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11 results on '"M. F. Votruba"'

1. Expansion dynamics of Pb–Pb collisions at 40AGeV/cviewed by negatively charged hadrons

Author

NA57 Collaboration, F Antinori, P Bacon, A Badalà, R Barbera, A Belogianni, I J Bloodworth, M Bombara, G E Bruno, S A Bull, R Caliandro, M Campbell, W Carena, N Carrer, R F Clarke, A Dainese, D Di Bari, S Di Liberto, R Divià, D Elia, D Evans, G A Feofilov, R A Fini, P Ganoti, B Ghidini, G Grella, H Helstrup, K F Hetland, A K Holme, A Jacholkowski, G T Jones, P Jovanovic, A Jusko, R Kamermans, J B Kinson, K Knudson, V Kondratiev, I Králik, A Kravčáková, P Kuijer, V Lenti, R Lietava, G Løvhøiden, V Manzari, M A Mazzoni, F Meddi, A Michalon, M Morando, P I Norman, A Palmeri, G S Pappalardo, B Pastirčák, R J Platt, E Quercigh, F Riggi, D Röhrich, G Romano, R Romita, K Šafařík, L Šándor, E Schillings, G Segato, M Sené, R Sené, W Snoeys, F Soramel, M Spyropoulou-Stassinaki, P Staroba, R Turrisi, T S Tveter, J Urbán, P van de Ven, P Vande Vyvre, A Vascotto, T Vik, O Villalobos Baillie, L Vinogradov, T Virgili, M F Votruba, J Vrláková, P Závada, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and NA57

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), 010308 nuclear & particles physics, Nuclear Theory, Hadron, Dynamics (mechanics), FOS: Physical sciences, 12.38.Mh, 25.75.Nq, 25.75.Ld, 25.75.Dw, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Spectral line, Nuclear physics, Momentum, 0103 physical sciences, Thermal, Transverse mass, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

In this paper we present results on transverse mass spectra and Hanbury-Brown and Twiss correlation functions of negatively charged hadrons, which are expected to be mostly negative pions, measured in Pb-Pb collisions at 40 A GeV/c beam momentum. Based on these data, the collision dynamics and the space-time extent of the system at the thermal freeze-out are studied over a centrality range corresponding to the most central 53% of the Pb--Pb inelastic cross section. Comparisons with freeze-out conditions of strange particles and HBT results from other experiments are discussed., 29 pages, 18 figures

Published
2007
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2. Enhancement of hyperon production at central rapidity in 158AGeV/cPb–Pb collisions

Author

NA57 Collaboration, F Antinori, P Bacon, A Badalà, R Barbera, A Belogianni, W Beusch, I J Bloodworth, M Bombara, G E Bruno, S A Bull, R Caliandro, M Campbell, W Carena, N Carrer, R F Clarke, A Dainese, D Di Bari, S Di Liberto, R Divià, D Elia, D Evans, G A Feofilov, R A Fini, P Ganoti, B Ghidini, G Grella, H Helstrup, K F Hetland, A K Holme, D Huss, A Jacholkowski, G T Jones, P Jovanovic, A Jusko, R Kamermans, J B Kinson, K Knudson, V Kondratiev, I Králik, A Kravčáková, P Kuijer, V Lenti, R Lietava, R A Loconsole, G Løvhøiden, V Manzari, M A Mazzoni, F Meddi, M E Michalon-Mentzer, A Michalon, M Morando, P I Norman, A Palmeri, G S Pappalardo, B Pastirčák, R J Platt, E Quercigh, F Riggi, D Röhrich, G Romano, K Šafařík, L Šándor, E Schillings, G Segato, M Sené, R Sené, W Snoeys, F Soramel, M Spyropoulou-Stassinaki, P Staroba, M Thompson, R Turrisi, T S Tveter, J Urbán, P van de Ven, P Vande Vyvre, A Vascotto, T Vik, O Villalobos Baillie, L Vinogradov, T Virgili, M F Votruba, J Vrláková, P Závada, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and NA57

