270 results on '"E., Lodi Rizzini"'
Search Results
2. PO-1023 Impact of 18F-FDG-PET/CT in the management of suspected RAI refractory DTC persistence/recurrence
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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
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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
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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
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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
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Oncology ,business.industry ,Selective internal radiation therapy ,Medicine ,Radiology, Nuclear Medicine and imaging ,Macroaggregated albumin ,Hematology ,business ,Nuclear medicine - Published
- 2021
5. Efficacy of Y90 resin microspheres treatments in patients affected by 'large' HCC tumors
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C. Pettinato, C. Mosconi, A. Cappelli, E. Lodi Rizzini, E. Tabacchi, S. Civollani, F. Monari, F. Trevisani, L. Reda, L. Strigari, and R. Golfieri
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Biophysics ,General Physics and Astronomy ,Radiology, Nuclear Medicine and imaging ,General Medicine - Published
- 2021
6. PO-1022 Local-control efficacy of EBRT on well-DTC bone metastases: single center real-life experience
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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
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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
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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
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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.
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- 2021
8. The ASACUSA CUSP: an antihydrogen experiment
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Eberhard Widmann, Johann Zmeskal, Yasunori Yamazaki, Nicola Zurlo, Kunio Suzuki, Yasuyuki Matsuda, Hiroyuki A. Torii, Naofumi Kuroda, S. Sakurai, O. Massiczek, E. Lodi Rizzini, K. Michishio, M. Leali, H. Nagahama, Yasuyuki Nagashima, Yugo Nagata, B. Wünschek, C. Sauerzopf, B. Radics, S. Van Gorp, M. Ohtsuka, Chloé Malbrunot, Stefan Ulmer, Yasuyuki Kanai, A. Mohri, M. Tajima, M. Diermaier, L. Venturelli, Valerio Mascagna, S. Federmann, Hiroyuki Higaki, D. J. Murtagh, and T. Mizutani
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Rydberg atom ,Nuclear and High Energy Physics ,Antiparticle ,Physics::Instrumentation and Detectors ,Scintillator ,Particle detector ,Nuclear physics ,Atomic beam ,Atomic and Molecular Physics ,Physics::Atomic and Molecular Clusters ,Physics::Atomic Physics ,Physical and Theoretical Chemistry ,Nuclear Experiment ,Antihydrogen ,Physics ,CPT invariance ,Atomic and Molecular Physics, and Optics ,Condensed Matter Physics ,Beamline ,Antiproton ,Antimatter ,Scintillation counter ,and Optics ,Atomic physics - Abstract
In order to test CPT symmetry between antihydrogen and its counterpart hydrogen, the ASACUSA collaboration plans to perform high precision microwave spectroscopy of ground-state hyperfine splitting of antihydrogen atom in-flight. We have developed an apparatus (“cusp trap”) which consists of a superconducting anti-Helmholtz coil and multiple ring electrodes. For the preparation of slow antiprotons and positrons, Penning- Malmberg type traps were utilized. The spectrometer line was positioned downstream of the cusp trap. At the end of the beamline, an antihydrogen beam detector was located, which comprises an inorganic Bismuth Germanium Oxide (BGO) single-crystal scintillator housed in a vacuum duct and surrounding plastic scintillators. A significant fraction of antihydrogen atoms flowing out the cusp trap were detected.
- Published
- 2015
9. Measurement of the antiproton–nucleus annihilation cross-section at low energy
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L. Venturelli, Y. Murakami, M. Prest, E. Lodi Rizzini, M. Corradini, Hiroyuki Yamada, Valerio Mascagna, M. Leali, Andrea Bianconi, Ryugo S. Hayano, Hossein Aghai-Khozani, Masaki Hori, and E. Vallazza
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Nuclear reaction ,Physics ,Nuclear and High Energy Physics ,Large Hadron Collider ,Annihilation ,010308 nuclear & particles physics ,Low energies ,Antiproton annihilations ,Nuclear reactions ,Antineutron ,01 natural sciences ,Nuclear physics ,Cross section (physics) ,medicine.anatomical_structure ,Low energy ,Antiproton ,0103 physical sciences ,medicine ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,Nuclear Experiment ,010306 general physics ,Nucleus - Abstract
Systematic measurements of the annihilation cross sections of low energy antinucleons were performed at CERN in the 80's and 90's. However the antiproton data on medium-heavy and heavy nuclear targets are scarce. The ASACUSA Collaboration at CERN has measured the antiproton annihilation cross section on carbon at 5.3 MeV: the value is (1.73 ± 0.25) barn. The result is compared with the antineutron experimental data and with the theoretical previsions.
