Exploració per tema "Cross section"

Ara es mostren els items 1-20 de 70

    • Angular distribution in the neutron-induced fission of actinides 

      Leong, L.S.; Tassan Got, Laurence; Tarrío, D.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gómez Hornillos, María Belén (EPJ Web of Conferences, 2013)
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      Above 1MeV of incident neutron energy the fission fragment angular distribution (FFAD) has generally a strong anisotropic behavior due to the combination of the incident orbital momentum and the intrinsic spin of the ...

    • Astrophysics at n-TOF facility 

      Tagliente, G.; Colonna, Nicola; Marrone, S.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Poch Parés, Agustí; Pretel Sánchez, Carme (2008)
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      The neutron time of flight (n_TOF) facility at CERN is a neutron spallation source, its white neutron energy spectrum ranges from thermal to several GeV, covering the full energy range of interest for nuclear astrophysics, ...

    • Be-7(n,alpha)He-4 reaction and the cosmological lithium problem: measurement of the cross section in a wide energy range at n_TOF at CERN 

      Barbagallo, Massimo; Musumarra, A.; Cosentino, L.; Calviño Tavares, Francisco; Casanovas Hoste, Adrià; Cortés Rossell, Guillem Pere; Tarifeño Saldivia, Ariel Esteban (2016-10-03)
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      The energy-dependent cross section of the Be7(n,alpha)He4 reaction, of interest for the so-called cosmological lithium problem in big bang nucleosynthesis, has been measured for the first time from 10 meV to 10 keV neutron ...

    • Capture cross section of 236U: the n TOF results 

      Barbagallo, Massimo; Colonna, Nicola; Altstadt, Sebastian; Andrzejewski, Józef; Audouin, Ludmila; Bécares, Vicente; Becvar, Zdenek; Belloni, Fabio; Berthoumieux, Eric; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Hernández Prieto, Álvaro; Riego Pérez, Albert (2014-05-01)
      Article
      Accés restringit per política de l'editorial
      Neutron induced capture cross section on 236U has been measured with high accuracy and high resolution at n TOF, in order to improve data libraries needed for the development of advanced nuclear reactors. Preliminary results ...

    • Cross section measurements of 155,157Gd(n,gamma) induced by thermal and epithermal neutrons 

      Mastromarco, M.; Aberle, O.; Calviño Tavares, Francisco; Casanovas Hoste, Adrià; Cortés Rossell, Guillem Pere; Tarifeño Saldivia, Ariel Esteban (2019-01-28)
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      Neutron capture cross section measurements on 155Gd and 157Gd were performed using the time-of-flight technique at the n_TOF facility at CERN on isotopically enriched samples. The measurements were carried out in the n_TOF ...

    • Dissemination of data measured at the CERN n TOF facility 

      Dupont, E.; Otuka, N.; Cabellos, O.; Calviño Tavares, Francisco; Casanovas Hoste, Adrià; Cortés Rossell, Guillem Pere; Tarifeño Saldivia, Ariel Esteban (EDP Sciences, 2016)
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      The n TOF neutron time-of-flight facility at CERN is used for high quality nuclear data measurements from thermal energy up to hundreds of MeV. In line with the CERN open data policy, the n TOF Collaboration takes actions ...

    • Experimental neutron capture data of 58Ni from the CERN n_TOF facility 

      Žugec, Petar; Barbagallo, Massimo; Colonna, Nicola; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Riego Pérez, Albert (EDP Sciences, 2015)
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      The neutron capture cross section of 58Ni was measured at the neutron time of flight facility n_TOF at CERN, from 27 meV to 400 keV neutron energy. Special care has been taken to identify all the possible sources of ...

    • Experimental neutron capture data of 58Ni from the CERN n_TOF facility 

      Zugec, P.; Barbagallo, M.; Colonna, Nicola; Bosnar, D.; Altstadt, S.; Andrzejewski, J.; Audouin, L.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gómez Hornillos, María Belén; Riego Pérez, Albert (2014-01-09)
      Article
      Accés restringit per política de l'editorial
      The 58Ni(n,γ ) cross section has been measured at the neutron time of flight facility n_TOF at CERN, in the energy range from 27 meV up to 400 keV. In total, 51 resonances have been analyzed up to 122 keV. Maxwellian ...

    • Experimental setup and procedure for the measurement of the 7Be(n,p)7Li reaction at n_TOF 

      Barbagallo, Massimo; Andrzejewski, Józef; Mastromarco, M.; Calviño Tavares, Francisco; Casanovas Hoste, Adrià; Cortés Rossell, Guillem Pere; Tarifeño Saldivia, Ariel Esteban (2018-04-11)
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      Following the completion of the second neutron beam line and the related experimental area (EAR2) at the n_TOF spallation neutron source at CERN, several experiments were planned and performed. The high instantaneous neutron ...

