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Your search keyword '"D. González-Díaz"' showing total 7 results
Start Over Author "D. González-Díaz" Journal physical review letters
7 results on '"D. González-Díaz"'

1. SubthresholdΞ−Production in Collisions ofp(3.5 GeV)+Nb

Author

S. P. Chernenko, Volker Metag, T. Heinz, J. Michel, O. Pechenova, J. Pietraszko, Laura Fabbietti, Yu.V. Zanevsky, D. González-Díaz, M. B. Golubeva, A. Balanda, Piotr Salabura, L. Naumann, P. Tlusty, Y. Parpottas, C. Wendisch, Kirill Lapidus, C. Müntz, A. Tarantola, L. Maier, Filip Krizek, B. Spruck, Eliane Epple, R. Müntzer, Yu. G. Sobolev, T. Hennino, H. Tsertos, A. M. Schmah, S. Yurevich, Y. C. Pachmayer, Kathrin Göbel, A. Lebedev, W. Kühn, G. Kornakov, P. Cabanelas, J. Stroth, B. Ramstein, Witold Przygoda, S. Lang, I. Koenig, V. Pechenov, D. Belver, Andrey Reshetin, M. Lorenz, H. Kuc, Tatiana Karavicheva, A. B. Kurepin, M. Traxler, Alexander Belyaev, T. A. Vasiliev, B. W. Kolb, J. Friese, O. V. Fateev, Tetyana Galatyuk, J. Siebenson, M. Böhmer, A. Mangiarotti, C. Sturm, W. Koenig, E. Schwab, A.P. Ierusalimov, B. Kämpfer, A. Rustamov, J. Wüstenfeld, R. Lalik, T. Liu, J. L. Boyard, L. Lopes, M. Gumberidze, Roman Gernhäuser, R. Krücken, R. Holzmann, J. Markert, G. Agakishiev, Paolo Finocchiaro, A. Kugler, V. P. Ladygin, B. Michalska, S. Spataro, I. Fröhlich, A. Dybczak, J. C. Berger-Chen, A. Krása, J. A. Garzón, A. Blanco, P. Fonte, M. Jurkovic, A. Ivashkin, R. Kotte, Fedor Guber, Oliver Werner Arnold, Michael Weber, R. Trebacz, I. Iori, H. Ströbele, V. Wagner, K. Teilab, Marek Palka, and A. Sadovsky

Subjects
Nuclear physics, Baryon, Physics, Particle physics, Subthreshold conduction, Hyperon, General Physics and Astronomy, Heavy ion, 7. Clean energy, Beam energy
Abstract

Results on the production of the double strange cascade hyperon Ξ^{-} are reported for collisions of p(3.5 GeV)+Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. For the first time, subthreshold Ξ^{-} production is observed in proton-nucleus interactions. Assuming a Ξ^{-} phase-space distribution similar to that of Λ hyperons, the production probability amounts to P_{Ξ^{-}}=[2.0±0.4(stat)±0.3(norm)±0.6(syst)]×10^{-4} resulting in a Ξ^{-}/(Λ+Σ^{0}) ratio of P_{Ξ^{-}}/P_{Λ+Σ^{0}}=[1.2±0.3(stat)±0.4(syst)]×10^{-2}. Available model predictions are significantly lower than the measured Ξ^{-} yield.