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- 2018
10. Antiproton-nucleus annihilation cross section at low energy
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Ryugo S. Hayano, M. Corradini, E. Lodi-Rizzini, Hossein Aghai-Khozani, E. Vallazza, Hiroyuki Yamada, M. Prest, M. Leali, Valerio Mascagna, L. Venturelli, Masaki Hori, Y. Murakami, and Andrea Bianconi
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Physics ,Annihilation ,010308 nuclear & particles physics ,QC1-999 ,Nuclear Theory ,01 natural sciences ,Nuclear physics ,Cross section (physics) ,Physics and Astronomy (all) ,Low energy ,medicine.anatomical_structure ,Antiproton ,0103 physical sciences ,medicine ,Physics::Accelerator Physics ,Nuclear Experiment ,010306 general physics ,Nucleus - Abstract
The antinucleon-nuclei annihilation cross sections at low energies were systematically measured at CERN in the 80’s and 90’s with the LEAR facility and later with the Antiproton Decelerator. Unfortunately only few data exist for very low energy antiprotons (p
- Published
- 2018
11. Experimental technique for antiproton-nucleus annihilation cross section measurements at low energy
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Hossein Aghai-Khozani, M. Leali, Hiroyuki Yamada, Ryugo S. Hayano, M. Corradini, L. Venturelli, E. Lodi-Rizzini, Luigi Solazzi, Y. Murakami, Masaki Hori, Valerio Mascagna, E. Vallazza, and M. Prest
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Physics ,Annihilation ,010308 nuclear & particles physics ,QC1-999 ,01 natural sciences ,Nuclear physics ,Cross section (physics) ,Physics and Astronomy (all) ,Low energy ,medicine.anatomical_structure ,Antiproton ,0103 physical sciences ,medicine ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,010306 general physics ,Nuclear Experiment ,Nucleus - Abstract
The interaction of very low energy antiprotons (ps) and antineutrons (ns) with nuclei is interesting for its influence on both fundamental cosmology and nuclear physics. Measuring the annihilation cross section of antimatter on matter can help in solving the universe matter-antimatter puzzle and could give relevant hints in the definition of strong interaction model parameters as well. The ASACUSA collaboration recently measured the antiproton-carbon annihilation cross section at 5.3 MeV of kinetic energy of the incoming antiproton. The experimental apparatus consisted in a vacuum chamber containing thin foils (~0.7-1 μm) of carbon crossed by a bunched beam of antiprotons from the CERN Antiproton Decelerator (AD). The fraction of antiprotons annihilating on the target nucleons gives origin to charged pions which can be detected and counted by segmented scintillators placed outside the chamber. This work describes the experimental details of the apparatus and the technique to perform the cross section measurements.
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- 2018
12. The Development of the Antihydrogen Beam Detector: Toward the Three Dimensional Tracking with a BGO Crystal and a Hodoscope
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M. Tajima, Yasuyuki Matsuda, Naofumi Kuroda, Yasunori Yamazaki, Chloé Malbrunot, P. Dupre, Eberhard Widmann, Horst Breuker, C. Kaga, Yasuyuki Kanai, Valerio Mascagna, M. Leali, Yugo Nagata, C. Sauerzopf, O. Massiczek, B. Radics, E. Lodi Rizzini, M. C. Simon, A. A. Capon, L. Venturelli, B. Kolbinger, Hiroyuki Higaki, and T. Matsudate
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Physics ,Physics::General Physics ,Physics::Instrumentation and Detectors ,Detector ,Scintillator ,Tracking (particle physics) ,Crystal ,Nuclear physics ,Hodoscope ,High Energy Physics::Experiment ,Development (differential geometry) ,Physics::Atomic Physics ,Detectors and Experimental Techniques ,Nuclear Experiment ,Antihydrogen ,Beam (structure) - Abstract
We developed an antihydrogen beam detector for the microwave spectroscopy of the antihydrogen hyperfine splitting. The detector consists of a position sensitive BGO calorimeter and a hodoscope. We report test experiments for the position sensitive readout from a non-segmented BGO crystal., Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016), ISBN:978-4-89027-125-2
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- 2017
13. Experimental Apparatus for Antiproton-Nucleus Annihilation Cross Section Measurements at Low Energy
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H. Aghai-Kozani, M. Prest, V. Mascagna, E. Lodi-Rizzini, Hiroyuki Yamada, Ryugo S. Hayano, M. Corradini, E. Vallazza, M. Leali, Y. Murakami, Masaki Hori, Luigi Solazzi, and L. Venturelli
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Physics ,Nuclear physics ,Cross section (physics) ,medicine.anatomical_structure ,Annihilation ,Low energy ,Antiproton ,Scintillation counter ,medicine ,Carbon nucleus ,Nucleus ,Charged particle - Published
- 2017
14. Progress of Antihydrogen Beam Production Using a Double Cusp Trap
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B. Radics, L. Venturelli, Mascagna, J. Zmeskal, B. Kolbinger, C. Sauerzopf, P. Dupre, M. Tajima, Horst Breuker, M. Leali, Yugo Nagata, Yasunori Yamazaki, C. Kaga, M. Diermaier, Yasuyuki Kanai, E. Widmann, Naofumi Kuroda, Stefan Ulmer, Kunio Suzuki, O. Massiczek, Chloé Malbrunot, Yasuhiro H. Matsuda, M. C. Simon, A. A. Capon, E. Lodi Rizzini, Hiroyuki Higaki, and T. Matsudate
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Physics ,Physics::General Physics ,Atomic beam ,010308 nuclear & particles physics ,CPT symmetry ,Physics::Instrumentation and Detectors ,CPT invariance ,01 natural sciences ,Accelerators and Storage Rings ,Trap (computing) ,Antihydrogen ,0103 physical sciences ,Physics::Atomic and Molecular Clusters ,Cusp (anatomy) ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,Physics::Atomic Physics ,Atomic physics ,Detectors and Experimental Techniques ,010306 general physics ,Beam (structure) - Abstract
We report the progress of the H¯ beam production experiment and recent developments of the double cusp trap to improve of the beam intensity of the H¯ atomic beams, the ASACUSA Micromegas tracker to monitoring the antihydrogen synthesis and the antihydrogen beam detector., JPS Conference Proceedings, 18, Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016), ISBN:978-4-89027-125-2
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- 2017
- Full Text
- View/download PDF
15. Antiparticle cloud temperatures for antihydrogen experiments
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Valerio Mascagna, Andrea Bianconi, L. Venturelli, M. Charlton, and E. Lodi Rizzini
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Physics ,Particle physics ,Antiparticle ,010308 nuclear & particles physics ,business.industry ,Cloud computing ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Rule of thumb ,Nuclear physics ,Simple (abstract algebra) ,Atomic and Molecular Physics ,0103 physical sciences ,Radiative transfer ,and Optics ,010306 general physics ,business ,Antihydrogen - Abstract
A simple rate-equation description of the heating and cooling of antiparticle clouds under conditions typical of those found in antihydrogen formation experiments is developed and analyzed. We include single-particle collisional, radiative, and cloud expansion effects and, from the modeling calculations, identify typical cooling phenomena and trends and relate these to the underlying physics. Some general rules of thumb of use to experimenters are derived.
