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6. Unicompartmental knee replacement combined with anterior cruciate ligament reconstruction provides comparable results to total knee replacement with no increased risk of complications

Author

Legnani Claudio, Borgo Enrico, Macchi Vittorio, Terzaghi Clara, and Ventura Alberto

Subjects
unicompartmental knee replacement, anterior cruciate ligament, acl reconstruction, total knee replacement, Orthopedic surgery, RD701-811
Abstract

Introduction: There is controversy about the management of unicompartmental knee osteoarthritis (OA) in young, active patients with anterior cruciate ligament (ACL) insufficiency. This study compares the subjective, radiological, and functional results of total knee replacement (TKR) vs. combined medial unicompartmental knee replacement (UKR) with ACL reconstruction. Method: Twelve patients suffering from medial OA and ACL deficiency with varus knee deformity and/or tibial slope

Published
2024
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11. Fission induced by nucleons at intermediate energies

Author

Meo, Sergio Lo, Mancusi, Davide, Massimi, Cristian, Vannini, Gianni, and Ventura, Alberto

Subjects
Nuclear Theory
Abstract

Monte Carlo calculations of fission of actinides and pre-actinides induced by protons and neutrons in the energy range from 100 MeV to 1 GeV are carried out by means of a recent version of the Li\`ege Intranuclear Cascade Model, INCL++, coupled with two different evaporation-fission codes, GEMINI++ and ABLA07. In order to reproduce experimental fission cross sections, model parameters are usually adjusted on available (p,f) cross sections and used to predict (n,f) cross sections for the same isotopes., Comment: 36 pages, 18 figures, to appear in Nuclear Physics A

Published
2014
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14. Measurement of the 235U(n,f) cross section relative to the 10B(n,α) reaction with Micromegas detectors at the CERN n_TOF facility: First results

Author

Michalopoulou Veatriki, Diakaki Maria, Vlastou Rosa, Kokkoris Michael, Stamatopoulos Athanasios, Tsinganis Andrea, Eleme Zinovia, Patronis Nikolas, Heyse Jan, Schillebeeckx Peter, Tassan-Got Laurent, Barbagallo Massimo, Colonna Nicola, Urlass Sebastian, Macina Daniela, Chiaveri Enrico, Aberle Oliver, Alcayne Victor, Amaducci Simone, Andrzejewski Józef, Audouin Laurent, Babiano-Suarez Victor, Bacak Michael, Bennett Samuel, Berthoumieux Eric, Billowes Jon, Bosnar Damir, Brown Adam, Busso Maurizio, Caamaño Manuel, Caballero-Ontanaya Luis, Calviño Francisco, Calviani Marco, Cano-Ott Daniel, Casanovas Adria, Cerutti Francesco, Cortés Guillem, Cortés-Giraldo Miguel, Cosentino Luigi, Cristallo Sergio, Damone Lucia-Anna, Davies Paul-John, Dietz Mirco, Domingo-Pardo César, Dressler Rugard, Ducasse Quentin, Dupont Emmeric, Durán Ignacio, Fernández-Domínguez Beatriz, Ferrari Alfredo, Finocchiaro Paolo, Göbel Kathrin, Garg Ruchi, Gawlik-Ramięga Aleksandra, Gilardoni Simone, Gonçalves Isabel, González-Romero Enrique, Guerrero Carlos, Gunsing Frank, Harada Hideo, Heinitz Stephan, Jenkins David, Junghans Arnd, Käppeler† Franz, Kadi Yacine, Kimura Atsushi, Knapová Ingrid, Krtička Milan, Kurtulgil Deniz, Ladarescu Ion, Lederer-Woods Claudia, Leeb Helmut, Lerendegui-Marco Jorge, Lonsdale Sarah-Jane, Manna Alice, Martínez Trinitario, Masi Alessandro, Massimi Cristian, Mastinu Pierfrancesco, Mastromarco Mario, Maugeri Emilio-Andrea, Mazzone Annamaria, Mendoza Emilio, Mengoni Alberto, Milazzo Paolo, Mingrone Federica, Moreno-Soto Javier, Musumarra Agatino, Negret Alexandru, Nolte Ralf, Ogállar Francisco, Oprea Andreea, Pavlik Andreas, Perkowski Jarosław, Piersanti Luciano, Petrone Cristina, Pirovano Elisa, Porras Ignacio, Praena Javier, Quesada José-Manuel, Ramos-Doval Diego, Rauscher Thomas, Reifarth René, Rochman Dimitri, Rubbia Carlo, Sabaté-Gilarte Marta, Saxena Alok, Schumann Dorothea, Sekhar Adhitya, Smith Gavin, Sosnin Nikolay, Sprung Peter, Tagliente Giuseppe, Tain José, Tarifeño-Saldivia Ariel, Thomas Benedikt, Torres-Sánchez Pablo, Ulrich Jiri, Valenta Stanislav, Vannini Gianni, Variale Vincenzo, Vaz Pedro, Ventura Alberto, Vescovi Diego, Vlachoudis Vasilis, Wallner Anton, Woods Philip-John, Wright Tobias, and Žugec Petar

