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- Inverse kinematics (4)
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Salabura, Piotr ; Adamczewski-Musch, Jörn ; Arnoldi-Meadows, Benedict ; Belounnas, Amel ; Belyaev, Alexei V. ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Borisenko, S. ; Chlad, Lukáš ; Chudoba, Petr ; Ciepał, Izabela ; Dittert, Dominique ; Dreyer, Jörn ; Esmail, Waleed Ahmed Mohammed ; Dürr, Michael ; Fabbietti, Laura ; Fateev, Oleg ; Fonte, Paulo ; Friese, Jürgen ; Fröhlich, Ingo ; Förtsch, Jörg ; Galatyuk, Tetyana ; Gernhäuser, Roman ; Golosov, Oleg ; Golubeva, Marina ; Greifenhagen, Robert ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Hensch, Roman ; Höhne, Claudia ; Holzmann, Romain ; Huck, Holger ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Kämpfer, Burkhard ; Kampert, Karl-Heinz ; Kardan, Behruz ; Koenig, Ilse ; Koenig, Wolfgang ; Kornakov, Georgy ; Kornas, Frédéric Julian ; Kotte, Roland ; Kozela, Adam ; Kres, Ievgenii ; Kuboś, Joanna ; Kugler, Andrej ; Kulessa, Pawel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lebedev, Alexei ; Lebedev, Semen ; Linev, Serguei ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Lykasov, Gennady ; Mahmoud, Tariq ; Malige, Akshay ; Markert, Jochen ; Matulewicz, Tomasz ; Maurus, Steffen ; Metag, Volker ; Michel, Jan ; Morozov, Sergey ; Müntz, Christian ; Naumann, Lothar ; Nowakowski, Krzysztof ; Otto, Jan-Hendrik ; Patel, Vivek ; Pauly, Christian ; Pechenov, Vladimir ; Pechenova, Olga ; Petukhov, Oleg ; Pfeifer, Dennis ; Piasecki, Krzysztof ; Pietraszko, Jerzy ; Prozorov, Alexandr ; Przygoda, Witold ; Pysz, Krzysztof ; Ramstein, Béatrice ; Rathod, Narendra ; Reshetin, Andrey ; Ritman, James Lambrecht ; Rodríguez Ramos, Pablo ; Rost, Adrian ; Salabura, Piotr ; Scozzi, Federico ; Seck, Florian ; Selyuzhenkov, Ilya ; Shabanov, I. ; Singh, Udai ; Smyrski, Jerzy ; Spies, Simon ; Ströbele, Herbert ; Stroth, Joachim ; Stumm, Julia ; Svoboda, Ondřej ; Szala, Melanie ; Tlustý, Pavel ; Traxler, Michael ; Ungethüm, Carina ; Vázquez Doce, Oton ; Wagner, Vladimir ; Weber, Adrian Amatus ; Wendisch, Christian ; Wiebusch, Michael ; Wintz, Peter ; Wirth, Joana ; Zhilin, Alexander ; Zumbruch, Peter W.
Radiative transition of an excited baryon to a nucleon with emission of a virtual massive photon converting to dielectron pair (Dalitz decays) provides important information about baryon-photon coupling at low q2 in timelike region. A prominent enhancement in the respective electromagnetic transition Form Factors (etFF) at q2 near vector mesons ρ/ω poles has been predicted by various calculations reflecting strong baryon-vector meson couplings. The understanding of these couplings is also of primary importance for the interpretation of the emissivity of QCD matter studied in heavy ion collisions via dilepton emission. Dedicated measurements of baryon Dalitz decays in proton-proton and pion-proton scattering with HADES detector at GSI/FAIR are presented and discussed. The relevance of these studies for the interpretation of results obtained from heavy ion reactions is elucidated on the example of the HADES results.
