhov, S. Costa, O.E. Gorchakov, R. Garfagnini, G. L. Usai, Alberto Rotondi, V. Lucherini, Antonietta Donzella, Michelangelo Agnello, O. Y. Denisov, Paolo Montagna, M.P. Bussa, L. Lavezzi, D. Panzieri, Tullio Bressani, Elena Botta, Catalina Curceanu, E. Lodi Rizzini, S. Serci, G. Bendiscioli, A. Filippi, A. Grasso, A. Panzarasa, F. Balestra, S. Marcello, G. M. Sapozhnikov, A. De Falco, P. Gianotti, and F. Tosello

Subjects
Baryon, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Antiproton, Invariant mass, Strangeness, Nuclear Experiment, Nucleon, Resonance (particle physics), Pentaquark
Abstract

A research has been made to look for a signature of the positive-strangeness baryon resonance Θ + ( 1530 ) , which is expected to decay into p K 0 . A peak is observed in the p π + π − invariant mass distribution in antiproton– 4 He annihilation reactions at rest with production of two π + π − pairs with invariant mass close to the K S 0 mass. The annihilation reactions on 4 He can involve two to four nucleons producing an energy blob characterized by high strangeness content. The peak is centred around 1560.0 ± 3.7 MeV and its width is very narrow. The statistical significance is 2.7; this value is considered of not sufficient significance to claim support of the Θ + . The data were collected with the Obelix spectrometer at the LEAR machine of CERN.

Published
2006

11. 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

12. The first cold antihydrogen

Author

E. Lodi Rizzini, H. Pruys, P. Genova, V. Lagomarsino, L. V. Jørgensen, M. Macri, M. Charlton, Germano Bonomi, R. Landua, P. Montagna, Ryugo S. Hayano, V. Filippini, G. Testera, Alberto Rotondi, Alessandro Variola, J. S. Hangst, D. Lindelöf, C. L. Cesar, Yasunori Yamazaki, Michael Doser, M. Amoretti, Claude Amsler, P. D. Bowe, C. Carraro, M. C. Fujiwara, M. Marchesotti, R. Funakoshi, Adriano Fontana, Adam Bouchta, D. P. van der Werf, Niels Madsen, Petra Riedler, and C. Regenfus

Subjects
Physics::General Physics, Nuclear and High Energy Physics, CPT symmetry, Other Fields of Physics, FOS: Physical sciences, Penning traps, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Low energy, Positron, Antihydrogen, Cooling, CPT invariance, Slow muons, Bound state, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, Instrumentation, Physics, Antiproton, Antimatter
Abstract

Antihydrogen, the atomic bound state of an antiproton and a positron, was produced at low energy for the first time by the ATHENA experiment, marking an important first step for precision studies of atomic antimatter. This paper describes the first production and some subsequent developments., Invitated Talk at COOL03, International Workshop on Beam Cooling and Related Topics, to be published in NIM A

Published
2004

13. Production and detection of cold antihydrogen atoms

Author

V. Filippini, G. Testera, G. Manuzio, M. Amoretti, C. Regenfus, P. Genova, Alessandro Variola, J. S. Hangst, Germano Bonomi, Michael Doser, R. Landua, Ryugo S. Hayano, E. Lodi Rizzini, D. Lindelöf, Adam Bouchta, Adriano Fontana, Claude Amsler, M. Macri, D. P. van der Werf, P. Montagna, Niels Madsen, H. Pruys, P. D. Bowe, L. V. Jørgensen, C. L. Cesar, V. Lagomarsino, C. Carraro, M. C. Fujiwara, R. Funakoshi, M. Charlton, and Alberto Rotondi

Subjects
Condensed Matter::Quantum Gases, Physics, Physics::General Physics, Nuclear and High Energy Physics, Annihilation, Large Hadron Collider, Non-neutral plasmas, Particle detector, Antiproton Decelerator, Nuclear physics, Positron, Antiproton, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics, Atomic physics, Antihydrogen, Instrumentation
Abstract

The production and observation of cold antihydrogen atoms have been recently reported by the ATHENA experiment at the CERN Antiproton Decelerator. The antiatoms were produced by mixing low-energy antiprotons and positrons in an electromagnetic trap. The antihydrogen detection is based on the observation of a characteristic signature in the annihilation of the neutral antiatoms on the trap walls by means of an imaging particle detector. An overview of the apparatus is given and the results obtained are discussed.

Published
2004

14. First production and detection of cold antihydrogen atoms

Author

Niels Madsen, Germano Bonomi, E. Lodi Rizzini, Claude Amsler, C. L. Cesar, Alberto Rotondi, P. Rielder, M. Amoretti, P. Genova, M. Charlton, P. Montagna, Adam Bouchta, M. Marchesotti, R. Landua, G. Testera, D. P. van der Werf, Alessandro Variola, J. S. Hangst, Michael Doser, V. Lagomarsino, Adriano Fontana, C. Regenfus, C. Carraro, V. Filippini, M. C. Fujiwara, R. Funakoshi, P. D. Bowe, Ryugo S. Hayano, D. Lindelöf, H. Pruys, L. V. Jørgensen, and M. Macri

Subjects
Nuclear physics, Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Particle physics, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Antihydrogen, Nuclear Experiment, Instrumentation, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract

The ATHENA experiment recently produced the first atoms of cold antihydrogen. This paper gives a brief review of how this was achieved., Invited talk at Int. Conf. on Low Energy Antiprotons 2003 (LEAP03), to be published in NIM B

Published
2004

15. 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

16. On the formation and decay of the atomcule

Author

F. Balestra, C. Petrascu, L. Santi, Antonietta Donzella, Armando Lanaro, M.P. Bussa, Germano Bonomi, C. Guaraldo, O. Y. Denisov, V. Lucherini, A.M. Rozhdestvensky, E. Lodi Rizzini, A. Grasso, M. Maggiora, Gianfranco Zosi, L. Busso, G. Piragino, G. V. Margagliotti, M.L. Colantoni, S.N. Prakhov, R. Vilar, M. Corradini, F. Tosello, S. Tessaro, L. Ferrero, G. Gomez, Andrea Bianconi, P. Gianotti, R. Garfagnini, L. Venturelli, V.I. Tretyak, A. Maggiora, and O.E. Gorchakov

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Microsecond, Large Hadron Collider, Metastability, Atomic physics, Nanosecond, Exotic atom, Bar (unit)
Abstract

Up to now it has been observed that a fraction of about 3% of the p 's stopped in a dense He target survives for a surprisingly long time (tens of microseconds). As suggested by Condo in 1964 the long lifetime of p 's in He is explained by the existence of metastable states of the exotic atom p He + . An analysis of data from p 's stopped in He targets at 3 bar pressure by the Obelix apparatus at the LEAR decelerator at CERN is presented. We do not observe any significative amount of “prompt” annihilations (few nanoseconds) after the p 's capture.

Published
2001

17. Contribution from and waves in annihilation at rest

Author

G. Puddu, Sergio Serci, Michelangelo Agnello, N. Mirfakhrai, P. Montagna, M.P. Bussa, L. Ferrero, Stefania Vecchi, Alberto Rotondi, E. Lodi Rizzini, C. Petrascu, Andrea Bianconi, A.E. Kudryavtsev, G. L. Usai, I. Massa, S. Marcello, Felice Iazzi, A. Masoni, A. Bertin, M. Poli, S. De Castro, A. Filippi, Corrado Cicalo, R. Donà, Germano Bonomi, S.N. Prakhov, A. Feliciello, R. Spighi, Paola Gianotti, D. D'Isep, Marco Bruschi, Mauro Villa, Armando Lanaro, D. Panzieri, L. Venturelli, F. Tosello, Adriano Fontana, V. Filippini, D. Galli, S. Tessaro, B. Giacobbe, A. Grasso, A.M. Rozhdestvensky, V.I. Tretyak, Vincenzo Vagnoni, V. Lucherini, Maurizio Piccinini, Aldo Zenoni, S. Costa, U. Marconi, A. Vitale, Elena Botta, Paola Salvini, A. Maggiora, O.E. Gorchakov, F. Balestra, A. De Falco, G. Bendiscioli, O.Yu. Denisov, Bruno Minetti, C. Guaraldo, A. Panzarasa, L. Busso, Piergiorgio Cerello, M. Capponi, Tullio Bressani, D. Calvo, N. Semprini Cesari, and Antonio Zoccoli

Subjects
Nuclear physics, Physics, Nuclear reaction, Nuclear and High Energy Physics, Annihilation, Protonium, Branching fraction, Excited state, Hadron, Atomic physics, Exotic atom
Abstract

The annihilation frequencies of 19 p p annihilation reactions at rest obtained in different target densities are analysed in order to determine the values of the P -wave annihilation percentage at each target density and the average hadronic branching ratios from P - and S -states. Both the assumptions of linear dependence of the annihilation frequencies on the P -wave annihilation percentage of the protonium state and the approach with the enhancement factors of Batty are considered. Furthermore the cases of incompatible measurements are discussed.

Published
2001

18. Antiproton–neon annihilation at 57 MeV/c

Author

A. Grasso, M.P. Bussa, Andrea Ferrero, Germano Bonomi, L. Ferrero, C. Guaraldo, E. Lodi Rizzini, L. Venturelli, F. Tosello, M. Maggiora, Andrea Bianconi, Aldo Zenoni, M.L. Colantoni, G. Piragino, A. Maggiora, G.B. Pontecorvo, F. Balestra, and L. Busso

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Neon, Momentum (technical analysis), Cross section (physics), Annihilation, chemistry, Physics::Instrumentation and Detectors, Antiproton, chemistry.chemical_element, Atomic physics
Abstract

The p Ne annihilation cross section is measured for the first time in the momentum interval (53÷63) MeV/c. About 9000 pictures collected by the Streamer Chamber Collaboration (PS179) at LEAR-CERN have been scanned. Four events are found, corresponding to σ ann =2210±1105 mb. The result is compared to the set of measurements presently available in the region of low p momentum.

