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

for the R3B-collaboration

Research output: Contribution to journalConference articlepeer-review


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.

Original languageEnglish
JournalProceedings of Science
Publication statusPublished - 1 Jan 2016
Event54th International Winter Meeting on Nuclear Physics, BORMIO 2016 - Bormio, Italy
Duration: 25 Jan 201629 Jan 2016

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