Ara es mostren els items 221-240 de 263

    • Searches for nonminimal Higgs bosons from a virtual Z decaying into a muon pair at the SLAC e+ e- storage ring PEP 

      Komamiya, S.; Fordham, C.; Abrams, Geoffrey; Calviño Tavares, Francisco (American Physical Society (APS), 1989-08-01)
      Article
      Accés restringit per política de l'editorial
      Nonminimal neutral Higgs bosons decaying into a muon pair were searched for using the Mark II detector at the SLAC e+e- collider PEP at SQRT(s) =29 GeV. A neutral scalar Higgs boson H0s can be produced accompanied by a ...
    • Simultaneous measurement of neutron-induced capture and fission reactions at CERN 

      Guerrero, C.; Berthoumieux, Eric; Cano-Ott, D; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gómez Hornillos, María Belén (2012)
      Article
      Accés obert
      The measurement of the capture cross-section of fissile elements, of utmost importance for the design of innovative nuclear reactors and the management of nuclear waste, faces particular difficulties related to the -ray ...
    • Simultaneous measurement of the neutron capture and fission yields of 233-U 

      Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Poch Parés, Agustí; Pretel Sánchez, Carme (EDP Sciences, 2007)
      Text en actes de congrés
      Accés obert
      We have measured the neutron capture and fission cross section of 233U at the neutron time-of-flight facility n TOF at CERN in the energy range from 1 eV to 1 MeV with high accuracy by using a high performance 4π BaF2 ...
    • Spin Measurements of n+87Sr for Level Density Studies 

      Gunsing, Frank; Fraval, Kevin; Becvar, F.; Mitchell, G.E.; Andrzejewski, Józef; Altstadt, Sebastian; Audouin, Ludmila; Barbagallo, Massimo; Bécares, Vicente; Belloni, Fabio; Berthoumieux, Eric; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Riego Pérez, Albert (2014-05-01)
      Article
      Accés restringit per política de l'editorial
      We have used the 4p BaF2 gamma-ray detector array at the n TOF neutron time-of-flight facility at CERN for an experiment in order to determine the spins of resonances of n+87Sr by measuring the gamma-ray spectra and ...
    • Status and outlook of the neutron time-of-flight facility n_TOF at CERN 

      Gunsing, Frank; Abbondanno, U; Aerts, G; Alvarez, H; Alvarez Velarde, Francisco; Andriamonje, S; Assimakopoulos, P; Audouin, Ludmila; Badurek, G.; Dolfini, R.; Ferrant, L.; Domingo Pardo, César; Dridi, W.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Duran, I.; Ferrari, A.; Ferreira-Marques, R.; Frais-Koelbl, H.; Furman, W.; Fujii, K; Jericha, E.; Goncalves, I.; Gonzalez Romero, E.; Goverdovski, A.; Karamanis, D.; Gramegna, F.; Griesmayer, E.; Haas, B.; Haight, R.; Kerveno, M.; Herrera Martinez, Aura; Igashira, M.; Isaev, S.; Kappeler, F; Kadi, Y; Karadimos, D.; Ketlerov, V.; Koehler, Paul E.; Konovalov, V.; Kossionides, E.; Krticka, M.; Mengoni, A; Lampoudis, C.; Leeb, H.; Lindote, A.; Neves, F.; Lopes, I.; Marrone, S.; Lukic, S.; Marganiec, J.; Marques, L.; Oberhummer, H.; Martínez, T.; Mastinu, P.; Massimi, Cristian; Milazzo, P.M.; Moreau, C; Mosconi, M.; O'Brien, S.; Oshima, M.; Pancin, J.; Papachristodoulou, C.; Papadopoulos, C.; Rauscher, Thomas; Paradela, C.; Patronis, N.; Pavlik, A.; Rudolf, G.; Pavlopoulos, P.; Perrot, L.; Pigni, M.T.; Plag, R.; Plompen, A.; Plukis, A.; Rullhusen, P.; Pretel Sánchez, Carme; Poch Parés, Agustí; Quesada, J.; Reifarth, R.; Rubbia, C.; Rosetti, M.; Sarchiapone, L.; Salgado, J.; Savvidis, I.; Stephan, C.; Tagliente, G.; Walter, S.; Tassan-Got, L.; Tavora, L.; Becvar, F.; Terlizzi, R.; Vannini, Gianni; Vaz, P.; Ventura, Alberto; Villamarin, D.; Vincente, M.C.; Berthoumieux, Eric; Vlastou, R.; Vlachoudis, V.; Voss, F.; Wendler, H.; Wiescher, M.; Wisshak, K.; Cano-Ott, D; Capote Noy, Roberto; Albornoz, A.C. de; Cennini, P.; Eleftheriadis, C.; Chepel, V.; Chiaveri, E.; Colonna, Nicola; Couture, A.; Cox, J.; Dahlfors, M.; David, S.; Dillmann, Iris; Lozano, Manuel; Guerrero, Carlos; Taín Enríquez, José Luis (2007-08)
      Article
      Accés restringit per política de l'editorial
      The neutron time-of-flight facility n_TOF at CERN, fully operational since 2002, combines a high instantaneous neutron flux with high energy resolution. The wide energy range and the high neutron flux per time-of-flight ...
    • Strong one-neutron emission from two-neutron unbound states in Beta decays of the r-process nuclei 86,87 Ga 