Subjects
Physics, QC1-999
Abstract

Neutron cross section measurements are often made relative to a neutron cross section standard. Thus, the accuracy of the neutron standards determines the best possible accuracy of the neutron measurements. The 235U(n,f) cross section is widely used as reference, while it is considered a standard at thermal point and between 0.15 to 200 MeV. For this reason, additional cross section data for the 235U(n,f) reaction are useful in order to improve the accuracy and to extend the energy range of the standard. In this work, preliminary results of the measurement of the 235U(n,f) cross-section relative to the standard 10B(n,a) reaction are presented. The high accuracy measurement was performed at the experimental area EAR-1 of the n_TOF facility at CERN, aiming at covering the energy range from the thermal region up to approximately 100 keV. The samples were produced at JRC-Geel in Belgium, while the experimental setup was based on Micromegas detectors.

Published
2023
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15. Group-theoretical approach to a non-central extension of the Kepler-Coulomb problem

Author

Kerimov, Gul-Mirza and Ventura, Alberto

Subjects
Mathematical Physics
Abstract

Bound and scattering states of a non-central extension of the three-dimensional Kepler-Coulomb Hamiltonian are worked out analytically within the framework of the potential groups of the problem, SO(7) for bound states and SO(6,1) for scattering states. In the latter case, the S matrix is calculated by the method of intertwining operators., Comment: 12 pages, to appear in J. Phys. A : Math. Theor

Published
2010
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16. Reflectionless PT-symmetric potentials in the one-dimensional Dirac equation

Author

Cannata, Francesco and Ventura, Alberto

Subjects
Mathematical Physics
Abstract

We study the one-dimensional Dirac equation with local PT-symmetric potentials whose discrete eigenfunctions and continuum asymptotic eigenfunctions are eigenfunctions of the PT operator, too: on these conditions the bound-state spectra are real and the potentials are reflectionless and conserve unitarity in the scattering process. Absence of reflection makes it meaningful to consider also PT-symmetric potentials that do not vanish asymptotically., Comment: 24 pages, to appear in J. Phys. A : Math. Theor; one acknowledgement and one reference added

Published
2010
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18. Non-local PT-symmetric potentials in the one-dimensional Dirac equation

Author

Cannata, Francesco and Ventura, Alberto

Subjects
Quantum Physics
Abstract

The Dirac equation in (1+1) dimensions with a non-local PT-symmetric potential of separable type is studied by means of the Green function method: properties of bound and scattering states are derived in full detail and numerical results are shown for a potential kernel of Yamaguchi type, inspired by the treatment of low-energy nucleon-nucleon interaction., Comment: 30 pages, 3 figures, to appear in J. Phys. A: Math. Theor

Published
2008
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19. Overcritical PT-symmetric square well potential in the Dirac equation

Author

Cannata, Francesco and Ventura, Alberto

Subjects
Quantum Physics
Abstract

We study scattering properties of a PT-symmetric square well potential with real depth larger than the threshold of particle-antiparticle pair production as the time component of a vector potential in the (1+1)-dimensional Dirac equation., Comment: 11 pages, 1 figure, to appear in Physics Letters A

Published
2007
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20. Scattering by PT-symmetric non-local potentials

Author

Cannata, Francesco and Ventura, Alberto

Subjects
Quantum Physics
Abstract

A general formalism is worked out for the description of one-dimensional scattering by non-local separable potentials and constraints on transmission and reflection coefficients are derived in the cases of P, T, or PT invariance of the Hamiltonian. The case of a solvable Yamaguchi potential is discussed in detail., Comment: 11 pages

Published
2006
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21. Construction of PT-asymmetric non-Hermitian Hamiltonians with CPT-symmetry

Author

Caliceti, Emanuela, Cannata, Francesco, Znojil, Miloslav, and Ventura, Alberto

Subjects
Mathematical Physics, 46C50, 81Q60, 81P10, 81S99, 81Q05
Abstract

Within CPT-symmetric quantum mechanics the most elementary differential form of the charge operator C is assumed. A closed-form integrability of the related coupled differential self-consistency conditions and a natural embedding of the Hamiltonians in a supersymmetric scheme is achieved. For a particular choice of the interactions the rigorous mathematical consistency of the construction is scrutinized suggesting that quantum systems with non-self-adjoint Hamiltonians may admit probabilistic interpretation even in presence of a manifest breakdown of both T symmetry (i.e., Hermiticity) and PT symmetry., Comment: 13 pages