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Hyperon, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Strangeness, Lambda, 01 natural sciences, Omega, Nuclear physics, 0103 physical sciences, Transverse momentum, Rapidity, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Nucleon, Nuclear Physics
Abstract

Results are presented on hyperon and antihyperon production in Pb-Pb, pPb and pBe collisions at 158 GeV/c per nucleon. Lambda, Xi and Omega yields have been measured at central rapidity and medium transverse momentum as functions of the centrality of the collision. Comparing the yields in Pb-Pb to those in pBe interactions, strangeness enhancement is observed. The enhancement increases with the centrality and with the strangeness content of the hyperons, reaching a factor of about 20 for the Omega in the central Pb-Pb collisions., submitted to J. Phys. G.: Nucl. Part. Phys

Published
2006
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3. A study of the E/f1(1420) and of the f1(1285) in central production

Author

M. F. Votruba

Subjects
Nuclear physics, Physics, Effective mass (solid-state physics), Mass spectrum, Radiative decay, Dalitz plot, Quantum number, Central region, Omega
Abstract

In central production the WA76 experiment, at the CERN Omega Spectrometer, observes the f1(1285) decaying to K0sK±π∓, ηπ+π−, π+π−π+π−, and ρ0γ. The E/f1(1420) is only observed to decay to K*K. A spin‐parity analysis of the K0sK±π∓ system combined with the observation of E/f1(1420)→K0sK0sπ0 determines the quantum numbers of the E/f1(1420) to be IG(JPC)=0+(1++).

Published
1992
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4. Measurement of the ratio of total and differential cross sections on neutrons and protons for charged-current neutrino events

Author

S. Natali, T. Francois, S. J. Sewell, A. M. Cooper, J.G. Guy, M. Calicchio, F. W. Bullock, M. Neveu, T. Azemoon, O. Erriquez, R. Belusevic, F. Romano, W. Venus, Steve O'Neale, M. Tyndel, Jean Sacton, J. P. Baton, D. Bertrand, C. Kochowski, A.G. Michette, J. H. Bartley, G. Gerbier, T.W. Jones, D.H. Davis, V. Brisson, Salvatore Nuzzo, M.T. Fogli-Muciaccia, J. Alitti, M. Iori, M. A. Parker, M. F. Votruba, W. Van Doninck, G. T. Jones, J. Moreels, N. Armenise, Gaston Wilquet, D.C. Colley, P. Petiau, and C. Vander Velde-Wilquet

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Proton, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, High Energy Physics::Phenomenology, Elementary particle, Nuclear physics, Physique des particules élémentaires, Measurements of neutrino speed, High Energy Physics::Experiment, Neutron, Neutrino, Nuclear Experiment, Charged current, Lepton
Abstract

Charged-current neutrino interactions have been analysed in a sample of pictures from BEBC equipped with a TST. Using a method independent of both the neutrino flux and nuclear interaction corrections, the ratio R= σn/σp has been measured. The result is R=1.98±0.19 for the ratio of total cross sections. Bjorken x distributions for proton and neutron targets and for u and d quarks are compared. © 1981., 0, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1981
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5. Dimuon events produced in high energy antineutrino interactions observed in BEBC

Author

D.C. Colley, P. Petiau, M. Tyndel, C. Vander Velde-Wilquet, S. Natali, D. Bertrand, J. H. Bartley, V. Brisson, S. J. Sewell, M. F. Votruba, N. Armenise, T. Francois, W. Van Doninck, L. Kluberg, Jean Sacton, M. Neveu, F. Romano, C. Kochowski, Salvatore Nuzzo, Gaston Wilquet, M. Iori, O. Erriquez, W. Venus, G. T. Jones, A. M. Cooper, M. Calicchio, J.G. Guy, A.G. Michette, Steve O'Neale, R. Belusevic, J. P. Baton, L. Lowe, G. Gerbier, N. J. Baker, M.T. Fogli-Muciaccia, and J. Alitti

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, Hadron, Elementary particle, Nuclear physics, Baryon, Pair production, Antimatter, Physique des particules élémentaires, Nuclear Experiment, Lepton
Abstract

