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Search: WFRF:(Domingo G)

  • Result 51-60 of 146
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51.
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52.
  • Leal-Cidoncha, E., et al. (author)
  • Fission Fragment Angular Distribution measurements of 235U and 238U at CERN n_TOF facility
  • 2016
  • In: EPJ Web of Conferences. - : EDP Sciences. - 2100-014X.
  • Conference paper (peer-reviewed)abstract
    • 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 sections. Therefore, the detection efficiency should be corrected by using the angular distribution of the fission fragments (FFAD), which are barely known above 20 MeV. In addition, the angular distribution of the fragments produced in the fission of highly excited and deformed nuclei is an important observable to investigate the nuclear fission process. In order to measure the FFAD of neutron-induced reactions, a fission detection setup based on parallel-plate avalanche counters (PPACs) has been developed and successfully used at the CERN-n_TOF facility. In this work, we present the preliminary results on the analysis of new U-235(n,f) and U-238(n,f) data in the extended energy range up to 200 MeV compared to the existing experimental data.
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53.
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54.
  • Paradela, C., et al. (author)
  • High accuracy 235U(n,f) data in the resonance energy region
  • 2016
  • In: EPJ Web of Conferences. - : EDP Sciences. - 2100-014X.
  • Conference paper (peer-reviewed)abstract
    • 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 experimental data covering the full region. In this work, we deal with a new analysis of the experimental data obtained with a detection setup based on parallel plate ionization chambers (PPACs) at the CERN n_TOF facility in the range from 1 eV to 10 keV. The relative cross section has been normalised to the IAEA value in the region between 7.8 and 11 eV, which is claimed as well-known. Comparison with the ENDF/B-VII evaluation and the IAEA reference file from 100 eV to 10 keV are provided.
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55.
  • Pasqualato, G., et al. (author)
  • Shape evolution in even-mass 98-104Zr isotopes via lifetime measurements using the γ γ-coincidence technique
  • 2023
  • In: European Physical Journal A. - : Springer. - 1434-6001 .- 1434-601X. ; 59:11
  • Journal article (peer-reviewed)abstract
    • The Zirconium (Z = 40) isotopic chain has attracted interest for more than four decades. The abrupt lowering of the energy of the first 2(+) state and the increase in the transition strength B(E2; 2(1)(+) -> 0(1)(+) ) going from Zr-98 to Zr-100 has been the first example of "quantum phase transition" in nuclear shapes, which has few equivalents in the nuclear chart. Although a multitude of experiments have been performed to measure nuclear properties related to nuclear shapes and collectivity in the region, none of the measured lifetimes were obtained using the Recoil Distance Doppler Shift method in the gamma gamma-coincidence mode where a gate on the direct feeding transition of the state of interest allows a strict control of systematical errors. This work reports the results of lifetime measurements for the first yrast excited states in Zr98-104 carried out to extract reduced transition probabilities. The new lifetime values in gamma gamma-coincidence and gamma-single mode are compared with the results of former experiments. Recent predictions of the Interacting Boson Model with Configuration Mixing, the Symmetry Conserving Configuration Mixing model based on the Hartree-Fock- Bogoliubov approach and the Monte Carlo Shell Model are presented and compared with the experimental data.
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56.
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57.
  • Praena, J., et al. (author)
  • Preparation and characterization of 33S samples for 33S(n,alpha)30Si cross-section measurements at the n_TOF facility at CERN
  • 2018
  • In: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 890, s. 142-147
  • Journal article (peer-reviewed)abstract
    • Thin 33S samples for the study of the 33S(n,alpha)30Si cross-section at the n_TOF facility at CERN were made by thermal evaporation of 33S powder onto a dedicated substrate made of kapton covered with thin layers of copper, chromium and titanium. This method has provided for the first time bare sulfur samples a few centimeters in diameter. The samples have shown an excellent adherence with no mass loss after few years and no sublimation in vacuum at room temperature. The determination of the mass thickness of 33S has been performed by means of Rutherford backscattering spectrometry. The samples have been successfully tested under neutron irradiation.
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58.