Published
2000

19. Antiproton–helium 3 annihilation at 55 MeV/c

Author

F. Tosello, M.P. Bussa, Germano Bonomi, L. Busso, L. Ferrero, F. Balestra, A. Maggiora, Andrea Ferrero, A. Grasso, G. Piragino, E. Lodi Rizzini, G.B. Pontecorvo, L. Venturelli, M.L. Colantoni, Aldo Zenoni, Andrea Bianconi, C. Guaraldo, and M. Maggiora

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Momentum (technical analysis), Cross section (physics), Annihilation, Antiproton, Helium-3, Atomic physics
Abstract

The p 3He annihilation cross section is measured for the first time in the momentum interval (50÷60) MeV/c. About 9000 pictures collected by the Streamer Chamber Collaboration (PS179) at LEAR–CERN have been scanned. Six events are found, corresponding to σann=1850±700 mb. The result is compared to the set of measurements presently available in the region of low p momentum.

Published
2000

20. Study of η and η′ production in annihilations

Author

Alberto Masoni, D. Calvo, A. Grasso, A.M. Rozhdestvensky, A. Filippi, O.E. Gorchakov, M. Capponi, Tullio Bressani, R. Donà, Germano Bonomi, Maurizio Piccinini, R. Spighi, S. Mauro, S. De Castro, Piergiorgio Cerello, C. Guaraldo, M. Poli, Michelangelo Agnello, S. Serci, Stefania Vecchi, Paolo Montagna, D. Panzieri, Bruno Minetti, Mauro Villa, M.G. Sapozhnikov, V. Filippini, Paola Salvini, E. Lodi Rizzini, V. Vagnoni, V.I. Tretyak, A. Maggiora, S.N. Prakhov, V. Lucherini, Aldo Zenoni, V.G. Ableev, G. Puddu, G. Bendiscioli, N. Semprini Cesari, F. Balestra, L. Venturelli, Maria Pia Bussa, L. Busso, U. Marconi, R. Garfagnini, B. Giacobbe, Antonio Zoccoli, S. Costa, Elena Botta, Marco Bruschi, A. Feliciello, A. Panzarasa, O. Y. Denisov, L. Vannucci, Andrea Bianconi, G. L. Usai, I. Massa, S. Marcello, F. D'Isep, Armando Lanaro, A. Vitale, G. Vedovato, Paola Gianotti, A. Bertin, D. Galli, Adriano Fontana, N. Mirfakhraee, F. Tosello, S. Tessaro, Felice Iazzi, Corrado Cicalo, Alberto Rotondi, and C. Petrascu

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, P wave, Pseudoscalar meson, Nuclear physics, Pseudoscalar, Production (computer science), Mixing (physics), Line (formation)
Abstract

The annihilation fractions and cross sections for the n p annihilation reaction in flight (∼50–400 MeV/c) into ηπ+ and η′π+ final states have been measured. The first ones follow the trend expected for P wave annihilations. From the ratios of the yields an evaluation of the pseudoscalar mixing angle in the standard form is possible. The value found shows that for pseudoscalar meson production from P wave the Quark Line Rule is not grossly violated.

Published
1999

21. and annihilation cross sections at very low energy

Author

N. Semprini Cesari, D. Galli, Andrea Bianconi, G. L. Usai, M.P. Bussa, Piergiorgio Cerello, S. Costa, G. Bendiscioli, Paola Salvini, Stefania Vecchi, R. A. Ricci, S.N. Prakhov, Adriano Fontana, I. Massa, N. Mirfakhrai, S. Marcello, L. Ferrero, L. Venturelli, C. Guaraldo, Maurizio Piccinini, R. Garfagnini, R. Spighi, F. D'Isep, Alberto Rotondi, Armando Lanaro, U. Marconi, M. Corradini, M. Capponi, A. Panzarasa, C. Petrascu, F. Tosello, S. Tessaro, G. Puddu, Tullio Bressani, A. Grasso, S. De Castro, A. Vitale, Elena Botta, U. Gastaldi, Antonio Zoccoli, S. Mauro, V.I. Tretyak, Alberto Masoni, S. Serci, M. Poli, Antonietta Donzella, A. Feliciello, V. Lucherini, D. Calvo, B. Giacobbe, Mauro Villa, V. Vagnoni, Paola Gianotti, Felice Iazzi, Corrado Cicalo, O.E. Gorchakov, Germano Bonomi, D. Panzieri, Michelangelo Agnello, A.M. Rozhdestvensky, A. Filippi, R. Donà, E. Lodi Rizzini, Aldo Zenoni, A. Bertin, Bruno Minetti, Marco Bruschi, F. Balestra, L. Vannucci, O. Y. Denisov, Paolo Montagna, and L. Busso

Subjects
Nuclear physics, Momentum, Physics, Nuclear and High Energy Physics, Cross section (physics), Low energy, Annihilation, Deuterium, Nuclear Experiment
Abstract

The p D and p 4 He total annihilation cross sections have been measured with the Obelix apparatus at LEAR at, respectively, three and two values of the p incident momentum between 70 MeV/c and 36 MeV/c. The values of the p D annihilation cross section, at such low energies, are in agreement with a surprising result obtained in a recent low statistics measurement of the antiprotonic deuterium K α X-rays [M. Augsburger et al., Phys. Lett. B 461 (1999) 417] (see following article), concerning the unexpected narrow width of the antiprotonic deuterium 1s level.

Published
1999

22. Evidence for two pseudoscalar states in the 1.4–1.5 GeV mass region

Author

R. Spighi, A. Masoni, Germano Bonomi, L. Venturelli, V.I. Tretyak, V. Lucherini, D. Galli, A. Filippi, Bruno Minetti, A. Feliciello, Petar Temnikov, Antonio Zoccoli, D. D'Isep, M. Capponi, Tullio Bressani, R. Garfagnini, A. Grasso, S. Costa, A. Maggiora, M. Lombardi, L. Ferrero, O.E. Gorchakov, Elena Botta, A. De Falco, F. Tosello, S. Tessaro, Michelangelo Agnello, I. Massa, Mauro Villa, S.N. Prakhov, A. Panzarasa, S. Marcello, R. Donà, Sergio Serci, Alberto Rotondi, V. Filippini, F. Balestra, G. Vedovato, B. Giacobbe, U. Marconi, Vincenzo Vagnoni, C. Petrascu, Felice Iazzi, M. Bruschi, V.G. Ableev, D. Panzieri, Piergiorgio Cerello, A. Vitale, Aldo Zenoni, Stefania Vecchi, Adriano Fontana, M. Poli, Corrado Cicalo, G. Puddu, M. Piccinini, D. Calvo, C. Guaraldo, P. Montagna, N. Semprini Cesari, Paola Gianotti, Andrea Bianconi, G. L. Usai, S. Mauro, E. Lodi Rizzini, Paola Salvini, A.M. Rozhdestvensky, N. Mirfakhrai, Armando Lanaro, S. De Castro, O. Y. Denisov, L. Busso, and A. Bertin

Subjects
Pseudoscalar, Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics
Abstract

A confirming evidence for two pseudoscalar states with masses M 1 =1405±5, Γ 1 =50±4 MeV/ c 2 and M 2 =1500±10, Γ 2 =100±20 MeV/ c 2 is reported. The second pseudoscalar fills the nonet and leaves the first as an outsider supporting the hypothesis for its exotic nature.

Published
1999

23. Light baryon production in binary annihilation reactions at rest

Author

L. Fava, M. Capponi, Tullio Bressani, S. De Castro, U. Gastaldi, A.M. Rozhdestvensky, V. Filippini, N. Mirfakhraee, D. Galli, G. Puddu, F. Tosello, M.G. Sapozhnikov, S. Tessaro, N. Semprini Cesari, Paolo Montagna, C. Cavion, L. Santi, F. Nichitiu, Aldo Zenoni, E. Lodi Rizzini, P. Cerello, A. Panzarasa, Petar Temnikov, R. Spighi, A. Bertin, V.G. Ableev, A. Masoni, Armando Lanaro, O. Gortchakov, S. Costa, D. Calvo, G. Pauli, Antonio Zoccoli, A. Grasso, F. Vigotti, M.P. Bussa, Vincenzo Vagnoni, G. Vedovato, Stefania Vecchi, G. Maron, Elena Botta, U. Marconi, A. Filippi, Paola Gianotti, Bruno Minetti, R. Donà, V. Alberico, M. Corradini, Sergio Serci, Michelangelo Agnello, Felice Iazzi, Corrado Cicalo, S. Mauro, M. Lombardi, S.N. Prakhov, G. Piragino, A. Vitale, Andrea Bianconi, G. L. Usai, Gianfranco Zosi, M. Poli, D. Panzieri, D. D'Isep, I. D'Antone, Mauro Villa, O. Y. Denisov, Adriano Fontana, Maurizio Piccinini, A. Ferretti, R. Garfagnini, B. Giacobbe, L. Busso, S. Marcello, Paola Salvini, V.I. Tretyak, A. Maggiora, V. Lucherini, Marco Bruschi, L. Venturelli, F. Balestra, L. Ferrero, Alberto Rotondi, C. Petrascu, L. Vannucci, C. Guaraldo, Alessandro Feliciello, and G. Bendiscioli

Subjects
Baryon, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Deuterium, Antiproton, Binary number
Abstract

We report the study of light baryon production in two-prong annihilation reactions due to antiprotons stopping in gaseous deuterium and detected by the OBELIX spectrometer (LEAR, CERN). A clear signal of the Δ(1232) production in binary reactions was found in both annihilation channels: p d→π − Δ + (Δ + →π 0 p) and p d→π 0 Δ 0 (Δ 0 →π − p) . The annihilation probabilities for these reactions turned out to be Y=(1.01±0.08)×10−5 and Y=(1.12±0.20)×10−5, respectively. In addition, the annihilation probability for the prototype Pontecorvo reaction p d→π − p was measured with the best world statistics: Y=(1.46±0.08)×10−5.