A study is presented of dimuon events from an exposure of BEBC to a wide band ν beam from the CERN SPS. These data double the available statistics on ν induced dilepton events observed in bubble chambers. The relative production rate and V0 yield have been measured and found to agree with previous experiments. The analysis of several kinematical variables shows that the gros features of the data agree with the predictions of the GIM model. Some indication exists that part of the signal could be due to quasi elastic production of the “beautiful baryon”, but the statistical significance is too weak to draw definitive conclusions. © 1980, All rights reserved., 0, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
1980
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6. Production of hyperfragments from the interactions of 3.0 GeV/c and 5.0 GeV/c K− mesons with emulsion nuclei

Author

I. Herynek, M. Suk, A.P. Conway, J. Zakrzewski, V.A. Bull, K. Pniewska, T. P. Shah, T. Pniewski, A. Filipkowski, D. O'Sullivan, M. F. Votruba, R. D. Stanley, A. Montwill, A. Thompson, E.R. Fletcher, P.V. March, Jacques Lemonne, J.E. Allen, Jean Sacton, P. Allen, M. M. Kasim, M. A. Shaukat, Z. Vintr, G. Schorochoff, J. Piekarz, M. Heeran, W. T. Toner, and Dudley Davis

Subjects
Physics, Nuclear physics, Particle physics, Bromine, chemistry, Meson, Emulsion, chemistry.chemical_element, Nuclear emulsion, Nucleon
Abstract

A study has been made of the production of hyperfragments by the interactions of K−-mesons of 3.0 and 5.0 GeV/c momentum in nuclear emulsion. The observed frequencies of production, (3.0±0.1)% and (2.2±0.1)% respectively, are significantly smaller than at lower K−-meson momenta, while the range distributions show a relative increase in the number of hyperfragments of range greater than 5 µm. This increase is attributed to a larger contribution from the fragmentation process, which is especially significant at intermediate ranges [(10÷50) µm], and to greater mean ranges for the heavy hyperfragments, which broaden the peak at short ranges (⩽10 µm). The hyperfragments of range less than 10 µm are mainly heavy residual products of silver and bromine nuclei; their mass numbers differ on the average from those of the parent nuclei by about 30 and 35 nucleon masses for 3.0 and 5.0 GeV/c interactions respectively. Eight examples of π− mesonic decays of heavy hyperfragments, and one probable example of a double hyperfragment, have been observed.

Published
1966
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7. Multiple scattering measurements in nuclear emulsions exposed to momentum-analysed particle beams from the CERN proton synchrotron

Author

M. F. Votruba, A. Hossain, and A. Wataghin

Subjects
Physics, Nuclear and High Energy Physics, Scattering, Proton Synchrotron, Astronomy and Astrophysics, Particle accelerator, Elementary particle, Mott scattering, XX, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, Momentum, law, Particle, Nuclear emulsion, Nuclear Experiment
Abstract

Results of multiple Coulomb scattering measurements on the tracks of high momentum particles in nuclear emulsion are described. It is shown that the method can be used to give reliable momentum estimates, for particles whose tracks are essentially flat in the emulsion, up to 25 GeV/c. Possible deviations from theoretical multiple Coulomb scattering expectations for high cell-sizes are presented.

Published
1961
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8. An effective mass analysis in cosmic ray jets

Author

M. F. Votruba, V. Šimák, and J. Sedlák

Subjects
Nuclear physics, Physics, Thermodynamics of the universe, High energy, Effective mass (solid-state physics), Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, Cosmic ray, Invariant mass, Subatomic particle, Astrophysics, Ultra-high-energy cosmic ray, Spectral line
Abstract

The method of invariant mass spectra of groups of particles, known from the search for multiparticle resonant states in high energy physics, is applied to secondary particles in cosmic ray jets. The results are discussed in connection with the fire-ball model and the H-quanta model for the multiple production of particles in a very high energy region.