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- 2017
16. Measurements and 3D reconstruction of antimatter annihilations with the ASACUSA Micromegas Tracker
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T. Y. Kanai, Naofumi Kuroda, M. Leali, M. Tajima, B. Radics, C. Kaga, D. J. Murtagh, Yasuyuki Matsuda, Valerio Mascagna, Yasunori Yamazaki, T. Matsudate, Y. Higashi, Horst Breuker, P. Dupre, Hiroyuki Higaki, H. A. Torii, L. Venturelli, S. Van Gorp, Stefan Ulmer, and E. Lodi Rizzini
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Physics ,antihydrogen ,micromegas ,Particle physics ,tracking detector ,Physics::Instrumentation and Detectors ,3D reconstruction ,MicroMegas detector ,Nuclear physics ,Physics in General ,Antimatter ,High Energy Physics::Experiment ,Physics::Atomic Physics - Abstract
The aim of the ASACUSA-CUSP experiment is to form a beam of antihydrogen atoms for in-flight precision spectroscopic measurements. This is performed by trapping and mixing antiprotons and positrons in a common nested-well potential, which is sitting in a double-cusp magnetic field with minimum-B field configuration. We have built a tracking detector, the ASACUSA Micromegas Tracker (AMT) [1], to monitor and resolve annihilations on-axis from annihilations on the trapping electrode walls of the experiment, which latter is a general signature of antihydrogen formation. Data taken during the summer of 2015 is presented in order to demonstrate the first performance of the AMT detector. In particular, data from on-axis trapping and slow extraction of antiprotons is used to illustrate the vertex reconstruction capability of the detector., JPS Conference Proceedings, 18, Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016), ISBN:978-4-89027-125-2
- Published
- 2017
17. Recent Results on the Antiproton-Nucleus Annihilation Cross Section at Low Energy
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V. Mascagna, Ryugo S. Hayano, E. Vallazza, M. Corradini, Masaki Hori, E. Lodi-Rizzini, Hiroyuki Yamada, M. Leali, M. Prest, Y. Murakami, Hossein Aghai-Khozani, and L. Venturelli
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Physics ,Nuclear physics ,Cross section (physics) ,medicine.anatomical_structure ,Annihilation ,Low energy ,Antiproton ,medicine ,Nucleus - Published
- 2017
18. Experimental investigation of ≈130 keV kinetic energy antiprotons annihilation on nuclei
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Hossein Aghai-Khozani, D. Barna, N. Zurlo, M. Leali, Ryugo S. Hayano, M. Corradini, M. Prest, E. Lodi-Rizzini, Takayoshi Kobayashi, L. Venturelli, K. Todoroki, E. Vallazza, Valerio Mascagna, Anna Sótér, and Masaki Hori
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Nuclear and High Energy Physics ,antiprotons, annihilation cross section, nuclear physics ,CERN AD ,media_common.quotation_subject ,Nuclear Theory ,Antiproton ,Kinetic energy ,Asymmetry ,Nuclear physics ,nuclear physics ,Atomic and Molecular Physics ,Coulomb ,Neutron ,Physical and Theoretical Chemistry ,Nuclear Experiment ,media_common ,Mass number ,Physics ,Annihilation cross section ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Annihilation ,Antimatter ,and Optics ,Atomic physics ,antiprotons - Abstract
The study of the antiproton ( $\bar {p}$ ) annihilation cross section on nuclei at low energies (eV-MeV region) has implications for fundamental cosmology as well as for nuclear physics. Concerning the former, different models try to explain the matter/antimatter asymmetry in the universe assuming the existence of the so-called “islands” where antinucleon-nucleon annihilations occur in the border region (Cohen et al. Astrophys. J. 495, 539–549, 1998), while, from the nuclear physics point of view, the annihilation process is a valuable tool to evaluate the neutron/proton ratio in order to probe the external region of the nucleus (Gupta et al. Nucl. Phys. B 70(3), 414–424, 1974). The existing data of antinucleon-nucleon (or -nucleus) annihilation cross-sections are mainly confined to energies above ≈1 MeV, while the cross section measured at LEAR in the 80’s-90’s (mostly with light targets Agnello et al. Phys. Lett. B 256, 349–353, 1991; Bertin et al. Phys. Lett. B 369, 77–85, 1996; Bertin et al. Phys. Lett. B 414, 220–228, 1997; Zenoni et al. Phys. Lett. B 461, 405–412, 1999; Bianconi et al. Phys. Lett. B 481, 194–198, 2000; Bianconi et al. Phys. Lett. B 492, 254–258, 2000) showed an unexpected behaviour for energies below 1 MeV (Bianconi et al. Phys. Lett. B 483, 353–359, 2000; Bianconi et al. Phys. Rev. C 62, 014611-7, 2000; Batty et al. Nucl. Phys. A 689, 721–740, 2001). The results showed a saturation with the atomic mass number against the A 2/3 trend which is observed for higher energies (being A the target mass number). The ASACUSA collaboration at CERN recently measured antiproton annihilation cross section on different kinds of nuclei with a $\bar {p}$ kinetic energy of 5.3 MeV (Bianconi et al. Phys. Lett. B 704, 461–466, 2011; Corradini et al. Nucl. Instr. Methods A 711, 12–20, 2013). Such results proved compatibility with the black-disk model with the Coulomb correction. But till now experimental difficulties prevented the investigation at energies below ≈1 MeV. In 2012, the 100 keV region has been investigated for the first time (Aghai-Khozani et al. Eur. Phys. J. Plus 127, 125–128, 2012). We present here the first preliminary results of this experiment.