Published
2004
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26. Measurement of the neutron-induced fission cross section of Th 230 at the CERN n_TOF facility

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Michalopoulou, Veatriki, Stamatopoulos, A., Diakaki, Maria, Tsinganis, Andrea, Vlastou, Roza, Kokkoris, M., Patronis, N., Eleme, Zinovia, Macina, Daniela, Tassan Got, Laurence, Colonna, Nicola, Chiaveri, E., Ventura, Alberto, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Michalopoulou, Veatriki, Stamatopoulos, A., Diakaki, Maria, Tsinganis, Andrea, Vlastou, Roza, Kokkoris, M., Patronis, N., Eleme, Zinovia, Macina, Daniela, Tassan Got, Laurence, Colonna, Nicola, Chiaveri, E., Ventura, Alberto, Calviño Tavares, Francisco, Casanovas Hoste, Adrià, Cortés Rossell, Guillem Pere, and Tarifeño Saldivia, Ariel Esteban

Abstract

The neutron-induced fission cross section of 230 Th has been measured at the neutron time-of-flight facility n_TOF located at CERN. The experiment was performed at the experimental area EAR-1 with a neutron flight path of 185 m, using Micromegas detectors for the detection of the fission fragments. The 230 Th(n, f ) cross section was determined relative to the 235 U(n, f ) one, covering the energy range from the fission threshold up to 400 MeV. The results from the present work are compared with existing cross-section datasets and the observed discrepancies are discussed and analyzed. Finally, using the code EMPIRE 3.2.3 a theoretical study, based on the statistical model, was performed leading to a satisfactory reproduction of the experimental results with the proper tuning of the respective parameters, while for incident neutron energy beyond 200 MeV the fission of 230 Th was described by Monte Carlo simulations., This project received funding from the Euratom “Support safe operation of nuclear systems” program 2014–2018 under Grant Agreement No. 847552 (SANDA) and by the funding agencies of the participating institutes. This research is imple- mented through the IKY scholarships program and cofinanced by the European Union (European Social Fund ’ESF) and Greek national funds through the action entitled “Reinforce- ment of Postdoctoral Researchers - 2nd call (MIS 5033021)”, in the framework of the Operational Programme “Human Resources Development Program, Education and Lifelong Learning” of the National Strategic Reference Framework., Article signat per 137 autors/es: V. Michalopoulou, A. Stamatopoulos, M. Diakaki, A. Tsinganis, R. Vlastou, M. Kokkoris, N. Patronis, Z. Eleme, D. Macina, L. Tassan-Got, N. Colonna, E. Chiaveri, A. Ventura, P. Schillebeeckx, J. Heyse, G. Sibbens, G. Alaerts, A. Borella, A. Moens, D. Vanleeuw, O. Aberle, V. Alcayne, S. Amaducci, J. Andrzejewski, L. Audouin, V. Babiano-Suarez, M. Bacak, M. Barbagallo, S. Bennett, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Busso, M. Caamaño, L. Caballero, F. Calviño, M. Calviani, D. Cano-Ott, A. Casanovas, F. Cerutti, G. Cortés, M. A. Cortés-Giraldo, L. Cosentino, S. Cristallo, L. A. Damone, P. J. Davies, M. Dietz, C. Domingo-Pardo, R. Dressler, Q. Ducasse, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Finocchiaro, V. Furman, K. Göbel, R. Garg, A. Gawlik-Ramiega, S. Gilardoni, I. F. Gonçalves, E. González-Romero, C. Guerrero, F. Gunsing, H. Harada, S. Heinitz, D. G. Jenkins, A. Junghans, F. Käppeler, Y. Kadi, A. Kimura, I. Knapová, Y. Kopatch, M. Krticka, D. Kurtulgil, I. Ladarescu, C. Lederer-Woods, H. Leeb, J. Lerendegui-Marco, S. J. Lonsdale, A. Manna, T. Martínez, A. Masi, C. Massimi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, J. Moreno-Soto, A. Musumarra, A. Negret, R. Nolte, F. Ogállar, A. Oprea, A. Pavlik, J. Perkowski, C. Petrone, L. Piersanti, E. Pirovano, I. Porras, J. Praena, J. M. Quesada, D. Ramos-Doval, T. Rauscher, R. Reifarth, D. Rochman, Y. Romanets, C. Rubbia, M. Sabaté-Gilarte, A. Saxena, D. Schumann, A. Sekhar, A. G. Smith, N. V. Sosnin, P. Sprung, G. Tagliente, J. L. Tain, A. Tarifeño-Saldivia, Th. Thomas, P. Torres-Sánchez, J. Ulrich, S. Urlass, S. Valenta, G. Vannini, V. Variale, P. Vaz, D. Vescovi, V. Vlachoudis, A. Wallner, P. J. Woods, T. Wright, and P. Žugec., Postprint (published version)

