Quasi-Free Scattering from Relativistic Neutron-Deficient Carbon Isotopes

by Matthias Holl (Technische Universität Darmstadt)

Wednesday 21 Jan 2015, 14:30 → 15:30 Europe/Zurich

26-1-022 (CERN)

Single nucleon knockout and quasi-free scattering reactions are valuable tools to study single-particle properties of nuclei [1]. Particularly, it has been argued, that they can be used to study spectroscopic factors on an absolute scale [2]. Quenching of these spectroscopic factors as compared to shell-model predictions has been observed in nuclear knockout reactions [3]. While for stable isotopes these findings are in agreement with results obtained in quasi-free electron scattering [1,4], a surprisingly large dependancy of this quenching on the neutron-proton asymmetry has been observed, motivating further studies using quasi-free proton scattering. 

Quasi-free scattering from the neutron-deficient carbon isotopes 10C and 11C has been studied in inverse kinematics during experiment S393 at GSI. A 40Ar beam, accelerated to 490AMeV by the SIS18 heavy ion synchrotron, was incident on a production target at the entrance of the fragment separator FRS, and the resulting cocktail beam including 10C and 11C was then transported to the R3B-LAND setup. Here, the incoming beam as well as all reaction products were detected in a kinematically complete measurement. 

Results for cross sections, spectroscopic factors and momentum distributions will be shown and compared to results obtained for knockout reactions as well as DWIA-calculations. Furthermore, excitation spectra of the reaction products will be discussed.

[1] G. Jacob and Th. A. J. Maris Rev. Mod. Phys. 38 (1966) 121
[2] B. A. Brown et al., Phys. Rev. C 65 (2002) 061601
[3] A. Gade et al., Phys. Rev. C 77 (2008) 044306
[4] G. J. Kramer, H. P. Blok, and L. Lapikas, Nucl. Phys. A 679 (2001) 267 

Supported by the State of Hesse (LOEWE Centre HIC for FAIR), and through the GSI-TU Darmstadt cooperation agreement.