Published
2015

2. Deep SubthresholdΞ−Production inAr+KClReactions at1.76A GeV

Author

G. Agakishiev, A. Balanda, R. Bassini, D. Belver, A. V. Belyaev, A. Blanco, M. Böhmer, J. L. Boyard, P. Braun-Munzinger, P. Cabanelas, E. Castro, S. Chernenko, T. Christ, M. Destefanis, J. Díaz, F. Dohrmann, A. Dybczak, T. Eberl, L. Fabbietti, O. V. Fateev, P. Finocchiaro, P. Fonte, J. Friese, I. Fröhlich, T. Galatyuk, J. A. Garzón, R. Gernhäuser, A. Gil, C. Gilardi, M. Golubeva, D. González-Díaz, F. Guber, T. Hennino, R. Holzmann, I. Iori, A. Ivashkin, M. Jurkovic, B. Kämpfer, K. Kanaki, T. Karavicheva, D. Kirschner, I. Koenig, W. Koenig, B. W. Kolb, R. Kotte, F. Krizek, R. Krücken, W. Kühn, A. Kugler, A. Kurepin, S. Lang, J. S. Lange, K. Lapidus, T. Liu, L. Lopes, M. Lorenz, L. Maier, A. Mangiarotti, J. Markert, V. Metag, B. Michalska, J. Michel, D. Mishra, E. Morinière, J. Mousa, C. Müntz, L. Naumann, J. Otwinowski, Y. C. Pachmayer, M. Palka, Y. Parpottas, V. Pechenov, O. Pechenova, J. Pietraszko, W. Przygoda, B. Ramstein, A. Reshetin, M. Roy-Stephan, A. Rustamov, A. Sadovsky, B. Sailer, P. Salabura, A. Schmah, Yu. G. Sobolev, S. Spataro, B. Spruck, H. Ströbele, J. Stroth, C. Sturm, M. Sudol, A. Tarantola, K. Teilab, P. Tlusty, M. Traxler, R. Trebacz, H. Tsertos, V. Wagner, M. Weber, M. Wisniowski, T. Wojcik, J. Wüstenfeld, S. Yurevich, Y. V. Zanevsky, P. Zhou, and P. Zumbruch

Subjects
Nuclear reaction, Physics, 010308 nuclear & particles physics, Hadron, Hyperon, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Xi baryon, Sigma baryon, Baryon, Nuclear physics, Particle decay, 0103 physical sciences, Production (computer science), Atomic physics, 010306 general physics
Abstract

We report first results on a deep subthreshold production of the doubly strange hyperon XI{sup -} in a heavy-ion reaction. At a beam energy of 1.76A GeV the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer at SIS18/GSI. A high-statistics and high-purity LAMBDA sample was collected, allowing for the investigation of the decay channel XI{sup -}->LAMBDApi{sup -}. The deduced XI{sup -}/(LAMBDA+SIGMA{sup 0}) production ratio of (5.6+-1.2{sub -1.7}{sup +1.8})x10{sup -3} is significantly larger than available model predictions.

Published
2009

3. Dielectron Production inC12+C12Collisions at2A GeVwith the HADES Spectrometer

Author

B. W. Kolb, T. Hennino, C. Gilardi, Jacek Tomasz Otwinowski, D. Magestro, R. Coniglione, A. Ivashkin, E. Schwab, A. Sadovsky, G. Bellia, R. Kotte, A.P. Ierusalimov, F. Dohrmann, Kalliopi Kanaki, J. Friese, T. Wojcik, T. Christ, A. Rustamov, P. Cabanelas, J. A. Garzón, M. Sudol, H. Tsertos, Tatiana Karavicheva, M. Jurkovic, O. V. Fateev, Alexey Kurepin, D. González-Díaz, J. S. Díaz, C. Agodi, M. Jaskula, W. Kühn, M. Suk, Peter Braun-Munzinger, Alberica Toia, Karl Zeitelhack, C. Sturm, C. Schröder, J. L. Boyard, P. Zumbruch, Yu.V. Zanevsky, Andrey Reshetin, H. J. Körner, B. Spruck, D. Vassiliev, W. Schön, V. Pechenov, H. Ströbele, A. Vazquez, T. Eberl, Paolo Finocchiaro, V. T. Smolyankin, M. Kagarlis, Adam Malarz, B. Sailer, A. Taranenko, V. Wagner, C. Fernandez, W. Koenig, I. Iori, Wolfgang Enghardt, Jehad Mousa, Piotr Salabura, M. Ploskon, Witold Przygoda, T. Pérez, E. Lins, A. Nekhaev, H. Alvarez-Pol, S. Lange, Laura Fabbietti, C. Müntz, R.S. Simon, A. Balanda, M. Roy-Stephan, M. Sánchez, D. Zovinec, Paul Kienle, V. Pospíšil, M.B. Golubeva, L. Kidon, Luigi Cosentino, G. Agakichiev, Paolo Sapienza, R. Holzmann, J. Markert, P. Tlusty, M. Traxler, B. Kämpfer, A. M. Schmah, E. Grosse, I. Duran, S. Hlavac, Yvonne Chiara Pachmayer, B. Fuentes, H. Schön, S. Lang, J. Pietraszko, Paolo Piattelli, M. Münch, J. Lehnert, W. Prokopowicz, H. Bokemeyer, B. Ramstein, Jaroslav Bielcik, R. Krücken, Władysław Waluś, S. Spataro, I. Fröhlich, R. Pleskac, J. Stroth, I. Koenig, M. Wiśniowski, J. Homolka, L. Naumann, Jan Novotny, L. Smykov, J. Ritman, S. P. Chernenko, J. Wüstenfeld, D. Bertini, F.F. Guber, M. Böhmer, C. Garabatos, C. Maiolino, Reinhard Kulessa, Roman Gernhäuser, A. Kugler, M. Kajetanowicz, A. Kastenmüller, and V. Metag