Published
1968
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9. Sunti delle comunicazioni presentate al XLVII Congresso della società

Author

E. Abate, G. Bellini, E. Fiorini, S. Ratti, N. Abbattista, A. Minafra, S. Mongelli, A. Romano, P. Waloschek, M. Ageno, C. Felici, A. Agodi, R. Giordano, J. Alitti, V. Alles-Borelli, J. P. Baton, A. Berthelot, U. Bidan, A. Daudin, B. Deler, O. Goussu, M. A. Jabiol, F. Lévy, C. Lewin, M. Neveu-René, A. Rogozinski, F. Shively, J. Laberrigue-Frolow, O. Ouannès, M. Sené, L. Vigneron, E. Benedetti, J. Litvak, G. Puppi, M. Whitehead, J. E. Allen, C. Bartoli, B. Brunelli, J. A. Nation, B. Rumi, R. Toschi, A. Boschi, F. Magistrelli, J. B. Allen, C. Coville, M. U. Martone, S. E. Segre, U. Amaldi, V. T. Cocconi, T. Fazzini, G. Fidecaro, C. Gesquière, M. Legros, H. Steiner, G. Andreassi, P. Budini, G. Calucci, G. Furlan, G. Peressutti, P. Cazzola, I. Archetti, D. Steve Bocciarelli, P. E. Argan, G. Bendiscioli, G. Ciocchetti, I. Ferrero, A. Gigli, A. Piazzoli, E. Picasso, G. Piragino, G. Ascarelli, S. Rodriguez, A. Ascenzi, E. Bonucci, C. François, A. Ascoli, Z. A. Fuhrman, U. Ascoli-Bartoli, A. De Angelis, S. Martellucci, M. Asdente, J. Friedel, B. Aubert, V. Brisson, J. Hennessy, P. Mittner, J. Six, C. Baglin, M. Bloch, A. Bressy, A. Lagarrigue, A. Orkin-Lecourtois, P. Rançon, A. Rousset, X. Sauteron, P. L. Auer, S. Aurisicchio, C. Frontali, F. Graziosi, G. Toschi, F. Bachelet, P. Balata, N. Lucci, F. Baldassarre, A. Caforio, A. Ferilli, D. Ferraro, M. Merlin, S. Semeraro, C. M. Fisher, W. M. Gibson, A. Mason, W. Venus, D. Evans, A. Hossain, W. O. Lock, M. F. Votruba, A. Wataghin, M. M. Kasim, M. A. Shaukat, A. Fedrighini, A. J. Herz, A. E. Sichirollo, L. Tallone, G. Vegni, A. Balzarotti, G. Chiarotti, A. Frova, F. Baracchi, R. Perilli-Fedeli, M. Pierucci, G. Saltini, G. Barbiellini, G. Bologna, G. Diambrini, G. P. Murtas, A. Barone, G. Baroni, R. Bizzarri, P. Guidoni, A. Manfredini, A. Stajano, G. Brautti, M. Ceschia, L. Chersovani, M. Sessa, M. Bassetti, A. Pompei, P. Bassi, G. Bertolini, F. Cappellani, B. Ferretti, G. B. Restelli, A. Rota, G. Venturini, A. Battaglia, M. Iannuzzi, E. Polacco, G. Degli Antoni, P. Negri, W. B. Fretter, T. F. Hoang, H. Bingham, D. Drijard, B. De Raad, R. Salmeron, R. Voss, M. Cresti, S. Limentani, R. Santangelo, G. Boreani, I. Perrero, C. M. Garelli, A. Lagar-Rigue, E. G. Beltrametti, M. Beltrami, M. Colombo, R. Fieschi, K. Berkelman, G. Cortellessa, A. Reale, A. Bernè, G. Boato, M. De Paz, M. Bertolotti, V. Grasso, T. Papa, D. Sette, C. Bertoluzza, A. Bisi, A. Fasana, E. Gatti, L. Zappa, G. Casanova, A. C. Levi, G. Bonazzola, O. A. Borello, S. Costa, S. Ferroni, G. Bonera, F. Borsa, P. De Stefano, A. Rigamionti, A. Rigamonti, P. G. Bordoni, P. E. Giua, L. Palmieri, M. Verani-Borgucci, M. Nuovo, L. Verdini, F. Ferrero, R. Malvano, A. Molinari, G. Borgonovi, G. Caglioti, F. P. Ricci, A. Santoro, V. Scatturin, M. V. Bortolani, L. Lendinara, L. Monari, A. Braccesi, M. Ceccarelli, T. Weber, G. Buttino, A. Cecchetti, A. Drigo, E. R. Caianiello, M. Marinaro, B. Preziosi, P. Caldirola, O. De Baebieri, G. Calvi, R. Parisi, A. Rubbino, P. Camagni, A. Manara, A. Caimpolattaro, G. Campos