      Yokoyama, R.; Grzywacz, Robert; Rasco, B. Charles; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Tarifeño Saldivia, Ariel Esteban (American Physical Society (APS), 2019-09-19)
      Article
      Accés obert
      Beta-delayed one-neutron and two-neutron branching ratios (P1n and P2n) have been measured in the decay of A = 84 to 87 Ga isotopes at the Radioactive-Isotope Beam Factory (RIBF) at the RIKEN Nishina Center using a ...
    • Study of 234U(n,f) resonances measured at the CERN n TOF facility 

      Tarrío, D.; Audouin, Ludmila; Tassan Got, Laurence; Abbondanno, U.; Andriamonje, S.; Andrzejewski, Józef; Badurek, G.; Becvar, Zdenek; Berthoumieux, Eric; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Pretel Sánchez, Carme (2014-05-01)
      Article
      Accés restringit per política de l'editorial
      We present the analysis of the resolved resonance region for the 234U(n,f) cross section data measured at the CERN n TOF facility. The resonance parameters in the energy range from 1 eV to 1500 eV have been obtained with ...
    • Study of decay properties for Ba to Nd nuclei relevant for the formation of the r-process rare-earth peak (A~160) 

      Pallàs i Solís, Max; Tarifeño Saldivia, Ariel; Kiss, Gábor Gyula; Taín Enríquez, José Luis; Tolosa Delgado, Alvaro; Vitéz Sveiczer, András; Calviño Tavares, Francisco; Agramunt Ros, Jorge; Aguilera, Patricio; Algora, Alejandro; Allmond, James Mitchell; Cortés Rossell, Guillem Pere; Mont i Geli, Nil (2023)
      Article
      Accés obert
      At the RIKEN Nishina Center, exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured. This work reports their half-lives (T1/2) and ß-delayed neutron-emission probabilities (Pxn). The setup consisted of the ...
    • Study of decay properties of Ba to Nd nuclei (A~160) relevant to the formation of the r-process rare-earth peak 

      Pallàs i Solís, Max; Tarifeño Saldivia, Ariel; Kiss, Gábor Gyula; Taín Enríquez, José Luis; Tolosa Delgado, Alvaro; Vitéz Sveiczer, András; Calviño Tavares, Francisco; Agramunt Ros, Jorge; Aguilera, Patricio; Algora, Alejandro; Allmond, James Mitchell; Baba, H.; Mont i Geli, Nil (2023-05-26)
      Article
      Accés obert
      Half-lifes (T1/2) of exotic neutron-rich isotopes of Ba, La, Ce, Pr, and Nd were measured at the RIKEN Nishina Center. The experimental setup consisted of the BigRIPS in-flight separator for ion selection identification, ...
    • Study of photon strength function of actinides: the case of 235-U, 238-Np and 241-Pu 

      Cano Ott, Daniel; Colonna, Nicola; Tagliente, G.; Belloni, Fabio; Abbondanno, U.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Poch Parés, Agustí; Pretel Sánchez, Carme (2011-08-12)
      Article
      Accés restringit per política de l'editorial
      The decay from excited levels in medium and heavy nuclei can be described in a statistical approach by means of Photon Strength Functions and Level Density distributions. The study of electromagnetic cascades following ...
    • Study of the 234U(n,f) fission fragment angular distribution at the CERN n_TOF facility 

      Leal-Cidoncha, E.; Duran, Ignacio; Paradela, C.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere (2014)
      Text en actes de congrés
      Accés obert
      The angular distribution of the f ssion fragments (FFAD) produced in neutron induced reactions of actinides have been measured with a fission detection setup based on parallel-plate avalanche counters (PPACs) at the Neutron ...
    • Study of the background in the measuring station at the n_TOF facility at CERN: sources and solutions 

