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Glorius, Jan ; Langer, Christoph ; Slavkovská, Zuzana ; Bott, Lukas ; Brandau, Carsten ; Brückner, Benjamin ; Blaum, Klaus ; Chen, Xiangchen ; Dababneh, Saed ; Davinson, Thomas ; Erbacher, Philipp ; Fiebiger, Stefan ; Gaßner, Tobias ; Göbel, Kathrin ; Groothuis, Mathias ; Gumberidze, Alexandre ; Gyürky, György ; Heil, Michael ; Heß, Regina ; Hensch, Roman ; Hillmann, Paula ; Hillenbrand, Pierre-Michel ; Hinrichs, Ole Djürko ; Jurado Apruzzese, Beatriz ; Kausch, Tanja ; Khodaparast, Anahita ; Kisselbach, Timo ; Klapper, Nadine ; Kozhuharov, Christophor ; Kurtulgil, Cem Deniz ; Lane, Gregory J. ; Lederer-Woods, Claudia ; Lestinsky, Michael ; Litvinov, Sergey A. ; Litvinov, Yuri A. ; Löher, Bastian ; Nolden, Fritz ; Petridis, Nikolaos ; Popp, Ulrich ; Rauscher, Thomas ; Reed, Matthew ; Reifarth, René ; Sanjari, Mohammad Shahab ; Savran, Deniz ; Simon, Haik ; Spillmann, Uwe ; Steck, Markus ; Stöhlker, Thomas ; Stumm, Julia ; Surzhykov, Andrey ; Szücs, Tamas ; Nguyen, Thien Tam ; Taremi Zadeh, Ashkan ; Thomas, Benedikt ; Torilov, Sergey Yu. ; Törnqvist, Hans Toshihide ; Träger, Michael ; Trageser, Christian ; Trotsenko, Sergiy ; Varga, László ; Volknandt, Meiko ; Weick, Helmut ; Weigand, Mario ; Wolf, Clemens ; Woods, Philip John ; Xing, Yuan Ming
We report the first measurement of low-energy proton-capture cross sections of 124Xe in a heavy-ion storage ring. 124Xe54+ ions of five different beam energies between 5.5 and 8 AMeV were stored to collide with a windowless hydrogen target. The 125Cs reaction products were directly detected. The interaction energies are located on the high energy tail of the Gamow window for hot, explosive scenarios such as supernovae and x-ray binaries. The results serve as an important test of predicted astrophysical reaction rates in this mass range. Good agreement in the prediction of the astrophysically important proton width at low energy is found, with only a 30% difference between measurement and theory. Larger deviations are found above the neutron emission threshold, where also neutron and γ widths significantly impact the cross sections. The newly established experimental method is a very powerful tool to investigate nuclear reactions on rare ion beams at low center-of-mass energies.
Boretzky, Konstanze ; Gašparić, Igor ; Heil, Michael ; Mayer, Jan ; Heinz, Andreas ; Caesar, Christoph ; Kresan, Dmytro ; Simon, Haik ; Törnqvist, Hans Toshihide ; Körper, Daniel ; Alkhazov, G. D. ; Atar, Leyla ; Aumann, Thomas ; Bemmerer, Daniel ; Bondarev, S. V. ; Bott, Lukas T. ; Chakraborty, Santosh ; Cherciu, Madalin I. ; Chulkov, Leonid V. ; Ciobanu, Mircea ; Datta, Ushasi ; De Filippo, Enrico ; Douma, Christiaan ; Dreyer, Jörn ; Elekes, Zoltán ; Enders, Joachim ; Galaviz Redondo, Daniel ; Geraci, Elena Irene ; Gnoffo, Brunilde ; Göbel, Kathrin ; Golovtsov, Victor L. ; González-Díaz, Diégo ; Gruzinsky, N. ; Heftrich, Tanja ; Heggen, Henning ; Hehner, Jörg ; Hensel, Thomas ; Hoemann, Elena ; Holl, Matthias ; Horvat, Andrea ; Horváth, Ákos ; Ickert, Günter ; Jelavić-Malenica, Deša ; Johansson, Håkan T. ; Jonson, Björn ; Kahlbow, Julian ; Kalantar-Nayestanaki, Nasser ; Kelić-Heil, Aleksandra ; Mathias, Kempe ; Koch, Karsten ; Kozlenko, Nikolai ; Krivshich, Anatoly G. ; Kurz, Nikolaus ; Kouznetsov, Viacheslav A. ; Langer, Christoph ; Leifels, Yvonne ; Lihtar, Ivana ; Löher, Bastian ; Machado, Jorge ; Martorana, Nunzia Simona ; Miki, Kenjiro ; Nilsson, Thomas ; Orischin, E. M. ; Pagano, Emanuele Vincenzo ; Pirrone, Sara ; Politi, Giuseppe ; Potlog, Petru-Mihai ; Rahaman, Anisur ; Reifarth, René ; Rigollet, Catherine ; Röder, Marko ; Rossi, Dominic M. ; Russotto, Paolo ; Savran, Deniz ; Scheit, Heiko ; Schindler, Fabia ; Stach, Daniel ; Stan, Emil ; Stomvall Gill, J. ; Teubig, Pamela ; Trimarchi, Marina ; Uvarov, Lev ; Volknandt, Meiko ; Volkov, S. ; Wagner, Andreas ; Wagner, Vladimír ; Wranne, Staffan ; Yakorev, Dmitry ; Zanetti, Lorenzo ; Zilges, Andreas ; Zuber, Kai