Published
1999

24. Study of and annihilation reactions in flight

Author

D. Panzieri, E. Lodi Rizzini, Alberto Masoni, G. Vedovato, D. Calvo, N. Semprini Cesari, Paolo Montagna, Paola Gianotti, V. Filippini, L. Santi, G. Bendiscioli, Antonietta Donzella, C. Cavion, Aldo Zenoni, A.M. Rozhdestvensky, Michelangelo Agnello, B. Giacobbe, C. Guaraldo, O. Y. Denisov, C. Fanara, S. Costa, S.N. Prakhov, R. Spighi, M. Lombardi, V. Vagnoni, A. Grasso, L. Valacca, O.E. Gorchakov, A. Raimondo, L. Venturelli, M.G. Sapozhnikov, M. Corradini, V. Alberico, F. Nichitiu, M. Capponi, L. Busso, G. Pauli, A. Panzarasa, Tullio Bressani, U. Gastaldi, V.G. Ableev, F. Balestra, S. De Castro, M.P. Bussa, Stefania Vecchi, Piergiorgio Cerello, M. Poli, Armando Lanaro, A. Feliciello, S. Serci, U. Marconi, V.I. Tretyak, G. Maron, A. Maggiora, Paola Salvini, A. Vitale, V. Lucherini, S. Mauro, D. Bergo, Bruno Minetti, F. Vigotti, L. Vannucci, Antonio Zoccoli, Mauro Villa, Elena Botta, S. Marcello, Marco Bruschi, R. Garfagnini, G. L. Usai, L. Ferrero, Alberto Rotondi, C. Petrascu, D. Galli, Maurizio Piccinini, Gianfranco Zosi, Adriano Fontana, A. Ferretti, N. Mirfakhraee, F. Tosello, S. Tessaro, C. Scoglio, Felice Iazzi, Corrado Cicalo, A. Filippi, R. Donà, Petar Temnikov, A. Bertin, and G. Puddu

Subjects
Physics, Nuclear physics, Nuclear reaction, Nuclear and High Energy Physics, Annihilation, Pion, Meson, OZI rule, Nuclear Theory, Nuclear Experiment, Nucleon, Antineutron, Quarkonium
Abstract

The results of a study of the annihilation reactions n p → θπ + and n p → ωπ + are reported; the data were collected by the OBELIX apparatus, with antineutrons annihilating in flight (momenta from ∼ 50 MeV/ c to 405 MeV/ c ). Annihilation frequencies and annihilation cross sections have been deduced, for both channels, as a function of antineutron momentum. From the cross section ratio, a substantial deviation from OZI rule expectations is observed. An s s quark content in the nucleon offers a fairly plausible explanation for such an effect.

Published
1999

25. Study of φ and f′2(1525) meson production in annihilation at rest

Author

M. Capponi, Tullio Bressani, U. Gastaldi, A. Feliciello, S. Mauro, Paola Salvini, Armando Lanaro, V. Vagnoni, L. Valacca, D. D'Isep, L. Fava, G. Puddu, M. Poli, L. Venturelli, G. Vedovato, Paola Gianotti, U. Marconi, A. Filippi, A.M. Rozhdestvensky, C. Scoglio, S. De Castro, R. Donà, D. Galli, S. Costa, A. Vitale, Alberto Masoni, S.N. Prakhov, L. Ferrero, R. Spighi, S. Serci, D. Calvo, M. Corradini, F. Nichitiu, Alberto Rotondi, C. Petrascu, V.P. Nomokonov, B. Giacobbe, O.E. Gorchakov, N. Semprini Cesari, A M Rosca, D. Panzieri, N. Mirfakhrai, G. Pauli, A. Panzarasa, S. Marcello, L. Santi, V. Filippini, Maurizio Piccinini, Marco Bruschi, Antonio Zoccoli, Elena Botta, Piergiorgio Cerello, C. Cavion, V.I. Tretyak, Michelangelo Agnello, M.P. Bussa, A. Maggiora, V. Lucherini, Aldo Zenoni, L. Busso, Stefania Vecchi, L. Vannucci, Petar Temnikov, Mauro Villa, A. Bertin, F. Tosello, S. Tessaro, A Alberico, E. Lodi Rizzini, R. Bianconi, R. Garfagnini, A. Grasso, Felice Iazzi, Corrado Cicalo, F. Vigotti, G. L. Usai, F. Balestra, Adriano Fontana, A. Ferretti, Paolo Montagna, C. Guaraldo, Bruno Minetti, G. Bendiscioli, O.Yu. Denisov, M. Lombardi, M.G. Sapozhnikov, V.G. Ableev, and G. Maron

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, OZI rule, Branching fraction, Antiproton, Yield (chemistry), Mass spectrum, Dalitz plot, Quantum number
Abstract

The reaction p p→K + K − π 0 was analysed for antiproton annihilations at rest at three hydrogen target densities. A strong dependence of the p p→φπ 0 yield on the quantum numbers of the initial state is observed. The branching ratio of the φπ0 channel from the 3S1 initial state is more than 15 times larger than the one from the 1P1 state. A large apparent violation of the OZI rule for tensor meson production from p p -annihilations from the P-waves (1+++2++) is observed: Rexp(f′2π0/f2π0)=(149±20)·10−3, significantly exceeding the OZI-rule prediction R=16·10−3.

Published
1998

26. Study of the isovector scalar mesons in the channel p̄p→K±K0Sπ∓ at rest with initial angular momentum state selection

Author

V. Filippini, N. Semprini Cesari, L. Santi, Antonietta Donzella, C. Scoglio, C. Cavion, Aldo Zenoni, A. Masoni, Felice Iazzi, Gianfranco Zosi, Tullio Bressani, U. Gastaldi, S. Mauro, Armando Lanaro, G. Bendiscioli, Adriano Fontana, Piergiorgio Cerello, G. Pauli, F. Vigotti, M. Poli, Corrado Cicalo, M. Capponi, A. Saino, S. Costa, Elena Botta, O. Y. Denisov, G. Vedovato, D. Calvo, Petar Temnikov, R. A. Ricci, Paola Gianotti, M. Corradini, Michelangelo Agnello, A. Bertin, S.N. Prakhov, F. Tosello, S. Tessaro, Paolo Montagna, A. Grasso, A. Feliciello, C. Guaraldo, Antonio Ferretti, L. Ferrero, A.M. Rozhdestvensky, F. Balestra, Benedetto Giacobbe, Roberto Spighi, G. Puddu, Paola Salvini, Massimo Piccinini, A. Benedettini, M. Lombardi, G. L. Usai, R. Garfagnini, Umberto Marini Bettolo Marconi, E. Lodi Rizzini, Alberto Rotondi, C. Petrascu, G. Maron, D. D'Isep, D. Galli, S. Marcello, V.I. Tretyak, R. Donà, Bruno Minetti, S. De Castro, A. Filippi, L. Busso, E. Rossetto, M.G. Sapozhnikov, M.P. Bussa, Stefania Vecchi, V. Lucherini, V.G. Ableev, D. Panzieri, Mauro Villa, L. Valacca, L. Venturelli, Sergio Serci, A. Vitale, A. Maggiora, O.E. Gorchakov, Marco Bruschi, A M Rosca, V. Vagnoni, F. Nichitiu, and Antonio Zoccoli

Subjects
Hydrogen density, Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Angular momentum, Isovector, Meson, Scalar (physics)
Abstract

The study of the I =1, J PC =0 ++ states with the OBELIX detector in the channel p p→K ± K 0 S π ∓ at three different target densities is reported. The data show the evidence for an extra scalar state with mass 1.29±0.01 GeV/ c 2 and width 0.080±0.005 GeV/ c 2 .

Published
1998

27. Study of the annihilation from S states

Author

D. Galli, G. L. Usai, Paolo Montagna, Alberto Masoni, O.E. Gorchakov, I. Massa, A M Rosca, Michelangelo Agnello, Armando Lanaro, S. Marcello, M.P. Bussa, Stefania Vecchi, C. Scoglio, F. Tosello, A. Saino, S. Tessaro, V. Filippini, S. De Castro, M. Corradini, U. Marconi, Antonietta Donzella, A.M. Rozhdestvensky, C. Cavion, Aldo Zenoni, A. Feliciello, L. Perrero, A. Vitale, D. D'Isep, B. Giacobbe, Marco Bruschi, Bruno Minetti, Alberto Rotondi, L. Vannucci, S. Serci, F. Nichitiu, A. Bertin, C. Petrascu, M. Lombardi, S. Costa, M. Poli, Elena Botta, Maurizio Piccinini, G. Vedovato, G. Pauli, M.G. Sapozhnikov, V.I. Tretyak, P.P. Temnikov, Gianfranco Zosi, Paola Gianotti, A. Maggiora, V. Lucherini, V.G. Ableev, Adriano Fontana, L. Busso, A. Ferretti, A. Collamati, Mauro Villa, L. Valacca, S.N. Prakhov, L. Venturelli, N. Semprini Cesari, R. Garfagnini, Piergiorgio Cerello, A. Grasso, Felice Iazzi, Paola Salvini, R. Spighi, A. Filippi, L. Santi, G. Maron, Corrado Cicalo, R. Donà, F. Vigotti, M. Capponi, Tullio Bressani, U. Gastaldi, F. Balestra, C. Guaraldo, G. Bendiscioli, O.Yu. Denisov, E. Lodi Rizzini, Antonio Zoccoli, G. Puddu, E. Rossetto, D. Panzieri, and K. Calvo

Subjects
Momentum, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Pion, Annihilation, Meson, State (functional analysis)
Abstract

The results of the spin-parity analysis of annihilations at very low momentum (≈ 50 MeV/c) are reported. To describe the data the production of the ϱ, f2, a2 and a1 mesons and the presence of the ππ interaction in S-wave (the σ term) in the final state are necessary. The best fit solution requires also the presence of a ϱ′ state of mass and width M = 1.282 ± 0.037, Γ = 0.236 ± 0.036 GeV/c2 and of a heavy pion π(1300) of mass and width M = 1.275 ± 0.015, Γ = 0.218 ± 0.100 GeV/c2. The measured fraction of the annihilation cross section into 2π+2π− is (7.61 ± 0.35) · 10−2.