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- 2014
19. New results of the antiproton-carbon annihilation cross section measurement at low energies
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Masaki Hori, M. Prest, Hiroyuki Yamada, M. Corradini, E. Vallazza, E. Lodi Rizzini, L. Venturelli, Y. Murakami, H Aghai–Khozani, Ryugo S. Hayano, Mascagna, M. Leali, and Luigi Solazzi
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Physics ,Large Hadron Collider ,Annihilation ,010308 nuclear & particles physics ,QC1-999 ,Nuclear Theory ,chemistry.chemical_element ,01 natural sciences ,Antiproton Decelerator ,Nuclear physics ,Cross section (physics) ,Physics and Astronomy (all) ,Low energy ,chemistry ,Antiproton ,0103 physical sciences ,Physics::Accelerator Physics ,Nuclear Physics - Experiment ,Physics::Atomic Physics ,010306 general physics ,Nuclear Experiment ,Carbon - Abstract
The antinucleon-nuclei annihilation cross section at very low energy has been measured at the LEAR facility (CERN) during the 80's and 90's and recently at the Antiproton Decelerator. The results have raised some interesting questions that still need answers. The ASACUSA collaboration performed an experiment to measure the sigma_ann of 100 MeV/c antiprotons on carbon target and the preliminary results are presented here.
- Published
- 2016
20. Antihydrogen synthesis in a double-CUSP trap towards test of the CPT-symmetry
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L. Venturelli, M. Leali, H. Breuker, Y. Abo, Shumpei Ishikawa, S. Van Gorp, E. Lodi Rizzini, Y. Higashi, Stefan Ulmer, Yasuyuki Matsuda, Hiroyuki Higaki, C. Kaga, Naofumi Kuroda, P. Dupre, Yasunori Yamazaki, Valerio Mascagna, D. J. Murtagh, Nicola Zurlo, Yasuyuki Kanai, Y. Nagata, M. Tajima, and B. Radics
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0301 basic medicine ,Nuclear and High Energy Physics ,CPT symmetry ,01 natural sciences ,Nuclear physics ,03 medical and health sciences ,Antimatter micromegas ,Atomic and Molecular Physics ,0103 physical sciences ,Atom ,Physics::Atomic and Molecular Clusters ,Physics::Atomic Physics ,Physical and Theoretical Chemistry ,Vertex reconstruction ,010306 general physics ,Antihydrogen ,Physics ,Large Hadron Collider ,Spectrometer ,Tracking ,Detector ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,030104 developmental biology ,Antiproton ,Physics::Accelerator Physics ,and Optics ,Atomic physics ,Beam (structure) - Abstract
The aim of the ASACUSA-CUSP experiment at CERN is to produce a cold, polarised antihydrogen beam and perform a high precision measurement of the ground-state hyperfine transition frequency of the antihydrogen atom and compare it with that of the hydrogen atom using the same spectroscopic beam line. Towards this goal a significant step was successfully accomplished: synthesised antihydrogen atoms have been produced in a CUSP magnetic configuration and detected at the end of our spectrometer beam line in 2012 [1]. During a long shut down at CERN the ASACUSA-CUSP experiment had been renewed by introducing a new double-CUSP magnetic configuration and a new semi-cylindrical tracking detector (AMT) [2], and by improving the transport feature of low energy antiproton beams. The new tracking detector monitors the antihydrogen synthesis during the mixing cycle of antiprotons and positrons. In this work the latest results and improvements of the antihydrogen synthesis will be presented including highlights from the last beam time.
- Published
- 2016
21. Instrumentation for measurement of in-flight annihilations of 130 keV antiprotons on thin target foils
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M. Corradini, Hossein Aghai-Khozani, E. Lodi-Rizzini, Ryugo S. Hayano, L. Venturelli, V. Prest, D. De Salvador, Anna Sótér, K. Todoroki, L. Vallazza, Valerio Mascagna, M. Leali, D. Barna, and Masaki Hori
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Physics ,Nuclear and High Energy Physics ,Annihilation ,Nuclear cross section ,010308 nuclear & particles physics ,Antiproton ,Kinetic energy ,01 natural sciences ,Nuclear physics ,Time of flight ,symbols.namesake ,Pion ,0103 physical sciences ,symbols ,Physics::Accelerator Physics ,Rutherford scattering ,Instrumentation ,Atomic physics ,010306 general physics ,Beam (structure) - Abstract
We describe the instrumentation for an experiment to measure the cross sections of antiprotons with kinetic energies of 130±10 keV annihilating on carbon, palladium, and platinum target foils of sub-100 nm thicknesses. A 120 ns long pulsed beam containing 10 5 – 10 6 antiprotons was allowed to traverse the foils, and the signal annihilations that resulted from this were isolated using a time-of-flight method. Backgrounds arose from Rutherford scattering of the antiprotons off the target foils, their annihilations in the target chamber walls, and π → μ → e decay of the charged pions that emerged from the annihilations. Some antiprotons slowed down and annihilated in the contamination on the target surfaces. This reduced the signal-to-background ratio of the measurement.
