TY - JOUR
T1 - Quasi-free one-nucleon knockout reactions on neutron-rich oxygen isotopes
AU - for the R3B-collaboration
AU - Atar, Leyla
AU - Paschalis, Stefanos
AU - Aumann, Thomas
AU - Bertulani, Carlos
PY - 2016/1/1
Y1 - 2016/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85053485183&partnerID=8YFLogxK
M3 - Conference article
SN - 1824-8039
JO - Proceedings of Science
JF - Proceedings of Science
T2 - 54th International Winter Meeting on Nuclear Physics, BORMIO 2016
Y2 - 25 January 2016 through 29 January 2016
ER -