NeuLAND (New Large-Area Neutron Detector) is the next-generation neutron detector for the R3B (Reactions with Relativistic Radioactive Beams) experiment at FAIR (Facility for Antiproton and Ion Research). NeuLAND detects neutrons with energies from 100 to 1000 MeV, featuring a high detection efficiency, a high spatial and time resolution, and a large multi-neutron reconstruction efficiency. This is achieved by a highly granular design of organic scintillators: 3000 individual submodules with a size of 5 × 5 × 250 cm3 are arranged in 30 double planes with 100 submodules each, providing an active area of 250 × 250 cm2 and a total depth of 3 m. The spatial resolution due to the granularity together with a time resolution of 150 ps ensures high-resolution capabilities. In conjunction with calorimetric properties, a multi-neutron reconstruction efficiency of 50% to 70% for four-neutron events will be achieved, depending on both the emission scenario and the boundary conditions allowed for the reconstruction method. We present in this paper the final design of the detector as well as results from test measurements and simulations on which this design is based.
Atar, Leyla ; Paschalis, Stefanos ; Barbieri, Carlo ; Bertulani, Carlos A. ; Díaz Fernández, Paloma ; Holl, Matthias ; Najafi, Mohammad Ali ; Panin, Valerii ; Alvarez-Pol, Héctor ; Aumann, Thomas ; Avdeichikov, Vladimir ; Beceiro-Novo, Saul ; Bemmerer, Daniel ; Benlliure Anaya, Jose Fernando ; Boillos Betete, Juan Manuel ; Boretzky, Konstanze ; Garcia Borge, Maria José ; Caamaño, Manuel ; Caesar, Christoph ; Casarejos Ruiz, Enrique ; Catford, Wilton N. ; Cederkäll, Joakim ; Chartier, Marielle ; Chulkov, Leonid V. ; Cortina Gil, Dolores ; Cravo, Edgar ; Crespo, Raquel ; Dillmann, Iris ; Elekes, Zoltán ; Enders, Joachim ; Ershova, Olga ; Estradé Vaz, Alfredo ; Farinon, Fabio ; Fraile Prieto, Luis Mario ; Freer, Martin ; Galaviz Redondo, Daniel ; Geissel, Hans ; Gernhäuser, Roman ; Golubev, Pavel ; Göbel, Kathrin ; Hagdahl, Julius ; Heftrich, Tanja ; Heil, Michael ; Heine, Marcel ; Heinz, Andreas ; Henriques, Ana ; Hufnagel, Alexander ; Ignatov, Alexander ; Johansson, Håkan T. ; Jonson, Björn ; Kahlbow, Julian ; Kalantar-Nayestanaki, Nasser ; Kanungo, Rituparna ; Kelic-Heil, Aleksandra ; Knyazev, Alexander ; Kröll, Thorsten ; Kurz, Nikolaus ; Labiche, Marc ; Langer, Christoph ; Le Bleis, Tudi ; Lemmon, Roy Crawford ; Lindberg, Simon ; Machado, Jorge ; Marganiec-Gałązka, J. ; Movsesyan, Alina ; Nácher González, Enrique ; Nikolskii, Evgenii Y. ; Nilsson, Thomas ; Nociforo, Chiara ; Perea Martinez, Angel ; Petri, Marina ; Pietri, Stephane ; Plag, Ralf ; Reifarth, René ; Ribeiro Jimenez, Guillermo ; Rigollet, Catherine ; Rossi, Dominic M. ; Röder, Marko ; Savran, Deniz ; Scheit, Heiko ; Simon, Haik ; Sorlin, Olivier ; Syndikus, Ina ; Taylor, Jonathan Thomas ; Tengblad, Olof ; Thies, Ronja ; Togano, Yasuhiro ; Vandebrouck, Marine ; Velho, Paulo ; Volkov, Vasily ; Wagner, Andreas ; Wamers, Felix ; Weick, Helmut ; Wheldon, Carl ; Wilson, Gemma Louise ; Winfield, John S. ; Woods, Philip John ; Yakorev, Dmitry ; Zhukov, Mikhail V. ; Zilges, Andreas ; Zuber, Kai
Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the R3B/LAND setup with incident beam energies in the range of 300–450 MeV/u. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type AO(p,2p)A−1N have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.