      Abbondanno, U.; Aerts, G.; Andriamonje, S.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Poch Parés, Agustí; Pretel Sánchez, Carme (2001-12-10)
      Report de recerca
      Accés obert
      A background roughly two orders of magnitude higher than tolerable was found in the n_TOF facility at CERN during the first measurements. This note describes a series of additional measurements performed in the n_TOF ...
    • Study of the photon strength function of 152SM in resonance neutron capture at n-TOF 

      Marrone, S.; Colonna, Nicola; Krticka, M.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Alvarez Pol, Héctor; Alvarez Velarde, Francisco; Andrzejewski, Józef; Audouin, Ludmila; Berthoumieux, Eric; Capdevila Paramio, Roser; Poch, Agustí; Pretel Sánchez, Carme (PoS - Proceedings of Science, 2018)
      Text en actes de congrés
      Accés obert
      The Photon Strength Function of 152Sm has been investigated at nTOF by studying the ¿-ray spectra from resonance neutron capture of 151Sm. The experimental apparatus consisted of two C6D6 liquid scintillator detectors. The ...
    • The (n,alpha) reaction in the s-process branching point 59Ni 

      Weiß, C.; Griesmayer, E.; Andrzejewski, Józef; Badurek, G.; Dressler, Rugard; Koehler, Paul E.; Lederer, Claudia; Altstadt, Sebastian; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gómez Hornillos, María Belén; Riego Pérez, Albert (2014-06-01)
      Article
      Accés restringit per política de l'editorial
      The (n,alpha) reaction in the radioactive 59Ni is of relevance in nuclear astrophysics as 59Ni can be considered as the first branching point in the astrophysical s-process. Its relevance in nuclear technology is especially ...
    • The 139La(n, gamma) cross section: key for the onset of the s-process 

      Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Poch Parés, Agustí; Pretel Sánchez, Carme (2007-03)
      Article
      Accés restringit per política de l'editorial
      The nuclear resonance parameters and the capture cross section of the neutron magic isotope 139La have been measured relative to 197Au in the energy range of 0.6 eV to 9 keV at the neutron time-of-flight (n TOF) facility ...
    • The 234U neutron capture cross section measurement at the n TOF facility 

      Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Poch Parés, Agustí; Pretel Sánchez, Carme (EDP Sciences, 2007)
      Text en actes de congrés
      Accés obert
      The neutron capture cross-section of 234U has been measured for energies from thermal up to the keV region in the neutron time-of-flight facility n TOF, based on a spallation source located at CERN. A 4π BaF2 array composed ...
    • The 236U neutron capture cross-section measured at the n TOF CERN facility 

      Mastromarco, M.; Barbagallo, Massimo; Vermeulen, M.J.; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gómez Hornillos, María Belén; Riego Pérez, Albert (EDP Sciences, 2016)
      Text en actes de congrés
      Accés obert
      The 236U isotope plays an important role in nuclear systems, both for future and currently operating ones. The actual knowledge of the capture reaction of this isotope is satisfactory in the thermal region, but it is ...
    • The 237Np(n,f) cross section at the CERN n-TOF facility 

      Karadimos, D.; Vlastou, R.; Calviño Tavares, Francisco; Pretel Sánchez, Carme; Cortés Rossell, Guillem Pere (American Institute of Physics (AIP), 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The 237Np(n,f) cross sections have been measured at the n-TOF facility relative to the 235U and 238U fission cross sections. The n-TOF spallation neutron source at CERN is characterized by a high intensity flux, an excellent ...
    • The 33S(n,alpha)30Si cross section measurement at n TOF-EAR2 (CERN): From 0.01 eV to the resonance region 

      Sabaté-Gilarte, M.; Praena, J.; Porras, I.; Calviño Tavares, Francisco; Casanovas Hoste, Adrià; Cortés Rossell, Guillem Pere; Tarifeño Saldivia, Ariel Esteban (EDP Sciences, 2016)
      Comunicació de congrés
      Accés obert
      The 33S(n,a)30Si cross section measurement, using 10B(n,a) as reference, at the n_TOF Experimental Area 2 (EAR2) facility at CERN is presented. Data from 0.01¿eV to 100¿keV are provided and, for the first time, the cross ...
    • The 93-Zr(n,gamma) reaction up to 8 keV neutron energy 

      Tagliente, G.; Milazzo, P.M.; Fujiii, K.; Abbondanno, U.; Aerts, G.; Calviño Tavares, Francisco; Pretel Sánchez, Carme; Cortés Rossell, Guillem Pere (2013-01-31)
      Article
      Accés restringit per política de l'editorial
      he (n,gamma) reaction of the radioactive isotope 93Zr has been measured at the n_TOF high-resolution time-of-flight facility at CERN. Resonance parameters have been extracted in the neutron energy range up to 8 keV,yielding ...