Holl, Matthias ; Panin, Valerii ; Álvarez-Pol, Héctor ; Atar, Leyla ; Aumann, Thomas ; Beceiro-Novo, Saul ; Benlliure Anaya, Jose Fernando ; Bertulani, Carlos A. ; Boillos Betete, Juan Manuel ; Boretzky, Konstanze ; Caamaño, Manuel ; Caesar, Christoph ; Casarejos Ruiz, Enrique ; Catford, Wilton N. ; Cederkäll, Joakim ; Chulkov, Leonid V. ; Cortina Gil, Dolores ; Cravo, Edgar ; Dillmann, Iris ; Díaz Fernández, Paloma ; Elekes, Zoltán ; Enders, Joachim ; Fraile Prieto, Luis Mario ; Galaviz Redondo, Daniel ; Gernhäuser, Roman ; Golubev, Pavel ; Heftrich, Tanja ; Heil, Michael ; Heine, Marcel ; Heinz, Andreas ; Henriques Correia, Ana Maria ; Johansson, Håkan T. ; Jonson, Björn ; Kalantar-Nayestanaki, Nasser ; Kanungo, Rituparna ; Kelic-Heil, Aleksandra ; Kröll, Thorsten ; Kurz, Nikolaus ; Langer, Christoph ; Le Bleis, Tudi ; Lindberg, Simon ; Machado, Jorge ; Nácher González, Enrique ; Najafi, Mohammad Ali ; Nilsson, Thomas ; Nociforo, Chiara ; Paschalis, Stefanos ; Petri, Marina ; Reifarth, René ; Ribeiro Jimenez, Guillermo ; Rigollet, Catherine ; Rossi, Dominic M. ; Savran, Deniz ; Scheit, Heiko ; Simon, Haik ; Sorlin, Olivier ; Syndikus, Ina ; Tengblad, Olof ; Togano, Yasuhiro ; Vandebrouck, Marine ; Velho, Paulo ; Wamers, Felix ; Weick, Helmut ; Wheldon, Carl ; Wilson, Gemma Louise ; Winfield, John S. ; Woods, Philip John ; Zhukov, Mikhail V. ; Zuber, Kai
The quasi-free scattering reactions 11C(p, 2p) and 10,11,12C(p, pn) have been studied in inverse kinematics at beam energies of 300–400 MeV/u at the R3B-LAND setup. The outgoing proton-proton and protonneutron pairs were detected in coincidence with the reaction fragments in kinematically complete measurements. The efficiency to detect these pairs has been obtained from GEANT4 simulations which were tested using the 12C(p, 2p) and 12C(p, pn) reactions. Experimental cross sections and momentum distributions have been obtained and compared to DWIA calculations based on eikonal theory. The new results reported here are combined with previously published cross sections for quasi-free scattering from oxygen and nitrogen isotopes and together they enable a systematic study of the reduction of singleparticle strength compared to predictions of the shell model over a wide neutron-to-proton asymmetry range. The combined reduction factors show a weak or no dependence on isospin asymmetry, in contrast to the strong dependency reported in nucleon-removal reactions induced by nuclear targets at lower energies. However, the reduction factors for (p, 2p) are found to be ’significantly smaller than for (p, pn) reactions for all investigated nuclei.
