Diverse mechanisms in proton knockout reactions from the Borromean nucleus 17Ne

F. Wamers, C. Lehr, J. Marganiec-Gałązka, F. Aksouh, Yu Aksyutina, H. Alvarez-Pol, L. Atar, T. Aumann, S. Beceiro-Novo, C. A. Bertulani, K. Boretzky, M. J.G. Borge, C. Caesar, M. Chartier, A. Chatillon, L. V. Chulkov, D. Cortina-Gil, P. Díaz Fernández, H. Emling, O. ErshovaL. M. Fraile, H. O.U. Fynbo, D. Galaviz, H. Geissel, M. Heil, M. Holl, H. T. Johansson, B. Jonson*, C. Karagiannis, O. A. Kiselev, R. Kulessa, N. Kurz, C. Langer, M. Lantz, T. Le Bleis, R. Lemmon, Yu A. Litvinov, K. Mahata, C. Müntz, T. Nilsson, C. Nociforo, W. Ott, V. Panin, S. Paschalis, A. Perea, R. Plag, R. Reifarth, A. Richter, K. Riisager, C. Rodriguez-Tajes, D. Rossi, D. Savran, H. Scheit, G. Schrieder, P. Schrock, H. Simon, J. Stroth, K. Sümmerer, O. Tengblad, H. Weick, C. Wimmer

*Corresponding author for this work

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Nucleon knockout experiments using beryllium or carbon targets reveal a strong dependence of the quenching factors, i.e., the ratio (R s) of theoretical to the experimental spectroscopic factors (C 2S), on the proton-neutron asymmetry in the nucleus under study. However, this dependence is greatly reduced when a hydrogen target is used. To understand this phenomenon, exclusive 1H (17Ne , 2p16F) and inclusive 12C(17Ne,2p16F)X , 12C (17Ne , 16F) X as well as 1H (17Ne , 16F) X (X-denotes undetected reaction products) reactions with 16F in the ground and excited states were analysed. The longitudinal momentum distribution of 16F and the correlations between the detached protons were studied. In the case of the carbon target, there is a significant deviation from the predictions of the eikonal model. The eikonal approximation was used to extract spectroscopic factor values C 2S . The experimental C 2S value obtained with C target is markedly lower than that for H target. This is interpreted as rescattering due to simultaneous nucleon knockout from both reaction partners, 17Ne and 12C .

Original languageEnglish
Article number154
Number of pages7
JournalEuropean Physical Journal A
Issue number7
Publication statusPublished - 12 Jul 2023

Bibliographical note

Funding Information:
This work is supported by the German Federal Ministry for Education and Research (BMBF) under contract No.05P15RDFN1, the ExtreMe Matter Institute (EMMI), HIC for FAIR, and the GSI-TU Darmstadt cooperation agreement. Financial support from the Swe- dish Research Council, from the Spanish grants from MICINN AEI FPA2017 - 87568 - P, PGC2018 - 0099746 - B - C21, FPA2015-64969-P, PID2019-104390GB-100, RTI2018-098868-B-100, and Maria de Maeztu Units of excellence MDM-2016-0692 are also acknowledged. One of us (B.J.) is a Helmholtz International Fellow. C.A.B. acknowledges support from the U.S. DOE grant DE-FG02-08ER41533.

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© 2023, The Author(s).

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