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, General Physics and Astronomy, Electron, 7. Clean energy, 01 natural sciences, Omega, Nuclear physics, Particle decay, Pair production, Orders of magnitude (time), 0103 physical sciences, Mass spectrum, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Nucleon
Abstract

The invariant-mass spectrum of e{sup +}e{sup -} pairs produced in {sup 12}C+{sup 12}C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the {pi}{sup 0}-Dalitz to the {rho}/{omega} invariant-mass region. Dalitz decays of {pi}{sup 0} and {eta} account for all the yield up to 0.15 GeV/c{sup 2}, but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.

Published
2007

4. Demonstration of Single-Barium-Ion Sensitivity for Neutrinoless Double-Beta Decay Using Single-Molecule Fluorescence Imaging.

Author

McDonald AD, Jones BJP, Nygren DR, Adams C, Álvarez V, Azevedo CDR, Benlloch-Rodríguez JM, Borges FIGM, Botas A, Cárcel S, Carrión JV, Cebrián S, Conde CAN, Díaz J, Diesburg M, Escada J, Esteve R, Felkai R, Fernandes LMP, Ferrario P, Ferreira AL, Freitas EDC, Goldschmidt A, Gómez-Cadenas JJ, González-Díaz D, Gutiérrez RM, Guenette R, Hafidi K, Hauptman J, Henriques CAO, Hernandez AI, Hernando Morata JA, Herrero V, Johnston S, Labarga L, Laing A, Lebrun P, Liubarsky I, López-March N, Losada M, Martín-Albo J, Martínez-Lema G, Martínez A, Monrabal F, Monteiro CMB, Mora FJ, Moutinho LM, Muñoz Vidal J, Musti M, Nebot-Guinot M, Novella P, Palmeiro B, Para A, Pérez J, Querol M, Repond J, Renner J, Riordan S, Ripoll L, Rodríguez J, Rogers L, Santos FP, Dos Santos JMF, Simón A, Sofka C, Sorel M, Stiegler T, Toledo JF, Torrent J, Tsamalaidze Z, Veloso JFCA, Webb R, White JT, and Yahlali N

Abstract

A new method to tag the barium daughter in the double-beta decay of ^{136}Xe is reported. Using the technique of single molecule fluorescent imaging (SMFI), individual barium dication (Ba^{++}) resolution at a transparent scanning surface is demonstrated. A single-step photobleach confirms the single ion interpretation. Individual ions are localized with superresolution (∼2  nm), and detected with a statistical significance of 12.9σ over backgrounds. This lays the foundation for a new and potentially background-free neutrinoless double-beta decay technology, based on SMFI coupled to high pressure xenon gas time projection chambers.

Published
2018
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5. Subthreshold Ξ^{-} production in collisions of p(3.5  GeV)+Nb.