Published
2023

27. Neutron-induced fission cross sections of Th 232 and U 233 up to 1 GeV using parallel plate avalanche counters at the CERN n_TOF facility

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tarrío, Diego, Tassan Got, Laurence, Durán, I., Leong, L.S., Paradela Dobarro, Carlos, Audouin, Ludmila, Leal-Cidoncha, E., Le Naour, Claire, Caamaño Fresco, Manuel, Ventura, Alberto, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Bécares, Vicente, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, Riego Pérez, Albert, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Tarrío, Diego, Tassan Got, Laurence, Durán, I., Leong, L.S., Paradela Dobarro, Carlos, Audouin, Ludmila, Leal-Cidoncha, E., Le Naour, Claire, Caamaño Fresco, Manuel, Ventura, Alberto, Altstadt, Sebastian, Andrzejewski, Józef, Barbagallo, Massimo, Bécares, Vicente, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Gómez Hornillos, María Belén, and Riego Pérez, Albert

Abstract

The neutron-induced fission cross sections of 232 Th and 233 U were measured relative to 235 U in a wide neutron energy range up to 1 GeV (and from fission threshold in the case of 232 Th , and from 0.7 eV in case of 233 U ), using the white-spectrum neutron source at the CERN Neutron Time-of-Flight (n_TOF) facility. Parallel plate avalanche counters (PPACs) were used, installed at the Experimental Area 1 (EAR1), which is located at 185 m from the neutron spallation target. The anisotropic emission of fission fragments were taken into account in the detection efficiency by using, in the case of 233 U , previous results available in EXFOR, whereas in the case of 232 Th these data were obtained from our measurement, using PPACs and targets tilted 45 ° with respect to the neutron beam direction. Finally, the obtained results are compared with past measurements and major evaluated nuclear data libraries. Calculations using the high-energy reaction models INCL + + and ABLA07 were performed and some of their parameters were modified to reproduce the experimental results. At high energies, where no other neutron data exist, our results are compared with experimental data on proton-induced fission. Moreover, the dependence of the fission cross section at 1 GeV with the fissility parameter of the target nucleus is studied by combining those ( p , f ) data with our ( n , f ) data on 232 Th and 233 U and on other isotopes studied earlier at n_TOF using the same experimental setup., Peer Reviewed, Article escrit per 81 autors/autores: D. Tarrío , L. Tassan-Got, I. Duran, L. S. Leong, C. Paradela, L. Audouin, E. Leal-Cidoncha, C. Le Naour, M. Caamaño, A. Ventura, S. Altstadt, J. Andrzejewski, M. Barbagallo, V. Bécares, F. Becvá ˇ ˇr,F. Belloni, E. Berthoumieux, J. Billowes, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calviño, D. Cano-Ott, C. Carrapiço, F. Cerutti, E. Chiaveri,M. Chin, N. Colonna, G. Cortés, M. A. Cortés-Giraldo, M. Diakaki, C. Domingo-Pardo, N. Dzysiuk, C. Eleftheriadis, A. Ferrari, K. Fraval, S. Ganesan, A. R. García, G. Giubrone, M. B. Gómez-Hornillos, I. F. Gonçalves, E. González-Romero,E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, D. G. Jenkins, E. Jericha, Y. Kadi, F. Käppeler,† D. Karadimos, P. Koehler, M. Kokkoris, M. Krticka, J. Kroll, C. Langer, C. Lederer, H. Leeb, R. Losito, A. Manousos, J. Marganiec, T. Martínez, C. Massimi, P. F. Mastinu,M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea,,† W. Mondalaers, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, M. S. Robles, F. Roman, C. Rubbia, R. Sarmento, P. Schillebeeckx,S. Schmidt, G. Tagliente, J. L. Tain, A. Tsinganis, S. Valenta, G. Vannini, V. Variale, P. Vaz, R. Versaci, M. J. Vermeulen, V. Vlachoudis, R. Vlastou,A. Wallner, T. Ware, M. Weigand, C. Weiß, T. J. Wright, P. Žugec, Postprint (published version)

