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

L. Atar , S. 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. Casarejos , W. Catford , J. Cederkall , 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 (1) , 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 , M. Petri , S. Pietri , R. Plag , R. Reifarth , G. Ribeiro , C. Rigollet , D.M. Rossi , M. Röder , D. Savran , H. Scheit , H. Simon , O. Sorlin (2) , I. Syndikus , J.T. Taylor , O. Tengblad , R. Thies , Y. Togano , M. Vandebrouck (2) , 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

1 IPHC - Institut Pluridisciplinaire Hubert Curien
2 GANIL - Grand Accélérateur National d'Ions Lourds

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.

Domaines: Physique Nucléaire Théorique [nucl-th]

L. Atar, S. Paschalis, C. Barbieri, C.A. Bertulani, P. Díaz Fernández, et al.. Quasifree ($p$, $2p$) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength. Phys.Rev.Lett., 2018, 120 (5), pp.052501. ⟨10.1103/PhysRevLett.120.052501⟩. ⟨hal-01707581⟩