Agakishiev, Geydar ; Álvarez-Pol, Héctor ; Balanda, Andrzej ; Bassini, Roberto ; Böhmer, Michael ; Bokemeyer, Helmut ; Boyard, Jean-Louis ; Cabanelas Eiras, Pablo ; Chernenko, Sergey ; Christ, Tassilo ; Destefanis, Marco Giovanni Maria ; Dohrmann, Frank ; Dybczak, Adrian ; Eberl, Thomas ; Fabbietti, Laura ; Fateev, Oleg ; Finocchiaro, Paolo ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Gilardi, Camilla ; Golubeva, Marina ; González-Díaz, Diégo ; Guber, Fedor ; Gumberidze, Malgorzata ; Hennino, Thierry ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Iori, Ileana ; Ivashkin, Alexander ; Jurkovič, Martin ; Kämpfer, Burkhard ; Kanaki, Kalliopi ; Karavicheva, Tatiana ; Koenig, Ilse ; Koenig, Wolfgang ; Kolb, Burkhard W. ; Kotte, Roland ; Kozuch, Anna ; Krizek, Filip ; Kühn, Wolfgang ; Kugler, Andrej ; Kurepin, Alexei ; Lang, Simon Martin ; Lapidus, Kirill ; Liu, T. ; Maier, Ludwig W. ; Markert, Jochen ; Metag, Volker ; Michalska, Beata ; Morinière, Emilie ; Mousa, Jehad ; Münch, Mathias ; Münch, Christian ; Naumann, Lothar ; Otwinowski, Jacek Tomasz ; Pachmayer, Yvonne C. ; Pechenov, Vladimir ; Pechenova, Olga ; Pérez Cavalcanti, Tiago ; Pietraszko, Jerzy ; Pospısil, Vladimir ; Przygoda, Witold ; Ramstein, Béatrice ; Reshetin, Andrey ; Roy-Stephan, M. ; Rustamov, Anar ; Sadovsky, Alexander ; Sailer, Benjamin ; Salabura, Piotr ; Sánchez, M. ; Schmah, Alexander ; Schwab, Erwin ; Sobolev, Yuri G. ; Spataro, Stefano ; Spruck, Björn ; Ströbele, Herbert ; Stroth, Joachim ; Sturm, Christian Thomas ; Tarantola Peloni, Attilio ; Teilab, Khaled ; Tlustý, Pavel ; Toia, Alberica ; Traxler, Michael ; Trebacz, Radoslaw ; Tsertos, Haralabos ; Wagner, Vladimir ; Wisniowski, Marcin ; Wojcik, Tomasz ; Wüstenfeld, Jörn ; Yurevich, Sergey ; Zanevsky, Yuri V. ; Zumbruch, Peter W.
We present measurements of exclusive ensuremathπ+,0 and η production in pp reactions at 1.25GeV and 2.2GeV beam kinetic energy in hadron and dielectron channels. In the case of π+ and π0 , high-statistics invariant-mass and angular distributions are obtained within the HADES acceptance as well as acceptance-corrected distributions, which are compared to a resonance model. The sensitivity of the data to the yield and production angular distribution of Δ (1232) and higher-lying baryon resonances is shown, and an improved parameterization is proposed. The extracted cross-sections are of special interest in the case of pp → pp η , since controversial data exist at 2.0GeV; we find \ensuremathσ=0.142±0.022 mb. Using the dielectron channels, the π0 and η Dalitz decay signals are reconstructed with yields fully consistent with the hadronic channels. The electron invariant masses and acceptance-corrected helicity angle distributions are found in good agreement with model predictions.
Partial wave analysis of the reaction p(3.5 GeV) + p → pK +Λ to search for the "ppK−" bound state
(2015)
Agakishiev, Geydar ; Arnold, Oliver Werner ; Belver, Daniel ; Belyaev, A. ; Berger-Chen, Jia-Chii ; Blanco, Alberto ; Böhmer, Michael ; Boyard, Jean-Louis ; Cabanelas Eiras, Pablo ; Chernenko, Sergey P. ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Finocchiaro, Paolo ; Fonte, Paulo ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Göbel, Kathrin ; Golubeva, Marina ; González-Díaz, Diégo ; Guber, Fedor ; Gumberidze, Malgorzata ; Heinz, T. ; Hennino, Thierry ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Iori, Ileana ; Ivashkin, Alexander ; Jurkovič, Martin ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Koenig, Ilse ; Koenig, W. ; Kolb, Burkhard W. ; Kornakov, Georgy ; Kotte, Roland ; Krása, Antonin ; Krizek, Filip ; Krücken, Reiner ; Kuc, Hubert ; Kühn, Wolfgang ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexander ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Maier, Ludwig W. ; Mangiarotti, Alessio ; Markert, Jochen ; Metag, Volker ; Michel, Jan ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Pachmayer, Yvonne C. ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Pietraszko, Jerzy ; Przygoda, Witold ; Ramstein, Béatrice ; Reshetin, Andrey ; Rustamov, Anar ; Sadovsky, Alexander ; Salabura, Piotr ; Schmah, Alexander ; Schwab, Erwin ; Siebenson, Johannes Stephan ; Sobolev, Yuri G. ; Spataro, Stefano ; Spruck, Björn ; Ströbele, Herbert ; Stroth, Joachim ; Sturm, C. ; Tarantola Peloni, Attilio ; Teilab, Khaled ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Vasiliev, Taras A. ; Wagner, Vladimir ; Weber, Michael ; Wendisch, Christian ; Wüstenfeld, Jörn ; Yurevich, Sergey ; Zanevsky, Yuri V. ; Sarantsev, Andrei V.