- Published
- 2016
22. Towards Measuring the Ground State Hyperfine Splitting of Antihydrogen -- A Progress Report
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M. C. Simon, Yasuyuki Matsuda, S. Vamosi, A. A. Capon, Sebastian Lehner, P. Dupre, M. Leali, Chloé Malbrunot, Yasunori Yamazaki, Naofumi Kuroda, E. Lodi Rizzini, S. Van Gorp, B. Kolbinger, O. Massiczek, Stefan Ulmer, C. Sauerzopf, Y. Higashi, Eberhard Widmann, L. Venturelli, Yugo Nagata, H. Breuker, Yasuyuki Kanai, C. Kaga, Valerio Mascagna, M. Diermaier, M. Tajima, Ken Suzuki, B. Radics, Hiroyuki Higaki, Johann Zmeskal, and D. J. Murtagh
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Nuclear and High Energy Physics ,Physics - Instrumentation and Detectors ,Physics::Instrumentation and Detectors ,FOS: Physical sciences ,Scintillator ,01 natural sciences ,Field-ioniser ,Atomic and Molecular Physics ,0103 physical sciences ,Principal quantum number ,Precision spectroscopy ,Detectors and Experimental Techniques ,Physical and Theoretical Chemistry ,010306 general physics ,Spectroscopy ,Antihydrogen ,Hyperfine structure ,Physics ,010308 nuclear & particles physics ,Detector ,Instrumentation and Detectors (physics.ins-det) ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,CPT ,PIPS ,Atomic physics ,and Optics ,Ground state ,Beam (structure) - Abstract
We report the successful commissioning and testing of a dedicated field-ioniser chamber for measuring principal quantum number distributions in antihydrogen as part of the ASACUSA hyperfine spectroscopy apparatus. The new chamber is combined with a beam normalisation detector that consists of plastic scintillators and a retractable passivated implanted planar silicon (PIPS) detector., Comment: 5 pages, 2 figures, 6th International Symposium on Symmetries in Subatomic Physics (SSP2015)
- Published
- 2016
- Full Text
- View/download PDF
23. Direct detection of antihydrogen atoms using a BGO crystal
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L. Venturelli, Mascagna, H. A. Torii, M. Leali, Yasuyuki Matsuda, Yasunori Yamazaki, M. Tajima, Yugo Nagata, E. Lodi-Rizzini, Naofumi Kuroda, Miki Ohtsuka, and N. Zurlo
- Subjects
Physics::General Physics ,Antimatter ,Nuclear and High Energy Physics ,Cosmic ray ,01 natural sciences ,Spectral line ,Nuclear physics ,Pion ,0103 physical sciences ,Physics::Atomic and Molecular Clusters ,Physics::Atomic Physics ,Multiplicity (chemistry) ,Nuclear Experiment ,010306 general physics ,Antihydrogen ,Instrumentation ,Physics ,Cosmic ray background suppression ,Detector ,Inorganic scintillator ,Annihilation ,010308 nuclear & particles physics ,Atomic physics - Abstract
The ASACUSA collaboration has developed a detector consisting of a large size BGO crystal to detect an atomic antihydrogen beam, and performed the direct detection of antihydrogen atoms. Energy spectra from antihydrogen annihilation on the BGO crystal are discussed in comparison to simulation results from the GEANT4 toolkit. Background mainly originating from cosmic rays were strongly suppressed by analyzing the energy deposited in the BGO and requiring a multiplicity of charged pions. Thus antihydrogen events were identified.
- Published
- 2016
24. The ASACUSA CUSP: an antihydrogen experiment
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N. Kuroda, S. Ulmer, D. J. Murtagh, S. Van Gorp, Y. Nagata, M. Diermaier, S. Federmann, M. Leali, C. Malbrunot, V. Mascagna, O. Massiczek, K. Michishio, T. Mizutani, A. Mohri, H. Nagahama, M. Ohtsuka, B. Radics, S. Sakurai, C. Sauerzopf, K. Suzuki, M. Tajima, H. A. Torii, L. Venturelli, B. Wünschek, J. Zmeskal, N. Zurlo, H. Higaki, Y. Kanai, E. Lodi Rizzini, Y. Nagashima, Y. Matsuda, E. Widmann, and Y. Yamazaki
- Published
- 2015
25. In-flight antiproton annihilation on nuclei at low energies
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M. Prest, K. Todoroki, E. Lodi-Rizzini, L. Venturelli, A. Mozzanica, Anna Sótér, M. Leali, Takumi Kobayashi, Maurizio Corradini, E. Vallazza, Nicola Zurlo, Masaki Hori, and Valerio Mascagna
- Subjects
Physics ,antiproton ,annihilation ,cross section ,Nuclear and High Energy Physics ,Particle physics ,Annihilation ,Large Hadron Collider ,Physics::Instrumentation and Detectors ,chemistry.chemical_element ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Nuclear physics ,Cross section (physics) ,chemistry ,Antiproton ,Physics::Accelerator Physics ,Physical and Theoretical Chemistry ,Experimental methods ,Tin ,Beam (structure) - Abstract
The results of the annihilation cross sections measurement of 5.3 MeV antiprotons on nickel, tin, platinum and Mylar targets performed by the ASACUSA Collaboration at CERN are presented and compared with the existing data and models. From the experimental point of view the presented data are the first measurement of antinucleon annihilation cross sections at low energies obtained with a pulsed beam. This results open the road for the next measurements at the very low energies of the order of 100 keV that are in progress by the ASACUSA Collaboration. The experimental method foreseen for the 100 keV measurement is illustrated.