  • Tarrío, Diego, et al. (author)
  • Fission Fragment Angular Distribution of Th-232(n,f) at the CERN n_TOF Facility
  • 2014
  • In: Nuclear Data Sheets. - Univ Santiago de Compostela, Santiago De Compostela, Spain. [Leong, L. S.; Audouin, L.; Tassan-Got, L.; Lederer, C.] IPN, CNRS, IN2P3, Orsay, France. [Altstadt, S.; Langer, C.; Lederer, C.; Reifarth, R.; Schmidt, S.; Weigand, M.] Goethe Univ Frankfurt, D-60054 Frankfurt, Germany. [Andrzejewski, J.; Marganiec, J.; Perkowski, J.] Univ Lodz, PL-90131 Lodz, Poland. [Barbagallo, M.; Colonna, N.; Mastromarco, M.; Meaze, M.; Tagliente, G.; Variale, V.] Ist Nazl Fis Nucl, I-70126 Bari, Italy. [Becares, V.; Cano-Ott, D.; Garcia, A. R.; Gonzalez-Romero, E.; Martinez, T.; Mendoza, E.] CIEMAT, E-28040 Madrid, Spain. [Becvar, F.; Krticka, M.; Kroll, J.; Valenta, S.] Charles Univ Prague, Prague, Czech Republic. [Belloni, F.; Berthoumieux, E.; Bosnar, D.; Chiaveri, E.; Fraval, K.; Gunsing, F.] CEA Saclay, Irfu, F-91191 Gif Sur Yvette, France. [Berthoumieux, E.; Boccone, V.; Bosnar, D.; Brugger, M.; Calviani, M.; Cerutti, F.; Chiaveri, E.; Chin, M.; Ferrari, A.; Guerrero, C.; Kadi, Y.; Losito, R.; Roman, F.; Rubbia, C.; Tsinganis, A.; Versaci, R.; Vlachoudis, V.] CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland. [Billowes, J.; Ware, T.; Wright, T. J.] Univ Manchester, Manchester, Lancs, England. [Zugec, P.] Univ Zagreb, Fac Sci, Dept Phys, Zagreb 41000, Croatia. [Calvino, F.; Cortes, G.; Gomez-Hornillos, M. B.; Riego, A.] Univ Politecn Cataluna, Barcelona, Spain. [Carrapico, C.; Goncalves, I. F.; Sarmento, R.; Vaz, P.] Univ Tecn Lisboa, Inst Super Tecn, Inst Tecnol Nucl, P-1096 Lisbon, Portugal. [Cortes-Giraldo, M. A.; Praena, J.; Quesada, J. M.] Univ Seville, Seville, Spain. [Diakaki, M.; Karadimos, D.; Kokkoris, M.; Vlastou, R.] Natl Tech Univ Athens, GR-10682 Athens, Greece. [Domingo-Pardo, C.; Giubrone, G.; Tain, J. L.] Univ Valencia, CSIC, Inst Fis Corpuscular, E-46003 Valencia, Spain. [Dzysiuk, N.; Mastinu, P. F.] Ist Nazl Fis Nucl, Lab Nazl Legnaro, Milan, Italy. [Eleftheriadis, C.; Manousos, A.] Aristotle Univ Thessaloniki, GR-54006 Thessaloniki, Greece. [Ganesan, S.; Gurusamy, P.] Bhabha Atom Res Ctr, Bombay 400085, Maharashtra, India. [Griesmayer, E.; Jericha, E.; Leeb, H.; Weiss, C.] Vienna Univ Technol, Inst Atom, Vienna, Austria. [Jenkins, D. G.; Vermeulen, M. J.] Univ York, York YO10 5DD, N Yorkshire, England. [Kaeppeler, F.] Karlsruhe Inst Technol, Inst Kernphys, D-76021 Karlsruhe, Germany. [Koehler, P.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. [Lederer, C.; Pavlik, A.; Wallner, A.] Univ Vienna, Fac Phys, A-1010 Vienna, Austria. [Massimi, C.; Mingrone, F.; Vannini, G.] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy. [Massimi, C.; Mingrone, F.; Vannini, G.] Sez INFN Bologna, Bologna, Italy. [Mengoni, A.; Ventura, A.] Agenzia Nazl Nuove Tecnol, Eenergia & Sviluppo Econ Sostenibile ENEA, Bologna, Italy. [Milazzo, P. M.] Ist Nazl Fis Nucl, Trieste, Italy. [Mirea, M.; Roman, F.] Horia Hulubei Natl Inst Phys & Nucl Engn, IFIN HH, Bucharest, Romania. [Mondalaers, W.; Plompen, A.; Schillebeeckx, P.] European Commiss JRC, Inst Reference Mat & Measurements, B-2440 Geel, Belgium. [Rauscher, T.] Univ Basel, Dept Phys & Astron, Basel, Switzerland. [Rubbia, C.] Ist Nazl Fis Nucl, Lab Nazl Gran Sasso, Assergi, AQ, Italy. : Elsevier BV. - 0090-3752 .- 1095-9904. ; 119, s. 35-37
  • Journal article (peer-reviewed)abstract
    • The angular distribution of fragments emitted in neutron-induced fission of Th-232 was measured in the white spectrum neutron beam at the n_TOF facility at CERN. A reaction chamber based on Parallel Plate Avalanche Counters (PPAC) was used, where the detectors and the targets have been tilted 45 degrees with respect to the neutron beam direction in order to cover the full angular range of the fission fragments. A GEANT4 simulation has been developed to study the setup efficiency. The data analysis and the preliminary results obtained for the Th-232(n,f) between fission threshold and 100 MeV are presented here.