Published
2023

30. sj-pdf-1-imr-10.1177_03000605231182668 - Supplemental material for Arthroscopically-assisted retrieval of a fractured polyethylene Oxford knee meniscal bearing: a case report

Author

Ventura, Alberto, Borgo, Enrico, and Legnani, Claudio

Subjects
Oncology and Carcinogenesis not elsewhere classified, Psychiatry (incl. Psychotherapy), Nursing not elsewhere classified, Neurology and Neuromuscular Diseases, FOS: Clinical medicine, Cardiology, Respiratory Diseases, Public Health and Health Services not elsewhere classified, Paediatrics, Pharmacology and Pharmaceutical Sciences not elsewhere classified, Orthopaedics, Dentistry not elsewhere classified, Nutrition and Dietetics not elsewhere classified, Sports Medicine, Health and Community Services, Endocrinology, Aged Health Care, Otorhinolaryngology, Emergency Medicine, Surgery, Geriatrics and Gerontology, Psychology not elsewhere classified, Sociological Methodology and Research Methods
Abstract

Supplemental material, sj-pdf-1-imr-10.1177_03000605231182668 for Arthroscopically-assisted retrieval of a fractured polyethylene Oxford knee meniscal bearing: a case report by Alberto Ventura, Enrico Borgo and Claudio Legnani in Journal of International Medical Research

Published
2023
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31. Measurement of the <math><mrow><mmultiscripts><mi mathvariant='normal'>N</mi><mprescripts/><none/><mn>14</mn></mmultiscripts><mo>(</mo><mi>n</mi><mo>,</mo><mi>p</mi><mo>)</mo><mmultiscripts><mi mathvariant='normal'>C</mi><mprescripts/><none/><mn>14</mn></mmultiscripts></mrow></math> cross section at the CERN n_TOF facility from subthermal energy to 800 keV

Author

Torres-Sánchez, Pablo, Praena, Javier, Porras, Ignacio, Sabaté-Gilarte, Marta, Lederer-Woods, Claudia, Aberle, Oliver, Alcayne, Victor, Amaducci, Simone, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Babiano-Suarez, Victor, Bacak, Michael, Barbagallo, Massimo, Bečvář, František, Bellia, Giorgio, Berthoumieux, Eric, Billowes, Jon, Bosnar, Damir, Brown, Adam, Busso, Maurizio, Caamaño, Manuel, Caballero, Luis, Calviño, Francisco, Calviani, Marco, Cano-Ott, Daniel, Casanovas, Adria, Cerutti, Francesco, Chen, Yonghao, Chiaveri, Enrico, Colonna, Nicola, Cortés, Guillem, Cortés-Giraldo, Miguel, Cosentino, Luigi, Cristallo, Sergio, Damone, Lucia-Anna, Diakaki, Maria, Dietz, Mirco, Domingo-Pardo, César, Dressler, Rugard, Dupont, Emmeric, Durán, Ignacio, Eleme, Zinovia, Fernández-Domínguez, Beatriz, Ferrari, Alfredo, Ferrer, Francisco Javier, Finocchiaro, Paolo, Furman, Valter, Göbel, Kathrin, Garg, Ruchi, Gawlik-Ramięga, Aleksandra, Geslot, Benoit, Gilardoni, Simone, Glodariu, Tudor, Gonçalves, Isabel, González-Romero, Enrique, Guerrero, Carlos, Gunsing, Frank, Harada, Hideo, Heinitz, Stephan, Heyse, Jan, Jenkins, David, Jericha, Erwin, Käppeler, Franz, Kadi, Yacine, Kimura, Atsushi, Kivel, Niko, Kokkoris, Michael, Kopatch, Yury, Krtička, Milan, Kurtulgil, Deniz, Ladarescu, Ion, Leeb, Helmut, Lerendegui-Marco, Jorge, Meo, Sergio Lo, Lonsdale, Sarah-Jane, Macina, Daniela, Manna, Alice, Martínez, Trinitario, Masi, Alessandro, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Matteucci, Francesca, Maugeri, Emilio-Andrea, Mazzone, Annamaria, Mendoza, Emilio, Mengoni, Alberto, Michalopoulou, Veatriki, Milazzo, Paolo Maria, Mingrone, Federica, Musumarra, Agatino, Negret, Alexandru, Nolte, Ralf, Ogállar, Francisco, Oprea, Andreea, Patronis, Nikolas, Pavlik, Andreas, Perkowski, Jarosław, Persanti, Luciano, Quesada, José-Manuel, Radeck, Désirée, Ramos-Doval, Diego, Rauscher, Thomas, Reifarth, René, Rochman, Dimitri, Rubbia, Carlo, Saxena, Alok, Schillebeeckx, Peter, Schumann, Dorothea, Smith, Gavin, Sosnin, Nikolay, Stamatopoulos, Athanasios, Tagliente, Giuseppe, Tain, José, Talip, Zeynep, Tarifeño-Saldivia, Ariel, Tassan-Got, Laurent, Tsinganis, Andrea, Ulrich, Jiri, Urlass, Sebastian, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Woods, Philip John, Wright, Tobias, Žugec, Petar, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and n_TOF