Employing the Bonn–Gatchina partial wave analysis framework (PWA), we have analyzed HADES data of the reaction p(3.5 GeV) + p → pK +Λ. This reaction might contain information about the kaonic cluster “ppK −” (with quantum numbers J P = 0− and total isospin I = 1/2) via its decay into pΛ. Due to interference effects in our coherent description of the data, a hypothetical KNN (or, specifically “ppK −”) cluster signal need not necessarily show up as a pronounced feature (e.g. a peak) in an invariant mass spectrum like pΛ. Our PWA analysis includes a variety of resonant and non-resonant intermediate states and delivers a good description of our data (various angular distributions and two-hadron invariant mass spectra) without a contribution of a KNN cluster. At a confidence level of CLs = 95% such a cluster cannot contribute more than 2–12% to the total cross section with a pK +Λ final state, which translates into a production cross-section between 0.7 μb and 4.2 μb, respectively. The range of the upper limit depends on the assumed cluster mass, width and production process.
Adamczewski-Musch, Jörn ; Agakishiev, Geydar ; Arnold, Oliver Werner ; Atomssa, Ermias T. ; Behnke, Claudia ; Berger-Chen, Jia-Chii ; Biernat, Jacek ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey P. ; Deveaux, Christina Anna ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Gill, Katharina ; Golubeva, Marina ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Hennino, Thierry ; Hlaváč, Stanislav ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Jurkovič, Martin ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, W. ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Krása, Antonin ; Krebs, Erik ; Kuc, Hubert ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexander ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Mahmoud, Tariq ; Maier, Ludwig W. ; Maurus, Steffen ; Mangiarotti, Alessio ; Markert, Jochen ; Metag, Volker ; Michel, Jan ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Petousis, Vlasios ; Pietraszko, Jerzy ; Przygoda, Witold ; Ramos, S. ; Ramstein, Béatrice ; Rehnisch, Laura ; Reshetin, Andrey ; Rost, Adrian ; Rustamov, Anar ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schmidt-Sommerfeld, Korbinian ; Schuldes, Heidi ; Sellheim, Patrick ; Siebenson, Johannes Stephan ; Silva, L. ; Sobolev, Yuri G. ; Spataro, Stefano ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, C. ; Svoboda, Ondřej ; Tarantola Peloni, Attilio ; Teilab, Khaled ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Vasiliev, Taras A. ; Wagner, Vladimir ; Wendisch, Christian ; Wirth, Joana ; Wüstenfeld, Jörn ; Zanevsky, Yuri V. ; Zumbruch, Peter W.