Published
1997

28. Spin-parity analysis of the final state π+π−π0 from annihilation at rest in hydrogen targets at three densities

Author

Nicola Semprini-Cesari, Alberto Masoni, Paola Salvini, S. Costa, D. Calvo, V. Vagnoni, M. Poli, G. Vedovato, A. Saino, C. Scoglio, Roberto Spighi, A. Grasso, Mauro Villa, Umberto Marini Bettolo Marconi, Paola Gianotti, M.P. Bussa, A. Vitale, A. Collamati, L. Filippi, Stefania Vecchi, O. Y. Denisov, C. Damiani, L. Ferrero, L. Fava, Michelangelo Agnello, Antonio Ferretti, V. Filippini, I. Massa, O.E. Gorchakov, G. Maron, V.I. Tretyak, C. Cavion, S. De Castro, Aldo Zenoni, A.M. Rozhdestvensky, A M Rosca, D. Galli, A. Maggiora, S. Marcello, M.G. Sapozhnikov, Antonietta Donzella, V. Lucherini, R. Garfagnini, L. Busso, Tullio Bressani, Bruno Minetti, F. Nichitiu, U. Gastaldi, S. Serci, P.P. Temnikov, Alberto Rotondi, L. Valacca, Massimo Piccinini, C. Petrascu, Adriano Fontana, D. Parena, A. Vezzani, L. Venturelli, V.G. Ableev, Paolo Montagna, G. Pauli, F. Vigotti, L. Vannucci, Armando Lanaro, G. Puddu, Elena Botta, E. Rossetto, Marco Bruschi, M. Capponi, R. A. Ricci, G. L. Usai, D. Panzieri, M. Corradini, S.N. Prakhov, F. Tosello, S. Tessaro, P. Cerello, Felice Iazzi, Corrado Cicalo, A. Bertin, A. Filippi, R. Donà, Antonio Zoccoli, F. Balestra, C. Guaraldo, G. Bendiscioli, L. Santi, Alessandro Feliciello, Benedetto Giacobbe, and E. Lodi Rizzini

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Amplitude, Hydrogen, chemistry, Partial wave analysis, Pi, chemistry.chemical_element, Parity (physics), Vector meson, Atomic physics
Abstract

The partial wave analysis of the reaction p p → π + π − π 0 at rest has been performed for the first time by using high-statistics data sets collected in hydrogen targets at three different densities. The different mixtures of partial waves corresponding to our samples allow a reliable determination of each contribution. This technique is crucial in the identification of the exotic candidate f2(1565) which can be produced by 1S0, 3P1 and 3P2 initial states. The amplitude analysis was performed in the frame of the K-Matrix and P-Vector approach. It requires presence of the exotic candidates f0(1500) and f2(1565) with the following masses and total widths: (1449 ± 20)MeV, (114 ± 30)MeV and (1507 ± 15)MeV, (130 ± 20)MeV respectively. In addition to f0(980), f0(1300) f2(1270) and ϱ(770), a clear evidence of I = 1, JP = 1− signal, which we identify with ϱ(1450), is obtained.

Published
1997

29. New data on Δ++-baryon production in annihilation at rest

Author

A. Bertin, M. Bruschi, M. Capponi, A. Collamati, S. De Castro, R. Donà, A. Ferretti, D. Galli, B. Giacobbe, U. Marconi, M. Piccinini, M. Poli, N. Semprini Cesari, R. Spighi, S. Vecchi, A. Vezzani, F. Vigotti, M. Villa, A. Vitale, A. Zoccoli, M. Corradini, A. Donzella, E. Lodi Rizzini, L. Venturelli, A. Zenoni, C. Cicalò, A. Masoni, G. Puddu, S. Serci, P. Temnikov, G. Usai, O. Gortchakov, S. Prakhov, A. Rozhdestvensky, M. Sapozhnikov, V. Tretyak, P. Gianotti, C. Guaraldo, A. Lanaro, V. Lucherini, F. Nichitiu, C. Petrascu, A. Rosca, V. Ableev, C. Cavion, U. Gastaldi, M. Lombardi, G. Maron, L. Vannucci, G. Vedovato, G. Bendiscioli, V. Filippini, A. Fontana, P. Montagna, A. Rotondi, A. Saino, P. Salvini, C. Scoglio, F. Balestra, E. Botta, T. Bressani, M.P. Bussa, L. Busso, D. Calvo, P. Cerello, S. Costa, O. Denisov, L. Fava, A. Feliciello, L. Ferrero, A. Filippi, R. Garfagnini, A. Grasso, A. Maggiora, S. Marcello, D. Panzieri, D. Parena, E. Rossetto, F. Tosello, L. Valacca, G. Zosi, M. Agnello, F. Iazzi, B. Minetti, G. Pauli, S. Tessaro, and L. Santi

Subjects
Physics, Baryon, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Pion, Proton, Deuterium, Analytical chemistry, Invariant mass, Production (computer science)
Abstract

New experimental results on p d annihilation at rest into pions plus a high momentum proton in the final state are discussed. The data sample was collected using the OBELIX spectrometer at the LEAR facility (CERN). The annihilation probabilities, or more precisely the yields (Y) via channels p d → 2π − π + π 0 p and p d → 3π − 2π + π 0 p with proton momenta p > 400 MeV/c have been measured for the first time: Y = (93.2 ± 1.6) × 10−4 and Y = (52.2 ± 1.4) × 10−4, respectively. The signal in the invariant mass distribution of the pπ+ system in the region of the well-known Δ++(1232)-isobar is clearly seen in reactions p d → 2π − π + p , p d → 2π − π + π 0 p , p d → 3π − 2π + p and p d → 3π − 2π + π 0 p . The upper limit on reaction p (Δ − Δ ++ ) → 2π − π + p in the p d annihilation at rest, which could be interpreted as a manifestation of the ΔΔ component of the deuteron, was found to be Y ≤ 6.5 × 10−5 with a 90% confidence level.

Published
1997

30. P̄P partial cross sections at low energy

Author

Maurizio Piccinini, A. Zenoni, Bruno Minetti, R. Spighi, D. Panzieri, I. Massa, S.N. Prakhov, L. Venturelli, V. T. Nomokonov, A. Filippi, M.G. Sapozhnikov, L. Santi, F. Nichitiu, E. Lodi Rizzini, M. Morando, G. V. Margagliotti, G. Pauli, L. Fava, D. Parena, B. Giacobbe, A. Vezzani, A. Lanaro, L. Valacca, C. Scoglio, F. Tosello, Alberto Masoni, V.G. Ableev, P. Gianotti, S. De Castro, A. Saino, M. Capponi, S. Marcello, I. D'Antone, T. Bressani, U. Gastaldi, S. Serci, Paola Salvini, F. Balestra, S. Tessaro, G. Vedovato, E. Rossetto, C. Guaraldo, A. Benedettini, Paolo Montagna, G. Maron, Stefania Vecchi, F. D'Isep, G. Bendiscioli, Alberto Andrighetto, Michelangelo Agnello, N. Mirfakhraee, V.I. Tretyak, A. Collamati, M. Lombardi, L. Busso, N. Semprini Cesari, G. L. Usai, O.Yu. Denisov, Adriano Fontana, E. Botta, D. Calvo, L. Vannucci, A.M. Rozhdestvensky, A. Ferretti, R. Garfagnini, L. Ferrero, Mauro Villa, Felice Iazzi, D. Galli, A. Feliciello, Corrado Cicalo, R. A. Ricci, F. Vigotti, A. Donzella, U. Marconi, M. Poli, V. Filippini, Antonio Zoccoli, M.P. Bussa, A. Vitale, S. Costa, A. Grasso, C. Cavion, G. Puddu, Alberto Rotondi, C. Petrascu, A. Rosca, P. Cerello, Marco Bruschi, V. Lucherini, R. Donà, G. Zosi, M. Corradini, Petar Temnikov, A. Maggiora, and A. Bertin

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Pair production, Annihilation, Meson, Scattering, Protonium, Branching fraction, Hadron, Scattering length, Atomic physics, Atomic and Molecular Physics, and Optics
Abstract

New measurements of the pp total annihilation cross-section at very low momenta (around 50 MeV/c) confirm the previous results obtained by the OBELIX collaboration. The measured values are in general agreement with a scattering length approximation of the annihilation cross-section where the pp scattering lengths are obtained from measurement of the protonium shifts and widths and which accounts for the Coulomb interaction. Partial annihilation cross-sections and annihilation frequencies for some channels have been measured too. The values of the total and partial cross sections at the lowest p momentum show an unexpected behaviour

