New insight into knockout reactions from the two-proton halo nucleus ${}^{17}\mathrm{Ne}$

Journal Article · 02 May 2024 · Physical Review. C

DOI: https://doi.org/10.1103/PhysRevC.109.054602 · OSTI ID:2345805

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

The unexplained disagreement in the dependence of spectroscopic factors $\left(C^2{S}_{\exp }\right)$ on the binding energy obtained by nucleon knockout using different targets is still a puzzle that needs to be addressed. To find an explanation of this riddle through exclusive measurements using different targets. The exclusive measurements were performed by using a ${}^{17}\mathrm{Ne}$ beam with an energy of 500 MeV/u incident on $\mathrm{C}$ and ${\mathrm{CH}}_2$ targets. Through the standard theoretical approach, $C^2{S}_{\exp }$ were derived from the analysis of the experimental data on proton ejection from the proton halo in ${}^{17}\mathrm{Ne}$ as well as from its core ${}^{15}\mathrm{O}$ . For the $\mathrm{C}$ target, proton ejection from the proton halo gave $C^2{S}_{\exp }$ about 37% smaller than for the $\mathrm{H}$ target. But when protons are ejected from the core of ${}^{17}\mathrm{Ne}$ , $C^2{S}_{\exp }$ are identical within statistical uncertainties. An explanation for the difference in $C^2{S}_{\exp }$ could be the removal of both halo protons, a more important reaction pathway for the $\mathrm{C}$ target. The $C^2{S}_{\exp }$ values obtained by analyzing the proton ejection from the core indicate that it is not affected by the interaction with the halo protons. Published by the American Physical Society 2024

• Sponsoring Organization: USDOE
• Grant/Contract Number: FG02-08ER41533
• OSTI ID: 2345805
• Journal Information: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 5 Vol. 109; ISSN PRVCAN; ISSN 2469-9985
• Publisher: American Physical SocietyCopyright Statement
• Country of Publication: United States
• Language: English