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Background: The N14(n,p)C14 reaction is of interest in neutron capture therapy, where nitrogen-related dose is the main component due to low-energy neutrons, and in astrophysics, where N14 acts as a neutron poison in the s process. Several discrepancies remain between the existing data obtained in partial energy ranges: thermal energy, keV region, and resonance region.Purpose: We aim to measure the N14(n,p)C14 cross section from thermal to the resonance region in a single measurement for the first time, including characterization of the first resonances, and provide calculations of Maxwellian averaged cross sections (MACS).Method: We apply the time-of-flight technique at Experimental Area 2 (EAR-2) of the neutron time-of-flight (n_TOF) facility at CERN. B10(n,α)Li7 and U235(n,f) reactions are used as references. Two detection systems are run simultaneously, one on beam and another off beam. Resonances are described with the R-matrix code sammy.Results: The cross section was measured from subthermal energy to 800 keV, resolving the first two resonances (at 492.7 and 644 keV). A thermal cross section was obtained (1.809±0.045 b) that is lower than the two most recent measurements by slightly more than one standard deviation, but in line with the ENDF/B-VIII.0 and JEFF-3.3 evaluations. A 1/v energy dependence of the cross section was confirmed up to tens of keV neutron energy. The low energy tail of the first resonance at 492.7 keV is lower than suggested by evaluated values, while the overall resonance strength agrees with evaluations.Conclusions: Our measurement has allowed determination of the N14(n,p) cross section over a wide energy range for the first time. We have obtained cross sections with high accuracy (2.5%) from subthermal energy to 800 keV and used these data to calculate the MACS for kT=5 to kT=100 keV.

Published
2023
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44. Measurement of the $^{14}$N(n,p)$^{14}$C cross section at the CERN n_TOF facility from sub-thermal energy to 800 keV

Author

Torres-Sánchez, Pablo, Praena, Javier, Porras, Ignacio, Sabaté-Gilarte, Marta, Lederer-Woods, Claudia, Aberle, Oliver, Alcayne, Victor, Amaducci, Simone, Andrzejewski, Józef, Audouin, Laurent, Bécares, Vicente, Babiano-Suarez, Victor, Bacak, Michael, Barbagallo, Massimo, Bečvář, František, Bellia, Giorgio, Berthoumieux, Eric, Billowes, Jon, Bosnar, Damir, Brown, Adam, Busso, Maurizio, Caamaño, Manuel, Caballero, Luis, Calviño, Francisco, Calviani, Marco, Cano-Ott, Daniel, Casanovas, Adria, Cerutti, Francesco, Chen, Yonghao, Chiaveri, Enrico, Colonna, Nicola, Cortés, Guillem, Cortés-Giraldo, Miguel, Cosentino, Luigi, Cristallo, Sergio, Damone, Lucia-Anna, Diakaki, Maria, Dietz, Mirco, Domingo-Pardo, César, Dressler, Rugard, Dupont, Emmeric, Durán, Ignacio, Eleme, Zinovia, Fernández-Domínguez, Beatriz, Ferrari, Alfredo, Ferrer, Francisco Javier, Finocchiaro, Paolo, Furman, Valter, Göbel, Kathrin, Garg, Ruchi, Gawlik-Ramięga, Aleksandra, Geslot, Benoit, Gilardoni, Simone, Glodariu, Tudor, Gonçalves, Isabel, González-Romero, Enrique, Guerrero, Carlos, Gunsing, Frank, Harada, Hideo, Heinitz, Stephan, Heyse, Jan, Jenkins, David, Jericha, Erwin, Käppeler, Franz, Kadi, Yacine, Kimura, Atsushi, Kivel, Niko, Kokkoris, Michael, Kopatch, Yury, Krtička, Milan, Kurtulgil, Deniz, Ladarescu, Ion, Leeb, Helmut, Lerendegui-Marco, Jorge, Meo, Sergio Lo, Lonsdale, Sarah-Jane, Macina, Daniela, Manna, Alice, Martínez, Trinitario, Masi, Alessandro, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Matteucci, Francesca, Maugeri, Emilio-Andrea, Mazzone, Annamaria, Mendoza, Emilio, Mengoni, Alberto, Michalopoulou, Veatriki, Milazzo, Paolo Maria, Mingrone, Federica, Musumarra, Agatino, Negret, Alexandru, Nolte, Ralf, Ogállar, Francisco, Oprea, Andreea, Patronis, Nikolas, Pavlik, Andreas, Perkowski, Jarosław, Persanti, Luciano, Quesada, José-Manuel, Radeck, Désirée, Ramos-Doval, Diego, Rauscher, Thomas, Reifarth, René, Rochman, Dimitri, Rubbia, Carlo, Saxena, Alok, Schillebeeckx, Peter, Schumann, Dorothea, Smith, Gavin, Sosnin, Nikolay, Stamatopoulos, Athanasios, Tagliente, Giuseppe, Tain, José, Talip, Zeynep, Tarifeño-Saldivia, Ariel, Tassan-Got, Laurent, Tsinganis, Andrea, Ulrich, Jiri, Urlass, Sebastian, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Woods, PhilipJohn, Woods, Philip John, Wright, Tobias, Žugec, Petar, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), n_TOF, European Project: 677497,H2020,ERC-2015-STG,DoRES(2016), HEP, INSPIRE, and Direct measurements of key nuclear Reactions for the creation of Elements in Stars - DoRES - - H20202016-06-01 - 2021-05-31 - 677497 - VALID