The production of Σ0 baryons in the nuclear reaction p (3.5 GeV) + Nb (corresponding to sNN=3.18 GeV) is studied with the detector set-up HADES at GSI, Darmstadt. Σ0s were identified via the decay Σ0→Λγ with subsequent decays Λ→pπ− in coincidence with a e+e− pair from either external (γ→e+e−) or internal (Dalitz decay γ⁎→e+e−) gamma conversions. The differential Σ0 cross section integrated over the detector acceptance, i.e. the rapidity interval 0.5<y<1.1, has been extracted as ΔσΣ0=2.3±(0.2)stat±(−0.6+0.6)sys±(0.2)norm mb, yielding the inclusive production cross section in full phase space σΣ0total=5.8±(0.5)stat±(−1.4+1.4)sys±(0.6)norm±(1.7)extrapol mb by averaging over different extrapolation methods. The Λall/Σ0 ratio within the HADES acceptance is equal to 2.3±(0.2)stat±(−0.6+0.6)sys. The obtained rapidity and momentum distributions are compared to transport model calculations. The Σ0 yield agrees with the statistical model of particle production in nuclear reactions. Keywords: Hyperons, Strangeness, Proton, Nucleus.
Adamczewski-Musch, Jörn ; Arnold, Oliver Werner ; Behnke, Claudia ; Belounnas, Amel ; Belyaev, Alexei V. ; Berger-Chen, Jia-Chii ; Biernat, Jacek ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey P. ; Chlad, Lukáš ; Deveaux, Christina Anna ; Dreyer, Jörg ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Filip, Peter ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Golubeva, Marina ; Greifenhagen, Robert ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Heinz, Tobias ; Hennino, Thierry ; Hlaváč, Stanislav ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, Wolfgang ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexander ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Mahmoud, Tariq ; Maier, Ludwig W. ; Mangiarotti, Alessio ; Markert, Jochen ; Maurus, Steffen ; Metag, Volker ; Michel, Jan ; Mihaylov, Dimitar ; Morozov, Sergey ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Nowakowski, Krzysztof ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Petukhov, Oleg ; Pietraszko, Jerzy ; Przygoda, Witold ; Ramos, Sérgio ; Ramstein, Béatrice ; Reshetin, Andrey ; Rodriguez Ramos, Pablo ; Rosier, Philippe ; Rost, Adrian ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schuldes, Heidi ; Schwab, Erwin ; Scozzi, Federico ; Seck, Florian ; Sellheim, Patrick ; Selyuzhenkov, Ilya ; Siebenson, Johannes Stephan ; Silva, Luis ; Sobolev, Yuri G. ; Spataro, Stefano ; Spies, Simon ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, Christian Thomas ; Svoboda, Ondřej ; Szala, Melanie ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Usenko, Evgeny A. ; Wagner, Vladimir ; Wendisch, Christian ; Wiebusch, Michael ; Wirth, Joana ; Zanevsky, Yuri V. ; Zumbruch, Peter W. ; Leifels, Yvonne
We present first data on sub-threshold production of Ks0 mesons and Λ hyperons in Au+Au collisions at sNN=2.4 GeV. We observe an universal 〈Apart〉 scaling of hadrons containing strangeness, independent of their corresponding production thresholds. Comparing the yields, their 〈Apart〉 scaling, and the shapes of the rapidity and the pt spectra to state-of-the-art transport model (UrQMD, HSD, IQMD) predictions, we find that none of them can simultaneously describe these observables with reasonable χ2 values.
