Article,
New insight into knockout reactions from the two-proton halo nucleus 17Ne
Affiliations
- [1] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany [NORA names: Germany; Europe, EU; OECD];
- [2] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany [NORA names: Germany; Europe, EU; OECD];
- [3] Tech Univ, Inst Kernphys, D-64289 Darmstadt, Germany [NORA names: Germany; Europe, EU; OECD];
- [4] Natl Ctr Nucl Res, Radioisotope Ctr POLATOM POLATOM, Andrzeja Soltana 7, PL-05400 Otwock, Poland [NORA names: Poland; Europe, EU; OECD];
- [5] King Saud Univ, Coll Sci, Phys & Astron Dept, Riyadh 12372, Saudi Arabia [NORA names: Saudi Arabia; Asia, Middle East];
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Abstract
Background: The unexplained disagreement in the dependence of spectroscopic factors ( C 2 S exp ) on the binding energy obtained by nucleon knockout using different targets is still a puzzle that needs to be addressed. Purpose: To find an explanation of this riddle through exclusive measurements using different targets. Method: The exclusive measurements were performed by using a 17 Ne beam with an energy of 500 MeV / u incident on C and 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 Ne as well as from its core 15 O. Result: For the C target, proton ejection from the proton halo gave C 2 S exp about 37% smaller than for the H target. But when protons are ejected from the core of 17 Ne, C 2 S exp are identical within statistical uncertainties. Conclusion: 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 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.