- Published
- 2011
26. 223Ra-chloride therapy: the first multidisciplinary and multicenter Italian study
- Author
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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
27. The mechanisms of antihydrogen formationThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at University of Windsor, Windsor, Ontario, Canada on 21–26 July 2008
- Author
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N. Zurlo, L. Venturelli, and E. Lodi Rizzini
- Subjects
Nuclear physics ,Physics ,Large Hadron Collider ,Antiproton ,Radiative capture ,General Physics and Astronomy ,Windsor ,Antihydrogen ,Penning trap ,Ontario canada ,Preliminary analysis - Abstract
Some years have passed since the report of the first production of cold antihydrogen by the Athena Collaboration and the Atrap Collaboration at CERN, but no clear answer has been given about the roles of the two mechanisms responsible for antihydrogen formation. A new preliminary analysis of the data acquired by the Athena Collaboration in different experimental conditions seems to suggest that three-body recombination mechanism is dominant in the first tens of seconds of the overlapping of the injected antiproton cloud with the positron plasma in the nested Penning trap, while radiative capture starts to become dominant afterwards.
- Published
- 2009
28. Two-prong πHe interactions at 106 MeV
- Author
-
S. Baginyan, V. I. Pryanichnikov, M. Schepkin, I. A. Belolaptikov, G. B. Pontecorvo, V. Lyashenkov, Yu.A. Batusov, E. Lodi Rizzini, V.V. Ivanov, A. Maggiora, I. Gnesi, Vladimir Frolov, V.A. Panyushkin, A. Grasso, I. Smirnova, N.S. Angelov, T. Blokhintseva, M. Maggiora, D. Panzieri, L. Venturelli, N.A. Russakovich, Andrea Ferrero, A.M. Rozhdestvensky, F. Balestra, V. M. Grebenyuk, V.A. Butenko, A. Kirilov, A. Bonyushkina, L. Fava, V.A. Drozdov, V.E. Kovalenko, A. Moiseenko, Andrea Bianconi, A. Dem’yanov, Gianfranco Zosi, M.L. Colantoni, M. Chiosso, B. Parsamyan, R. Garfagnini, and G. Piragino
- Subjects
Physics ,Nuclear reaction ,Elastic scattering ,Nuclear physics ,Nuclear and High Energy Physics ,Helium-4 ,Meson ,Nuclear fusion ,Neutron ,Atomic physics ,Nucleon ,Charged particle - Abstract
π-4He interactions at 106MeV, with two secondary charged particles in the final state, have been studied using a self-shunted streamer chamber in a 0.65T magnetic field and equipped with two CCD videocameras for obtaining digitized stereo-images of nuclear events occurring within the fiducial volume of the streamer chamber. Branching ratios for the various interaction channels are deduced. Evidence is presented for a reaction channel involving a γ produced in the final state, as well as for the first observation of direct Δ- -resonance production. Cross-section distributions for the elastic and quasi-elastic interaction channels are also reported.
- Published
- 2007
29. Operation and performance of the FAST detector at the AD machine
- Author
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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
30. Beam Diagnostics for Measurements of In-Flight Annihilation Cross Sections of Antiprotons at 130 keV
- Author
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Maurizio Corradini, Valerio Mascagna, Anna Soter, Masaki Hori, E. Vallazza, Ryugo S. Hayano, L. Venturelli, E. Lodi-Rizzini, D. Barna, M. Prest, M. Leali, K. Todoroki, Takumi Kobayashi, Hossein Aghai-Khozani, and Nicola Zurlo
- Subjects
Nuclear physics ,Physics ,Particle physics ,Large Hadron Collider ,Annihilation ,Antiproton ,Beam (structure) - Abstract
Hossein Aghai-Khozani1,2, Daniel Barna3,4, Maurizio Corradini5,6, Ryugo Hayano4, Masaki Hori1,4, Takumi Kobayashi4, Marco Leali5,6, Evandro Lodi-Rizzini5,6, Valerio Mascagna5,6, Michela Prest7,8, Anna Soter1, Koichi Todoroki4, Erik Vallazza9, Luca Venturelli5,6, and Nicola Zurlo5,6 1Max-Planck-Institut fur Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany 2Physics Department, CERN, 1211 Geneva 23, Switzerland 3Wigner Institute for Particle and Nuclear Physics, H-1525 Budapest, Hungary 4Department of Physics, University of Tokyo, Hongo7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan 5Dipartimento di Collegato di Brescia, 25133 Brescia, Italy 6INFN, Gruppo Collegato di Brescia, 25133 Brescia, Italy 7Dipartimento di Scienze Fisiche e Matematiche, Universita di Como, I-22100 Como, Italy 8INFN, Sezione di Milano Bicocca, I-20126 Milano, Italy 9INFN, Sezione di Trieste, I-34127 Trieste, Italy
- Published
- 2015
31. Scintillating bar detector for antiproton annihilations measurements
- Author
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M. Corradini, M. Leali, E. Lodi Rizzini, V. Mascagna, M. Prest, E. Vallazza, and L. Venturelli
- Published
- 2015
32. First measurement of the antiproton-nucleus annihilation cross section at 125 keV
- Author
-
Ryugo S. Hayano, D. Seiler, M. Prest, M. Corradini, Daniel Barna, K. Todoroki, Masaki Hori, E. Lodi-Rizzini, Hossein Aghai-Khozani, M. Leali, E. Vallazza, D. De Salvador, L. Venturelli, Anna Sótér, Takayoshi Kobayashi, and Valerio Mascagna
- Subjects
Physics ,Nuclear reaction ,Antiparticle ,Nuclear and High Energy Physics ,Annihilation ,Cross section ,Antiproton ,Nuclear ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Physical and Theoretical Chemistry ,Baryon ,Nuclear physics ,Cross section (physics) ,Antimatter ,Atomic and Molecular Physics ,Atomic physics ,and Optics ,Nucleon - Abstract
The first observation of in-flight antiproton-nucleus annihilation at ∼130 keV obtained with the ASACUSA detector has demonstrated that the measurement of the cross section of the process is feasible at such extremely low energies Aghai-Khozani, H., et al., Eur. Phys. J. Plus 127, 55 (2012). Here we present the results of the data analysis with the evaluations of the antiproton annihilation cross sections on carbon, palladium and platinum targets at ∼125 keV.