Published
1997

31. Study of the isovector scalar mesons in the channel p̄pK±KS0π‡ at three hydrogen target densities

Author

Felice Iazzi, Michelangelo Agnello, D. D'Isep, S.N. Prakhov, M. Capponi, A. Vezzani, A. Grasso, S. De Castro, V. Lucherini, Andrea Fontana, Antonio Zoccoli, F. Vigotti, Antonio Ferretti, C. Guaraldo, A. Feliciello, V.I. Tretyak, G. Puddu, M. Morando, S. Serci, A. Filippi, C. Scoglio, S. Tessaro, A. Maggiora, R. Donà, M.P. Bussa, Paolo Montagna, Stefania Vecchi, P. Gianotti, M. Corradini, Paola Salvini, Nicola Semprini-Cesari, A. Benedettini, R. Garfagnini, S. Costa, F. Balestra, F. Nichitiu, E. Lodi Rizzini, G. L. Usai, C. Cicalo, A. Saino, I. Massa, G. Bendiscioli, S. Marcello, Umberto Marini Bettolo Marconi, G. Pauli, Elena Botta, V. Filippini, L. Fava, A M Rosca, Mauro Villa, A. Collamati, G. V. Margagliotti, Tullio Bressani, C. Cavion, Aldo Zenoni, Alberto Masoni, U. Gastaldi, L. Busso, Marco Bruschi, Roberto Spighi, N. Mirfakhraee, D. Calvo, P.P. Temnikov, Gianfranco Zosi, I. D'Antone, L. Valacca, P. Cerello, Antonietta Donzella, L. Venturelli, L. Santi, A. Vitale, A. Bertin, L. Ferrero, O. Y. Denisov, Benedetto Giacobbe, Alberto Rotondi, C. Petrascu, V.P. Nomokonov, D. Parena, D. Panzieri, F. Tosello, E. Rossetto, M.G. Sapozhnikov, V.G. Ableev, M. Lombardi, D. Galli, A.M. Rozhdestvensky, Massimo Piccinini, Armando Lanaro, M. Poli, G. Vedovato, L. Vannucci, G. Maron, and Bruno Minetti

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Particle decay, Annihilation, Pair production, Meson, Isovector, Branching fraction, Hadron, Invariant mass, Atomic physics, Atomic and Molecular Physics, and Optics
Abstract

The study of the I = 1, 0 ++ states with the OBELIX detector in the channel pp → K ±K 0 sπ ∓ at three different target densities is reported. We discuss in particular the results about a o (980) and the evidence of an extra scalar state with mass 1.29 ± 0.01 GeV/c 2 and width 0.080 ± 0.005 GeV/c 2

Published
1997

32. Results on spin-parity analysis of n̄p → π+π−π+ in flight

Author

E. Rossetto, Tullio Bressani, U. Gastaldi, M. Capponi, N. Semprini Cesari, L. Santi, D. Panzieri, S. Costa, P. Cerello, A. Bertin, Antonio Ferretti, A. Feliciello, Alberto Masoni, I. Massa, D. Calvo, Bruno Minetti, Michelangelo Agnello, L. Ferrero, S. Marcello, A. Filippi, S.N. Prakhov, Antonio Zoccoli, M. Lombardi, R. Donà, M. Morando, P.P. Temnikov, Gianfranco Zosi, A. Vezzani, L. Valacca, L. Fava, D. Galli, S. De Castro, M.G. Sapozhnikov, V. Lucherini, Alberto Rotondi, F. D'Isep, G. Belli, C. Scoglio, C. Petrascu, D. Parena, A. Saino, Umberto Marini Bettolo Marconi, A M Rosca, Mauro Villa, G. V. Margagliotti, S. Serci, F. Tosello, V.G. Ableev, N. Mirfakhraee, M. Corradini, S. Tessaro, L. Venturelli, G. Maron, M. Poli, V. Filippini, G. Vedovato, Roberto Spighi, P. Gianotti, F. Nichitiu, C. Cavion, Elena Botta, L. Vannucci, Aldo Zenoni, E. Lodi Rizzini, G. L. Usai, C. Guaraldo, M.P. Bussa, Andrea Fontana, Stefania Vecchi, R. A. Ricci, G. Pauli, Felice Iazzi, G. Bendiscioli, Alberto Andrighetto, V.I. Tretyak, A. Maggiora, A. Collamati, A. Vitale, A.M. Rozhdestvensky, F. Balestra, C. Cicalo, Massimo Piccinini, F. Vigotti, Marco Bruschi, G. Puddu, R. Garfagnini, Antonietta Donzella, Armando Lanaro, Benedetto Giacobbe, Paola Salvini, I. D'Antone, A. Benedettini, O. Gortchakov, A. Grasso, O. Y. Denisov, L. Busso, and Paolo Montagna

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Annihilation, Pion, Pair production, Meson, Hadron, Elementary particle, Invariant mass, Atomic physics, Atomic and Molecular Physics, and Optics
Abstract

We report in this paper the results of the study of the ƒ 0 (1500)/ƒ 2 (1565) resonances in the in-flight annihilation reaction np → 2 π + π − , taking into account a possible dependence on the n momentum.

Published
1997

33. A search for axial vectors in annihilations at rest in gaseous hydrogen at NTP

Author

L. Fava, R. Spighi, S.N. Prakhov, S. De Castro, D. Galli, A. Filippi, R. Donà, R. Garfagnini, F. Tosello, G. L. Usai, Marco Bruschi, S. Tessaro, S. Serci, A. Lai, Nicola Semprini-Cesari, Elena Botta, Michelangelo Agnello, Piergiorgio Cerello, V.I. Tretyak, A. Saino, L. Musa, S. Costa, A. Maggiora, Maurizio Piccinini, V. Lucherini, O.E. Gorchakov, A. Vezzani, A M Rosca, L. Valacca, F. Balestra, O. Y. Denisov, L. Venturelli, S. Marcello, M. Capponi, Petar Temnikov, Tullio Bressani, A. Grasso, A. Bertin, U. Gastaldi, C. Scoglio, Antonio Zoccoli, G. Bendiscioli, V. Filippini, F. Vigotti, Alberto Masoni, U. Marconi, D. Calvo, Mauro Villa, Paola Salvini, A. Vitale, L. Busso, C. Cavion, L. Santi, Adriano Fontana, Aldo Zenoni, C. Guaraldo, A. Ferretti, A. Collamati, Felice Iazzi, L. Vannucci, Corrado Cicalo, Paolo Montagna, M.P. Bussa, Stefania Vecchi, Antonietta Donzella, B. Giacobbe, M. Corradini, F. Nichitiu, G. Pauli, A. Feliciello, L. Ferrero, Alberto Rotondi, C. Petrascu, D. Parena, E. Lodi Rizzini, M.G. Sapozhnikov, V.G. Ableev, M. Lombardi, A.M. Rozhdestvensky, D. Panzieri, G. Puddu, E. Rossetto, Armando Lanaro, M. Poli, G. Vedovato, Paola Gianotti, Bruno Minetti, and G. Maron

Subjects
Pseudoscalar, Physics, Nuclear physics, Nuclear and High Energy Physics, Annihilation, Gaseous hydrogen, Pi
Abstract

The study of the K±Kmiss0π∓π+π− channel (7016 events), from p p annihilations in a gaseous hydrogen target at NTP, with the OBELIX spectrometer at LEAR (CERN), is presented. A spin-parity analysis provides evidence for two axial vectors, one in the low K K π mass region, the well established f1(1285), decaying to a0(980)π, the second, the 1++ component of the old puzzling E l , the f1(1420), decaying mainly to K ∗ K , seen for the first time in p p annihilation at rest. The analysis confirms the dominant production of the pseudoscalar η(1405), decaying mainly to (Kπ) S K , and the existence of a second pseudoscalar in the same mass region, the η(1460), decaying mainly to K ∗ K .

Published
1997

34. decay to in annihilation at rest

Author

A. Lai, S. De Castro, Armando Lanaro, Tullio Bressani, U. Gastaldi, Mauro Villa, Paola Salvini, Nicola Semprini-Cesari, L. Musa, S. Costa, G. Puddu, B. Cereda, O.Yu. Denisov, S. Serci, S. Marcello, L. Santi, M. Morando, A.M. Rozhdestvensky, N. Mirfakhrai, A. Filippi, Michelangelo Agnello, Paolo Montagna, M.P. Bussa, D. Galli, G. Maron, Massimo Piccinini, M.G. Sapozhnikov, L. Ferrero, Stefania Vecchi, Elena Botta, E. Rossetto, Alberto Rotondi, L. Venturelli, Alberto Masoni, C. Petrascu, D. Parena, A. Feliciello, D. Calvo, G. Bendiscioli, Gianfranco Zosi, A. Grasso, Petar Temnikov, D. Panzieri, V.G. Ableev, Felice Iazzi, Antonietta Donzella, M. Poli, Corrado Cicalo, L. Busso, A. Bertin, A. Vezzani, G. L. Usai, Adriano Fontana, Bruno Minetti, Paola Gianotti, R. Garfagnini, V.I. Tretyak, Benedetto Giacobbe, C. Guaraldo, F. Tosello, S. Tessaro, A. Maggiora, E. Lodi Rizzini, F. Vigotti, V. Lucherini, F. Balestra, Antonio Ferretti, Marco Bruschi, Roberto Spighi, A. Saino, A. Vitale, A M Rosca, Antonio Zoccoli, V. Filippini, C. Cavion, Aldo Zenoni, Umberto Marini Bettolo Marconi, M. Corradini, F. Nichitiu, G. Pauli, and Piergiorgio Cerello

Subjects
Nuclear physics, Pseudoscalar, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Large Hadron Collider, Spectrometer, Partial wave analysis, Dalitz plot, Resonance, Bar (unit)
Abstract

The results of the analysis of 3940 (K K π)ππ events from a sample of 18 millions p p annihilations in the liquid hydrogen target of the OBELIX spectrometer at LEAR (CERN) are presented. The presence of two pseudoscalar states at 1.416±0.002GeV/c2, with width 0.050±0.004GeV/c2, and at 1.46±0.01GeV/c2, with width 0.105±0.015GeV/c2, is established. The lighter mass resonance decays mainly to K K π , possibly with final state interactions and a small contribution coming from a0π. The higher mass 0−+ state, which is seen for the first time in p p annihilation at rest, decays only to K ∗ K . Masses, widths and decay modes are in agreement with the analysis of J Ψ radiative decay performed by the Mark III Collaboration. From the fit the G-parity was determined to be +1. The dominant three-body decay mode of the lighter pseudoscalar is observed for the first time in this measurement.