Venuti, G. Matthiae, E. Canobbio, R. Cappelletti, L. Dalla Croce, G. Careri, S. Cunsolo, P. Mazzoldi, N. Carrara, P. F. Checcacci, L. Ronchi, R. Carrara, A. Grigoletto, A. Loria, L. Peruzzo, D. Venchiarutti, A. Carrelli, E. Grossetti, L. Pauciulo, A. Carreli, E. Tartaglione, G. Brescia, F. Porreca, F. Cattaneo, E. Germagnoli, A. Cavaliere, S. Cavallaro, R. Potenza, R. Ricamo, G. Cavalleri, G. Redaelli, R. Giovanellt, S. Ceresara, T. Federigih, C. Cernigoi, I. Gabrielli, G. Iernetti, C. Villi, C. B. Chadwick, W. T. Davies, M. Derrick, J. H. Mulvey, D. Radojicic, C. A. Wilkinson, G. Nardelli, A. Chiozzotto, F. Valente, N. H. Lipman, A. W. Merrison, L. Colli, G. Bassani, P. G. Sona, F. Cristofori, M. O. Franceschetti, I. Iori, G. Krzuk, M. Mangialajo, F. Marcelja, F. Merzari, G. Conforto, M. Conversi, L. Di Lella, G. Penso, M. Toller, C. Rubbia, L. di Lella, G. Contursi, A. Pozzi, P. Salvadori, E. Crosignani, P. Franzosini, G. Siragusa, L. Zanotti, M. Cutolo, P. Cuzzocrea, R. A. Ricci, G. B. Vingiani, G. Da Prato, G. B. Debiasi, G. Rostagni, H. De Carvalho, A. Celano, G. Cortini, E. Del Giudice, G. Potenza, R. Rinzivillo, G. Ghigo, H. G. de Carvalho, M. Muchnik, M. Severi, J. Combe, K. Goebel, A. Manfeedini, G. Vanderhaeghe, R. Bösch, J. Lang, R. Müller, W. Wölfli, H. G. de Carvaiho, F. Salvetti, E. Sassi, G. Boella, C. Cantù, F. Della Valle, L. Frontali, P. Orlando, G. Tecce, S. Delli Santi, G. Mannino, G. Setti, F. Demanins, G. Pisent, G. Poiani, F. De Martini, A. Desalvo, P. Gondi, F. A. Levi, F. Zignani, B. De Tollis, A. Verganelakis, M. Di Corato, E. S. Geisema, A. Minguzzi-Ranzi, J. Belltère, H. H. Bingham, M. Garelli, M. Vigone, P. Waldner, B. de Raad, V. Emma, C. Milone, S. Iannelli, F. Mezzanares, E. Erra, E. Saetta Menichella, U. Facchini, F. Erdas, G. von Gehlen, G. Fabri, F. Fabiani, M. Fidecaro, G. Finocchiaro, G. Giacomelli, D. Harting, G. Torelli, G. Gatti, W. C. Middelkoop, T. Yamagata, G. Spinolo, L. Freindl, H. Niewodniczański, J. Nurzyński, M. Slapa, A. Strzalkowski, M. T. Mangiantini, E. Galzenati, M. Pusterla, F. Gasparini, V. Svelto, C. Tamburello, D. Gellt, D. Gelli, T. Federighi, A. Grilli, D. Noblli, G. W. Greenlees, K. A. Grotowski, A. B. Robbins, M. Grimaldi, F. M. Votruba, P. Principi, T. Rossini, J. G. Linhart, H. Knoepfel, C. Gourlan, R. S. Liotta, A. Luccio, G. Pavanati, F. Resmini, C. Rosatelli, C. Succi, G. Tagliaferri, F. Resmimi, Ch. Maisonnier, M. Haegi, M. Omini, M. G. Marcazzan, F. Tonolini, G. Martelli, K. Chapman, W. Galbraith, H. B. van der Raay, D. H. Reading, R. Rubinstein, G. Marx, G. Missiroli, U. Valdrè, G. Missoni, J. W. Motz, D. Monti, G. Quareni, A. Quareni Vignudelli, K. Gottntein, W. Püschel, J. Tietge, R. Morchio, A. Borsellino, S. Notarrigo, M. Paić, B. Antolković, P. Tomaš, M. Turk, A. Paoletti, G. Pappalardo, D. Vinciguerra, V. Pelosi, G. Tomasini, G. Dascola, A. Gainotti, C. Lamborizio, R. Pratesi, A. M. Scheggi, G. Toraldo di Francia, T. F. Quercia, E. Turrisi, M. Jean, R. Van Lieshout, S. Monaro, G. Chilosi, B. Van Nooyen, A. Sargentini, F. Sgarlata, F. Wanderlingh, J. P. Somon, F. Waldner, G. Zin, and F. Vinci