Author

Agakishiev G, Arnold O, Balanda A, Belver D, Belyaev AV, Berger-Chen JC, Blanco A, Böhmer M, Boyard JL, Cabanelas P, Chernenko S, Dybczak A, Epple E, Fabbietti L, Fateev OV, Finocchiaro P, Fonte P, Friese J, Fröhlich I, Galatyuk T, Garzón JA, Gernhäuser R, Göbel K, Golubeva M, González-Díaz D, Guber F, Gumberidze M, Heinz T, Hennino T, Holzmann R, Ierusalimov A, Iori I, Ivashkin A, Jurkovic M, Kämpfer B, Karavicheva T, Koenig I, Koenig W, Kolb BW, Kornakov G, Kotte R, Krása A, Krizek F, Krücken R, Kuc H, Kühn W, Kugler A, Kurepin A, Ladygin V, Lalik R, Lang S, Lapidus K, Lebedev A, Liu T, Lopes L, Lorenz M, Maier L, Mangiarotti A, Markert J, Metag V, Michalska B, Michel J, Müntz C, Müntzer R, Naumann L, Pachmayer YC, Palka M, Parpottas Y, Pechenov V, Pechenova O, Pietraszko J, Przygoda W, Ramstein B, Reshetin A, Rustamov A, Sadovsky A, Salabura P, Schmah A, Schwab E, Siebenson J, Sobolev YG, Spataro S, Spruck B, Ströbele H, Stroth J, Sturm C, Tarantola A, Teilab K, Tlusty P, Traxler M, Trebacz R, Tsertos H, Vasiliev T, Wagner V, Weber M, Wendisch C, Wüstenfeld J, Yurevich S, and Zanevsky YV

Abstract

Results on the production of the double strange cascade hyperon Ξ^{-} are reported for collisions of p(3.5  GeV)+Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. For the first time, subthreshold Ξ^{-} production is observed in proton-nucleus interactions. Assuming a Ξ^{-} phase-space distribution similar to that of Λ hyperons, the production probability amounts to P_{Ξ^{-}}=[2.0±0.4(stat)±0.3(norm)±0.6(syst)]×10^{-4} resulting in a Ξ^{-}/(Λ+Σ^{0}) ratio of P_{Ξ^{-}}/P_{Λ+Σ^{0}}=[1.2±0.3(stat)±0.4(syst)]×10^{-2}. Available model predictions are significantly lower than the measured Ξ^{-} yield.

Published
2015
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6. Deep subthreshold Xi;{-} production in Ar + KCl reactions at 1.76A GeV.

Author

Agakishiev G, Balanda A, Bassini R, Belver D, Belyaev AV, Blanco A, Böhmer M, Boyard JL, Braun-Munzinger P, Cabanelas P, Castro E, Chernenko S, Christ T, Destefanis M, Díaz J, Dohrmann F, Dybczak A, Eberl T, Fabbietti L, Fateev OV, Finocchiaro P, Fonte P, Friese J, Fröhlich I, Galatyuk T, Garzón JA, Gernhäuser R, Gil A, Gilardi C, Golubeva M, González-Díaz D, Guber F, Hennino T, Holzmann R, Iori I, Ivashkin A, Jurkovic M, Kämpfer B, Kanaki K, Karavicheva T, Kirschner D, Koenig I, Koenig W, Kolb BW, Kotte R, Krizek F, Krücken R, Kühn W, Kugler A, Kurepin A, Lang S, Lange JS, Lapidus K, Liu T, Lopes L, Lorenz M, Maier L, Mangiarotti A, Markert J, Metag V, Michalska B, Michel J, Mishra D, Morinière E, Mousa J, Müntz C, Naumann L, Otwinowski J, Pachmayer YC, Palka M, Parpottas Y, Pechenov V, Pechenova O, Pietraszko J, Przygoda W, Ramstein B, Reshetin A, Roy-Stephan M, Rustamov A, Sadovsky A, Sailer B, Salabura P, Schmah A, Sobolev YG, Spataro S, Spruck B, Ströbele H, Stroth J, Sturm C, Sudol M, Tarantola A, Teilab K, Tlusty P, Traxler M, Trebacz R, Tsertos H, Wagner V, Weber M, Wisniowski M, Wojcik T, Wüstenfeld J, Yurevich S, Zanevsky YV, Zhou P, and Zumbruch P