Adamczewski-Musch, Jörn ; Arnold, Oliver ; Behnke, Claudia ; Belounnas, Amel ; Belyaev, Alexander ; Berger-Chen, Jia-Chii ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey ; Chlad, Lukáš ; Ciepał, Izabela ; Deveaux, Christina Anna ; Dreyer, Jörn ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Filip, Peter ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Golubeva, Marina ; Greifenhagen, Robert ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Heinz, Torsten ; Hennino, Thierry ; Hlaváč, Stanislav ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, Wolfgang ; Kohls, Marvin ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kornas, Frédéric Julian ; Kotte, Roland ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexei ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexander ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Mahmoud, Tariq ; Maier, Ludwig W. ; Malige, Akshay ; Mangiarotti, Alessio ; Markert, Jochen ; Matulewicz, Tomasz ; Maurus, Steffen ; Metag, Volker ; Michel, Jan ; Mihaylov, Dimitar ; Morozov, Sergey ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Nowakowski, Krzysztof ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Petukhov, Oleg ; Piasecki, Krzysztof ; Pietraszko, Jerzy ; Przygoda, Witold ; Pysz, Krzysztof ; Ramos, Sérgio ; Ramstein, Béatrice ; Rathod, Narendra ; Reshetin, Andrey ; Rodríguez Ramos, Pablo ; Rosier, Philippe ; Rost, Adrian ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schuldes, Heidi ; Schwab, Erwin ; Scozzi, Federico ; Seck, Florian ; Sellheim, Patrick ; Selyuzhenkov, Ilya ; Siebenson, Johannes Stephan ; Silva, Luis ; Singh, U. ; Smyrski, Jerzy ; Sobolev, Yuri G. ; Spataro, Stefano ; Spies, Simon ; Ströbele, Herbert ; Stroth, Joachim ; Sturm, Christian ; Svoboda, Ondřej ; Szala, Melanie ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Usenko, Evgeny A. ; Wagner, Vladimir ; Wendisch, Christian ; Wiebusch, Michael ; Wirth, Joana ; Wójcik, Daniel Krzysztof ; Zanevsky, Yuri V. ; Zumbruch, Peter W.
In this letter we report the first multi-differential measurement of correlated pion-proton pairs from 2 billion Au+Au collisions at sNN=2.42 GeV collected with HADES. In this energy regime the population of Δ(1232) resonances plays an important role in the way energy is distributed between intrinsic excitation energy and kinetic energy of the hadrons in the fireball. The triple differential d3N/dMπ±pdpTdy distributions of correlated π±p pairs have been determined by subtracting the πp combinatorial background using an iterative method. The invariant-mass distributions in the Δ(1232) mass region show strong deviations from a Breit-Wigner function with vacuum width and mass. The yield of correlated pion-proton pairs exhibits a complex isospin, rapidity and transverse-momentum dependence. In the invariant mass range 1.1<Minv(GeV/c2)<1.4, the yield is found to be similar for π+p and π−p pairs, and to follow a power law 〈Apart〉α, where 〈Apart〉 is the mean number of participating nucleons. The exponent α depends strongly on the pair transverse momentum (pT) while its pT-integrated and charge-averaged value is α=1.5±0.08st±0.2sy.
Adamczewski-Musch, Jörn ; Arnold, Oliver Werner ; Behnke, Claudia ; Belounnas, Amel ; Belyaev, Alexei V. ; Berger-Chen, Jia-Chii ; Biernat, Jacek ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey P. ; Chlad, Lukáš ; Deveaux, Christina Anna ; Dreyer, Jörn ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Filip, Peter ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Golubeva, Marina ; Greifenhagen, Robert ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Heinz, Tobias ; Hennino, Thierry ; Hlaváč, Stanislav ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, Wolfgang ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexander ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Luis Alberto Vieira ; Lorenz, Manuel ; Mahmoud, Tariq ; Maier, Ludwig W. ; Mangiarotti, Alessio ; Markert, Jochen ; Matulewicz, Tomasz ; Maurus, Steffen ; Metag, Volker ; Michel, Jan ; Mihaylov, Dimitar ; Morozov, Sergey ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Nowakowski, K. ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Petukhov, Oleg ; Piasecki, Krzysztof ; Pietraszko, Jerzy ; Przygoda, Witold ; Ramos, Sérgio ; Ramstein, Béatrice ; Reshetin, Andrey ; Rodriguez Ramos, Pablo ; Rosier, Philippe ; Rost, Adrian ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schuldes, Heidi ; Schwab, Erwin ; Scozzi, Federico ; Seck, Florian ; Sellheim, Patrick ; Selyuzhenkov, Ilya ; Siebenson, Johannes Stephan ; Silva, Luis ; Sobolev, Yuri G. ; Spataro, Stefano ; Spies, Simon ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, Christian Thomas ; Svoboda, Ondřej ; Szala, Melanie ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Usenko, Evgeny A. ; Wagner, Vladimir ; Wendisch, Christian ; Wiebusch, Michael ; Wirth, Joana ; Wójcik, Daniel Krzysztof ; Zanevsky, Yuri V. ; Zumbruch, Peter W.