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], FOS: Physical sciences, Nuclear Physics - Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), nucl-ex, Nuclear Experiment
Abstract

Background: The $^{14}$N(n,p)$^{14}$C reaction is of interest in neutron capture therapy, where nitrogen-related dose is the main component due to low-energy neutrons, and in astrophysics, where 14N acts as a neutron poison in the s-process. Several discrepancies remain between the existing data obtained in partial energy ranges: thermal energy, keV region and resonance region. Purpose: Measuring the 14N(n,p)14C cross section from thermal to the resonance region in a single measurement for the first time, including characterization of the first resonances, and providing calculations of Maxwellian averaged cross sections (MACS). Method: Time-of-flight technique. Experimental Area 2 (EAR-2) of the neutron time-of-flight (n_TOF) facility at CERN. $^{10}$B(n,${\alpha}$)$^7$Li and $^{235}$U(n,f) reactions as references. Two detection systems running simultaneously, one on-beam and another off-beam. Description of the resonances with the R-matrix code sammy. Results: The cross section has been measured from sub-thermal energy to 800 keV resolving the two first resonances (at 492.7 and 644 keV). A thermal cross-section (1.809$\pm$0.045 b) lower than the two most recent measurements by slightly more than one standard deviation, but in line with the ENDF/B-VIII.0 and JEFF-3.3 evaluations has been obtained. A 1/v energy dependence of the cross section has been confirmed up to tens of keV neutron energy. The low energy tail of the first resonance at 492.7 keV is lower than suggested by evaluated values, while the overall resonance strength agrees with evaluations. Conclusions: Our measurement has allowed to determine the $^{14}$N(n,p) cross-section over a wide energy range for the first time. We have obtained cross-sections with high accuracy (2.5 %) from sub-thermal energy to 800 keV and used these data to calculate the MACS for kT = 5 to kT = 100 keV., Comment: 18 pages, 15 figures, 4 tables

Published
2022
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49. Increased rerupture rate in younger patients following hamstrings anterior cruciate ligament reconstruction: Mid-term results

Author

Legnani Claudio, Muzzi Stefano, Peretti Giuseppe M, Borgo Enrico, and Ventura Alberto

Subjects
Author keywords Anterior cruciate ligament, Anterior cruciate ligament reconstruction, Reoperation, surgical procedures, operative, musculoskeletal system, human activities
Abstract

BACKGROUND: Several studies observed that younger athletes reported higher rates of second anterior cruciate ligament (ACL) injury. The aim of this study was to retrospectively evaluate ACL rerupture rate in a large cohort of patients who underwent primary ACL reconstruction using hamstring tendon autografts. The hypothesis was that primary ACL reconstruction with hamstring tendon autografts confirmed satisfying results and that younger age could represent a risk factor leading to a higher ACL rerupture rate. METHODS: Two hundred forty-six patients who underwent primary ACL reconstruction between 2004 and 2012 were successfully contacted from senior author’s database after an average follow-up of 10.9 years (range, 7 to 15 years) and they agreed to participate the study. Retrospective chart review was performed for all patients to evaluate variables of age, sex and mechanism of injury. Patients were asked about any subsequent ipsilateral knee ACL injury and/or reoperation. In case they underwent rerupture of the ACL, information about timing from primary surgery were obtained. RESULTS: In 15 patients rerupture occurred. In 12 cases, this was due to a new injury following sports participation. Re-tear occurred mostly in patients practicing soccer and basketball. Patients in the age group

