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Quasi-free one-nucleon knockout reactions on neutron-rich oxygen isotopes

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  • for the R3B-collaboration


Publication details

JournalProceedings of Science
DatePublished - 1 Jan 2016
Original languageEnglish


According to the Independent Particle Model (IPM) the single particle states are fully occupied with a spectroscopic factor one. However in electron-induced proton knockout reactions a reduction of single-particle strengths has been observed to about 60-70% for stable nuclei in comparison to the IPM. This finding has confirmed by nuclear knockout reactions using stable and exotic beams, however, with a strong dependency on the proton-neutron asymmetry. To understand this dependency quantitatively a complementary approach, quasi-free reactions, is introduced. Quasi-free knockout reactions in inverse kinematics at relativistic energies allows us to investigate single-particle structure of stable and exotic nuclei in a most direct way. We have performed a systematic study of spectroscopic strength of oxygen isotopes using quasi-free (p,2p) and (p,pn) knockout reactions in complete kinematic at the R3B/LAND setup (at GSI in Darmstadt, Germany) with secondary beams containing 13−24O. The oxygen isotopic chain offers a large variation of separation energies, which allow us to obtain a quantitative understanding of spectroscopic factors with respect to isospin asymmetry. The16−18O and21−23O isotopes have been analyzed so far and the preliminary results will be presented. The results include cross sections, momentum distributions and gamma-coincidence measurements. By comparison with the eikonal reaction theory the spectroscopic and reduction factors have been extracted and will be compared to existing data.

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