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59.
  • Tarrío, Diego, et al. (author)
  • Measurement of the angular distribution of fission fragments using a PPAC assembly at CERN n_TOF
  • 2014
  • In: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 743, s. 79-85
  • Journal article (peer-reviewed)abstract
    • A fission reaction chamber based on Parallel Plate Avalanche Counters (PPACs) was built for measuring angular distributions of fragments emitted in neutron-induced fission of actinides at the neutron beam available at the Neutron Time-Of-Flight (n_TOF) facility at CERN. The detectors and the samples were tilted 45 degrees with respect to the neutron beam direction to cover all the possible values of the emission angle of the fission fragments. The main features of this setup are discussed and results on the fission fragment angular distribution are provided for the Th-232(n,f) reaction around the fission threshold. The results are compared with the available data in the literature, demonstrating the good capabilities of this setup.
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60.
  • Tarrío, Diego, et al. (author)
  • 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
  • 2023
  • In: Physical Review C. - : American Physical Society. - 2469-9985 .- 2469-9993. ; 107:4
  • Journal article (peer-reviewed)abstract
    • The neutron-induced fission cross sections of Th-232 and U-233 were measured relative to U-235 in a wide neutron energy range up to 1 GeV (and from fission threshold in the case of Th-232, and from 0.7 eV in case of U-233), 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 U-233, previous results available in EXFOR, whereas in the case of Th-232 these data were obtained from our measurement, using PPACs and targets tilted 45 degrees 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 Th-232 and U-233 and on other isotopes studied earlier at n_TOF using the same experimental setup.
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  • Result 51-60 of 146
Type of publication
journal article (114)
conference paper (22)
research review (1)
Type of content
peer-reviewed (132)
other academic/artistic (5)
Author/Editor
Domingo-Pardo, C (81)
Gottardo, A. (41)
Podolyak, Zs. (39)
Gerl, J. (37)
Goel, N. (37)
Valiente-Dobón, J. J ... (35)
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Boutachkov, P. (35)
Pietri, S. (35)
Reiter, P. (35)
Mengoni, D. (33)
Benzoni, G. (33)
Leoni, S. (33)
Menegazzo, R. (33)
Gorska, M. (33)
Kurz, N (32)
Wollersheim, H.J. (32)
Napoli, D. R. (32)
Reifarth, R (31)
Gadea, A. (31)
Schaffner, H. (31)
Nociforo, C. (31)
Kojouharov, I. (30)
Million, B. (30)
Prochazka, A. (30)
Recchia, F. (29)
Weick, H. (29)
Cerutti, F. (28)
Andrzejewski, J (28)
Cano-Ott, D (28)
Chiaveri, E (28)
Colonna, N (28)
Gunsing, F (28)
Jericha, E (28)
Mengoni, A (28)
Milazzo, P M (28)
Rubbia, C (28)
Tagliente, G (28)
Vaz, P (28)
Vlachoudis, V (28)
Grebosz, J. (28)
Kadi, Y (27)
Calviani, M. (27)
Berthoumieux, E. (27)
Mastromarco, M. (26)
Duran, I (26)
Regan, P. H. (26)
Tarrío, Diego (26)
Farinon, F. (26)
Mendoza, E. (26)
Bosnar, D. (26)
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University
Uppsala University (64)
Lund University (48)
Karolinska Institutet (40)
Royal Institute of Technology (26)
Chalmers University of Technology (5)
Stockholm University (4)
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University of Gothenburg (3)
Umeå University (2)
Linnaeus University (2)
Högskolan Dalarna (2)
Örebro University (1)
Linköping University (1)
Swedish Museum of Natural History (1)
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Language
English (146)
Research subject (UKÄ/SCB)
Natural sciences (92)
Medical and Health Sciences (18)
Engineering and Technology (2)
Humanities (2)

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