We investigate identical pion HBT intensity interferometry in central Au+Au collisions at 1.23A GeV. High-statistics π−π− and π+π+ data are measured with HADES at SIS18/GSI. The radius parameters, derived from the correlation function depending on relative momenta in the longitudinally comoving system and parametrized as three-dimensional Gaussian distribution, are studied as function of transverse momentum. A substantial charge-sign difference of the source radii is found, particularly pronounced at low transverse momentum. The extracted source parameters agree well with a smooth extrapolation of the center-of-mass energy dependence established at higher energies, extending the corresponding excitation functions down towards a very low energy.
Adamczewski-Musch, Jörn ; Arnold, Oliver Werner ; Behnke, Claudia ; Belounnas, Amel ; Belyaev, A. ; Berger-Chen, Jia-Chii ; Biernat, Jacek ; Blanco, Alberto ; Blume, Christoph ; Böhmer, Michael ; Bordalo, Paula ; Chernenko, Sergey P. ; Chlad, Lukáš ; Deveaux, Christina Anna ; Dreyer, J. ; Dybczak, Adrian ; Epple, Eliane ; Fabbietti, Laura ; Fateev, Oleg ; Filip, Peter ; Fonte, Paulo ; Franco, Celso ; Friese, Jürgen ; Fröhlich, Ingo ; Galatyuk, Tetyana ; Garzón, Juan A. ; Gernhäuser, Roman ; Golubeva, Marina ; Greifenhagen, Robert ; Guber, Fedor ; Gumberidze, Malgorzata ; Harabasz, Szymon ; Heinz, Tobias ; Hennino, Thierry ; Hlaváč, Stanislav ; Höhne, Claudia ; Holzmann, Romain ; Ierusalimov, Alexander P. ; Ivashkin, Alexander ; Kämpfer, Burkhard ; Karavicheva, Tatiana L. ; Kardan, Behruz ; Koenig, Ilse ; Koenig, W. ; Kolb, Burkhard W. ; Korcyl, Grzegorz ; Kornakov, Georgy ; Kotte, Roland ; Kühn, Wolfgang ; Kugler, Andrej ; Kunz, Tobias ; Kurepin, Alexander ; Kurilkin, Aleksey K. ; Kurilkin, Pavel ; Ladygin, Vladimir P. ; Lalik, Rafał Tomasz ; Lapidus, Kirill ; Lebedev, Alexei ; Lopes, Lourenco Vaz Gil ; Lorenz, Manuel ; Mahmoud, Tariq ; Maier, Ludwig W. ; Mangiarotti, Alessio ; Markert, Jochen ; Maurus, Steffen ; Metag, Volker ; Michel, Jan ; Mihaylov, Dimitar ; Morozov, Sergey ; Müntz, Christian ; Münzer, Robert Helmut ; Naumann, Lothar ; Nowakowski, K.N. ; Palka, Marek ; Parpottas, Yannis ; Pechenov, Vladimir ; Pechenova, Olga ; Petukhov, Oleg ; Pietraszko, Jerzy ; Przygoda, Witold ; Ramos, S. ; Ramstein, Béatrice ; Reshetin, Andrey ; Rodriguez Ramos, Pablo ; Rosier, Philippe ; Rost, Adrian ; Sadovsky, Alexander ; Salabura, Piotr ; Scheib, Timo ; Schuldes, Heidi ; Schwab, Erwin ; Scozzi, Federico ; Seck, Florian ; Sellheim, Patrick ; Siebenson, Johannes Stephan ; Silva, L. ; Sobolev, Yuri G. ; Spataro, Stefano ; Ströbele, Herbert ; Stroth, Joachim ; Strzempek, Paweł ; Sturm, Christian Thomas ; Svoboda, Ondřej ; Szala, Melanie ; Tlustý, Pavel ; Traxler, Michael ; Tsertos, Haralabos ; Usenko, Evgeny A. ; Wagner, Vladimir ; Wendisch, Christian ; Wiebusch, Michael ; Wirth, Joana ; Zanevsky, Yuri V. ; Zumbruch, Peter W.