    • Experiments with neutron beams for the astrophysical s process 

      Lederer, Claudia; Altstadt, Sebastian; Andrzejewski, Józef; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gómez Hornillos, María Belén (Institute of Physics (IOP), 2013)
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      Neutron capture cross sections are the key nuclear physics input to study the slow neutron capture process, which is responsible for forming about half of the elemental abundances above Fe. Stellar neutron capture cross ...

    • First Measurement of 72Ge(n gamma) at n-TOF 

      Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Tarifeño Saldivia, Ariel Esteban (EDP Sciences, 2018)
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      The slow neutron capture process (s-process) is responsible for producing about half of the elemental abundances heavier than iron in the universe. Neutron capture cross sections on stable isotopes are a key nuclear physics ...

    • Fission fragment angular distribution measurements of U-235 and U-238 at CERN n_TOF facility 

      Leal-Cidoncha, E.; Durán, I.; Paradela, C.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere (EDP Sciences, 2015)
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      Neutron-induced fission cross sections of U-238 and U-235 are used as standards in the fast neutron region up to 200 MeV. A high accuracy of the standards is relevant to experimentally determine other neutron reaction cross ...

    • Fission program at n_TOF 

      Tassan Got, Laurence; Colonna, Nicola; Calviño Tavares, Francisco; Casanovas Hoste, Adrià; Tarifeño Saldivia, Ariel Esteban; Cortés Rossell, Guillem Pere (EPJ Web of Conferences, 2019)
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      Since its start in 2001 the n_TOF collaboration developed a measurement program on fission, in view of advanced fuels in new generation reactors. A special effort was made on measurement of cross sections of actinides, ...

    • Forthcoming (n, gamma) measurements on the Fe and Ni isotopes at CERN n_TOF 

      Domingo-Pardo, C; Andriamonje, S.; Andrzejewski, Józef; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere (Institute of Physics (IOP), 2009)
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      An overview of the past, present and future research activities at the CERN neutron time of flight facility n TOF is given, with special focus on the astrophysical aspects. During the first campaign (Phase I), neutron ...

    • High accuracy 234U(n,f) cross section in the resonance energy region 

      Leal-Cidoncha, E.; Durán, I.; Paradela, C.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gomez Hornillos, B.; Riego Pérez, Albert (EDP Sciences, 2016)
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      New results are presented of the 234U neutron-induced fission cross section, obtained with high accuracy in the resonance region by means of two methods using the 235U(n,f) as reference. The recent evaluation of the 235U(n,f) ...

    • High accuracy 235U(n,f) data in the resonance energy region 

      Paradela, C.; Durán, I.; Tassan Got, Laurence; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Pretel Sánchez, Carme (EDP Sciences, 2015)
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      The 235U neutron-induced cross section is widely used as reference cross section for measuring other fission cross sections, but in the resonance region it is not considered as an IAEA standard because of the scarce ...

    • High accuracy U-235(n,f) data in the resonance energy region 

      Paradela, C.; Durán, I.; Tassan Got, Laurence; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Pretel Sánchez, Carme (EPJ Web of Conferences, 2015)
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      The U-235 neutron-induced cross section is widely used as reference cross section for measuring other fission cross sections, but in the resonance region it is not considered as an IAEA standard because of the scarce ...

    • High precision measurement of the radiative capture cross section of 238U at the n TOF CERN facility 

      Mingrone, Federica; Altstadt, Sebastian; Andrzejewski, Józef; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gómez Hornillos, María Belén; Riego Pérez, Albert (EDP Sciences, 2016)
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      The importance of improving the accuracy on the capture cross-section of 238U has been addressed by the Nuclear Energy Agency, since its uncertainty significantly affects the uncertainties of key design parameters for both ...

    • High-accuracy determination of the 238U/ 235U fission cross section ratio up to ˜ 1 GeV at n_TOF at CERN 

      Paradela, C.; Calviani, Marco; Tarrío, D.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gómez Hornillos, María Belén; Pretel Sánchez, Carme; Riego Pérez, Albert (2015-02-09)
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      The U238 to U235 fission cross section ratio has been determined at n_TOF up to ˜1 GeV, with two different detection systems, in different geometrical configurations. A total of four datasets has been collected and compared. ...

    • High-precision measurement of the 238U(n,¿) cross section with the Total Absorption Calorimeter (TAC) at n TOF, CERN 

      Massimi, Cristian; Mingrone, Federica; Gunsing, Frank; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Riego Pérez, Albert (2014-05-01)
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      Accés restringit per política de l'editorial
      The neutron capture cross section of U-238 is fundamental to the design and operation of current reactors and future fast nuclear reactors, and thus must be measured to a high level of accuracy. An experiment has been ...