Published
2021

50. Destruction of the cosmic γ-ray emitter 26Al in massive stars: study of the key 26Al(n,p) reaction

Author

Lederer-Woods, Claudia, Woods, Philip John, Davinson, Thomas, Kahl, David, Lonsdale, Sarah Jane, Aberle, Oliver, Amaducci, Simone, Andrzejewski, Józef, Audouin, Laurent, Bacak, Michael, Balibrea-Correa, Javier, Barbagallo, Massimo, Bečvář, František, Berthoumieux, Eric, Billowes, Jon, Bosnar, Damir, Brown, Adam, Caamaño, Manuel, Calviño, Francisco, Calviani, Marco, Cano-Ott, Daniel, Cardella, Roberto, Casanovas, Adria, Cerutti, Francesco, Chen, Y. H., Chiaveri, Enrico, Colonna, Nicola, Cortés, Guillem, Cortés-Giraldo, Miguel Antonio, Cosentino, Luigi, Cristallo, Sergio, Damone, Lucia Anna, Diakaki, Maria, Domingo-Pardo, Cesar, Dressler, Rugard, Dupont, Emmeric, Durán, Ignacio, Fernández-Domínguez, Beatriz, Ferrari, Alfredo, Ferreira, Paulo, Ferrer, Francesc J., Finocchiaro, Paolo, Furman, Valter, Göbel, Kathrin, García, Aczel Regino, Gawlik, Aleksandra, Gilardoni, Simone, Glodariu, Tudor, Gonçalves, Isabel F., González-Romero, Enrique, Griesmayer, Erich, Guerrero, Carlos, Gunsing, Frank, Harada, Hideo, Heinitz, Stephan, Heyse, Jan, Jenkins, David G., Jericha, Erwin, Käppeler, Franz, Kadi, Yacine, Kalamara, Antigoni, Kavrigin, Pavel, Kimura, Atsushi, Kivel, Nikolai, Kokkoris, Michael, Krtička, Milan, Kurtulgil, Deniz, Leal-Cidoncha, E., Leeb, Helmut, Lerendegui-Marco, Jorge, Lo Meo, Sergio, Macina, Daniela, Manna, Alice, Marganiec, Justyna, Martínez, Trinitario, Masi, Alessandro, Massimi, Cristian, Mastinu, Pierfrancesco, Mastromarco, Mario, Maugeri, Emilio-Andrea, Mazzone, Annamaria, Mendoza, Emilio, Mengoni, Alberto, Milazzo, Paolo M., Mingrone, Federica, Musumarra, Agatino, Negret, Alexandru, Nolte, Ralf, Oprea, Andreea, Patronis, Nikolas, Pavlik, Andreas, Perkowski, Jarosław, Porras, Ignacio, Praena, Javier, Quesada, José-Manuel, Radeck, Desiree, Rauscher, Thomas, Reifarth, René, Rubbia, Carlo, Ryan, James A., Sabaté-Gilarte, Marta, Saxena, Alok, Schillebeeckx, Peter, Schumann, Dorothea, Sedyshev, Pavel V., Smith, Alastair G., Sosnin, Nikolay V., Stamatopoulos, Athanasios, Tagliente, Giuseppe, Tain, José L., Tarifeño-Saldivia, Ariel, Tassan-Got, Laurent, Valenta, Stanislav, Vannini, Gianni, Variale, Vincenzo, Vaz, Pedro, Ventura, Alberto, Vlachoudis, Vasilis, Vlastou, Rosa, Wallner, Anton, Warren, Stuart, Weß, Christina, Wright, Tobias, Žugec, Petar, and n_TOF Collaboration

Subjects
ddc:530
Abstract

The 26Al(n,p)26Mg reaction is the key reaction impacting on the abundances of the cosmic γ-ray emitter 26Al produced in massive stars and impacts on the potential pollution of the early solar system with 26Al by asymptotic giant branch stars. We performed a measurement of the 26Al(n,p)26Mg cross section at the high-flux beam line EAR-2 at the n_TOF facility (CERN). We report resonance strengths for eleven resonances, nine being measured for the first time, while there is only one previous measurement for the other two. Our resonance strengths are significantly lower than the only previous values available. Our cross-section data range to 150 keV neutron energy, which is sufficient for a reliable determination of astrophysical reactivities up to 0.5 GK stellar temperature.

Published
2021

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