We present data on charged kaons (K±) and ϕ mesons in Au(1.23A GeV)+Au collisions. It is the first simultaneous measurement of K− and ϕ mesons in central heavy-ion collisions below a kinetic beam energy of 10A GeV. The ϕ/K− multiplicity ratio is found to be surprisingly high with a value of 0.52±0.16 and shows no dependence on the centrality of the collision. Consequently, the different slopes of the K+ and K− transverse-mass spectra can be explained solely by feed-down, which substantially softens the spectra of K− mesons. Hence, in contrast to the commonly adapted argumentation in literature, the different slopes do not necessarily imply diverging freeze-out temperatures of K+ and K− mesons caused by different couplings to baryons.
Zamora Cardona, Juan Carlos ; Aumann, Thomas ; Bagchi, Soumya ; Bönig, Esther Sabine ; Csatlós, Margit ; Dillmann, Iris ; Dimopoulou, Christina ; Egelhof, Peter ; Eremin, Vladimir ; Furuno, Tatsuya ; Geissel, Hans ; Gernhäuser, Roman ; Harakeh, Muhsin N. ; Hartig, Anna-Lena ; Ilieva, Stoyanka ; Kalantar-Nayestanaki, Nasser ; Kiselev, Oleg A. ; Kollmus, Holger ; Kozhuharov, Christophor ; Krasznahorkay, Attila ; Kröll, Thorsten ; Kuilman, Maartje ; Litvinov, Sergey A. ; Litvinov, Yuri A. ; Mahjour-Shafiei, Masoud ; Mutterer, Manfred ; Nagae, Daisuke ; Najafi, Mohammad Ali ; Nociforo, Chiara ; Nolden, Fritz ; Popp, Ulrich ; Rigollet, Catherine ; Roy, Subhankar ; Scheidenberger, Christoph ; Schmid, Mirko von ; Steck, Markus ; Streicher, Branislav ; Stuhl, László ; Thürauf, Michael Friedrich Erhard ; Uesaka, Tomohiro ; Weick, Helmut ; Winfield, John S. ; Winters, Danyal Ferdinant Alexander ; Woods, Philip John ; Yamaguchi, Takayuki ; Yue, Ke ; Zenihiro, Juzo
A new technique developed for measuring nuclear reactions at low momentum transfer with stored beams in inverse kinematics was successfully used to study isoscalar giant resonances. The experiment was carried out at the experimental heavy-ion storage ring (ESR) at the GSI facility using a stored 58Ni beam at 100 MeV/u and an internal helium gas-jet target. In these measurements, inelastically scattered α-recoils at very forward center-of-mass angles (θcm ≤ 1.5°) were detected with a dedicated setup, including ultra-high vacuum compatible detectors. Experimental results indicate a dominant contribution of the isoscalar giant monopole resonance at this very forward angular range. It was found that the monopole contribution exhausts 79+12−11% of the energy-weighted sum rule (EWSR), which agrees with measurements performed in normal kinematics. This opens up the opportunity to investigate the giant resonances in a large domain of unstable and exotic nuclei in the near future. It is a fundamental milestone towards new nuclear reaction studies with stored ion beams.