Published
1995

35. Measurements of the annihilation at rest

Author

S. Costa, R. Spighi, A. Masoni, Elena Botta, Felice Iazzi, S. Marcello, S. De Castro, A. Filippi, Paola Salvini, F. Balestra, Corrado Cicalo, R. A. Ricci, Maurizio Piccinini, G. Puddu, Sergio Serci, Michelangelo Agnello, M. Capponi, M. Poli, Tullio Bressani, M. Lombardi, Piergiorgio Cerello, U. Gastaldi, G. Vedovato, V. Lucherini, M.G. Sapozhnikov, A. Saino, D. Calvo, A. Maggiora, V.I. Tretyak, G. Maneva, Paolo Montagna, C. Guaraldo, O.E. Gorchakov, B. Cereda, R. Garfagnini, P. Boccaccio, M.P. Bussa, Paola Gianotti, F. Nichitiu, V.G. Ableev, F. Tosello, S. Tessaro, M. Morando, Stefania Vecchi, Gianfranco Zosi, E. Rossetto, G. L. Usai, L. Vannucci, Adriano Fontana, G. Pauli, L. Ferrero, A. Feliciello, Armando Lanaro, S.N. Prakhov, L. Busso, L. Santi, A. Vitale, D. Galli, Petar Temnikov, Mauro Villa, G. V. Margagliotti, Antonietta Donzella, D. D'Isep, Bruno Minetti, Alberto Rotondi, E. Lodi Rizzini, B. Giacobbe, A. Bertin, Nicola Semprini-Cesari, O.Yu. Denisov, D. Panzieri, V. Filippini, A.M. Roshdestvensky, A. Grasso, Aldo Zenoni, G. Bendiscioli, Marco Bruschi, L. Fava, U. Marconi, G. Maron, L. Venturelli, and Antonio Zoccoli

Subjects
Physics, Nuclear and High Energy Physics, Annihilation, Nuclear magnetic resonance, Analytical chemistry
Abstract

The measurement of different reactions of p d annihilation at rest in a gaseous target has been performed using the OBELIX spectrometer at LEAR (CERN). A strong deviation from the OZI-rule prediction was found from the measurement of the ratio R = φπ ωπ in two regions of proton momenta, P c and P > 400 MeV/ c : R( φπ − ωπ − ) = (133 ± 26) × 10 −3 and (113 ± 30) × 10 −3 , respectively. These values are about 30 times greater than the theoretical prediction. For the first time the excitation of the †-resonance was observed among the final-state products of p d annihilation. The existence of a broad enhancement in the 4π invariant mass at m ≈ 1480 MeV, seen in previous experiments, was confirmed. A ≈ 100 MeV downward shift of the bump position, when the proton momentum increased up to P > 400 MeV/ c , was also observed, while the positions of ω, ϱ and f 2 (1270) did not change with the proton momentum. The following branching ratios were measured: BR( p d → π − φ p ) = (6.62 ± 0.49) × 10 −4 , for P c ; BR( p d → π − φ p ) = (0.95 ± 0.22) × 10 −4 , for P > 400 MeV/ c ; BR( p d → π − ω p ) = (49.7 ± 8.9) × 10 −4 , for P c ; BR( p d → π − ω p ) = (8.38 ± 1.09) × 10 −4 , for P > 400 MeV/ c ; BR( p d → 2π − π + p ) = (150 ± 6) × 10 −4 , for P c ; BR( p d → 2π − π + p ) = (16.6 ± 0.9) × 10 −4 , for P > 400 MeV/ c ; BR( p d → 3π − 2π + p ) = (326 ± 12) × 10 −4 , for P c ; BR( p d → 3π − 2π + p ) = (44 ± 7) × 10 −4 , for P > 400 MeV/ c ; BR( p d → Λ K + π − ) = (0.96 ± 0.19) × 10 −4 , for P > 400 MeV/ c ; BR( p d → Λ K + π − π 0 ) = (3.5 ± 0.8) × 10 −4 , for P > 400 MeV/ c ; BR( p p → 2π − 2π + ) = (540 ± 20) × 10 −4 ; BR( p p → 3π − 3π + ) = (251 ± 21) × 10 −4 .

Published
1995

36. FINUDA and hypernuclei production at DAωNE

Author

N. Colonna, L. Fiore, Rinaldo Rui, S. Marcello, M. Bertani, A. Donzella, Felice Iazzi, D. R. Gill, A. Sharma, Paola Salvini, A. Olin, L. Venturelli, E. Rossetto, D. Calvo, Bruno Minetti, S. Sarwar, C. Guaraldo, S. Yen, S. Bianco, S. Costa, Paolo Montagna, G. D’Erasmo, N. Grion, Elena Botta, V. Lucherini, Paolo Camerini, Michelangelo Agnello, Armando Lanaro, G. R. Smith, P. Gianotti, V. Paticchio, A. Feliciello, L. Busso, Tullio Bressani, A. Filippi, E.M. Fiore, M. Corradini, V. Filippini, Aldo Zenoni, E. Lodi-Rizzini, C. Cattaneo, Alberto Rotondi, F.L. Fabbri, and A. Pantaleo

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Positron, Luminosity (scattering theory), law, Electron, Collider, Linear particle accelerator, law.invention
Abstract

The DAωNE project at the Laboratori Nazionali di Frascati (LNF) is an e + e − collider with electron and positron beams accelerated to 510 MeV by a Linac injector. DAωNE is designed to reach a top luminosity L ∼ 10 33 cm −2 s −1 , that is, to produce ∼4×10 3 ω (1020) s −1 . The hypernuclear research program at DAωNE relies on low-energy kaons, ∼ 16MeV, being produced by ω-meson decays at rest: ω → K − K + with a B.R.∼49%. In the initial stage, DAωNE will operate at a L ∼ 10 32 cm −2 s −1 , however the number of ω produced, and the large geometrical acceptance of the FINUDA detector, ∼ 3 sr , will allow a strong hypernuclear physics program to be pursued.

Published
1995

37. Measurement of the frequency of the annihilation reaction p → ππ at rest in a NTP hydrogen target

Author

L. Fava, C. Guaraldo, A.M. Rozhdestvensky, U. Marconi, Armando Lanaro, Bruno Minetti, A. Vitale, S. De Castro, A. Bertin, M. Capponi, Tullio Bressani, M. Poli, G. Vedovato, Paola Gianotti, Piergiorgio Cerello, L. Busso, Maurizio Piccinini, I. D'Antone, U. Gastaldi, S. Serci, Mauro Villa, R. Spighi, A. Saino, Michelangelo Agnello, R. Garfagnini, Antonietta Donzella, V. Filippini, A. Grasso, G. Maron, B. Giacobbe, P.P. Temnikov, Gianfranco Zosi, I. Massa, Alberto Masoni, S. Marcello, Aldo Zenoni, Adriano Fontana, A. Ferretti, D. Calvo, Marco Bruschi, D. Galli, A. Feliciello, F. Nichitiu, G. Pauli, Alberto Andrighetto, Paolo Montagna, A. Maggiora, V. Lucherini, B. Cereda, P. Boccaccio, Paola Salvini, A. Filippi, Elena Botta, M. Lombardi, G. Puddu, L. Venturelli, L. Ferrero, F. Balestra, M. G. Sapozhinikov, Alberto Rotondi, M.P. Bussa, S. Costa, Stefania Vecchi, Felice Iazzi, L. Vannucci, Corrado Cicalo, N. Semprini Cesari, L. Santi, G. L. Usai, F. Tosello, S. Tessaro, E. Lodi Rizzini, E. Rossetto, D. Panzieri, G. Bendiscioli, Antonio Zoccoli, V.I. Tretyak, and M. Morando

Subjects
Rest (physics), Physics, Nuclear physics, Nuclear and High Energy Physics, Angular momentum, Annihilation, Hydrogen, chemistry, Antiproton, chemistry.chemical_element, Atomic physics
Abstract

The annihilation frequency of the reaction p p → π 0 π 0 has been measured, for the first time by stopping antiprotons in a NTP hydrogen target. The obtained result ƒ(π 0 π 0 ) NTP = (12.7±0.5±2.0)×10 −4 is discussed in the frame of the study of the initial angular momentum of the pp system.

Published
1994

38. Measurement of the annihilation frequencies in a 5 mb hydrogen gas target

Author

G. V. Margagliotti, M.P. Bussa, P. Boccaccio, Stefania Vecchi, A. Masoni, G. Bonazzola, A.M. Rozhdestvensky, S. Costa, S. De Castro, G. Pauli, A. Feliciello, Piergiorgio Cerello, R. A. Ricci, M. Capponi, Tullio Bressani, Sergio Serci, Michelangelo Agnello, I. D'Antone, C. Guaraldo, R. Garfagnini, L. Vannucci, U. Gastaldi, G. Piragino, D. Calvo, Antonietta Donzella, Maurizio Piccinini, G. Belli, M. Lombardi, D. Galli, A. Grasso, Petar Temnikov, A. Bertin, F. Tosello, S. Tessaro, F. Balestra, V.I. Tretyak, G. Maneva, L. Ferrero, N. Semprini Cesari, L. Santi, A. Lai, I. Massa, U. Marconi, M.G. Sapozhnikov, Felice Iazzi, A. Vitale, Alberto Andrighetto, Corrado Cicalo, L. Musa, Paola Salvini, A. Maggiora, S. Marcello, V. Lucherini, V.G. Ableev, Bruno Minetti, M. Morando, Mauro Villa, Alberto Rotondi, D. Panzieri, A. Filippi, G. Puddu, M. Poli, F. D'Isep, G. Vedovato, G. Bendiscioli, V. Filippini, E. Lodi Rizzini, L. Fava, R. Spighi, A. Adamo, Gianfranco Zosi, E. Rossetto, A. Zenoni, Marco Bruschi, G. L. Usai, G. Maron, L. Venturelli, M. Corradini, F. Nichitiu, Paola Gianotti, Armando Lanaro, Antonio Zoccoli, Paolo Montagna, and L. Busso

Subjects
Physics, Nuclear and High Energy Physics, Annihilation, Hydrogen, chemistry, Pi, chemistry.chemical_element, Atomic physics
Abstract

We report the first measurement of the K+K−, π+π− frequencies for p annihilations at rest in a gaseous H2 target at low pressure (5 mbar). We have obtained: fππ = (4.26±0.11)×10−3, fKK = (0.46±0.03)×10−3. The ratio R = fKK/fππ has also been measured at a pressure of 2 mbar. Comparison with previous measurements shows that fKK decreases monotonically with the target density but its value at 5 mbar is still higher than the value with L X-ray in coincidence.

