Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Structure and Dynamics of Nuclei I

HK 5.1: Gruppenbericht

Montag, 14. März 2016, 14:00–14:30, S1/01 A03

Quasi-free one nucleon knockout reactions on neutron-rich Oxygen Isotopes at the R3B-LAND setup — •Leyla Atar^1,2, Thomas Aumann^1,2, Carlos Bertulani³, Stefanos Paschalis¹, and Chiara Nociforo² for the R3B collaboration — ¹TU Darmstadt, Darmstadt, Germany — ²GSI, Darmstadt, Germany — ³Texas A&M University-Commerce, Commerse, USA

Recent experiments have showed a reduction of spectroscopic strengths of about 60-70% for stable nuclei. When going to driplines this tendency is changing, loosely bound nucleons have spectroscopic strengths close unity while deeply bound nucleons have a large reduction of the strength. We aim to make a systematic study of spectroscopic factors (SF) of the Oxygen isotopes using quasi-free (p,2p) and (p,pn) knockout reactions in inverse kinematics. Quasi-free knockout reactions are a direct tool to study the occupancy and the location of valance and deeply bound single particle states. The Oxygen isotopes offer a large variation of separation energies which will allow us to obtain a qualitative and quantitative understanding of SF in a large variation of isospin asymmetry. For this we performed an experiment at the R3B-LAND setup at the GSI with a secondary beam ¹⁴⁻²⁴O. The ¹⁶⁻¹⁸O and ²¹⁻²³O isotopes have been analyzed and the preliminary results will be presented. The results include the partial cross sections, gamma ray spectra of the residual fragments in coincidence, and the SF obtained via comparison with theory. This work is supported by HIC for FAIR, GSI-TU Darmstadt cooperation, and the BMBF project 05P15RDFN1.