Subjects
Nuclear and High Energy Physics, Materials science, Astronomy and Astrophysics, Humanities, Atomic and Molecular Physics, and Optics
Published
1962
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10. Coherent production of pions by high-energy pions on complex nuclei

Author

D. Evans, M. S. Shaukat, A. Hossain, A. J. Herz, A. Mason, D. Ferraro, G. Vegni, M. F. Votruba, C. M. Fisher, M. M. Kasim, A. Caforio, A. E. Sichirollo, S. Semeraro, W. Venus, and A. Wataghin

Subjects
Physics, Diffraction, Nuclear and High Energy Physics, Mean free path, Nuclear Theory, Momentum transfer, Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Dissociation (chemistry), Nuclear physics, medicine.anatomical_structure, Pion, medicine, Nuclear emulsion, Atomic physics, Nuclear Experiment, Nucleus, Radioactive decay
Abstract

A search was made in nuclear emulsion for examples of coherent multiple production of pions by diffraction dissociation and Coulomb dissociation. The primary particles were negative pions of 14, 16.2 and 17 GeV/c, and the total track length examined was 971.8 m. Events in which there were three fast charged secondaries and no evidence of disintegration or radioactive decay of the target nucleus were found to contain a large proportion of possible examples of coherent production. This conclusion could be reached without the use of measurements of the momenta of the secondaries. A more detailed analysis was carried out with the aid of the results of momentum determinations, and this led to an estimate of the mean free path of (51−11+18) metres of emulsion for the coherent reaction π−+nucleus→π−+π−+π++ nucleus. An analysis of the distributions of momentum transfer to the target nucleus, as well as a comparison with the results of the bubble-chamber work, provide strong indications that all the complex nuclei in the emulsion act as targets in this reaction, and the results are fully consistent with the hypothesis that diffraction dissociation is the dominant mechanism.

Published
1964
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11. On the behaviour of the multiple scattering constant,K, for nuclear emulsions, at large cell sizes

Author

M. F. Votruba, A. Hossain, D. Evans, and A. Wataghin

Subjects
Nuclear and High Energy Physics, Muon, Materials science, Pion, Scattering, Binding energy, Particle, Astronomy and Astrophysics, Expected value, Atomic physics, Constant (mathematics), Electric charge, Atomic and Molecular Physics, and Optics
Abstract

Previous resuIts from multiple scattering measurements of high-energy particle tracks in nuclear emulsions indicate a possible discrepancy between theoretically expected values of the mean scattering angle and that found experimentally at cell sizes greater than 1 cm. Further evidence is presented; tracks produced by l6.2-Bev/c pi - and 8.2Bev/c mu - are analyzed. The value of the scattering constant needed to fit the data, for cell sizes greater than l cm is calculated. The unimportance of the nuclear-force contribution and an extended charge for the nucleus are suggested. (L.N.N.)

Published
1961
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