Published
1994

39. stopping power in hydrogen below 1 MeV and the 4He metastable state

Author

S. Costa, Antonietta Donzella, G. V. Margagliotti, A. Feliciello, L. Ferrero, M. Poli, G. Vedovato, U. Marconi, Alberto Rotondi, G. Maron, Antonio Zoccoli, M. Capponi, G. Bonazzola, Tullio Bressani, D. Galli, A.M. Rozhdestvensky, Paola Salvini, G. Bendiscioli, U. Gastaldi, Sergio Serci, Michelangelo Agnello, L. Fava, L. Venturelli, M.P. Bussa, V.I. Tretyak, F. Nichitiu, G. Piragino, F. Tosello, A. Vitale, Stefania Vecchi, P. Boccaccio, Mauro Villa, Maurizio Piccinini, V. Filippini, Armando Lanaro, C. Guaraldo, M. Morando, R. Garfagnini, A. Maggiora, E. Zavattini, M. Corradini, L. Busso, S. Tessaro, G. Puddu, A. Masoni, P. Gianotti, P.P. Temnikov, Gianfranco Zosi, V. Lucherini, G. L. Usai, Bruno Minetti, L. Vannucci, F. Balestra, A. Adamo, I. Massa, E. Rossetto, M. Panzieri, M. Lombardi, S. Marcello, Felice Iazzi, C. Rizzo, G. Pauli, Corrado Cicalo, A. Zenom, Marco Bruschi, F. D'Isep, S. De Castro, N. Semprini Cesari, R. A. Ricci, Paolo Montagna, D. Calvo, M.G. Sapozhmkov, G. Belli, E. Lodi Rizzini, L. Santi, A. Grasso, and A. Bertin

Subjects
Physics, Nuclear and High Energy Physics, chemistry, Hydrogen, Gas pressure, Spectrometer, Metastability, Energy interval, Low density, chemistry.chemical_element, Stopping power, Atomic physics, Helium
Abstract

The stopping power of H, for p S was measured in the p energy interval 1 keV + 120 keV using a low density gas target ( p pρ ≈ l0 −3 + 10 −2 ÷ pρ being the Hz density at STP) with the OBELIX spectrometer at the LEAR of CEBN. Furthermore, the formation of metastable states in the p 4 He interaction at rest, having a mean life of the order of 3 μs, was investigated at six target gas pressures (3 atm and 400,250,200,150,50 mbar). The influence of contaminants (like Ha, Ne, Ar, N2 and Xe) on the life of such metastable states was examined at the target gas pressure of 3 atm.

Published
1993

40. Antiproton-4He interactions at 200 MeV/c

Author

S.A. Bunyatov, Paola Salvini, L. Fava, F. Balestra, A. Zenoni, K. Myklebost, M.G. Sapozhnikov, L. Ferrero, J.M. Olsen, V. Filippini, A. Halsteinslid, Alberto Rotondi, M.P. Bussa, A.M. Rozhdestvensky, F. Tosello, T. Jakobsen, Yu.A. Batusov, S. Bossolasco, G. Bendiscioli, C. Guaraldo, A. Maggiora, V.I. Tretyak, G.B. Pontecorvo, E. Lodi-Rizzini, D. Panzieri, I.V. Falomkin, A. Haatuft, F. Nichitiu, G. Piragino, K. M. Danielsen, and L. Busso

Subjects
Nuclear physics, Physics, Elastic scattering, Nuclear and High Energy Physics, Cross section (physics), Amplitude, Annihilation, Antiproton, Imaginary part, Partial wave analysis, Atomic physics, antiproton-He-4 annihilation
Abstract

The differential cross sections for antiproton elastic scattering on 4 He at 192.8 MeV/ c are measured. The annihilation cross section σ a = (377.6 ± 8.0) mb, the elastic cross section σ el = (206.3 ± 6.6) mb and the total p 4 He interaction cross section σ tot = (583.9 ± 10.4) mb are determined. The ratio of the real to imaginary part of the forward p 4 He amplitude is found: π =−0.17± 0.33 0.24 . Partial wave analysis reveals that the S, P and D waves are essential in this energy region.

Published
1993

41. Hypernuclear physics at DAφNE, the frascati φ-factory

Author

P. Gianotti, F. D'Isep, Tullio Bressani, Alessandro Feliciello, S. Costa, Daniela Calvo, C. Guaraldo, Michelangelo Agnello, E. Lodi Rizzini, Felice Iazzi, S. Marcello, G.C. Bonazzola, L. Venturelli, V. Lucherini, A. Lanaro, Bruno Minetti, and E. Rossetto

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Spectrometer, Field (physics), Detector, Factory (object-oriented programming), High resolution
Abstract

The low-energy, background free and tagged K−s from the φ(1020) decay produced at the DAφNE φ-factory in Frascati offer a unique opportunity for high resolution hypernuclei spectroscopy with K−at rest. In this paper we outline the general problematics of this interesting field, expose the physics motivations that support our proposal and, finally, describe the techniques foreseen for precise measurements of the hypernuclear level energies and their decay modes. In this regard we investigated the performances of a magnetic spectrometer foreseen for] one of the interaction region of the DAφNE machine. Details on the detector characteristics as well as on its response to all the particles in the final state will be extensively discussed.

Published
1992

42. Strangeness production in antiproton annihilation at rest on 3He, 4He and 20Ne

Author

M.G. Sapozhnikov, G. Piragino, Paola Salvini, K M Danielsen, L. Ferrero, S. Bossolasco, L. Fava, Alberto Rotondi, F. Balestra, T. Jacobsen, M.P. Bussa, E. Lodi Rizzini, J.M. Olsen, G.B. Pontecorvo, A. Haatuft, L. Busso, A.M. Rozhdestvensky, S.O. Sørensen, I.V. Falomkin, D. Panzieri, A. Halsteinslid, A. Zenoni, A. Venaglioni, C. Guaraldo, F.O. Breivik, V.I. Tretyak, Yu.A. Batusov, A. Maggiora, G. Bendiscioli, F. Tosello, K. Myklebost, and V. Filippini

Subjects
Nuclear physics, Momentum, Nuclear reaction, Mass number, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Antiproton, Strangeness production, Spectral line, Charged particle
Abstract

New data are reported on antiproton annihilations at rest with production of Λ and K s 0 , using a streamer chamber with 3 He, 4 He and 20 Ne as gas targets. The data include Λ, K s 0 , ΛK s 0 and K s 0 K S 0 production rates and momentum distributions, π − momentum spectra, mean numbers of charged particles generally and of negatively charged particles separately for different reaction channels. The yields are compared to simple combinatorial calculations based on the extreme assumptions of Λ production via B = 1 or via B = 0 ( K rescattering) annihilations. Λ and K s 0 momentum spectra are compared to simple model calculations where B = 0 and B = 1 annihilations with and without final-state interactions are considered. A review of existing data on Λ and K s 0 production is presented, showing the dependence on the p momentum and on the mass number of the target.

Published
1991

43. π–4He interactions at T=106 MeV

Author

V. I. Lyashenko, Andrea Ferrero, V. M. Grebenyuk, Yu.A. Batusov, L. Colantoni, G. Piragino, Gianfranco Zosi, V.A. Butenko, A. Kirilov, M. Schepkin, I. A. Belolaptikov, I. Smirnova, M. Chiosso, N.S. Angelov, T. Blokhintseva, A. Bonyushkina, A. Moiseenko, S. Baginyan, A. Maggiora, Andrea Bianconi, I. Gnesi, V.E. Kovalenko, L. Fava, R. Garfagnini, L. Venturelli, V.A. Drozdov, N.A. Russakovich, V.A. Panyushkin, D. Panzieri, V.V. Ivanov, Vladimir Frolov, E. Lodi Rizzini, F. Balestra, V. I. Pryanichnikov, B. Parsamyan, A. Grasso, G.B. Pontecorvo, A.M. Rozhdestvensky, and A. Dem’yanov

Subjects
Physics, Nuclear and High Energy Physics, Scattering, Nuclear Theory, chemistry.chemical_element, Resonance (chemistry), Pion, chemistry, Neutron, Invariant mass, Tritium, Neutrino, Atomic physics, Nuclear Experiment, Helium
Abstract

π – He 4 interactions at T π = 106 MeV have been studied by means of a self-shunted streamer chamber filled with helium at atmospheric pressure. This technique allowed reconstruction of the complete kinematics of the nuclear events under analysis, since tracks of slow p , α , tritium and 3He are readily measurable. The study revealed that the 4He nucleus behaves as a Planck radiator, emitting a T = 14 MeV Planck-like spectrum of high energy γ s, when hit by a π beam of T π = 106 MeV . A resonant behaviour in the π − n invariant mass spectrum has been observed, with M π − n = 1160 MeV and Γ = 20 MeV in the π − 4 He neutron knockout reaction: we consider this to be the first experimental evidence for the existence of the Δ − . The observed mass shift and width narrowing are compatible with the activation of an isobaric collective resonance in the 4He nucleus. The collaboration has also observed a resonant behaviour in the π − pp invariant mass spectrum in the π + ( Ag 105 , Ag 103 ) π − pp double-charge-exchange reaction, on nuclear photoemulsion, compatible with the activation of the J P = 0 − d ′ dibaryonic resonance with a strong p–p final state interaction. A new direct measured upper limit for the ν μ mass has been derived by measuring a complete decay π – μ – e event recorded at the CERN PS179 experiment ( p 20 Ne scattering): at a 90% confidence level, M μ ν ≤ 2.2 MeV .