Abstract

We report first results on a deep subthreshold production of the doubly strange hyperon Xi;{-} in a heavy-ion reaction. At a beam energy of 1.76A GeV the reaction Ar + KCl was studied with the High Acceptance Di-Electron Spectrometer at SIS18/GSI. A high-statistics and high-purity Lambda sample was collected, allowing for the investigation of the decay channel Xi;{-} --> Lambdapi;{-}. The deduced Xi;{-}/(Lambda + Sigma;{0}) production ratio of (5.6 +/- 1.2_{-1.7};{+1.8}) x 10;{-3} is significantly larger than available model predictions.

Published
2009
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7. Dielectron production in 12C+12C collisions at 2A GeV with the HADES spectrometer.

Author

Agakichiev G, Agodi C, Alvarez-Pol H, Bałanda A, Bertini D, Bielcik J, Bellia G, Böhmer M, Bokemeyer H, Boyard JL, Braun-Munzinger P, Cabanelas P, Chernenko S, Christ T, Coniglione R, Cosentino L, Díaz J, Dohrmann F, Durán I, Eberl T, Enghardt W, Fabbietti L, Fateev O, Fernandez C, Finocchiaro P, Friese J, Fröhlich I, Fuentes B, Garabatos C, Garzón JA, Gernhäuser R, Gilardi C, Golubeva M, González-Díaz D, Grosse E, Guber F, Hennino T, Hlavac S, Holzmann R, Homolka J, Ierusalimov A, Iori I, Ivashkin A, Jaskuła M, Jurkovic M, Kagarlis M, Kajetanowicz M, Kämpfer B, Kanaki K, Karavicheva T, Kastenmüller A, Kidoń L, Kienle P, Koenig I, Koenig W, Körner HJ, Kolb BW, Kotte R, Krücken R, Kugler A, Kühn W, Kulessa R, Kurepin A, Lang S, Lange S, Lehnert J, Lins E, Magestro D, Maiolino C, Malarz A, Markert J, Metag V, Mousa J, Münch M, Müntz C, Naumann L, Nekhaev A, Novotny J, Otwinowski J, Pachmayer YC, Pechenov V, Pérez T, Piattelli P, Pietraszko J, Pleskac R, Płoskoń M, Pospísil V, Prokopowicz W, Przygoda W, Ramstein B, Reshetin A, Ritman J, Roy-Stephan M, Rustamov A, Sadovsky A, Sailer B, Salabura P, Sánchez M, Sapienza P, Schmah A, Schön H, Schön W, Schröder C, Schwab E, Simon RS, Smolyankin V, Smykov L, Spataro S, Spruck B, Ströbele H, Stroth J, Sturm C, Sudoł M, Suk M, Taranenko A, Tlusty P, Toia A, Traxler M, Tsertos H, Vassiliev D, Vázquez A, Wagner V, Waluś W, Wiśniowski M, Wójcik T, Wüstenfeld J, Zanevsky Y, Zeitelhack K, Zovinec D, and Zumbruch P

Abstract

The invariant-mass spectrum of e+e- pairs produced in 12C+12C collisions at an incident energy of 2 GeV per nucleon has been measured for the first time. The measured pair production probabilities span over 5 orders of magnitude from the pi(0)-Dalitz to the rho/omega invariant-mass region. Dalitz decays of pi(0) and eta account for all the yield up to 0.15 GeV/c(2), but for only about 50% above this mass. A comparison with model calculations shows that the excess pair yield is likely due to baryon-resonance and vector-meson decays. Transport calculations based on vacuum spectral functions fail, however, to describe the entire mass region.

Published
2007
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