- Published
- 2015
33. Search for the pentaquark in antiproton 4He annihilation at rest
- Author
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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
34. φ and ω meson production in annihilation and the OZI rule
- Author
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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
35. 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
36. 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
37. 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
38. 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
39. The ATHENA experiment for the study of antihydrogen
- Author
-
Germano Bonomi, Andrea Fontana, Alberto Rotondi, G. Testera, Nicola Zurlo, Claude Amsler, L. Venturelli, V. Lagomarsino, Alban Kellerbauer, and E. Lodi Rizzini
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Large Hadron Collider ,Astronomy and Astrophysics ,Penning trap ,Atomic and Molecular Physics, and Optics ,Nuclear physics ,Antiproton Decelerator ,Positron ,Antiproton ,Protonium ,Antimatter ,Physics::Atomic Physics ,Antihydrogen - Abstract
In 2002, the ATHENA experiment was the first to produce large amounts of antihydrogen atoms at the CERN Antiproton Decelerator (AD). In this review article, we collect and discuss all the relevant results of the experiment: antiproton and positron cooling and their recombination dynamics in the nested Penning trap, the methods used to unambiguously identify the antiatoms as well as the protonium background, the dependence of the antihydrogen formation on mixing time and temperature. An attempt to interpret the results in terms of the two-body and three-body formation reactions, taking into account the complicated nested-trap dynamics, is also made. The relevance of the ATHENA results on future experiments is discussed, together with a short overview of the current antimatter physics at the AD.
- Published
- 2014
40. Enhancement of annihilation cross sections by electric interactions between the antineutron and the field of a large nucleus
- Author
-
E. Lodi Rizzini, V. Mascagna, Andrea Bianconi, and L. Venturelli
- Subjects
Physics ,Nuclear and High Energy Physics ,Annihilation ,Nuclear Theory ,FOS: Physical sciences ,Antineutron ,Nuclear physics ,Nuclear Theory (nucl-th) ,High Energy Physics - Phenomenology ,Polarization density ,Dipole ,High Energy Physics - Phenomenology (hep-ph) ,Antiproton ,Electric field ,Neutron ,Vacuum polarization - Abstract
Data relative to antineutron and antiproton annihilation on large nuclei in the range 75-200 MeV/c present two unexpected features: (a) antineutron and antiproton cross sections have a similar size, (ii) the rise of the antineutron cross section at decreasing energy is much steeper than predictable for an inelastic process of purely strong nature at that energy. The observed behavior of antineutron-nucleus annihilations is similar to what would be expected for antiproton-nucleus annihilations, where Coulomb attraction focusses antiproton trajectories towards the nucleus, enhancing the inelastic cross section by a factor O(1/p) with respect to antineutrons on the same target. This results in a 1/p^2 behavior at small energies. The presence of a similar enhancement in the antineutron case may only be justified by an interaction with a longer range than strong interactions. Excluding a Coulomb force because of the antineutron neutrality, and taking into account that an intrinsic electric dipole is forbidden for the antineutron, the next choice is an electric dipole that is induced by the nuclear electric field. Recent theoretical works have shown that a non-negligible electric polarization may be induced in a neutron by QED vacuum polarization. Assuming this as a possibility, we have used a simple model to calculate the polarization strengths that are needed to fit the available data in terms of this effect. These are within the magnitude predicted by the vacuum polarization model. We have also discussed alternative scenarios that could induce an electric polarization of the antineutron as a consequence of the interplay between strong and e.m. interactions., Comment: 6 pages 2 figures
- Published
- 2014
41. A source of antihydrogen for in-flight hyperfine spectroscopy
- Author
-
Hiroyuki A. Torii, Eberhard Widmann, Valerio Mascagna, H. Nagahama, M. Tajima, Johann Zmeskal, C. Sauerzopf, B. Radics, Chloé Malbrunot, A. Mohri, T. Mizutani, Yasuyuki Kanai, E. Lodi Rizzini, Hiroyuki Higaki, S. Sakurai, Yasuyuki Nagashima, K. Michishio, M. Leali, Y. Nagata, D. J. Murtagh, Yasuyuki Matsuda, Nicola Zurlo, B. Wu¨nschek, L. Venturelli, O. Massiczek, S. Van Gorp, M. Ohtsuka, Stefan Ulmer, Ken Suzuki, M. Diermaier, Naofumi Kuroda, S. Federmann, and Yasunori Yamazaki
- Subjects
Genetics and Molecular Biology (all) ,Physics::General Physics ,CPT symmetry ,Physics beyond the Standard Model ,General Physics and Astronomy ,Biochemistry ,01 natural sciences ,Article ,General Biochemistry, Genetics and Molecular Biology ,Standard Model ,Nuclear physics ,Physics and Astronomy (all) ,0103 physical sciences ,Nuclear Physics - Experiment ,Physics::Atomic Physics ,010306 general physics ,Spectroscopy ,Antihydrogen ,Hyperfine structure ,Physics ,Multidisciplinary ,010308 nuclear & particles physics ,Chemistry (all) ,General Chemistry ,Symmetry (physics) ,Antiproton ,Biochemistry, Genetics and Molecular Biology (all) ,Particle Physics - Experiment - Abstract