Published
2008

44. Erratum

Author

Tullio Bressani, U. Gastaldi, M. Capponi, Paolo Montagna, L. Fava, Umberto Marini Bettolo Marconi, S. De Castro, N. Semprini Cesari, V. Alberico, A. Grasso, L. Santi, S. Serci, Antonio Ferretti, Michelangelo Agnello, P. Cerello, Paola Salvini, S.N. Prakhov, S. Costa, G. Bendiscioli, V. Filippini, L. Ferrero, A. Bertin, O. Gortchakov, D. Panzieri, V. Vagnoni, M. Lombardi, S. Mauro, C. Cavion, G. Maron, Benedetto Giacobbe, Aldo Zenoni, A. Filippi, Felice Iazzi, Alberto Masoni, Bruno Minetti, Corrado Cicalo, Mauro Villa, L. Vannucci, D. Galli, M.G. Sapozhnikov, D. Calvo, E. Lodi Rizzini, Alberto Rotondi, Alessandro Feliciello, M. Poli, F. Vigotti, Roberto Spighi, C. Petrascu, V.G. Ableev, G. Vedovato, N. Mirfakhraee, A. Vitale, Elena Botta, F. Tosello, Antonio Zoccoli, P.P. Temnikov, Gianfranco Zosi, S. Tessaro, C. Guaraldo, R. Garfagnini, Marco Bruschi, G. Piragino, G. Puddu, Paola Gianotti, V.I. Tretyak, A.M. Rozhdestvensky, A. Maggiora, V. Lucherini, Massimo Piccinini, L. Venturelli, S. Marcello, Armando Lanaro, Andrea Bianconi, G. L. Usai, O. Y. Denisov, L. Busso, F. Balestra, M.P. Bussa, Stefania Vecchi, I. D'Antone, D. D'Isep, M. Corradini, Adriano Fontana, F. Nichitiu, G. Pauli, and A. Panzarasa

Subjects
Nuclear physics, Baryon, Physics, Rest (physics), Nuclear and High Energy Physics, Particle physics, Annihilation, Binary number
Published
1999

45. Measurement of the η(1440) → K±K0π± production rates from p annihilation at rest at three different hydrogen target densities [Phys. Lett. B 385 (1996) 493]

Author

A. Adamo, M. Morando, M. Capponi, Paolo Montagna, N. Mirfakhrai, Alberto Masoni, Antonio Zoccoli, V. Filippini, O.Yu. Denisov, Benedetto Giacobbe, D. Calvo, A.M. Rozhdestvensky, G. Puddu, L. Ferrero, A. Saino, Paola Salvini, M.G. Sapozhnikov, S. De Castro, E. Lodi Rizzini, P. Cerello, Massimo Piccinini, M.P. Bussa, Bruno Minetti, Antonietta Donzella, A. Grasso, Marco Bruschi, Stefania Vecchi, S. Serci, S.N. Prakhov, L. Santi, V. Lucherini, Andrea Fontana, Alberto Rotondi, E. Rossetto, A. Bertin, Michelangelo Agnello, V.I. Tretyak, L. Busso, C. Petrascu, G. Bendiscioli, F. Tosello, A. Maggiora, P.P. Temnikov, Gianfranco Zosi, P. Gianotti, S. Tessaro, L. Fava, D. Parena, A. Filippi, R. Garfagnini, Armando Lanaro, V.G. Ableev, D. D'Isep, Mauro Villa, A. Vezzani, L. Venturelli, C. Guaraldo, A. Lai, M. Corradini, Felice Iazzi, Corrado Cicalo, Antonio Ferretti, G. L. Usai, F. Nichitiu, A. Feliciello, S. Marcello, G. Pauli, F. Balestra, O.E. Gorchakov, Nicola Semprini-Cesari, L. Musa, F. Vigotti, M. Lombardi, A M Rosca, D. Galli, Elena Botta, Roberto Spighi, S. Costa, D. Panzieri, Tullio Bressani, U. Gastaldi, C. Cavion, Aldo Zenoni, A. Vitale, and Umberto Marini Bettolo Marconi

Subjects
Rest (physics), Nuclear and High Energy Physics, Annihilation, Hydrogen, Chemistry, chemistry.chemical_element, Production (computer science), Atomic physics
Abstract

Due to a most unfortunate technical mishap, half of the references in the list of references were not printed. Below the full list of references is being reprinted

Published
1997

46. Experimental set-up for asymmetry measurements in the elastic scattering at small angles (<10°) of 40 MeV polarized protons

Author

C. Marciano, A. Venaglioni, Alberto Rotondi, E. Lodi Rizzini, and G. Bendiscioli

Subjects
Physics, Elastic scattering, media_common.quotation_subject, Resolution (electron density), Magnetostriction, General Medicine, Asymmetry, Incident beam, Physics::Accelerator Physics, Angular resolution, Small-angle scattering, Spark chamber, Atomic physics, Nuclear Experiment, media_common
Abstract

An experimental set-up based on the use of a magnetostrictive read-out wire spark chamber is described. It has been used for the measurement of the asymmetry between 0° and 10° in the elastic scattering of 40 MeV polarized protons. It is characterized by a high angular resolution and allows to know the distribution of the protons in the incident beam. Details on the use of the magnetostrictive delay lines are given.

Published
1975

47. reaction cross section at 610 MeV/c

Author

D. Panzieri, F. Tosello, G. Zanella, G. Fumagalli, F. Balestra, M.P. Bussa, G. Piragino, A. Venaglioni, E. Lodi Rizzini, I.V. Falomkin, C. Guaraldo, G. Gervino, L. Ferrero, L. Busso, M.G. Sapozhnikov, Alberto Rotondi, A. Zenoni, A. Maggiora, Yu.A. Batusov, G. Bendiscioli, G.B. Pontecorvo, M. Vascon, and V. Filippini

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, chemistry, Antiproton, Physics::Accelerator Physics, chemistry.chemical_element, High Energy Physics::Experiment, Multiplicity (chemistry), Atomic physics, Nuclear Experiment, Helium, Magnetic field
Abstract

Antiproton helium reaction cross section has been measured at 179.6 MeV with a self shunted streamer chamber in a magnetic field. Charged prong multiplicity, branching ratios and 3He production probability are given. Comparison with p 2 H data is performed.

Published
1984

48. Determination of the ratio σ(p̄n)/σ(p̄p) from p̄4He reaction data

Author

L. Fava, L. Ferrero, A. Zenoni, E. Lodi Rizzini, Yu.A. Batusov, G. Bendiscioli, C. Guaraldo, Alberto Rotondi, F. Tosello, G. Piragino, D. Panzieri, A. Maggiora, Paola Salvini, I.V. Falomkin, F. Balestra, G.B. Pontecorvo, M.P. Bussa, L. Busso, and F. Nichitiu

Subjects
Nuclear physics, Physics, Rest (physics), Nuclear reaction, Nuclear and High Energy Physics, Annihilation, medicine.anatomical_structure, medicine, Atomic physics, Glauber, Nucleus
Abstract

The ratio R a b between the cross sections for the annihilation of p on n and on p bound in the 4 He nucleus at four p momenta (at rest, 192.8, 306.2 and 607.7 MeV/ c ) has been obtained by the analysis of p 4 He annihilation events detected with a self-shunted streamer chamber exposed to the LEAR p beams. R a b increases from 0.42 ± 0.05 at rest up to 0.66 ± 0.09 at 607.7 MeV/ c . The results are discussed in the light of Glauber theory analyses of p 2 H and p -nucleus data.

Published
1987

49. 3 He reaction cross section at 200 MeV/c

Author

F. Tosello, R. Barbieri, A. Haatuft, S.O. Sørensen, Paola Salvini, K. Myklebost, C. Guaraldo, M.G. Sapozhnikov, T. Jacobsen, G. Piragino, L. Busso, A. Venaglioni, F. Balestra, J.M. Olsen, A. Halsteinslid, Yu.A. Batusov, F.O. Breivik, G. Bendiscioli, I.V. Falomkin, V.I. Tretyak, A. Grasso, A. Maggiora, M.P. Bussa, E. Lodi Rizzini, S. Bossolasco, L. Ferrero, Alberto Rotondi, G.B. Pontecorvo, D. Panzieri, and A. Zenoni

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Light nucleus, Cross section (physics), Atomic physics
Abstract

Inelastic p - 3 He events at 192.8 MeV/ c are detected with a self-shunted streamer chamber. The measured reaction cross section is 392±23.8mb. This result is briefly discussed and compared with other reaction cross sections for low-energy p with light nuclei.

Published
1988

50. Measurement of p̄ 4He annihilation events detected in a self-shunted streamer chamber

Author

I.V. Falomkin, C. Guaraldo, G.B. Pontecorvo, G. Piragino, L. Ferrero, Alberto Rotondi, Paola Salvini, M.P. Bussa, L. Fava, M.G. Sapozhnikov, E. Lodi Rizzini, F. Tosello, F. Balestra, G. Fumagalli, A. Maggiora, L. Busso, D. Panzieri, A. Zenoni, Yu.A. Batusov, and G. Bendiscioli

Subjects
Physics, Nuclear and High Energy Physics, Annihilation, Meson, Physics::Instrumentation and Detectors, self-shunted streamer chamber, antiproton-He-4 annihilation, Particle detector, Charged particle, Nuclear physics, Pion, Helium-3, Measuring instrument, PS179, Instrumentation, Isotopes of helium, Nuclear Physics
Abstract

The measurement of angles and momenta, as well as the identification of the masses of the products of p 4He annihilation events detected in a self-shunted streamer chamber are described.

Published
1987

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