Quasifree (p, 2p) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength

Leyla Atar, Stefanos Paschalis, C. Barbieri, C. A. Bertulani, P. Díaz Fernández, M. Holl, M.A Najafi, V. Panin, H. Alvarez-Pol, T. Aumann, V. Avdeichikov, S. Beceiro-Novo, D. Bemmerer, J. Benlliure, J.M. Boillos, K. Boretzky, M. J. G. Borge, M. Caamaño, C. Caesar, E. CasarejosW. Catford, J. Cederkäll, M. Chartier, L. Chulkov, D. Cortina-Gil, E. Cravo, R. Crespo, I. Dillmann, Z. Elekes, J. Enders, O. Ershova, A. Estrade, F. Farinon, L.M Fraile, M. Freer, D. Galaviz Redondo, H. Geissel, R. Gernhäuser, P. Golubev, K. Göbel, J. Hagdahl, T. Heftrich, M. Heil, M. Heine, A. Heinz, A. Henriques, A. Hufnagel, A. Ignatov, H.T Johansson, B Jonson, J. Kahlbow, N. Kalantar-Nayestanaki, R. Kanungo, A. Kelic-Heil, A. Knyazev, T. Kröll, N. Kurz, M. Labiche, C. Langer, T. Le Bleis, R. Lemmon, S. Lindberg, J. Machado, J. Marganiec-Gałązka, A. Movsesyan, E. Nacher, E.Y. Nikolskii, T. Nilsson, C. Nociforo, A. Perea, Marina Petri, S. Pietri, R. Plag, R. Reifarth, G. Ribeiro, C. Rigollet, D.M. Rossi, M. Röder, D. Savran, H. Scheit, H. Simon, O. Sorlin, I. Syndikus, J. T. Taylor, O Tengblad, R. Thies, Y. Togano, M. Vandebrouck, P. Velho, V. Volkov, A. Wagner, F. Wamers, H. Weick, C. Wheldon, G.L. Wilson, J.S. Winfield, P. Woods, D. Yakorev, M. Zhukov, A. Zilges, K Zuber

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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 OA(p,2p)NA-1 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.

Original languageEnglish
Article number052501
Number of pages7
JournalPhysical Review Letters
Issue number5
Early online date29 Jan 2018
Publication statusPublished - 2 Feb 2018

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