Antihydrogen, a positron bound to an antiproton, is the simplest antiatom. Its counterpart—hydrogen—is one of the most precisely investigated and best understood systems in physics research. High-resolution comparisons of both systems provide sensitive tests of CPT symmetry, which is the most fundamental symmetry in the Standard Model of elementary particle physics. Any measured difference would point to CPT violation and thus to new physics. Here we report the development of an antihydrogen source using a cusp trap for in-flight spectroscopy. A total of 80 antihydrogen atoms are unambiguously detected 2.7 m downstream of the production region, where perturbing residual magnetic fields are small. This is a major step towards precision spectroscopy of the ground-state hyperfine splitting of antihydrogen using Rabi-like beam spectroscopy., Comparing hydrogen and antihydrogen—its antimatter counterpart—provides important tests of fundamental symmetries in the Standard Model. Kuroda et al. present a source of antihydrogen atoms that may provide high-precision in-flight measurements of their ground-state hyperfine splitting.
- Published
- 2014
42. 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
43. Contribution from and waves in annihilation at rest
- Author
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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
44. [Untitled]
- Author
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C. Lenz Cesar, M. J. T. Collier, Niels Madsen, G. Testera, G. Rouleau, R. Landua, C. Carraro, V. Filippini, M. C. Fujiwara, R. Funakoshi, P. Genova, P. Riedler, Michael H. Holzscheiter, Michael Doser, Claude Amsler, G. Manuzio, G. Bendiscioli, Alessandro Variola, T. Yamazaki, J. S. Hangst, W. Joffrain, P. D. Bowe, Alberto Rotondi, H. Pruys, Germano Bonomi, M. Macri, P. Montagna, D. P. van der Werf, L. Venturelli, L. V. Jørgensen, M. Marchesotti, Adriano Fontana, M. Amoretti, K.S. Fine, E. Lodi-Rizzini, Ryugo S. Hayano, Hiroyuki Higaki, V. Lagomarsino, C. Regenfus, D. Lindelöf, A. Bouchta, T. L. Watson, Yasunori Yamazaki, D. Grögler, Paola Salvini, and M. Charlton
- Subjects
Physics ,Physics::General Physics ,Nuclear and High Energy Physics ,Large Hadron Collider ,CPT symmetry ,Condensed Matter Physics ,Penning trap ,Atomic and Molecular Physics, and Optics ,Antiproton Decelerator ,Nuclear physics ,Positron ,Antiproton ,Physics::Atomic and Molecular Clusters ,Physics::Accelerator Physics ,High Energy Physics::Experiment ,Physics::Atomic Physics ,Physical and Theoretical Chemistry ,Antihydrogen - Abstract
The ATHENA experiment at the Antiproton Decelerator facility at CERN aims at testing CPT symmetry with antihydrogen. An overview of the experiment, together with preliminary results of development towards the production of slow antihydrogen are reported.
- Published
- 2001
45. Experimental evidence of antiproton reflection by a solid surface
- Author
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R. Donà, A. Cristiano, E. Lodi Rizzini, L. Venturelli, M. Corradini, Andrea Bianconi, M. Leali, N. Zurlo, A. Bianconi, M. Corradini, A. Cristiano, M. Leali, E. Lodi Rizzini, L. Venturelli, N. Zurlo, and R. Donà
- Subjects
Physics ,Range (particle radiation) ,Annihilation ,Scattering ,Monte Carlo method ,FOS: Physical sciences ,Antiprotons · Surfaces · Coulombic interaction ,Atomic and Molecular Physics, and Optics ,High Energy Physics - Experiment ,Nuclear physics ,High Energy Physics - Experiment (hep-ex) ,Reflection (mathematics) ,Antiproton ,Antimatter ,Atomic physics ,Energy (signal processing) - Abstract
We report here experimental evidence of the reflection of a large fraction of a beam of low energy antiprotons by an aluminum wall. This derives from the analysis of a set of annihilations of antiprotons that come to rest in rarefied helium gas after hitting the end wall of the apparatus. A Monte Carlo simulation of the antiproton path in aluminum indicates that the observed reflection occurs primarily via a multiple Rutherford-style scattering on Al nuclei, at least in the energy range 1-10 keV where the phenomenon is most visible in the analyzed data. These results contradict the common belief according to which the interactions between matter and antimatter are dominated by the reciprocally destructive phenomenon of annihilation., 5 pages with 5 figures
- Published
- 2008
46. Antiproton–neon annihilation at 57 MeV/c
- Author
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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
47. Antiproton–helium 3 annihilation at 55 MeV/c
- Author
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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
48. Study of η and η′ production in annihilations
- Author
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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
49. 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
50. Evidence for two pseudoscalar states in the 1.4–1.5 GeV mass region
- Author
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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
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